Run the Play job on trixie for fastlane's Ruby 3.2 requirement (#509)

- Queued drops: moves made while an earlier one is still saving are queued instead of dropped, with messages for stale and skipped moves (#494)
- Day view title names the month (#501)
- Dependency updates: kotlinx-datetime, AppCompat, fastlane, Renovate image (#507–#510)
- Version 2.24.2 (2240299), CHANGELOG, What's New in all store locales

#494 stays open until the reporter answers; the fix covers the ways a quick move could get lost, the original report isn't reproduced.

Refs #494
Closes #501

.gitea/workflows/release.yaml

@@ -318,13 +318,16 @@ jobs:
   # not provide node inside custom job containers, so JavaScript actions
   # (checkout, download-artifact) can't run there. The Renovate job gets away
   # with a container because its only step is a shell command. Ruby is installed
-  # the same way sshpass, jq and fdroidserver are in the job above.
+  # the same way sshpass, jq and fdroidserver are in the job above, from trixie:
+  # fastlane >= 2.241 needs Ruby 3.2+, and bookworm's apt only has 3.1.
   play:
     needs: [detect, release]
     # workflow_dispatch is the F-Droid re-sign recovery path — it must never
     # touch Play, so gate on a real release only.
     if: needs.detect.outputs.is_release == 'true'
     runs-on: docker
+    container:
+      image: node:22-trixie
     env:
       VERSION: ${{ needs.detect.outputs.version }}
       VERSION_CODE: ${{ needs.detect.outputs.version_code }}

app/src/main/java/de/jeanlucmakiola/calendula/data/prefs/CalendarPrefs.kt

@@ -81,7 +81,7 @@ class CalendarPrefs @Inject constructor(
 }
 
 /** A comma-joined id set; non-numeric tokens are dropped, and an empty set removes the key. */
-internal fun idSetPref(name: String): Pref<Set<Long>> = nullableStringPref(name).map(
+private fun idSetPref(name: String): Pref<Set<Long>> = nullableStringPref(name).map(
     { stored -> stored.orEmpty().split(',').mapNotNull { it.trim().toLongOrNull() }.toSet() },
     { ids -> if (ids.isEmpty()) null else ids.sorted().joinToString(",") },
 )

app/src/main/java/de/jeanlucmakiola/calendula/data/prefs/SettingsPrefs.kt

@@ -166,9 +166,6 @@ class SettingsPrefs @Inject constructor(
     val defaultEventDurationMinutes: Flow<Int> = prefs.flow(SettingsKeys.defaultEventDurationMinutes)
     val perCalendarEventDuration: Flow<Map<Long, Int>> = prefs.flow(SettingsKeys.perCalendarEventDuration)
     val remindersEnabled: Flow<Boolean> = prefs.flow(SettingsKeys.remindersEnabled)
-    val mutedReminderCalendarIds: Flow<Set<Long>> = prefs.flow(SettingsKeys.mutedReminderCalendarIds)
-    val notificationCategoryHintDismissed: Flow<Boolean> = prefs.flow(SettingsKeys.notificationCategoryHintDismissed)
-    val reminderChannelVersions: Flow<Map<Long, Int>> = prefs.flow(SettingsKeys.reminderChannelVersions)
     val allowColorOnUnsupportedCalendars: Flow<Boolean> =
         prefs.flow(SettingsKeys.allowColorOnUnsupportedCalendars)
     val defaultReminderMinutes: Flow<List<Int>> = prefs.flow(SettingsKeys.defaultReminderMinutes)
@@ -276,25 +273,6 @@ class SettingsPrefs @Inject constructor(
 
     suspend fun setRemindersEnabled(enabled: Boolean) = prefs.set(SettingsKeys.remindersEnabled, enabled)
 
-    /**
-     * Reserve a new reminder channel version for each calendar in [floors], above
-     * both its stored high-water mark and its floor, and return them. Versions
-     * only grow: the system would restore a deleted channel's old settings if
-     * its id came back (#518).
-     */
-    suspend fun reserveReminderChannelVersions(floors: Map<Long, Int>): Map<Long, Int> {
-        val stored = prefs.update(SettingsKeys.reminderChannelVersions) { current ->
-            current + floors.mapValues { (id, floor) -> maxOf((current[id] ?: 0) + 1, floor) }
-        }
-        return floors.keys.associateWith { stored.getValue(it) }
-    }
-
-    suspend fun dismissNotificationCategoryHint() = prefs.set(SettingsKeys.notificationCategoryHintDismissed, true)
-
-    suspend fun setCalendarRemindersEnabled(calendarId: Long, enabled: Boolean) {
-        prefs.update(SettingsKeys.mutedReminderCalendarIds) { if (enabled) it - calendarId else it + calendarId }
-    }
-
     suspend fun setAllowColorOnUnsupportedCalendars(enabled: Boolean) =
         prefs.set(SettingsKeys.allowColorOnUnsupportedCalendars, enabled)
 
@@ -616,27 +594,6 @@ object SettingsKeys {
      */
     val remindersEnabled: Pref<Boolean> = booleanPref("reminders_enabled", true)
 
-    /**
-     * Calendars whose reminders Calendula doesn't post (#272), independent of
-     * `Calendars.VISIBLE`: the events still show, only the notifications stop.
-     */
-    val mutedReminderCalendarIds: Pref<Set<Long>> = idSetPref("muted_reminder_calendar_ids")
-
-    /**
-     * Whether the one-time hint that some skins (Samsung) start new notification
-     * categories switched off has been dismissed (#145).
-     */
-    val notificationCategoryHintDismissed: Pref<Boolean> = booleanPref("notification_category_hint_dismissed", false)
-
-    /**
-     * The highest reminder channel version handed out per calendar (#518): a
-     * sound picked in the app recreates the channel under a new one. The
-     * channels themselves say which version is current; this only keeps ids
-     * from being reused. Serialised as `id=version;id=version`.
-     */
-    val reminderChannelVersions: Pref<Map<Long, Int>> =
-        nullableStringPref("reminder_channel_versions").map(::parseChannelVersions) { it.toStoredVersions() }
-
     /**
      * Whether to offer a custom event colour on calendars that publish no colour
      * palette; synced ones without a palette (some CalDAV) may drop or overwrite
@@ -1020,18 +977,6 @@ private fun parseDurationOverrides(stored: String?): Map<Long, Int> =
         calendarId to minutes
     }.toMap()
 
-private fun parseChannelVersions(stored: String?): Map<Long, Int> =
-    stored?.split(ENTRY_SEP).orEmpty().mapNotNull { entry ->
-        val parts = entry.split(KEY_VALUE_SEP)
-        if (parts.size != 2) return@mapNotNull null
-        val calendarId = parts[0].trim().toLongOrNull() ?: return@mapNotNull null
-        val version = parts[1].trim().toIntOrNull()?.takeIf { it > 0 } ?: return@mapNotNull null
-        calendarId to version
-    }.toMap()
-
-private fun Map<Long, Int>.toStoredVersions(): String? =
-    if (isEmpty()) null else entries.sortedBy { it.key }.joinToString(ENTRY_SEP) { (id, v) -> "$id$KEY_VALUE_SEP$v" }
-
 private fun Map<Long, Int>.toStoredDurations(): String =
     entries.sortedBy { it.key }.joinToString(ENTRY_SEP) { (id, minutes) ->
         "$id$KEY_VALUE_SEP$minutes"

app/src/main/java/de/jeanlucmakiola/calendula/data/reminders/ReminderChannelPlan.kt

