feat(intent): handle ACTION_EDIT and broaden .ics MIME types

Round out the calendar-intent surface toward AOSP/Etar parity — the app
already handled VIEW (date + event), INSERT, and .ics open/share, but was
missing the edit action and the alternate .ics MIME labels.

- ACTION_EDIT on content://com.android.calendar/events/<id> now opens the
  event in the edit form (previously only VIEW → read-only detail existed).
  An assistant, task app, or widget can hand an event to Calendula to edit.
  A bare EDIT URI with no occurrence extras falls back to the event row's
  own DTSTART/DTEND, mirroring the #48 view-event fallback.
- ACTION_EDIT with no event id (AOSP's "edit a new event") maps to the same
  prefilled create form as ACTION_INSERT.
- The .ics VIEW/SEND filters now also accept text/x-vcalendar (vCalendar
  1.0 / .vcs) and application/ics — the alternate labels the same calendar
  data arrives under from some file/mail apps (matches Etar's ImportActivity).

Deliberately excluded: webcal:// / http(s) remote-calendar subscription
(needs INTERNET, which the app doesn't have) and the Google-web-link handler
(Google-specific + network).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/src/main/AndroidManifest.xml

@@ -97,32 +97,58 @@
                 <data android:mimeType="time/epoch" />
             </intent-filter>
 
-            <!-- Open a .ics file (file manager / email attachment / browser). -->
+            <!-- Open a .ics/.vcs file (file manager / email attachment / browser).
+                 The three MIME types cover the common labels the same calendar
+                 data arrives under: iCalendar 2.0 (text/calendar), the older
+                 vCalendar 1.0 / .vcs (text/x-vcalendar), and application/ics some
+                 mail apps emit — Android cross-products the scheme and mimeType
+                 tags, so each MIME is accepted on both schemes (matches Etar). -->
             <intent-filter>
                 <action android:name="android.intent.action.VIEW" />
                 <category android:name="android.intent.category.DEFAULT" />
                 <category android:name="android.intent.category.BROWSABLE" />
-                <data android:scheme="content" android:mimeType="text/calendar" />
-                <data android:scheme="file" android:mimeType="text/calendar" />
+                <data android:scheme="content" />
+                <data android:scheme="file" />
+                <data android:mimeType="text/calendar" />
+                <data android:mimeType="text/x-vcalendar" />
+                <data android:mimeType="application/ics" />
             </intent-filter>
-            <!-- Receive a .ics shared from another app. -->
+            <!-- Receive a .ics/.vcs shared from another app (same MIME set). -->
             <intent-filter>
                 <action android:name="android.intent.action.SEND" />
                 <category android:name="android.intent.category.DEFAULT" />
                 <data android:mimeType="text/calendar" />
+                <data android:mimeType="text/x-vcalendar" />
+                <data android:mimeType="application/ics" />
             </intent-filter>
 
             <!-- Let another app or widget (e.g. the Todo Agenda widget) launch us
                  to create a new event, the way the AOSP calendar accepts it:
                  ACTION_INSERT on the events dir mime type, carrying the new
                  event's fields as CalendarContract extras
-                 (MainActivity.insertFormOrNull, issue #30). -->
+                 (MainActivity.insertFormOrNull, issue #30). ACTION_EDIT on the
+                 dir mime is AOSP's "edit a new event" — i.e. create — so it maps
+                 to the same prefilled create form. -->
             <intent-filter>
                 <action android:name="android.intent.action.INSERT" />
+                <action android:name="android.intent.action.EDIT" />
                 <category android:name="android.intent.category.DEFAULT" />
                 <data android:mimeType="vnd.android.cursor.dir/event" />
             </intent-filter>
 
+            <!-- Edit an existing event another app/assistant/widget points at:
+                 ACTION_EDIT on content://com.android.calendar/events/<id>, the way
+                 AOSP fires it. Opens the occurrence in the edit form (not the
+                 read-only detail — that's the VIEW filter above). Matched by the
+                 provider's item MIME type, like the VIEW filter. The occurrence's
+                 times ride as EXTRA_EVENT_BEGIN_TIME / EXTRA_EVENT_END_TIME when
+                 supplied (MainActivity.editEventKeyOrNull). -->
+            <intent-filter>
+                <action android:name="android.intent.action.EDIT" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data android:mimeType="vnd.android.cursor.item/event" />
+            </intent-filter>
+
             <!-- Open an existing event another app/widget points at (e.g. tapping
                  an event in the Todo Agenda widget): ACTION_VIEW on
                  content://com.android.calendar/events/<id>, the way AOSP fires it.