@@ -1,201 +0,0 @@
-package de.jeanlucmakiola.calendula.data.reminders
-
-import de.jeanlucmakiola.calendula.domain.CalendarSource
-import de.jeanlucmakiola.calendula.ui.common.groupByAccount
-
-/** The single channel every reminder posted on before they moved per calendar (#145). */
-const val LEGACY_REMINDER_CHANNEL_ID = "reminders"
-
-private const val CHANNEL_PREFIX = "reminders.calendar."
-private const val GROUP_PREFIX = "reminders.account."
-private const val LOCAL_GROUP_ID = GROUP_PREFIX + "local"
-
-private const val VERSION_SEPARATOR = ".v"
-
-/**
- * The notification channel [calendarId]'s reminders post on. A sound picked in
- * the app moves it to a new [version] (#518), since a channel's sound is fixed
- * once created; version 0 is the unversioned id #145 introduced.
- */
-fun reminderChannelId(calendarId: Long, version: Int = 0): String =
-    if (version == 0) "$CHANNEL_PREFIX$calendarId" else "$CHANNEL_PREFIX$calendarId$VERSION_SEPARATOR$version"
-
-/** The calendar and version a reminder channel id names, or null for any other id. */
-fun parseReminderChannelId(channelId: String): Pair<Long, Int>? {
-    if (!isReminderChannelId(channelId)) return null
-    val rest = channelId.removePrefix(CHANNEL_PREFIX)
-    val calendar = rest.substringBefore(VERSION_SEPARATOR).toLongOrNull() ?: return null
-    if (VERSION_SEPARATOR !in rest) return calendar to 0
-    val version = rest.substringAfter(VERSION_SEPARATOR).toIntOrNull()?.takeIf { it > 0 } ?: return null
-    return calendar to version
-}
-
-/**
- * Each calendar's current channel version: the highest one that exists, so a
- * new version only takes over once it is written. A calendar with none falls
- * back to its [highWater] mark — re-creating that id restores its own settings.
- */
-fun currentReminderChannelVersions(existingChannelIds: Collection<String>, highWater: Map<Long, Int>): Map<Long, Int> {
-    val existing = existingChannelIds.mapNotNull(::parseReminderChannelId)
-        .groupBy({ it.first }, { it.second })
-        .mapValues { (_, versions) -> versions.max() }
-    return highWater + existing
-}
-
-/** Whether [channelId] is one of the per-calendar reminder channels. */
-fun isReminderChannelId(channelId: String): Boolean = channelId.startsWith(CHANNEL_PREFIX)
-
-/** Whether [groupId] is one of the per-account reminder channel groups. */
-fun isReminderGroupId(groupId: String): Boolean = groupId.startsWith(GROUP_PREFIX)
-
-/**
- * One account's channel group, labelled as the calendar manager labels it. The
- * app's own device calendars share a single group ([isLocal]); [ambiguous]
- * marks a [label] another group shows too, so it should name the source app.
- */
-data class ReminderChannelGroupSpec(
-    val id: String,
-    val label: String,
-    val accountType: String,
-    val isLocal: Boolean,
-    val ambiguous: Boolean,
-)
-
-data class ReminderChannelSpec(
-    val id: String,
-    val calendarId: Long,
-    val name: String,
-    /** Null only for a channel created before its calendar could be looked up. */
-    val groupId: String?,
-    /**
-     * Whether a sync creates it up front. A calendar that syncs no events never
-     * fires, so its channel only appears once something posts on it.
-     */
-    val upFront: Boolean = true,
-)
-
-/** What a channel already looks like in the system, as far as the plan compares it. */
-data class ExistingReminderChannel(val id: String, val name: String, val description: String?, val groupId: String?)
-
-data class ReminderChannelPlan(
-    val groups: List<ReminderChannelGroupSpec>,
-    val channels: List<ReminderChannelSpec>,
-    /**
-     * The [channels] a sync writes: missing up-front ones, and existing ones
-     * whose name or (localized) description changed, or that still lack a group.
-     */
-    val channelsToWrite: List<ReminderChannelSpec>,
-    /** The [groups] holding a channel that exists or is about to be written. */
-    val groupsInUse: List<ReminderChannelGroupSpec>,
-    val staleChannelIds: List<String>,
-    val staleGroupIds: List<String>,
-    /** Stale channels kept for now, because a notification on them is still showing. */
-    val keptChannelIds: List<String> = emptyList(),
-)
-
-/**
- * What the reminder channels should look like for [calendars]: one channel per
- * calendar inside a group per account, which of them need writing, and the
- * reminder channels and groups in [existing] / [existingGroupIds] no calendar
- * claims any more. Ids outside the reminder namespace (the backup channel, the
- * legacy channel) are never touched.
- */
-fun planReminderChannels(
-    calendars: List<CalendarSource>,
-    existing: Collection<ExistingReminderChannel>,
-    existingGroupIds: Collection<String>,
-    unnamed: String,
-    description: String,
-    versions: Map<Long, Int> = emptyMap(),
-    showingChannelIds: Set<String> = emptySet(),
-): ReminderChannelPlan {
-    val (local, synced) = calendars.partition { it.isLocal }
-    val groups = buildList {
-        if (local.isNotEmpty()) {
-            add(ReminderChannelGroupSpec(LOCAL_GROUP_ID, "", local.first().accountType, isLocal = true, ambiguous = false))
-        }
-        synced.groupByAccount().forEach { group ->
-            add(
-                ReminderChannelGroupSpec(
-                    id = accountGroupId(group.key.type, group.key.name),
-                    label = group.label,
-                    accountType = group.accountType,
-                    isLocal = false,
-                    ambiguous = group.ambiguous,
-                ),
-            )
-        }
-    }
-    val existingById = existing.associateBy { it.id }
-    val channels = calendars.map { calendar ->
-        ReminderChannelSpec(
-            id = reminderChannelId(calendar.id, versions[calendar.id] ?: 0),
-            calendarId = calendar.id,
-            name = calendar.displayName.ifBlank { unnamed },
-            groupId = if (calendar.isLocal) LOCAL_GROUP_ID else accountGroupId(calendar.accountType, calendar.accountName),
-            upFront = calendar.isLocal || calendar.syncsEvents,
-        )
-    }
-    val wantedChannels = channels.mapTo(HashSet()) { it.id }
-    val wantedGroups = groups.mapTo(HashSet()) { it.id }
-    val toWrite = channels.filter { spec ->
-        val current = existingById[spec.id]
-        if (current == null) {
-            spec.upFront
-        } else {
-            current.name != spec.name || current.description != description ||
-                (current.groupId == null && spec.groupId != null)
-        }
-    }
-    val usedGroupIds = channels
-        .filter { it.id in existingById || it in toWrite }
-        .mapNotNullTo(HashSet()) { it.groupId }
-    val (kept, stale) = existingById.keys
-        .filter { isReminderChannelId(it) && it !in wantedChannels }
-        .partition { it in showingChannelIds }
-    val keptGroups = kept.mapNotNullTo(HashSet()) { existingById.getValue(it).groupId }
-    return ReminderChannelPlan(
-        groups = groups,
-        channels = channels,
-        channelsToWrite = toWrite,
-        groupsInUse = groups.filter { it.id in usedGroupIds },
-        staleChannelIds = stale,
-        staleGroupIds = existingGroupIds.filter { isReminderGroupId(it) && it !in wantedGroups && it !in keptGroups },
-        keptChannelIds = kept,
-    )
-}
-
-private fun accountGroupId(type: String, name: String): String = "$GROUP_PREFIX$type/$name"
-
-/** A channel as far as its blocked state goes: switched off itself, and the group it sits in. */
-data class ReminderChannelState(val blocked: Boolean, val groupId: String?)
-
-/** Reminder notifications the system blocks, while Calendula would post them. */
-data class ReminderChannelStatus(
-    val appBlocked: Boolean = false,
-    val blockedCalendarIds: Set<Long> = emptySet(),
-    /** The blocked ones whose whole account group is off, which only the app's own screen can undo. */
-    val groupBlockedCalendarIds: Set<Long> = emptySet(),
-)
-
-/**
- * What the system blocks of [calendarIds]' reminders: all of them while the
- * app's notifications are off, otherwise those whose channel, or the group it
- * sits in, is switched off. A calendar without a channel yet isn't blocked.
- */
-fun reminderChannelStatus(
-    calendarIds: Collection<Long>,
-    appEnabled: Boolean,
-    channels: Map<String, ReminderChannelState>,
-    blockedGroupIds: Set<String>,
-    versions: Map<Long, Int> = emptyMap(),
-): ReminderChannelStatus {
-    fun channel(calendarId: Long) = channels[reminderChannelId(calendarId, versions[calendarId] ?: 0)]
-    val groupBlocked = calendarIds.filterTo(HashSet()) { channel(it)?.groupId in blockedGroupIds }
-    val blocked = if (!appEnabled) {
-        calendarIds.toSet()
-    } else {
-        calendarIds.filterTo(HashSet()) { channel(it)?.blocked == true } + groupBlocked
-    }
-    return ReminderChannelStatus(appBlocked = !appEnabled, blockedCalendarIds = blocked, groupBlockedCalendarIds = groupBlocked)
-}

app/src/main/java/de/jeanlucmakiola/calendula/data/reminders/ReminderChannels.kt

@@ -1,353 +0,0 @@
-package de.jeanlucmakiola.calendula.data.reminders
-
-import android.app.Notification
-import android.app.NotificationChannel
-import android.app.NotificationChannelGroup
-import android.app.NotificationManager
-import android.app.NotificationManager.IMPORTANCE_DEFAULT
-import android.app.NotificationManager.IMPORTANCE_LOW
-import android.app.NotificationManager.IMPORTANCE_MIN
-import android.content.Context
-import android.media.AudioAttributes
-import android.net.Uri
-import android.util.Log
-import dagger.hilt.android.qualifiers.ApplicationContext
-import de.jeanlucmakiola.calendula.R
-import de.jeanlucmakiola.calendula.data.calendar.CalendarDataSource
-import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
-import de.jeanlucmakiola.calendula.domain.CalendarSource
-import de.jeanlucmakiola.calendula.ui.common.sourceAppLabel
-import kotlinx.coroutines.flow.first
-import kotlinx.coroutines.runBlocking
-import java.util.Locale
-import javax.inject.Inject
-import javax.inject.Singleton
-
-/**
- * The reminder notification channels: one per calendar, grouped by account
- * (#145), created up front so each calendar can be muted or given its own sound
- * in the system settings before it ever fires.
- *
- * A channel the user has touched keeps their settings; [sync] only creates the
- * missing ones, renames changed ones, and deletes those whose calendar is gone.
- * A sound picked in the app ([setSound], #518) recreates the channel under the
- * calendar's next version; the old one goes once nothing shows on it.
- */
-@Singleton
-class ReminderChannels @Inject constructor(
-    @ApplicationContext private val context: Context,
-    private val calendarDataSource: CalendarDataSource,
-    private val settingsPrefs: SettingsPrefs,
-) {
-    private val manager: NotificationManager
-        get() = context.getSystemService(NotificationManager::class.java)
-
-    /** What the last [sync] saw, so an unchanged provider costs no channel writes. */
-    @Volatile
-    private var lastSync: Any? = null
-
-    /**
-     * Bring the channels in line with the provider's calendars. An empty
-     * snapshot changes nothing: that is a provider hiccup far more often than
-     * every calendar gone at once.
-     */
-    @Synchronized
-    fun sync() {
-        val calendars = calendarDataSource.calendars()
-        if (calendars.isEmpty()) return
-        val manager = manager
-        val existing = manager.notificationChannels
-        val existingIds = existing.mapTo(HashSet()) { it.id }
-        val versions = currentVersions(existingIds).also { knownVersions = it }
-        if (syncKey(calendars, existingIds, versions) == lastSync && LEGACY_REMINDER_CHANNEL_ID !in existingIds) return
-        val groups = manager.notificationChannelGroups
-        val groupIds = groups.map { it.id }
-        // Active notifications are only read when there is something stale to protect.
-        val plan = plan(calendars, existing, groupIds, versions).let { draft ->
-            if (draft.staleChannelIds.isEmpty()) draft else plan(calendars, existing, groupIds, versions, showingChannelIds(draft.staleChannelIds))
-        }
-        plan.staleChannelIds.forEach(manager::deleteNotificationChannel)
-        plan.staleGroupIds.forEach(manager::deleteNotificationChannelGroup)
-        val groupNames = groups.associate { it.id to it.name?.toString() }
-        write(
-            groups = plan.groupsInUse.filter { groupNames[it.id] != groupLabel(it) },
-            channels = plan.channelsToWrite,
-            existing = existing,
-        )
-        val ids = existingIds - plan.staleChannelIds.toSet() + plan.channelsToWrite.map { it.id }
-        val legacyGone = retireLegacyChannel()
-        // A kept channel still has to go once its notification does, so don't cache.
-        lastSync = if (plan.keptChannelIds.isEmpty()) {
-            syncKey(calendars, if (legacyGone) ids - LEGACY_REMINDER_CHANNEL_ID else ids, versions)
-        } else {
-            null
-        }
-    }
-
-    private fun syncKey(calendars: List<CalendarSource>, channelIds: Set<String>, versions: Map<Long, Int>): Any = listOf(
-        calendars.map { listOf(it.id, it.displayName, it.accountName, it.accountType, it.isLocal, it.syncsEvents) },
-        Locale.getDefault(),
-        channelIds,
-        versions,
-    )
-
-    /**
-     * The current versions last resolved under the lock ([sync], [channelFor]).
-     * Only [recreate], under the same lock, moves a calendar higher and updates
-     * it, so a hit whose channel still exists is current.
-     */
-    @Volatile
-    private var knownVersions: Map<Long, Int> = emptyMap()
-
-    private fun currentVersions(existingChannelIds: Collection<String>): Map<Long, Int> =
-        currentReminderChannelVersions(existingChannelIds, runBlocking { settingsPrefs.reminderChannelVersions.first() })
-
-    /** Channels with a notification on screen; on failure all of [candidates] count, so none is deleted. */
-    private fun showingChannelIds(candidates: Collection<String>): Set<String> = runCatching {
-        manager.activeNotifications.mapNotNullTo(HashSet()) { it.notification.channelId }
-    }.getOrElse { e ->
-        Log.w(TAG, "Could not read active notifications", e)
-        candidates.toSet()
-    }
-
-    /**
-     * The channel to post [calendarId]'s reminder on, created first if a sync
-     * has not got to it yet. Null when the calendar no longer exists. Should the
-     * calendar lookup fail or come back empty, the channel is still created,
-     * plainly named and ungrouped, for the next sync to name and file — a
-     * reminder is never lost to its channel.
-     */
-    @Synchronized
-    fun channelFor(calendarId: Long): String? {
-        val manager = manager
-        knownVersions[calendarId]?.let { version ->
-            val known = reminderChannelId(calendarId, version)
-            if (manager.getNotificationChannel(known) != null) return known
-        }
-        val existing = manager.notificationChannels
-        val versions = currentVersions(existing.map { it.id }).also { knownVersions = it }
-        val id = reminderChannelId(calendarId, versions[calendarId] ?: 0)
-        if (existing.any { it.id == id }) return id
-        val calendars = try {
-            calendarDataSource.calendars()
-        } catch (e: Exception) {
-            Log.w(TAG, "Could not look up calendar $calendarId for its channel", e)
-            emptyList()
-        }
-        val fallback = ReminderChannelSpec(id, calendarId, context.getString(R.string.reminder_channel_name), null)
-        if (calendars.isEmpty()) {
-            write(emptyList(), listOf(fallback), existing)
-            return id
-        }
-        val plan = plan(calendars, existing, emptyList(), versions)
-        val spec = plan.channels.firstOrNull { it.calendarId == calendarId } ?: return null
-        try {
-            val knownGroups = manager.notificationChannelGroups.mapTo(HashSet()) { it.id }
-            write(
-                groups = plan.groups.filter { it.id == spec.groupId && it.id !in knownGroups },
-                channels = listOf(spec),
-                existing = existing,
-            )
-        } catch (e: RuntimeException) {
-            Log.w(TAG, "Could not file the channel of calendar $calendarId", e)
-            write(emptyList(), listOf(fallback), existing)
-        }
-        return id
-    }
-
-    /**
-     * Run [block] with [calendarId]'s channel held: no sound pick or sync can
-     * move or retire it until [block] returns. Null, without running [block],
-     * when the calendar is gone or its channel can't be made; [block]'s own
-     * failures propagate.
-     */
-    @Synchronized
-    fun <T> withChannel(calendarId: Long, block: (String) -> T): T? {
-        val channelId = try {
-            channelFor(calendarId)
-        } catch (e: Exception) {
-            Log.w(TAG, "No channel for calendar $calendarId", e)
-            null
-        }
-        return channelId?.let(block)
-    }
-
-    /** What the system currently lets through for [calendarIds]' reminders (#145). */
-    fun status(calendarIds: Collection<Long>): ReminderChannelStatus {
-        val manager = manager
-        val appEnabled = manager.areNotificationsEnabled()
-        val existing = manager.notificationChannels
-        val channels = existing.associate {
-            it.id to ReminderChannelState(it.importance == NotificationManager.IMPORTANCE_NONE, it.group)
-        }
-        val blockedGroups = manager.notificationChannelGroups.filter { it.isBlocked }.mapTo(HashSet()) { it.id }
-        return reminderChannelStatus(calendarIds, appEnabled, channels, blockedGroups, currentVersions(channels.keys))
-    }
-
-    /** A "Silent" (low) channel keeps its sound but never plays it. */
-    private fun NotificationChannel.audibleSound(): Uri? =
-        sound.takeUnless { importance in IMPORTANCE_MIN..IMPORTANCE_LOW }
-
-    /**
-     * The sound each of [calendarIds]' channels plays; null is silent. A
-     * calendar whose channel doesn't exist yet is left out.
-     */
-    fun sounds(calendarIds: Collection<Long>): Map<Long, Uri?> {
-        val byId = manager.notificationChannels.associateBy { it.id }
-        val versions = currentVersions(byId.keys)
-        return calendarIds.mapNotNull { id ->
-            byId[reminderChannelId(id, versions[id] ?: 0)]?.let { id to it.audibleSound() }
-        }.toMap()
-    }
-
-    /**
-     * Give [calendarIds]' reminders [sound] (null = silent). A channel's sound is
-     * fixed once created, so each moves to a new channel version carrying over
-     * everything else, and the old one retires on the next sync (#518). Calendars without a
-     * channel are skipped unless [createMissing]. Returns whether every move
-     * went through.
-     */
-    suspend fun setSound(calendarIds: Collection<Long>, sound: Uri?, createMissing: Boolean): Boolean {
-        if (createMissing) calendarIds.forEach(::channelFor)
-        val existingIds = manager.notificationChannels.mapTo(HashSet()) { it.id }
-        val current = currentVersions(existingIds)
-        val floors = calendarIds
-            .filter { reminderChannelId(it, current[it] ?: 0) in existingIds }
-            .associateWith { (current[it] ?: 0) + 1 }
-        if (floors.isEmpty()) return false
-        return recreate(settingsPrefs.reserveReminderChannelVersions(floors), sound)
-    }
-
-    /**
-     * Create each calendar's [versions] from its current channel. The old one is
-     * left to the next [sync], which retires it once nothing shows on it.
-     */
-    @Synchronized
-    private fun recreate(versions: Map<Long, Int>, sound: Uri?): Boolean {
-        val manager = manager
-        val byId = manager.notificationChannels.associateBy { it.id }
-        val current = currentReminderChannelVersions(byId.keys, emptyMap())
-        var allApplied = true
-        versions.forEach { (calendarId, version) ->
-            val from = current[calendarId]?.takeIf { it < version }
-            val old = from?.let { byId[reminderChannelId(calendarId, it)] }
-            if (old == null) {
-                allApplied = false
-                return@forEach
-            }
-            try {
-                // Picking a sound asks for one, which a "Silent" (low) channel would never play.
-                val importance = if (sound != null && old.importance in IMPORTANCE_MIN..IMPORTANCE_LOW) {
-                    IMPORTANCE_DEFAULT
-                } else {
-                    old.importance
-                }
-                manager.createNotificationChannel(
-                    NotificationChannel(reminderChannelId(calendarId, version), old.name, importance).apply {
-                        description = old.description
-                        old.group?.let { group = it }
-                        inheritFrom(old)
-                        setSound(sound, old.audioAttributes ?: DEFAULT_AUDIO_ATTRIBUTES)
-                    },
-                )
-                knownVersions = knownVersions + (calendarId to version)
-            } catch (e: RuntimeException) {
-                Log.w(TAG, "Could not move calendar $calendarId to a new sound", e)
-                allApplied = false
-            }
-        }
-        lastSync = null
-        return allApplied
-    }
-
-    private fun plan(
-        calendars: List<CalendarSource>,
-        existing: List<NotificationChannel>,
-        existingGroupIds: List<String>,
-        versions: Map<Long, Int>,
-        showingChannelIds: Set<String> = emptySet(),
-    ): ReminderChannelPlan = planReminderChannels(
-        calendars = calendars,
-        existing = existing.map { ExistingReminderChannel(it.id, it.name.toString(), it.description, it.group) },
-        existingGroupIds = existingGroupIds,
-        unnamed = context.getString(R.string.calendar_unnamed),
-        description = context.getString(R.string.reminder_channel_description),
-        versions = versions,
-        showingChannelIds = showingChannelIds,
-    )
-
-    private fun write(
-        groups: List<ReminderChannelGroupSpec>,
-        channels: List<ReminderChannelSpec>,
-        existing: List<NotificationChannel>,
-    ) {
-        val manager = manager
-        if (groups.isNotEmpty()) {
-            manager.createNotificationChannelGroups(groups.map { NotificationChannelGroup(it.id, groupLabel(it)) })
-        }
-        if (channels.isEmpty()) return
-        val byId = existing.associateBy { it.id }
-        val description = context.getString(R.string.reminder_channel_description)
-        val template = byId[LEGACY_REMINDER_CHANNEL_ID]
-        // Importance only applies on creation; an existing channel keeps its own.
-        manager.createNotificationChannels(
-            channels.map { spec ->
-                val current = byId[spec.id]
-                NotificationChannel(
-                    spec.id,
-                    spec.name,
-                    current?.importance ?: template?.importance ?: NotificationManager.IMPORTANCE_HIGH,
-                ).apply {
-                    this.description = description
-                    spec.groupId?.let { group = it }
-                    if (current == null && template != null) inheritFrom(template)
-                }
-            },
-        )
-    }
-
-    /**
-     * Carry a channel's sound, vibration, lights and badge over to a new one: the
-     * legacy channel to a per-calendar one on upgrade, or a calendar's channel to
-     * its next version (#518). Lock-screen visibility and a DND override can't
-     * follow: the system resets both on channels an app creates.
-     */
-    private fun NotificationChannel.inheritFrom(template: NotificationChannel) {
-        setSound(template.sound, template.audioAttributes)
-        // The pattern setter also flips vibration on or off, so it goes first.
-        vibrationPattern = template.vibrationPattern
-        enableVibration(template.shouldVibrate())
-        enableLights(template.shouldShowLights())
-        lightColor = template.lightColor
-        setShowBadge(template.canShowBadge())
-        // Only honoured with Do Not Disturb access, so usually left to the user.
-        setBypassDnd(template.canBypassDnd())
-    }
-
-    /**
-     * Delete the pre-#145 channel once the per-calendar ones carry its settings,
-     * but not while a reminder posted on it is still on screen — deleting the
-     * channel would take that notification with it. Returns whether it is gone.
-     */
-    private fun retireLegacyChannel(): Boolean {
-        val manager = manager
-        if (manager.getNotificationChannel(LEGACY_REMINDER_CHANNEL_ID) == null) return true
-        val showing = LEGACY_REMINDER_CHANNEL_ID in showingChannelIds(listOf(LEGACY_REMINDER_CHANNEL_ID))
-        if (!showing) manager.deleteNotificationChannel(LEGACY_REMINDER_CHANNEL_ID)
-        return !showing
-    }
-
-    private fun groupLabel(group: ReminderChannelGroupSpec): String {
-        if (group.isLocal) return context.getString(R.string.calendars_local_header)
-        val name = group.label.ifBlank { context.getString(R.string.calendar_unnamed) }
-        if (!group.ambiguous) return name
-        return context.getString(R.string.calendars_account_from_source, name, sourceAppLabel(context, group.accountType))
-    }
-
-    private companion object {
-        const val TAG = "ReminderChannels"
-
-        val DEFAULT_AUDIO_ATTRIBUTES: AudioAttributes = Notification.AUDIO_ATTRIBUTES_DEFAULT
-    }
-}
-

app/src/main/java/de/jeanlucmakiola/calendula/data/reminders/ReminderNotifier.kt

@@ -1,6 +1,8 @@
 package de.jeanlucmakiola.calendula.data.reminders
 
 import android.Manifest
+import android.app.NotificationChannel
+import android.app.NotificationManager
 import android.app.PendingIntent
 import android.content.Context
 import android.os.Build
@@ -27,8 +29,8 @@ import javax.inject.Inject
 import javax.inject.Singleton
 