app/src/main/java/de/jeanlucmakiola/calendula/MainActivity.kt

@@ -70,6 +70,11 @@ class MainActivity : AppCompatActivity() {
     // CalendarHost, which opens it in the create form for review.
     private var requestedInsertForm by mutableStateOf<EventForm?>(null)
 
+    // An external "edit this event" (ACTION_EDIT on content://.../events/<id>):
+    // opens the occurrence in the edit form. Same occurrence-key shape as the
+    // detail channel; consumed once by CalendarHost.
+    private var requestedEditKey by mutableStateOf<LongArray?>(null)
+
     // A captured crash report awaiting the user's decision, surfaced as a dialog
     // over the calendar on the next launch (the single-crash path). A startup
     // crash-loop is handled out of band, before setContent — see below.
@@ -95,6 +100,7 @@ class MainActivity : AppCompatActivity() {
         requestedNav = intent.navRequestOrNull()
         requestedImportUri = intent.importUriOrNull()
         requestedInsertForm = intent.insertFormOrNull()
+        requestedEditKey = intent.editEventKeyOrNull()
         if (CrashReporter.shouldPrompt(this)) pendingCrashReport = CrashReporter.pendingReport(this)
         setContent {
             // One activity-scoped SettingsViewModel drives both the theme here
@@ -145,6 +151,8 @@ class MainActivity : AppCompatActivity() {
                             onImportConsumed = { requestedImportUri = null },
                             requestedInsertForm = requestedInsertForm,
                             onInsertConsumed = { requestedInsertForm = null },
+                            requestedEditKey = requestedEditKey,
+                            onEditKeyConsumed = { requestedEditKey = null },
                         )
                     }
                     // A persistent corner marker so a debug build is never
@@ -183,6 +191,7 @@ class MainActivity : AppCompatActivity() {
         intent.navRequestOrNull()?.let { requestedNav = it }
         intent.importUriOrNull()?.let { requestedImportUri = it }
         intent.insertFormOrNull()?.let { requestedInsertForm = it }
+        intent.editEventKeyOrNull()?.let { requestedEditKey = it }
     }
 
     /**
@@ -203,13 +212,19 @@ class MainActivity : AppCompatActivity() {
     }
 
     /**
-     * A prefilled new-event form from an external `ACTION_INSERT` launch — another
-     * app or widget (e.g. Todo Agenda) asking us to create an event (issue #30).
-     * The new event's fields ride as CalendarContract extras; anything omitted
-     * falls back to the in-app "new event" defaults in [buildInsertEventForm].
+     * A prefilled new-event form from an external launch asking us to create an
+     * event — another app or widget (e.g. Todo Agenda) firing `ACTION_INSERT`
+     * (issue #30), or `ACTION_EDIT` with no concrete event id (AOSP's "edit a new
+     * event", i.e. create). The new event's fields ride as CalendarContract
+     * extras; anything omitted falls back to the in-app "new event" defaults in
+     * [buildInsertEventForm].
      */
     private fun Intent.insertFormOrNull(): EventForm? {
-        if (action != Intent.ACTION_INSERT) return null
+        // ACTION_EDIT on an existing event routes to the edit form instead
+        // ([editEventKeyOrNull]); only an id-less EDIT is a create.
+        val isCreate = action == Intent.ACTION_INSERT ||
+            (action == Intent.ACTION_EDIT && editEventKeyOrNull() == null)
+        if (!isCreate) return null
         return buildInsertEventForm(
             beginMillis = longExtraOrNull(CalendarContract.EXTRA_EVENT_BEGIN_TIME),
             endMillis = longExtraOrNull(CalendarContract.EXTRA_EVENT_END_TIME),
@@ -318,6 +333,31 @@ class MainActivity : AppCompatActivity() {
         )
     }
 
+    /**
+     * The occurrence key for an external "edit this event" — `ACTION_EDIT` on
+     * `content://com.android.calendar/events/<id>`, the way AOSP fires it (e.g.
+     * an assistant, task app, or widget that wants to open the event for editing
+     * rather than viewing). Opens it in the edit form. Reuses the same
+     * occurrence-key channel as reminder/view taps; the caller passes the
+     * occurrence's times as `EXTRA_EVENT_BEGIN_TIME` / `EXTRA_EVENT_END_TIME`
+     * when it has them, otherwise we carry [NO_OCCURRENCE_TIME] and
+     * [EventEditViewModel.openForEdit] falls back to the event row's own
+     * DTSTART/DTEND. An id-less `ACTION_EDIT` is a create instead ([insertFormOrNull]).
+     */
+    private fun Intent.editEventKeyOrNull(): LongArray? {
+        if (action != Intent.ACTION_EDIT) return null
+        val uri = data ?: return null
+        if (uri.host != CALENDAR_PROVIDER_HOST) return null
+        val segments = uri.pathSegments
+        if (segments.firstOrNull() != "events") return null
+        val eventId = segments.getOrNull(1)?.toLongOrNull() ?: return null
+        return longArrayOf(
+            eventId,
+            longExtraOrNull(CalendarContract.EXTRA_EVENT_BEGIN_TIME) ?: NO_OCCURRENCE_TIME,
+            longExtraOrNull(CalendarContract.EXTRA_EVENT_END_TIME) ?: NO_OCCURRENCE_TIME,
+        )
+    }
+
     companion object {
         // The calendar provider's authority/host. A date tap arrives as
         // ACTION_VIEW on content://com.android.calendar/time/<epochMillis>.

app/src/main/java/de/jeanlucmakiola/calendula/ui/CalendarHost.kt

@@ -33,6 +33,7 @@ import de.jeanlucmakiola.calendula.ui.common.viewBaseStack
 import de.jeanlucmakiola.calendula.ui.day.DayScreen
 import de.jeanlucmakiola.calendula.ui.detail.EventDetailScreen
 import de.jeanlucmakiola.calendula.ui.edit.EventEditScreen
+import de.jeanlucmakiola.calendula.ui.edit.ImportSource
 import de.jeanlucmakiola.calendula.ui.imports.ImportScreen
 import de.jeanlucmakiola.calendula.ui.month.MonthScreen
 import de.jeanlucmakiola.calendula.ui.search.SearchScreen
@@ -74,6 +75,8 @@ fun CalendarHost(
     onImportConsumed: () -> Unit = {},
     requestedInsertForm: EventForm? = null,
     onInsertConsumed: () -> Unit = {},
+    requestedEditKey: LongArray? = null,
+    onEditKeyConsumed: () -> Unit = {},
     viewModel: CalendarHostViewModel = hiltViewModel(),
 ) {
     // Wait for the persisted default view before seeding the stack, so the app
@@ -172,6 +175,9 @@ fun CalendarHost(
     // picker (many). A plain conditional overlay (no slide) — it's transient.
     var importUri by remember { mutableStateOf<android.net.Uri?>(null) }
     var importForm by remember { mutableStateOf<EventForm?>(null) }
+    // Which channel filled [importForm]: an .ics file (prompt to apply the default
+    // reminder) or an ACTION_INSERT intent (apply it automatically) — #49.
+    var importFormSource by remember { mutableStateOf(ImportSource.File) }
     // A restore (in-app "Restore from .ics" button) always runs the full import
     // flow — picker + summary — even for a single-event file, because the intent
     // is "restore a backup", not "add this one event". An externally opened .ics
@@ -190,6 +196,7 @@ fun CalendarHost(
     // reveals on top of whatever was open without extra dismissal.
     LaunchedEffect(requestedInsertForm) {
         if (requestedInsertForm != null) {
+            importFormSource = ImportSource.Insert
             importForm = requestedInsertForm
             onInsertConsumed()
         }
@@ -207,6 +214,20 @@ fun CalendarHost(
         importForm = null
     }
 
+    // An external "edit this event" (ACTION_EDIT, e.g. an assistant/task app or
+    // widget) opens the occurrence straight in the edit form. Drop any covering
+    // overlay first — the edit overlay sits below Settings/import in the Box, so
+    // without this it would open hidden underneath them. Same held-key pattern as
+    // a detail-screen "Edit" tap; a saved edit just returns to the calendar.
+    LaunchedEffect(requestedEditKey) {
+        if (requestedEditKey != null) {
+            dismissCoveringOverlays()
+            heldEditKey = requestedEditKey
+            editKey = requestedEditKey
+            onEditKeyConsumed()
+        }
+    }
+
     // A home-screen widget launch asks to open a date (→ day view), open an
     // event's detail, or start a create. Handled once and cleared, mirroring
     // [requestedDetailKey]. Date/event opens root the stack in the widget's own
@@ -435,6 +456,7 @@ fun CalendarHost(
                 onClose = { importUri = null },
                 onOpenSingle = { form ->
                     importUri = null
+                    importFormSource = ImportSource.File
                     importForm = form
                 },
             )
@@ -443,6 +465,7 @@ fun CalendarHost(
             EventEditScreen(
                 initialDateIso = null,
                 initialForm = form,
+                initialFormSource = importFormSource,
                 onClose = { importForm = null },
                 onSaved = { importForm = null },
             )