 /**
- * Posts one notification per occurrence on its calendar's channel
- * ([ReminderChannels], #145). Tapping opens the event's detail screen.
+ * Posts one notification per occurrence on a dedicated channel. Tapping opens
+ * the event's detail screen.
  *
  * The tag is the [occurrenceKey], so each reminder for an occurrence replaces
  * the one before it in place (#463). A different reminder alerts afresh; the
@@ -41,7 +43,6 @@ class ReminderNotifier @Inject constructor(
     private val settingsPrefs: SettingsPrefs,
     private val calendarPrefs: CalendarPrefs,
     private val calendarDataSource: CalendarDataSource,
-    private val channels: ReminderChannels,
 ) {
 
     /** False when the user declined `POST_NOTIFICATIONS` or muted the app. */
@@ -52,19 +53,19 @@ class ReminderNotifier @Inject constructor(
     }
 
     /**
-     * The single choke point for "this calendar posts no reminders": switched
-     * off (also covering a snooze armed before the switch-off, and a read-only
-     * install whose switch lives in [CalendarPrefs]), or its notifications
-     * turned off in Calendula's own settings (#272).
+     * The single choke point for "this calendar is switched off", covering the
+     * two paths that reach [post] around the scan's own filter: a snooze armed
+     * before the switch-off, and a read-only install whose switch lives in
+     * [CalendarPrefs].
      */
     private suspend fun isSilenced(calendarId: Long): Boolean =
-        calendarId in settingsPrefs.mutedReminderCalendarIds.first() ||
-            calendarId in calendarPrefs.pendingDisabledCalendarIds.first() ||
+        calendarId in calendarPrefs.pendingDisabledCalendarIds.first() ||
             calendarDataSource.isCalendarVisible(calendarId) == false
 
-    /** Post [alert], unless its calendar is silenced or gone. */
+    /** Post [alert], unless its calendar is switched off. */
     suspend fun post(alert: ReminderAlert) {
         if (isSilenced(alert.calendarId)) return
+        ensureChannel()
         val title = displayTitle(alert)
         val is24Hour = settingsPrefs.timeFormat.first()
             .is24Hour(android.text.format.DateFormat.is24HourFormat(context))
@@ -87,15 +88,7 @@ class ReminderNotifier @Inject constructor(
             yesterdayLabel = context.getString(R.string.reminder_day_yesterday),
         )
         val text = listOfNotNull(time, alert.location).joinToString(" · ")
-        // Under the channel lock, so a sound picked meanwhile (#518) can't move it mid-post.
-        val posted = channels.withChannel(alert.calendarId) { channelId -> notify(alert, channelId, title, text) }
-        if (posted == null) {
-            Log.i(TAG, "Dropped the reminder of event ${alert.eventId}: no channel for calendar ${alert.calendarId}")
-        }
-    }
-
-    private fun notify(alert: ReminderAlert, channelId: String, title: String, text: String) {
-        val notification = NotificationCompat.Builder(context, channelId)
+        val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(R.drawable.ic_notification)
             .setContentTitle(title)
             .setContentText(text)
@@ -160,7 +153,7 @@ class ReminderNotifier @Inject constructor(
     private fun cancelLegacy(alert: ReminderAlert) {
         val manager = NotificationManagerCompat.from(context)
         manager.activeNotifications
-            .filter { it.id == NOTIFICATION_ID && it.notification.channelId == LEGACY_REMINDER_CHANNEL_ID }
+            .filter { it.id == NOTIFICATION_ID && it.notification.channelId == CHANNEL_ID }
             .filter { !it.notification.extras.containsKey(EXTRA_REMINDER_KEY) }
             .filter { it.notification.`when` == alert.beginMillis }
             .filter { it.notification.extras.getCharSequence(NotificationCompat.EXTRA_TITLE)?.toString() == displayTitle(alert) }
@@ -188,8 +181,21 @@ class ReminderNotifier @Inject constructor(
         PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE,
     )
 
+    /** Channel creation is idempotent; re-running refreshes the localized name. */
+    private fun ensureChannel() {
+        val channel = NotificationChannel(
+            CHANNEL_ID,
+            context.getString(R.string.reminder_channel_name),
+            NotificationManager.IMPORTANCE_HIGH,
+        ).apply {
+            description = context.getString(R.string.reminder_channel_description)
+        }
+        NotificationManagerCompat.from(context).createNotificationChannel(channel)
+    }
+
     private companion object {
         const val TAG = "ReminderNotifier"
+        const val CHANNEL_ID = "reminders"
 
         // One id, distinct tags: the tag (occurrence) already keys the
         // notification, so a fixed id keeps cancellation/replacement simple.

app/src/main/java/de/jeanlucmakiola/calendula/data/reminders/ReminderScanner.kt

@@ -43,7 +43,6 @@ class ReminderScanner @Inject constructor(
     private val source: ReminderInstanceSource,
     private val calendarDataSource: CalendarDataSource,
     private val notifier: ReminderNotifier,
-    private val channels: ReminderChannels,
     private val snoozes: ReminderSnoozeScheduler,
     private val alarms: ReminderAlarmScheduler,
     private val state: ReminderStatePrefs,
@@ -86,14 +85,10 @@ class ReminderScanner @Inject constructor(
             return
         }
 
-        syncChannels()
         val lookahead = reminderQueryHorizon(LOOKAHEAD_MILLIS, source.longestReminderMinutes())
         // Reach into the past too: an all-day "at time of event" encodes to a
         // negative offset, and a catch-up pass needs the occurrences it missed.
-        // Calendars muted in-app (#272) plan nothing, so they arm no wake-ups.
-        val muted = settingsPrefs.mutedReminderCalendarIds.first()
         val occurrences = source.occurrences(now - PAST_WINDOW_MILLIS, now + lookahead)
-            .filter { it.calendarId !in muted }
         val planned = planReminders(
             instances = occurrences,
             minutesByEvent = source.reminderMinutes(occurrences.map { it.eventId })
@@ -122,19 +117,6 @@ class ReminderScanner @Inject constructor(
         alarms.scheduleScan(schedule.nextAlarmMillis)
     }
 
-    /**
-     * A provider change re-scans, so a calendar added, renamed or removed keeps
-     * its channel in step here. Skipped while reminders are off, when the
-     * channels have nothing to do. A failure never costs the reminders.
-     */
-    private fun syncChannels() {
-        try {
-            channels.sync()
-        } catch (e: Exception) {
-            Log.w(TAG, "Reminder channel sync failed", e)
-        }
-    }
-
     private fun hasReadCalendar(): Boolean = context.hasPermission(Manifest.permission.READ_CALENDAR)
 
     /**

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/AccountGroups.kt

@@ -1,6 +1,5 @@
 package de.jeanlucmakiola.calendula.ui.common
 
-import android.content.Context
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
 import androidx.compose.ui.platform.LocalContext
@@ -73,13 +72,11 @@ fun accountGroupTitle(group: CalendarAccountGroup): String {
 @Composable
 fun sourceAppName(accountType: String): String {
     val context = LocalContext.current
-    return remember(accountType) { sourceAppLabel(context, accountType) }
-}
-
-/** [sourceAppName] outside composition, e.g. for notification channel groups. */
-fun sourceAppLabel(context: Context, accountType: String): String {
-    val pm = context.packageManager
-    return sourceAppPackages(context, accountType).firstNotNullOfOrNull { pkg ->
-        runCatching { pm.getApplicationLabel(pm.getApplicationInfo(pkg, 0)).toString() }.getOrNull()
-    } ?: accountType
+    return remember(accountType) {
+        val pm = context.packageManager
+        val packages = sourceAppPackages(context, accountType)
+        packages.firstNotNullOfOrNull { pkg ->
+            runCatching { pm.getApplicationLabel(pm.getApplicationInfo(pkg, 0)).toString() }.getOrNull()
+        } ?: accountType
+    }
 }

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/NotificationSettings.kt

@@ -6,35 +6,22 @@ import android.content.Intent
 import android.os.Build
 import android.os.PowerManager
 import android.provider.Settings
-import android.provider.Settings.System.DEFAULT_NOTIFICATION_URI
-import android.widget.Toast
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.animation.AnimatedVisibility
-import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.KeyboardArrowRight
-import androidx.compose.material.icons.automirrored.filled.OpenInNew
-import androidx.compose.material.icons.outlined.Info
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Text
-import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
-import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
-import androidx.compose.runtime.rememberCoroutineScope
-import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
-import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
@@ -42,11 +29,8 @@ import androidx.compose.ui.unit.dp
 import androidx.core.net.toUri
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleEventObserver
-import androidx.lifecycle.compose.LifecycleResumeEffect
 import androidx.lifecycle.compose.LocalLifecycleOwner
-import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import de.jeanlucmakiola.calendula.R
-import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.ui.common.CalendarColorChip
 import de.jeanlucmakiola.calendula.ui.common.DurationPicker
 import de.jeanlucmakiola.calendula.ui.common.REMINDER_PRESETS
@@ -55,14 +39,10 @@ import de.jeanlucmakiola.calendula.ui.common.TimePickerAlert
 import de.jeanlucmakiola.calendula.ui.common.durationLabel
 import de.jeanlucmakiola.calendula.ui.common.orUnnamed
 import de.jeanlucmakiola.floret.android.hasPermission
-import de.jeanlucmakiola.floret.android.notificationSoundPickerIntent
-import de.jeanlucmakiola.floret.android.openNotificationSettings
-import de.jeanlucmakiola.floret.android.pickedSound
 import de.jeanlucmakiola.floret.components.CollapsingScaffold
 import de.jeanlucmakiola.floret.components.ExpandIcon
 import de.jeanlucmakiola.floret.components.GroupedRow
 import de.jeanlucmakiola.floret.components.GroupedSwitchRow
-import de.jeanlucmakiola.floret.components.IconInfoCard
 import de.jeanlucmakiola.floret.components.Position
 import de.jeanlucmakiola.floret.components.SelectedCheck
 import de.jeanlucmakiola.floret.identity.collapseExit
@@ -70,7 +50,6 @@ import de.jeanlucmakiola.floret.identity.expandEnter
 import de.jeanlucmakiola.floret.reminders.ReminderOverride
 import de.jeanlucmakiola.floret.reminders.minutesOrEmpty
 import de.jeanlucmakiola.floret.reminders.reminderOverrideFor
-import kotlinx.coroutines.launch
 import kotlinx.datetime.LocalTime
 
 /**
@@ -107,63 +86,6 @@ internal fun NotificationsScreen(
     var overrideDialog by remember { mutableStateOf<OverrideTarget?>(null) }
     var calendarSectionExpanded by remember { mutableStateOf(false) }
     var expandedCalendars by remember { mutableStateOf(emptySet<Long>()) }
-    val scope = rememberCoroutineScope()
-    val channelStatus by viewModel.channelStatus.collectAsStateWithLifecycle()
-    val calendarIds = state.reminderCalendars.map { it.id }
-    LifecycleResumeEffect(calendarIds) {
-        viewModel.refreshChannelStatus(calendarIds)
-        onPauseOrDispose { }
-    }
-    val openCalendarSettings: (Long) -> Unit = { calendarId ->
-        scope.launch { context.openNotificationSettings(viewModel.soundSettingsChannel(calendarId)) }
-    }
-    val openAppSettings: () -> Unit = {
-        scope.launch {
-            viewModel.syncReminderChannels()
-            context.openNotificationSettings()
-        }
-    }
-    val loadedSounds by viewModel.channelSounds.collectAsStateWithLifecycle()
-    val sounds = loadedSounds.orEmpty()
-    val soundFailedMessage = stringResource(R.string.settings_notification_sound_failed)
-    val soundUnreadableMessage = stringResource(R.string.settings_notification_sound_unreadable)
-    LaunchedEffect(Unit) {
-        viewModel.soundFailed.collect { failure ->
-            val message = if (failure == SoundFailure.Unreadable) soundUnreadableMessage else soundFailedMessage
-            Toast.makeText(context, message, Toast.LENGTH_LONG).show()
-        }
-    }
-    // ALL_CALENDARS, a calendar id, or null when no pick is pending.
-    var soundTarget by rememberSaveable { mutableStateOf<Long?>(null) }
-    val soundPicker = rememberLauncherForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
-        val target = soundTarget
-        soundTarget = null
-        val picked = pickedSound(result.resultCode, result.data) ?: return@rememberLauncherForActivityResult
-        when (target) {
-            null -> Unit
-            ALL_CALENDARS -> viewModel.setReminderSoundForAll(picked.uri)
-            else -> viewModel.setReminderSound(target, picked.uri)
-        }
-    }
-    val pickSoundTitle = stringResource(R.string.settings_notification_sound)
-    val pickSound: (Long) -> Unit = pick@{ target ->
-        if (soundTarget != null) return@pick
-        val current = if (target == ALL_CALENDARS) {
-            (sharedSound(sounds, calendarIds) as? SharedSound.Same)?.sound
-        } else {
-            sounds[target]
-        }
-        soundTarget = target
-        try {
-            // A missing or mixed sound preselects Default; a silent one, Silent.
-            val preselect = if (current == null) DEFAULT_NOTIFICATION_URI else current.uri
-            soundPicker.launch(notificationSoundPickerIntent(preselect, pickSoundTitle))
-        } catch (e: RuntimeException) {
-            // No picker, or one that refuses to start: the system screen still has the sound.
-            soundTarget = null
-            if (target == ALL_CALENDARS) openAppSettings() else openCalendarSettings(target)
-        }
-    }
 
     CollapsingScaffold(
         title = stringResource(R.string.settings_section_notifications),
@@ -171,16 +93,6 @@ internal fun NotificationsScreen(
         predictiveBack = true,
         visible = visible,
     ) {
-        if (IS_SAMSUNG && !state.notificationCategoryHintDismissed) {
-            NotificationCategoryHint(
-                onOpen = {
-                    viewModel.dismissNotificationCategoryHint()
-                    openAppSettings()
-                },
-                onDismiss = viewModel::dismissNotificationCategoryHint,
-            )
-            Spacer(Modifier.height(16.dp))
-        }
         GroupedSwitchRow(
             title = stringResource(R.string.settings_reminders),
             checked = state.remindersEnabled,
@@ -188,25 +100,6 @@ internal fun NotificationsScreen(
             summary = stringResource(R.string.settings_reminders_hint),
             position = Position.Top,
         )
-        if (calendarIds.isNotEmpty()) {
-            GroupedRow(
-                title = stringResource(R.string.settings_notification_sound),
-                summary = loadedSounds?.let { globalSoundLabel(it, calendarIds) },
-                position = Position.Middle,
-                onClick = { pickSound(ALL_CALENDARS) },
-            )
-        }
-        GroupedRow(
-            title = stringResource(R.string.settings_notification_more),
-            summary = if (channelStatus.appBlocked) {
-                stringResource(R.string.settings_notifications_blocked_hint)
-            } else {
-                stringResource(R.string.settings_notification_sound_hint)
-            },
-            position = Position.Middle,
-            trailing = { ExternalLinkIcon() },
-            onClick = openAppSettings,
-        )
         GroupedRow(
             title = stringResource(R.string.settings_default_reminder),
             summary = reminderChoiceLabel(state.defaultReminderMinutes),
@@ -256,8 +149,10 @@ internal fun NotificationsScreen(
             onClick = { showSnooze = true },
         )
 
-        // Per-calendar notifications and reminder overrides (#145, #272).
-        if (state.reminderCalendars.isNotEmpty()) {
+        // Per-calendar overrides, folded behind one header. Each writable
+        // calendar may keep, drop or replace the global default, separately for
+        // timed and all-day events.
+        if (state.writableCalendars.isNotEmpty()) {
             Spacer(Modifier.height(24.dp))
             GroupedRow(
                 title = stringResource(R.string.settings_calendar_reminders_title),
@@ -272,18 +167,30 @@ internal fun NotificationsScreen(
                 exit = collapseExit(),
             ) {
                 Column {
-                    state.reminderCalendars.forEach { calendar ->
+                    state.writableCalendars.forEach { calendar ->
                         Spacer(Modifier.height(16.dp))
+                        // Special-dates calendars own their reminders in their
+                        // own section — link there instead.
+                        if (calendar.id in state.managedCalendarIds) {
+                            GroupedRow(
+                                title = calendar.displayName.orUnnamed(),
+                                summary = stringResource(R.string.settings_calendar_reminders_managed_hint),
+                                position = Position.Alone,
+                                leading = { CalendarColorChip(calendar.color) },
+                                trailing = {
+                                    Icon(
+                                        imageVector = Icons.AutoMirrored.Filled.KeyboardArrowRight,
+                                        contentDescription = null,
+                                        tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                                    )
+                                },
+                                onClick = onOpenSpecialDates,
+                            )
+                            return@forEach
+                        }
                         val expanded = calendar.id in expandedCalendars
-                        val notifying = calendar.id !in state.mutedReminderCalendarIds
-                        val blocked = notifying && calendar.id in channelStatus.blockedCalendarIds
                         GroupedRow(
                             title = calendar.displayName.orUnnamed(),
-                            summary = when {
-                                !notifying -> stringResource(R.string.settings_calendar_notifications_off)
-                                blocked -> stringResource(R.string.settings_notifications_blocked)
-                                else -> null
-                            },
                             position = if (expanded) Position.Top else Position.Alone,
                             leading = { CalendarColorChip(calendar.color) },
                             trailing = { ExpandIcon(expanded) },
@@ -300,18 +207,22 @@ internal fun NotificationsScreen(
                             enter = expandEnter(),
                             exit = collapseExit(),
                         ) {
-                            CalendarNotificationRows(
-                                calendar = calendar,
-                                state = state,
-                                notifying = notifying,
-                                blocked = blocked,
-                                soundLabel = loadedSounds?.let { soundLabel(it[calendar.id]) },
-                                onSetNotifying = { viewModel.setCalendarRemindersEnabled(calendar.id, it) },
-                                onPickSound = { pickSound(calendar.id) },
-                                onOpenSettings = { openCalendarSettings(calendar.id) },
-                                onOpenSpecialDates = onOpenSpecialDates,
-                                onEditOverride = { overrideDialog = it },
-                            )
+                            Column {
+                                val timed = state.perCalendarReminderOverride.reminderOverrideFor(calendar.id)
+                                GroupedRow(
+                                    title = stringResource(R.string.settings_default_reminder),
+                                    summary = calendarOverrideSummary(timed, state.defaultReminderMinutes),
+                                    position = Position.Middle,
+                                    onClick = { overrideDialog = OverrideTarget(calendar.id, isAllDay = false) },
+                                )
+                                val allDay = state.perCalendarAllDayReminderOverride.reminderOverrideFor(calendar.id)
+                                GroupedRow(
+                                    title = stringResource(R.string.settings_default_reminder_allday),
+                                    summary = calendarOverrideSummary(allDay, state.defaultAllDayReminderMinutes),
+                                    position = Position.Bottom,
+                                    onClick = { overrideDialog = OverrideTarget(calendar.id, isAllDay = true) },
+                                )
+                            }
                         }
                     }
                 }
@@ -398,152 +309,6 @@ internal fun NotificationsScreen(
     }
 }
 