app/src/main/java/de/jeanlucmakiola/calendula/ui/RootScreen.kt

@@ -37,6 +37,8 @@ fun RootScreen(
     onImportConsumed: () -> Unit = {},
     requestedInsertForm: de.jeanlucmakiola.calendula.domain.EventForm? = null,
     onInsertConsumed: () -> Unit = {},
+    requestedEditKey: LongArray? = null,
+    onEditKeyConsumed: () -> Unit = {},
 ) {
     val context = LocalContext.current
     var hasPermission by remember {
@@ -88,6 +90,8 @@ fun RootScreen(
                         onImportConsumed = onImportConsumed,
                         requestedInsertForm = requestedInsertForm,
                         onInsertConsumed = onInsertConsumed,
+                        requestedEditKey = requestedEditKey,
+                        onEditKeyConsumed = onEditKeyConsumed,
                     )
                     false -> ReminderOnboardingScreen(
                         onFinished = reminderOnboarding::finish,

app/src/main/java/de/jeanlucmakiola/calendula/ui/edit/EventEditScreen.kt

@@ -89,6 +89,7 @@ import androidx.compose.ui.graphics.isSpecified
 import androidx.compose.ui.graphics.Shape
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.AnnotatedString
 import androidx.compose.ui.text.TextStyle
@@ -182,12 +183,14 @@ fun EventEditScreen(
     editKey: LongArray? = null,
     initialStartMinutes: Int? = null,
     initialForm: EventForm? = null,
+    initialFormSource: ImportSource = ImportSource.File,
     viewModel: EventEditViewModel = hiltViewModel(),
 ) {
     LaunchedEffect(initialDateIso, editKey, initialForm) {
         when {
-            // Single-event .ics open: the form arrives prefilled for review.
-            initialForm != null -> viewModel.openImported(initialForm)
+            // A prefilled open: a single-event .ics for review, or an external
+            // ACTION_INSERT intent. The source drives how reminders are seeded.
+            initialForm != null -> viewModel.openImported(initialForm, initialFormSource)
             editKey != null -> viewModel.openForEdit(
                 eventId = editKey[0],
                 beginMillis = editKey[1],
@@ -202,6 +205,7 @@ fun EventEditScreen(
     }
     val state by viewModel.state.collectAsStateWithLifecycle()
     val loadFailed by viewModel.loadFailed.collectAsStateWithLifecycle()
+    val importReminderPrompt by viewModel.importReminderPrompt.collectAsStateWithLifecycle()
 
     // The form is intentionally forgotten on every close (cancel or save) so
     // the next open starts clean; it survives rotation because openNew /
@@ -332,6 +336,56 @@ fun EventEditScreen(
             },
         )
     }
+
+    // A .ics import respects the file's reminders, but offers to swap in the
+    // configured default rather than silently deciding for the user (#49).
+    importReminderPrompt?.let { prompt ->
+        ImportReminderPromptDialog(
+            currentReminderCount = prompt.currentReminderCount,
+            onApply = viewModel::applyImportedReminderDefault,
+            onKeep = viewModel::dismissImportedReminderPrompt,
+        )
+    }
+}
+
+/**
+ * Offer to apply the settings default reminder to an event opened from a `.ics`
+ * file. The file's own reminders are kept unless the user accepts. A plain
+ * two-choice confirmation, so an [AlertDialog] (not a full-screen picker).
+ */
+@Composable
+private fun ImportReminderPromptDialog(
+    currentReminderCount: Int,
+    onApply: () -> Unit,
+    onKeep: () -> Unit,
+) {
+    AlertDialog(
+        onDismissRequest = onKeep,
+        title = { Text(stringResource(R.string.import_reminder_prompt_title)) },
+        text = {
+            Text(
+                if (currentReminderCount == 0) {
+                    stringResource(R.string.import_reminder_prompt_body_none)
+                } else {
+                    pluralStringResource(
+                        R.plurals.import_reminder_prompt_body_existing,
+                        currentReminderCount,
+                        currentReminderCount,
+                    )
+                },
+            )
+        },
+        confirmButton = {
+            TextButton(onClick = onApply) {
+                Text(stringResource(R.string.import_reminder_prompt_apply))
+            }
+        },
+        dismissButton = {
+            TextButton(onClick = onKeep) {
+                Text(stringResource(R.string.import_reminder_prompt_keep))
+            }
+        },
+    )
 }
 
 /**

app/src/main/java/de/jeanlucmakiola/calendula/ui/edit/EventEditViewModel.kt

@@ -21,6 +21,7 @@ import de.jeanlucmakiola.calendula.domain.RecurringWriteScope
 import de.jeanlucmakiola.calendula.domain.populatedFields
 import de.jeanlucmakiola.calendula.domain.problems
 import de.jeanlucmakiola.calendula.domain.toEditSnapshot
+import de.jeanlucmakiola.calendula.ui.detail.EventDetailViewModel.Companion.NO_OCCURRENCE_TIME
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.Flow
@@ -50,6 +51,36 @@ import kotlin.time.Duration.Companion.hours
 import kotlin.time.Instant
 import javax.inject.Inject
 
+/**
+ * Where a prefilled [EventEditViewModel.openImported] form came from — the two
+ * sources want different reminder handling (#49).
+ */
+enum class ImportSource {
+    /**
+     * An external `ACTION_INSERT` intent (another app/widget, e.g. Google Maps).
+     * It carries no reminders of its own, so the settings default is applied
+     * automatically, exactly like an in-app new event.
+     */
+    Insert,
+
+    /**
+     * A parsed single-event `.ics` file. Its own reminders are respected; the
+     * settings default is offered through [EventEditViewModel.importReminderPrompt]
+     * rather than silently applied or suppressed.
+     */
+    File,
+}
+
+/**
+ * A pending offer to swap an imported `.ics` event's reminders for the settings
+ * default (#49). [currentReminderCount] is what the file carried (0 or more);
+ * [defaultReminders] is what accepting would set.
+ */
+data class ImportReminderPrompt(
+    val currentReminderCount: Int,
+    val defaultReminders: List<Int>,
+)
+
 /**
  * Holds the event form being composed. The form's calendar id resolves to
  * (user pick > last used > first writable); the resolved value is what the UI
@@ -78,10 +109,16 @@ class EventEditViewModel @Inject constructor(
     // freezes the auto-applied default: switching calendars no longer overwrites
     // their choice. Reset with the form.
     private val _remindersTouched = MutableStateFlow(false)
+    // A one-time offer, raised when a .ics import opens, to replace the file's
+    // reminders with the settings default (#49). Null while there's nothing to ask.
+    private val _importReminderPrompt = MutableStateFlow<ImportReminderPrompt?>(null)
 
     /** True when the event to edit couldn't be loaded; the screen closes itself. */
     val loadFailed: StateFlow<Boolean> = _loadFailed.asStateFlow()
 
+    /** Pending "apply your default reminder?" offer for a `.ics` import; null when none. */
+    val importReminderPrompt: StateFlow<ImportReminderPrompt?> = _importReminderPrompt.asStateFlow()
+
     /**
      * The event being edited plus everything the form saw at load time.
      * For recurring events the write scope is chosen at save time; the
@@ -112,7 +149,17 @@ class EventEditViewModel @Inject constructor(
         val allDay: List<Int>,
         val timedOverrides: Map<Long, List<Int>>,
         val allDayOverrides: Map<Long, List<Int>>,
-    )
+    ) {
+        /** The default reminders for an event on [calendarId] of the given kind. */
+        fun resolveFor(calendarId: Long?, isAllDay: Boolean): List<Int> = resolveDefaultReminder(
+            timedGlobal = timed,
+            allDayGlobal = allDay,
+            timedOverrides = timedOverrides,
+            allDayOverrides = allDayOverrides,
+            calendarId = calendarId,
+            isAllDay = isAllDay,
+        )
+    }
 
     private data class ExternalInputs(
         val writable: List<CalendarSource>,
@@ -241,18 +288,39 @@ class EventEditViewModel @Inject constructor(
     }
 