-/**
- * One calendar's expanded rows: its notification switch and channel deep-link
- * for every calendar, then the default-reminder overrides where it takes them —
- * or, for a special-dates calendar, a link to the section that owns them.
- */
-@Composable
-private fun CalendarNotificationRows(
-    calendar: CalendarSource,
-    state: SettingsUiState,
-    notifying: Boolean,
-    blocked: Boolean,
-    soundLabel: String?,
-    onSetNotifying: (Boolean) -> Unit,
-    onPickSound: () -> Unit,
-    onOpenSettings: () -> Unit,
-    onOpenSpecialDates: () -> Unit,
-    onEditOverride: (OverrideTarget) -> Unit,
-) {
-    val managed = calendar.id in state.managedCalendarIds
-    val takesOverrides = calendar.canModifyContents && !managed
-    Column {
-        GroupedSwitchRow(
-            title = stringResource(R.string.settings_calendar_notifications),
-            checked = notifying,
-            onCheckedChange = onSetNotifying,
-            summary = stringResource(R.string.settings_calendar_notifications_hint),
-            position = Position.Middle,
-        )
-        GroupedRow(
-            title = stringResource(R.string.settings_notification_sound),
-            summary = soundLabel,
-            position = Position.Middle,
-            onClick = onPickSound,
-        )
-        GroupedRow(
-            title = stringResource(R.string.settings_notification_more),
-            summary = if (blocked) {
-                stringResource(R.string.settings_notifications_blocked_hint)
-            } else {
-                stringResource(R.string.settings_calendar_notification_sound_hint)
-            },
-            position = if (managed || takesOverrides) Position.Middle else Position.Bottom,
-            trailing = { ExternalLinkIcon() },
-            onClick = onOpenSettings,
-        )
-        if (managed) {
-            GroupedRow(
-                title = stringResource(R.string.settings_default_reminder_allday),
-                summary = stringResource(R.string.settings_calendar_reminders_managed_hint),
-                position = Position.Bottom,
-                trailing = {
-                    Icon(
-                        imageVector = Icons.AutoMirrored.Filled.KeyboardArrowRight,
-                        contentDescription = null,
-                        tint = MaterialTheme.colorScheme.onSurfaceVariant,
-                    )
-                },
-                onClick = onOpenSpecialDates,
-            )
-        } else if (takesOverrides) {
-            val timed = state.perCalendarReminderOverride.reminderOverrideFor(calendar.id)
-            GroupedRow(
-                title = stringResource(R.string.settings_default_reminder),
-                summary = calendarOverrideSummary(timed, state.defaultReminderMinutes),
-                position = Position.Middle,
-                onClick = { onEditOverride(OverrideTarget(calendar.id, isAllDay = false)) },
-            )
-            val allDay = state.perCalendarAllDayReminderOverride.reminderOverrideFor(calendar.id)
-            GroupedRow(
-                title = stringResource(R.string.settings_default_reminder_allday),
-                summary = calendarOverrideSummary(allDay, state.defaultAllDayReminderMinutes),
-                position = Position.Bottom,
-                onClick = { onEditOverride(OverrideTarget(calendar.id, isAllDay = true)) },
-            )
-        }
-    }
-}
-
-/** [soundTarget] meaning every calendar at once. */
-private const val ALL_CALENDARS = Long.MIN_VALUE
-
-/** What the calendars that have a channel share, sound-wise. */
-private sealed interface SharedSound {
-    data object None : SharedSound
-    data object Mixed : SharedSound
-    data class Same(val sound: ReminderSound) : SharedSound
-}
-
-private fun sharedSound(sounds: Map<Long, ReminderSound>, calendarIds: List<Long>): SharedSound {
-    val distinct = calendarIds.mapNotNull { sounds[it] }.distinctBy { it.uri }
-    return when (distinct.size) {
-        0 -> SharedSound.None
-        1 -> SharedSound.Same(distinct.single())
-        else -> SharedSound.Mixed
-    }
-}
-
-@Composable
-private fun soundLabel(sound: ReminderSound?): String = when {
-    sound == null -> stringResource(R.string.settings_notification_sound_default)
-    sound.uri == null -> stringResource(R.string.settings_notification_sound_silent)
-    sound.uri == DEFAULT_NOTIFICATION_URI -> sound.title
-        ?.let { stringResource(R.string.settings_notification_sound_default_named, it) }
-        ?: stringResource(R.string.settings_notification_sound_default)
-    else -> sound.title ?: stringResource(R.string.settings_notification_sound_custom)
-}
-
-@Composable
-private fun globalSoundLabel(sounds: Map<Long, ReminderSound>, calendarIds: List<Long>): String =
-    when (val shared = sharedSound(sounds, calendarIds)) {
-        SharedSound.None -> soundLabel(null)
-        SharedSound.Mixed -> stringResource(R.string.settings_notification_sound_mixed)
-        is SharedSound.Same -> soundLabel(shared.sound)
-    }
-
-/** Samsung's One UI can start a new notification category switched off (#145). */
-private val IS_SAMSUNG = Build.MANUFACTURER.equals("samsung", ignoreCase = true)
-
-/** The one-time Samsung note, with a way into the app's notification settings. */
-@Composable
-private fun NotificationCategoryHint(onOpen: () -> Unit, onDismiss: () -> Unit) {
-    IconInfoCard(
-        icon = Icons.Outlined.Info,
-        iconContentDescription = null,
-        iconAlignment = Alignment.Top,
-    ) {
-        Text(
-            text = stringResource(R.string.settings_notification_category_hint),
-            style = MaterialTheme.typography.bodyMedium,
-        )
-        Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.End) {
-            TextButton(onClick = onDismiss) { Text(stringResource(R.string.reminder_action_dismiss)) }
-            TextButton(onClick = onOpen) { Text(stringResource(R.string.settings_notification_category_hint_open)) }
-        }
-    }
-}
-
-@Composable
-private fun ExternalLinkIcon() {
-    Icon(
-        imageVector = Icons.AutoMirrored.Filled.OpenInNew,
-        contentDescription = null,
-        tint = MaterialTheme.colorScheme.onSurfaceVariant,
-    )
-}
-
 /** Which calendar + event kind a per-calendar reminder-override dialog targets. */
 private data class OverrideTarget(val calendarId: Long, val isAllDay: Boolean)
 

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/SettingsUiState.kt

@@ -1,6 +1,5 @@
 package de.jeanlucmakiola.calendula.ui.settings
 
-import android.net.Uri
 import de.jeanlucmakiola.floret.reminders.ReminderOverride
 import de.jeanlucmakiola.calendula.data.prefs.PastEventDisplay
 import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
@@ -97,14 +96,8 @@ data class SettingsUiState(
     val perCalendarReminderOverride: Map<Long, List<Int>> = emptyMap(),
     /** Per-calendar overrides of [defaultAllDayReminderMinutes] for all-day events. */
     val perCalendarAllDayReminderOverride: Map<Long, List<Int>> = emptyMap(),
-    /** Switched-on calendars you can edit: the per-calendar event-duration rows. */
+    /** Writable calendars, shown as per-calendar reminder-override rows. */
     val writableCalendars: List<CalendarSource> = emptyList(),
-    /** Switched-on calendars, each with its own notification switch and channel (#145, #272). */
-    val reminderCalendars: List<CalendarSource> = emptyList(),
-    /** Calendars whose reminders Calendula doesn't post (#272). */
-    val mutedReminderCalendarIds: Set<Long> = emptySet(),
-    /** Whether the Samsung notification-category hint has been dismissed (#145); hidden until prefs load. */
-    val notificationCategoryHintDismissed: Boolean = true,
     /**
      * Whether the event-colour picker is offered on calendars that publish no
      * colour palette (the colour may then not survive their next sync).
@@ -137,9 +130,3 @@ data class SpecialDatesUiState(
     /** Epoch millis of the last sync, or 0 if it has never run. */
     val lastRun: Long = 0L,
 )
-
-/** A reminder channel's sound: null [uri] is silent; [title] is null when it can't be resolved. */
-data class ReminderSound(val uri: Uri?, val title: String?)
-
-/** Why a picked reminder sound wasn't applied. */
-enum class SoundFailure { NotApplied, Unreadable }

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/SettingsViewModel.kt

@@ -3,8 +3,6 @@ package de.jeanlucmakiola.calendula.ui.settings
 import android.content.Context
 import android.net.Uri
 import android.os.Build
-import android.provider.Settings
-import android.util.Log
 import androidx.datastore.preferences.core.Preferences
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
@@ -18,12 +16,10 @@ import de.jeanlucmakiola.calendula.data.contacts.SpecialDatesScheduler
 import de.jeanlucmakiola.calendula.data.contacts.SpecialDatesSyncEngine
 import de.jeanlucmakiola.calendula.data.contacts.resolveTitleTemplate
 import de.jeanlucmakiola.calendula.data.fonts.CustomFontStore
-import de.jeanlucmakiola.floret.android.ringtoneTitle
 import de.jeanlucmakiola.floret.android.stateWhileSubscribed
 import de.jeanlucmakiola.floret.di.IoDispatcher
 import de.jeanlucmakiola.floret.reminders.ReminderOverride
 import de.jeanlucmakiola.floret.reminders.reminderOverrideFor
-import de.jeanlucmakiola.calendula.data.prefs.CalendarPrefs
 import de.jeanlucmakiola.calendula.data.prefs.PastEventDisplay
 import de.jeanlucmakiola.calendula.data.prefs.SettingsKeys
 import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
@@ -37,8 +33,6 @@ import de.jeanlucmakiola.calendula.data.prefs.SpecialDatesStalledReason
 import de.jeanlucmakiola.floret.prefs.ThemeMode
 import de.jeanlucmakiola.calendula.data.prefs.TimeFormatPref
 import de.jeanlucmakiola.calendula.data.prefs.WeekStartPref
-import de.jeanlucmakiola.calendula.data.reminders.ReminderChannelStatus
-import de.jeanlucmakiola.calendula.data.reminders.ReminderChannels
 import de.jeanlucmakiola.calendula.data.reminders.ReminderScanner
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventFormField
@@ -51,12 +45,7 @@ import de.jeanlucmakiola.calendula.ui.common.TimelineScale
 import de.jeanlucmakiola.calendula.ui.month.MonthViewStyle
 import de.jeanlucmakiola.calendula.ui.theme.AppFontSettings
 import de.jeanlucmakiola.calendula.ui.theme.FONT_CUSTOM_TOKEN
-import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineDispatcher
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.NonCancellable
-import kotlinx.coroutines.channels.Channel
-import kotlinx.coroutines.flow.receiveAsFlow
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -65,7 +54,6 @@ import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.catch
 import kotlinx.coroutines.flow.combine
-import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
@@ -74,13 +62,11 @@ import javax.inject.Inject
 @HiltViewModel
 class SettingsViewModel @Inject constructor(
     private val prefs: SettingsPrefs,
-    calendarPrefs: CalendarPrefs,
     repository: CalendarRepository,
     private val specialDatesEngine: SpecialDatesSyncEngine,
     specialDatesSpec: SpecialDatesCalendarSpec,
     private val launcherNameManager: LauncherNameManager,
     private val reminderScanner: ReminderScanner,
-    private val reminderChannels: ReminderChannels,
     @IoDispatcher private val io: CoroutineDispatcher,
     @ApplicationContext private val appContext: Context,
 ) : ViewModel() {
@@ -88,16 +74,16 @@ class SettingsViewModel @Inject constructor(
     private val dynamicColorAvailable = Build.VERSION.SDK_INT >= Build.VERSION_CODES.S
 
     /**
-     * Calendars that are switched on — the only ones that plan reminders at
-     * all (#75), so the only ones with notification settings.
+     * Writable calendars that are switched on — the only ones that take a
+     * per-calendar reminder override, since a switched-off one plans no
+     * reminders at all (#75).
      */
-    private val visibleCalendars: Flow<List<CalendarSource>> =
-        combine(repository.calendars(), calendarPrefs.pendingDisabledCalendarIds) { calendars, pending ->
-            calendars.filter { it.isVisibleInSystem && it.id !in pending }
-        }.catch { emit(emptyList()) }
+    private val writableCalendars: Flow<List<CalendarSource>> = repository.calendars()
+        .map { calendars -> calendars.filter { it.canModifyContents && it.isVisibleInSystem } }
+        .catch { emit(emptyList()) }
 
     val state: StateFlow<SettingsUiState> =
-        combine(prefs.data, visibleCalendars) { stored, calendars -> stored.toUiState(calendars) }
+        combine(prefs.data, writableCalendars) { stored, calendars -> stored.toUiState(calendars) }
             .stateWhileSubscribed(
                 scope = viewModelScope,
                 initialValue = SettingsUiState(dynamicColorAvailable = dynamicColorAvailable),
@@ -139,10 +125,7 @@ class SettingsViewModel @Inject constructor(
         snoozeMinutes = this[SettingsKeys.snoozeMinutes],
         perCalendarReminderOverride = this[SettingsKeys.perCalendarReminderOverride],
         perCalendarAllDayReminderOverride = this[SettingsKeys.perCalendarAllDayReminderOverride],
-        writableCalendars = calendars.filter { it.canModifyContents },
-        reminderCalendars = calendars,
-        mutedReminderCalendarIds = this[SettingsKeys.mutedReminderCalendarIds],
-        notificationCategoryHintDismissed = this[SettingsKeys.notificationCategoryHintDismissed],
+        writableCalendars = calendars,
         allowColorOnUnsupportedCalendars = this[SettingsKeys.allowColorOnUnsupportedCalendars],
         managedCalendarIds = specialDatesCalendars.values.toSet(),
     )
@@ -374,130 +357,6 @@ class SettingsViewModel @Inject constructor(
         }
     }
 