     /**
-     * Seed a fresh event from a parsed `.ics` file (the single-event "open into
-     * the create form" path). [form] already carries the file's fields; its
-     * [EventForm.calendarId] is null so the calendar still resolves to the
-     * last-used/first-writable one, and reminders are frozen as touched so the
-     * settings default never overwrites what the file specified. No-op when a
-     * form is already open, so the prefill survives configuration changes.
+     * Seed a fresh event from a prefilled [form] — a parsed single-event `.ics`
+     * file ([ImportSource.File]) or an external `ACTION_INSERT` intent (another
+     * app/widget creating an event, e.g. Google Maps' "add to calendar";
+     * [ImportSource.Insert]; #30, #49). [EventForm.calendarId] is null so the
+     * calendar still resolves to the last-used/first-writable one.
+     *
+     * Reminders are handled per [source], because the two paths mean different
+     * things by "no reminders":
+     * - [ImportSource.Insert] carries no reminder semantics, so the settings
+     *   default is applied automatically like an in-app new event (a form that
+     *   somehow did carry reminders keeps them, frozen).
+     * - [ImportSource.File] owns its reminders, so they're frozen as-is; if a
+     *   settings default is configured and differs, [importReminderPrompt] offers
+     *   to swap it in rather than silently deciding for the user.
+     *
+     * No-op when a form is already open, so the prefill survives configuration
+     * changes.
      */
-    fun openImported(form: EventForm) {
+    fun openImported(form: EventForm, source: ImportSource) {
         if (_form.value != null || _editTarget.value != null) return
-        _remindersTouched.value = true
         _revealed.value = form.populatedFields()
         _form.value = form
+        when (source) {
+            ImportSource.Insert ->
+                if (form.reminders.isNotEmpty()) _remindersTouched.value = true
+                else applyDefaultReminder()
+
+            ImportSource.File -> {
+                // Respect the file's own reminders; never silently overwrite them.
+                _remindersTouched.value = true
+                maybePromptImportedReminderDefault(form)
+            }
+        }
     }
 
     /**
@@ -266,26 +334,12 @@ class EventEditViewModel @Inject constructor(
     private fun applyDefaultReminder(calendarId: Long? = null) {
         if (_editTarget.value != null || _remindersTouched.value) return
         viewModelScope.launch {
-            val defaults = combine(
-                settingsPrefs.defaultReminderMinutes,
-                settingsPrefs.defaultAllDayReminderMinutes,
-                settingsPrefs.perCalendarReminderOverride,
-                settingsPrefs.perCalendarAllDayReminderOverride,
-            ) { timed, allDay, timedOv, allDayOv ->
-                ReminderDefaults(timed, allDay, timedOv, allDayOv)
-            }.first()
+            val defaults = reminderDefaults()
             val targetId = calendarId ?: resolvedCalendarId.first()
             // Re-check after suspending: bail if the form closed or the user edited.
             val form = _form.value ?: return@launch
             if (_editTarget.value != null || _remindersTouched.value) return@launch
-            val reminders = resolveDefaultReminder(
-                timedGlobal = defaults.timed,
-                allDayGlobal = defaults.allDay,
-                timedOverrides = defaults.timedOverrides,
-                allDayOverrides = defaults.allDayOverrides,
-                calendarId = targetId,
-                isAllDay = form.isAllDay,
-            )
+            val reminders = defaults.resolveFor(targetId, form.isAllDay)
             _form.value = form.copy(reminders = reminders)
             // Surface the section so an auto-applied default is visible and
             // removable, even when Reminders isn't a default-shown field.
@@ -295,10 +349,60 @@ class EventEditViewModel @Inject constructor(
         }
     }
 