-    /**
-     * Re-plans, since a muted calendar armed no wake-up for its next reminder.
-     * Unmuting scans once more before the write, so the watermark starts at the
-     * unmute and nothing that came due while muted is replayed.
-     */
-    fun setCalendarRemindersEnabled(calendarId: Long, enabled: Boolean) {
-        viewModelScope.launch {
-            if (enabled) reminderScanner.scan()
-            prefs.setCalendarRemindersEnabled(calendarId, enabled)
-            reminderScanner.scan()
-        }
-    }
-
-    private val _channelStatus = MutableStateFlow(ReminderChannelStatus())
-
-    /** What the system blocks of the reminders; re-read with [refreshChannelStatus] (#145). */
-    val channelStatus: StateFlow<ReminderChannelStatus> = _channelStatus.asStateFlow()
-
-    private var channelStatusJob: Job? = null
-
-    private val _channelSounds = MutableStateFlow<Map<Long, ReminderSound>?>(null)
-
-    /** Each calendar's reminder sound (#518), null until first read; a calendar without a channel yet is absent. */
-    val channelSounds: StateFlow<Map<Long, ReminderSound>?> = _channelSounds.asStateFlow()
-
-    private val _soundFailed = Channel<SoundFailure>(Channel.CONFLATED)
-
-    /** Emits when a picked sound couldn't be applied; kept until the screen collects it. */
-    val soundFailed: Flow<SoundFailure> = _soundFailed.receiveAsFlow()
-
-    private val soundTitles = mutableMapOf<Uri, String?>()
-
-    fun refreshChannelStatus(calendarIds: Collection<Long>) {
-        channelStatusJob?.cancel()
-        channelStatusJob = viewModelScope.launch {
-            onChannels { status(calendarIds) }?.let { _channelStatus.value = it }
-            val sounds = onChannels { sounds(calendarIds) } ?: return@launch
-            _channelSounds.value = withContext(io) {
-                sounds.mapValues { (_, uri) ->
-                    ReminderSound(uri, uri?.let(::soundTitle))
-                }
-            }
-        }
-    }
-
-    /** A sound's title, cached unless it is a "default" alias whose target can change. */
-    private fun soundTitle(uri: Uri): String? {
-        if (uri.authority == Settings.AUTHORITY) return appContext.ringtoneTitle(uri)
-        return synchronized(soundTitles) { soundTitles.getOrPut(uri) { appContext.ringtoneTitle(uri) } }
-    }
-
-    /** Give [calendarId]'s reminders [sound] (null = silent), on a fresh channel (#518). */
-    fun setReminderSound(calendarId: Long, sound: Uri?) = applySound(sound) {
-        setSound(listOf(calendarId), sound, createMissing = true)
-    }
-
-    /**
-     * Give every switched-on calendar's reminders [sound]. Reads the calendars
-     * itself, so a pick returning after process death still finds them; those
-     * that only get a channel when something posts are left alone.
-     */
-    fun setReminderSoundForAll(sound: Uri?) = applySound(sound) {
-        try {
-            sync()
-        } catch (e: Exception) {
-            Log.w("SettingsViewModel", "Channel sync before a sound pick failed", e)
-        }
-        val ids = visibleCalendars.first().map { it.id }
-        ids.isNotEmpty() && setSound(ids, sound, createMissing = false)
-    }
-
-    private fun canRead(uri: Uri): Boolean = uri.authority == Settings.AUTHORITY ||
-        runCatching { appContext.contentResolver.openAssetFileDescriptor(uri, "r")?.close() != null }.getOrDefault(false)
-
-    /** Runs to completion even if the screen closes meanwhile, so a pick is never half-applied. */
-    private fun applySound(sound: Uri?, block: suspend ReminderChannels.() -> Boolean) {
-        viewModelScope.launch {
-            val failure = withContext(io + NonCancellable) {
-                try {
-                    // The system plays the sound but checks that Calendula could read it.
-                    when {
-                        sound != null && !canRead(sound) -> SoundFailure.Unreadable
-                        reminderChannels.block() -> null
-                        else -> SoundFailure.NotApplied
-                    }
-                } catch (e: Exception) {
-                    Log.w("SettingsViewModel", "Could not set the reminder sound", e)
-                    SoundFailure.NotApplied
-                }
-            }
-            failure?.let(_soundFailed::trySend)
-            refreshChannelStatus(visibleCalendars.first().map { it.id })
-        }
-    }
-
-    fun dismissNotificationCategoryHint() = save { dismissNotificationCategoryHint() }
-
-    /**
-     * The channel whose system screen to open for [calendarId] (#340), created
-     * if needed; null when only the app's own screen can help — the app or the
-     * calendar's account group is blocked there, or the channel couldn't be made.
-     */
-    suspend fun soundSettingsChannel(calendarId: Long): String? = onChannels {
-        val channelId = channelFor(calendarId) ?: return@onChannels null
-        val status = status(listOf(calendarId))
-        channelId.takeUnless { status.appBlocked || calendarId in status.groupBlockedCalendarIds }
-    }
-
-    /** Create the per-calendar channels before showing the app's channel list, even with reminders off. */
-    suspend fun syncReminderChannels() {
-        onChannels { sync() }
-    }
-
-    private suspend fun <T> onChannels(block: ReminderChannels.() -> T): T? = withContext(io) {
-        try {
-            reminderChannels.block()
-        } catch (e: CancellationException) {
-            throw e
-        } catch (e: Exception) {
-            Log.w("SettingsViewModel", "Reminder channel update failed", e)
-            null
-        }
-    }
-
     fun setAutofocusEventTitle(enabled: Boolean) = save { setAutofocusEventTitle(enabled) }
 
     fun setDefaultEventDuration(minutes: Int) = save { setDefaultEventDurationMinutes(minutes) }

app/src/main/res/values/strings.xml

@@ -731,26 +731,7 @@
     <string name="reminder_custom_amount">Amount</string>
     <string name="reminder_custom_set">Set</string>
     <string name="settings_calendar_reminders_title">Per-calendar reminders</string>
-    <string name="settings_calendar_reminders_hint">Turn notifications off or pick a sound per calendar, and override the default reminder for calendars you can edit.</string>
-    <string name="settings_calendar_notifications">Notifications</string>
-    <string name="settings_calendar_notifications_hint">Notify at this calendar\'s reminder times</string>
-    <string name="settings_calendar_notifications_off">Notifications off</string>
-    <string name="settings_notification_sound">Notification sound</string>
-    <string name="settings_notification_sound_silent">Silent</string>
-    <string name="settings_notification_sound_default">Default</string>
-    <!-- %1$s is the name of the device's default notification sound. -->
-    <string name="settings_notification_sound_default_named">Default (%1$s)</string>
-    <string name="settings_notification_sound_custom">Custom sound</string>
-    <string name="settings_notification_sound_failed">Couldn\'t change the notification sound</string>
-    <string name="settings_notification_sound_unreadable">Calendula can\'t play this sound. Pick another one.</string>
-    <string name="settings_notification_sound_mixed">Differs per calendar</string>
-    <string name="settings_notification_more">More notification settings</string>
-    <string name="settings_notification_sound_hint">Vibration, pop-ups and more for each calendar, in system settings</string>
-    <string name="settings_notifications_blocked">Blocked in system settings</string>
-    <string name="settings_notifications_blocked_hint">Blocked in system settings — tap to allow</string>
-    <string name="settings_notification_category_hint">On Samsung phones, new notification categories can start switched off. If a calendar\'s reminders don\'t arrive, check that its category is on.</string>
-    <string name="settings_notification_category_hint_open">Open settings</string>
-    <string name="settings_calendar_notification_sound_hint">Vibration, pop-ups and more for this calendar, in system settings</string>
+    <string name="settings_calendar_reminders_hint">Override the default per calendar — separately for timed and all-day events. A calendar can keep the default, drop it, or set its own.</string>
     <string name="settings_calendar_reminder_inherits">Default (%1$s)</string>
     <string name="settings_reliable_delivery">Reliable delivery</string>
     <string name="settings_reliable_delivery_hint">Android may delay reminders to save battery. Exempt Calendula so they arrive on time.</string>

app/src/test/java/de/jeanlucmakiola/calendula/data/prefs/SettingsPrefsTest.kt

@@ -601,30 +601,6 @@ class SettingsPrefsTest {
         assertThat(prefs.perCalendarEventDuration.first()).containsExactly(9L, 30)
     }
 
-    @Test
-    fun `calendar notifications default on and toggle per calendar`(
-        @TempDir tempDir: Path,
-    ) = runTest {
-        val prefs = testSettings(tempDir)
-        assertThat(prefs.mutedReminderCalendarIds.first()).isEmpty()
-        prefs.setCalendarRemindersEnabled(7L, false)
-        prefs.setCalendarRemindersEnabled(9L, false)
-        assertThat(prefs.mutedReminderCalendarIds.first()).containsExactly(7L, 9L)
-        prefs.setCalendarRemindersEnabled(7L, true)
-        assertThat(prefs.mutedReminderCalendarIds.first()).containsExactly(9L)
-    }
-
-    @Test
-    fun `reminder channel versions only grow`(
-        @TempDir tempDir: Path,
-    ) = runTest {
-        val prefs = testSettings(tempDir)
-        assertThat(prefs.reminderChannelVersions.first()).isEmpty()
-        assertThat(prefs.reserveReminderChannelVersions(mapOf(7L to 1))).containsExactly(7L, 1)
-        assertThat(prefs.reserveReminderChannelVersions(mapOf(7L to 1, 9L to 5))).containsExactly(7L, 2, 9L, 5)
-        assertThat(prefs.reminderChannelVersions.first()).containsExactly(7L, 2, 9L, 5)
-    }
-
     @Test
     fun `garbage per-calendar duration entries are dropped, the rest survive`(
         @TempDir tempDir: Path,

app/src/test/java/de/jeanlucmakiola/calendula/data/reminders/ReminderChannelPlanTest.kt