+    /** Snapshot the four settings-default reminder flows into one value. */
+    private suspend fun reminderDefaults(): ReminderDefaults = combine(
+        settingsPrefs.defaultReminderMinutes,
+        settingsPrefs.defaultAllDayReminderMinutes,
+        settingsPrefs.perCalendarReminderOverride,
+        settingsPrefs.perCalendarAllDayReminderOverride,
+    ) { timed, allDay, timedOv, allDayOv ->
+        ReminderDefaults(timed, allDay, timedOv, allDayOv)
+    }.first()
+
+    /**
+     * A `.ics` import respects the file's reminders, but an event opened from a
+     * file often has none while the user still expects their configured default.
+     * Rather than silently deciding, raise a one-time offer to swap in the
+     * settings default — but only when there's a real choice: a default is
+     * configured and it isn't already exactly what the file carried.
+     */
+    private fun maybePromptImportedReminderDefault(form: EventForm) {
+        viewModelScope.launch {
+            val targetId = resolvedCalendarId.first()
+            val default = reminderDefaults().resolveFor(targetId, form.isAllDay)
+            // Bail if the form closed or became an edit while we resolved.
+            val current = _form.value ?: return@launch
+            if (_editTarget.value != null) return@launch
+            if (default.isEmpty() || default == current.reminders) return@launch
+            _importReminderPrompt.value = ImportReminderPrompt(
+                currentReminderCount = current.reminders.size,
+                defaultReminders = default,
+            )
+        }
+    }
+
+    /** Accept the import prompt: replace the file's reminders with the default. */
+    fun applyImportedReminderDefault() {
+        val prompt = _importReminderPrompt.value ?: return
+        _importReminderPrompt.value = null
+        // Already frozen as touched by openImported; this just swaps the values.
+        update { it.copy(reminders = prompt.defaultReminders) }
+        _revealed.value = _revealed.value + EventFormField.Reminders
+    }
+
+    /** Decline the import prompt: keep the file's own reminders untouched. */
+    fun dismissImportedReminderPrompt() {
+        _importReminderPrompt.value = null
+    }
+
     /**
      * Load an existing event into the form. [beginMillis]/[endMillis] are the
-     * tapped occurrence's own times, like on the detail screen. No-op while a
-     * form is open, so user edits survive configuration changes.
+     * tapped occurrence's own times, like on the detail screen. An external
+     * "edit this event" (`ACTION_EDIT`) that names no occurrence passes
+     * [NO_OCCURRENCE_TIME]; the row's own DTSTART/DTEND is used then, so the
+     * form loads the event's real times instead of the epoch (mirrors the
+     * detail screen's #48 fallback). No-op while a form is open, so user edits
+     * survive configuration changes.
      */
     fun openForEdit(eventId: Long, beginMillis: Long, endMillis: Long) {
         if (_form.value != null || _editTarget.value != null) return
@@ -312,8 +416,12 @@ class EventEditViewModel @Inject constructor(
                 return@launch
             }
             val zone = TimeZone.currentSystemDefault()
-            val snapshot = detail.toEditSnapshot(beginMillis, endMillis, zone)
-            _editTarget.value = EditTarget(eventId, snapshot, beginMillis, endMillis, zone)
+            val begin = beginMillis.takeUnless { it == NO_OCCURRENCE_TIME }
+                ?: detail.instance.start.toEpochMilliseconds()
+            val end = endMillis.takeUnless { it == NO_OCCURRENCE_TIME }
+                ?: detail.instance.end.toEpochMilliseconds()
+            val snapshot = detail.toEditSnapshot(begin, end, zone)
+            _editTarget.value = EditTarget(eventId, snapshot, begin, end, zone)
             // Sections holding data must show even when not in the defaults.
             _revealed.value = snapshot.form.populatedFields()
             _form.value = snapshot.form
@@ -329,6 +437,7 @@ class EventEditViewModel @Inject constructor(
         _editTarget.value = null
         _loadFailed.value = false
         _remindersTouched.value = false
+        _importReminderPrompt.value = null
     }
 
     /** Unfold one optional field, picked in the "more fields" dialog. */

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

@@ -117,6 +117,16 @@
     <string name="event_edit_gone_title">Event deleted</string>
     <string name="event_edit_gone_body">This event was deleted in the meantime, for example on another device. Your changes can no longer be saved.</string>
 
+    <!-- Event form — apply default reminder to an imported .ics event (#49) -->
+    <string name="import_reminder_prompt_title">Apply your default reminder?</string>
+    <string name="import_reminder_prompt_body_none">This event was imported without any reminder.</string>
+    <plurals name="import_reminder_prompt_body_existing">
+        <item quantity="one">This event was imported with %1$d reminder.</item>
+        <item quantity="other">This event was imported with %1$d reminders.</item>
+    </plurals>
+    <string name="import_reminder_prompt_apply">Apply default</string>
+    <string name="import_reminder_prompt_keep">Keep as-is</string>
+
     <!-- Event form — recurrence picker (v1.3) -->
     <string name="event_edit_recurrence_none">Does not repeat</string>
     <string name="event_edit_recurrence_custom">Custom</string>