@@ -1,200 +0,0 @@
-package de.jeanlucmakiola.calendula.data.reminders
-
-import com.google.common.truth.Truth.assertThat
-import de.jeanlucmakiola.calendula.domain.CalendarSource
-import org.junit.jupiter.api.Test
-
-class ReminderChannelPlanTest {
-
-    private fun calendar(id: Long, account: String, type: String, local: Boolean = false) = CalendarSource(
-        id = id,
-        displayName = "Cal $id",
-        accountName = account,
-        accountType = type,
-        color = 0,
-        isVisibleInSystem = true,
-        isLocal = local,
-    )
-
-    @Test
-    fun `one channel per calendar, grouped by account`() {
-        val plan = planReminderChannels(
-            calendars = listOf(
-                calendar(1, "me@example.org", "com.google"),
-                calendar(2, "me@example.org", "com.google"),
-                calendar(3, "dav", "bitfire.at.davdroid"),
-            ),
-            existing = emptyList(),
-            existingGroupIds = emptyList(),
-            unnamed = "Unnamed",
-            description = DESC,
-        )
-        assertThat(plan.groups).hasSize(2)
-        assertThat(plan.channels.map { it.id })
-            .containsExactly(reminderChannelId(1), reminderChannelId(2), reminderChannelId(3))
-        assertThat(plan.channels[0].groupId).isEqualTo(plan.channels[1].groupId)
-        assertThat(plan.channels[2].groupId).isNotEqualTo(plan.channels[0].groupId)
-        assertThat(plan.staleChannelIds).isEmpty()
-    }
-
-    @Test
-    fun `device calendars share one group`() {
-        val plan = planReminderChannels(
-            calendars = listOf(
-                calendar(1, "Calendula", "LOCAL", local = true),
-                calendar(2, "Other", "LOCAL", local = true),
-            ),
-            existing = emptyList(),
-            existingGroupIds = emptyList(),
-            unnamed = "Unnamed",
-            description = DESC,
-        )
-        assertThat(plan.groups).hasSize(1)
-        assertThat(plan.groups.single().isLocal).isTrue()
-    }
-
-    @Test
-    fun `same account name under two types is ambiguous`() {
-        val plan = planReminderChannels(
-            calendars = listOf(
-                calendar(1, "me@example.org", "com.google"),
-                calendar(2, "me@example.org", "bitfire.at.davdroid"),
-                calendar(3, "work", "bitfire.at.davdroid"),
-            ),
-            existing = emptyList(),
-            existingGroupIds = emptyList(),
-            unnamed = "Unnamed",
-            description = DESC,
-        )
-        assertThat(plan.groups.filter { it.ambiguous }.map { it.accountType })
-            .containsExactly("com.google", "bitfire.at.davdroid")
-        assertThat(plan.groups.single { it.label == "work" }.ambiguous).isFalse()
-    }
-
-    @Test
-    fun `stale reminder channels and groups go, foreign ones stay`() {
-        val current = calendar(1, "me@example.org", "com.google")
-        fun plan(calendars: List<CalendarSource>, existing: List<String> = emptyList(), groups: List<String> = emptyList()) =
-            planReminderChannels(calendars, existing.map { ExistingReminderChannel(it, "Cal ${it.last()}", DESC, null) }, groups, "Unnamed", DESC)
-        val keptGroup = plan(listOf(current)).groups.single().id
-        val goneGroup = plan(listOf(calendar(9, "old", "com.google"))).groups.single().id
-        val result = plan(
-            calendars = listOf(current),
-            existing = listOf(reminderChannelId(1), reminderChannelId(9), LEGACY_REMINDER_CHANNEL_ID, "backup"),
-            groups = listOf(keptGroup, goneGroup, "other"),
-        )
-        assertThat(result.staleChannelIds).containsExactly(reminderChannelId(9))
-        assertThat(result.staleGroupIds).containsExactly(goneGroup)
-    }
-
-    @Test
-    fun `only missing or renamed channels are written`() {
-        val plan = planReminderChannels(
-            calendars = listOf(
-                calendar(1, "a", "com.google"),
-                calendar(2, "a", "com.google"),
-                calendar(3, "a", "com.google").copy(displayName = ""),
-                calendar(4, "a", "com.google"),
-            ),
-            existing = listOf(
-                ExistingReminderChannel(reminderChannelId(1), "Cal 1", DESC, "g"),
-                ExistingReminderChannel(reminderChannelId(4), "Cal 4", "Old description", "g"),
-                ExistingReminderChannel(reminderChannelId(2), "Old name", DESC, "g"),
-            ),
-            existingGroupIds = emptyList(),
-            unnamed = "Unnamed",
-            description = DESC,
-        )
-        assertThat(plan.channelsToWrite.map { it.calendarId }).containsExactly(2L, 3L, 4L)
-        assertThat(plan.channelsToWrite.single { it.calendarId == 3L }.name).isEqualTo("Unnamed")
-    }
-
-    @Test
-    fun `non-syncing calendars keep a channel but get none up front`() {
-        val quiet = calendar(2, "a", "com.google").copy(syncsEvents = false)
-        val fresh = planReminderChannels(listOf(quiet), emptyList(), emptyList(), "Unnamed", DESC)
-        assertThat(fresh.channelsToWrite).isEmpty()
-        assertThat(fresh.groupsInUse).isEmpty()
-        val posted = planReminderChannels(
-            calendars = listOf(quiet),
-            existing = listOf(ExistingReminderChannel(reminderChannelId(2), "Cal 2", DESC, null)),
-            existingGroupIds = emptyList(),
-            unnamed = "Unnamed",
-            description = DESC,
-        )
-        assertThat(posted.staleChannelIds).isEmpty()
-        assertThat(posted.channelsToWrite.map { it.calendarId }).containsExactly(2L)
-        assertThat(posted.groupsInUse).hasSize(1)
-    }
-
-    @Test
-    fun `blocked calendars follow app, channel and group`() {
-        val channels = mapOf(
-            reminderChannelId(1) to ReminderChannelState(blocked = true, groupId = "g1"),
-            reminderChannelId(2) to ReminderChannelState(blocked = false, groupId = "g2"),
-            reminderChannelId(3) to ReminderChannelState(blocked = false, groupId = "g1"),
-        )
-        val ids = listOf(1L, 2L, 3L, 4L)
-        val groupOff = reminderChannelStatus(ids, appEnabled = true, channels, blockedGroupIds = setOf("g2"))
-        assertThat(groupOff.blockedCalendarIds).containsExactly(1L, 2L)
-        assertThat(groupOff.groupBlockedCalendarIds).containsExactly(2L)
-        assertThat(reminderChannelStatus(ids, appEnabled = true, channels, blockedGroupIds = emptySet()).blockedCalendarIds)
-            .containsExactly(1L)
-        val appOff = reminderChannelStatus(ids, appEnabled = false, channels, blockedGroupIds = emptySet())
-        assertThat(appOff.appBlocked).isTrue()
-        assertThat(appOff.blockedCalendarIds).containsExactly(1L, 2L, 3L, 4L)
-    }
-
-    @Test
-    fun `channel ids round-trip with versions`() {
-        assertThat(parseReminderChannelId(reminderChannelId(7))).isEqualTo(7L to 0)
-        assertThat(parseReminderChannelId(reminderChannelId(7, 3))).isEqualTo(7L to 3)
-        assertThat(parseReminderChannelId("reminders.calendar.7.v0")).isNull()
-        assertThat(parseReminderChannelId("reminders.calendar.x")).isNull()
-        assertThat(parseReminderChannelId(LEGACY_REMINDER_CHANNEL_ID)).isNull()
-    }
-
-    @Test
-    fun `a version bump retires the old channel unless it is showing`() {
-        val existing = listOf(
-            ExistingReminderChannel(reminderChannelId(1), "Cal 1", DESC, "g"),
-            ExistingReminderChannel(reminderChannelId(2), "Cal 2", DESC, "g"),
-        )
-        val plan = planReminderChannels(
-            calendars = listOf(calendar(1, "a", "com.google"), calendar(2, "a", "com.google")),
-            existing = existing,
-            existingGroupIds = emptyList(),
-            unnamed = "Unnamed",
-            description = DESC,
-            versions = mapOf(1L to 2, 2L to 1),
-            showingChannelIds = setOf(reminderChannelId(2)),
-        )
-        assertThat(plan.channels.map { it.id }).containsExactly(reminderChannelId(1, 2), reminderChannelId(2, 1))
-        assertThat(plan.staleChannelIds).containsExactly(reminderChannelId(1))
-        assertThat(plan.keptChannelIds).containsExactly(reminderChannelId(2))
-    }
-
-    @Test
-    fun `the current version is the highest that exists, else the high-water mark`() {
-        val versions = currentReminderChannelVersions(
-            existingChannelIds = listOf(reminderChannelId(1), reminderChannelId(1, 2), reminderChannelId(3), "backup"),
-            highWater = mapOf(1L to 5, 2L to 4),
-        )
-        // Calendar 1 reserved v5 but never wrote it, so v2 stays current.
-        assertThat(versions).containsExactly(1L, 2, 2L, 4, 3L, 0)
-    }
-
-    @Test
-    fun `status reads the current channel version`() {
-        val channels = mapOf(
-            reminderChannelId(1) to ReminderChannelState(blocked = true, groupId = null),
-            reminderChannelId(1, 2) to ReminderChannelState(blocked = false, groupId = null),
-        )
-        val status = reminderChannelStatus(listOf(1L), true, channels, emptySet(), versions = mapOf(1L to 2))
-        assertThat(status.blockedCalendarIds).isEmpty()
-    }
-
-    private companion object {
-        const val DESC = "Reminders"
-    }
-}

docs/ARCHITECTURE.md

@@ -391,36 +391,6 @@ gate also covers a snooze re-shown from our own alarm after its calendar was
 switched off. The drawer's filter sheet (`CalendarPrefs.hiddenCalendarIds`) is a
 separate in-app declutter that never touches reminders.
 
-**A channel per calendar (#145).** `ReminderChannels` keeps one notification
-channel per calendar, grouped by account (one that syncs no events only gets
-its channel once something posts on it), so a calendar can be
-muted or given its own sound in the system settings before it ever fires. Every
-scan with reminders on syncs them (skipped when nothing changed): missing
-channels are created, renamed ones updated, and channels of deleted calendars
-removed — but never on an empty snapshot, which is a provider hiccup more often
-than every calendar gone. Switched-off calendars keep theirs, so toggling one
-never cancels a showing reminder or loses its settings. `post` creates a missing
-channel itself, so a reminder never waits on a sync. A new channel copies the sound, vibration and
-importance of the pre-#145 single `reminders` channel, which is deleted once
-nothing showing still sits on it. Settings → Notifications deep-links into the
-system's channel screens for everything but the sound (#340). A sound picked in
-the app (#518) can't be set on an existing channel, so
-`ReminderChannels.setSound` recreates it under a new version
-(`reminders.calendar.<id>.v<n>`), copying everything else from the old one. The
-current version is simply the highest channel that exists, so the new one only
-takes over once written; `SettingsPrefs.reminderChannelVersions` is just a
-high-water mark that keeps ids from being reused (a re-used id would bring back
-the deleted channel's settings). `setSound` leaves the old version to the sync,
-which treats older versions as stale and keeps one while a notification still
-shows on it; `ReminderNotifier.post` resolves and posts under the channel lock
-(`withChannel`), so a pick never moves a channel mid-post.
-Separate from the channels, `SettingsPrefs.mutedReminderCalendarIds` is the in-app per-calendar
-off switch (#272): the scan plans nothing for those calendars (so they arm no
-wake-ups; toggling it re-scans), and `ReminderNotifier.post` checks it again
-for snoozes. The settings screen re-reads `ReminderChannels.status` on every
-resume and marks a calendar "Blocked in system settings" when the app, its
-channel or its account group is switched off there.
-
 Deliberately absent: a fallback to the provider's `EVENT_REMINDER` broadcast.
 Keeping both would double-post wherever the provider works, and Etar's way out —
 a latch that disables its own scheduling once a real broadcast arrives — cannot