Add actions to search results (#80) (#167)

Reviewed-on: https://codeberg.org/jlmakiola/calendula/pulls/167

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/CalendarDataSource.kt

@@ -27,8 +27,10 @@ import de.jeanlucmakiola.calendula.domain.EventDetail
 import de.jeanlucmakiola.calendula.domain.curatedForPicker
 import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.EventSearch
 import de.jeanlucmakiola.calendula.domain.EventStatus
 import de.jeanlucmakiola.calendula.domain.Reminder
+import de.jeanlucmakiola.calendula.domain.SearchCandidate
 import de.jeanlucmakiola.calendula.domain.contacts.MANAGED_UID_PREFIX
 import de.jeanlucmakiola.calendula.domain.contacts.SpecialDateType
 import de.jeanlucmakiola.calendula.domain.ics.IcsEvent
@@ -62,12 +64,14 @@ interface CalendarDataSource {
     fun eventDetail(eventId: Long, allDayReminderTimeMinutes: Int): EventDetail?
 
     /**
-     * Master/one-off events whose title, description or location contains
-     * [query] (case-insensitive), across all calendars, newest first. Reads the
-     * Events table directly so the search is unbounded in time; exception rows
-     * are excluded (see [SearchProjection]). [query] is assumed non-blank.
+     * Master/one-off events that may match [query], across all calendars: every
+     * whitespace-separated token has to appear in the title, description or
+     * location. Reads the Events table directly so the search is unbounded in
+     * time; exception rows are excluded (see [SearchProjection]). A deliberate
+     * superset — [EventSearch] makes the final call and orders the hits.
+     * [query] is assumed non-blank.
      */
-    fun searchEvents(query: String): List<EventInstance>
+    fun searchEvents(query: String): List<SearchCandidate>
 
     /**
      * The event-colour palette the calendar's account publishes
@@ -585,20 +589,23 @@ class AndroidCalendarDataSource @Inject constructor(
         )?.use { c -> c.mapAllNotNull { CursorColumnReader(c).toEventInstance() } } ?: emptyList()
     }
 
-    override fun searchEvents(query: String): List<EventInstance> {
+    override fun searchEvents(query: String): List<SearchCandidate> {
         ensureObserversRegistered()
-        val trimmed = query.trim()
-        if (trimmed.isEmpty()) return emptyList()
-        // Escape the SQL LIKE wildcards so a literal % or _ in the query matches
-        // itself instead of acting as a wildcard.
-        val escaped = trimmed
-            .replace("\\", "\\\\")
-            .replace("%", "\\%")
-            .replace("_", "\\_")
-        val like = "%$escaped%"
-        val match = "${CalendarContract.Events.TITLE} LIKE ? ESCAPE '\\' OR " +
+        val tokens = EventSearch.tokenize(query).take(MAX_SEARCH_TOKENS)
+        if (tokens.isEmpty()) return emptyList()
+        // Only a pre-filter: EventSearch re-checks every token, including the
+        // ones the cap above dropped.
+        val patterns = tokens.map { likePatterns(it) }
+        val match = patterns.joinToString(" AND ") { variants ->
+            variants.joinToString(" OR ", prefix = "(", postfix = ")") {
+                "${CalendarContract.Events.TITLE} LIKE ? ESCAPE '\\' OR " +
                     "${CalendarContract.Events.DESCRIPTION} LIKE ? ESCAPE '\\' OR " +
                     "${CalendarContract.Events.EVENT_LOCATION} LIKE ? ESCAPE '\\'"
+            }
+        }
+        val args = patterns
+            .flatMap { variants -> variants.flatMap { pattern -> List(3) { pattern } } }
+            .toTypedArray()
         val selection = "($match) AND " +
             "${CalendarContract.Events.DELETED} = 0 AND " +
             "${CalendarContract.Events.ORIGINAL_ID} IS NULL"
@@ -606,19 +613,17 @@ class AndroidCalendarDataSource @Inject constructor(
             CalendarContract.Events.CONTENT_URI,
             SearchProjection.COLUMNS,
             selection,
-            arrayOf(like, like, like),
+            args,
             CalendarContract.Events.DTSTART + " DESC",
         )?.use { c ->
             val reader = CursorColumnReader(c)
-            val out = ArrayList<EventInstance>(c.count)
+            val out = ArrayList<SearchCandidate>(c.count)
             while (c.moveToNext()) {
+                val description = reader.getString(SearchProjection.IDX_DESCRIPTION)
                 val base = reader.toSearchResult() ?: continue
-                // A recurring master's DTSTART is the series start; show its
-                // nearest occurrence instead so the date is the one the user
-                // actually cares about (and sorting reflects it).
-                val recurring = !reader.getString(SearchProjection.IDX_RRULE).isNullOrEmpty() ||
-                    !reader.getString(SearchProjection.IDX_RDATE).isNullOrEmpty()
-                out += if (recurring) {
+                // A recurring master's DTSTART is the series start; date the row
+                // by its nearest occurrence instead.
+                val event = if (base.isRecurring) {
                     nearestOccurrenceMillis(base.eventId)?.let { (begin, end) ->
                         base.copy(
                             start = begin.toKotlinInstantFromEpochMillis(),
@@ -628,11 +633,44 @@ class AndroidCalendarDataSource @Inject constructor(
                 } else {
                     base
                 }
+                // The raw title, so matching can't catch on the placeholder an
+                // untitled event is drawn with.
+                out += SearchCandidate(
+                    event = event,
+                    description = description,
+                    title = reader.getString(SearchProjection.IDX_TITLE),
+                )
             }
             out
         } ?: emptyList()
     }
 
+    /**
+     * One token as the `LIKE` patterns to OR together. SQLite folds case for
+     * ASCII only, so a token with cased non-ASCII letters is also queried lower-,
+     * upper- and title-cased, which is how "ärzte" reaches "Ärzte". Wildcarding
+     * those letters away instead would make "москва" `%______%` — a full scan.
+     */
+    private fun likePatterns(token: String): List<String> {
+        if (token.none { it.code > 127 && (it.isUpperCase() || it.isLowerCase()) }) {
+            return listOf(likePattern(token))
+        }
+        val lower = token.lowercase()
+        return listOf(token, lower, token.uppercase(), lower.replaceFirstChar(Char::uppercaseChar))
+            .distinct()
+            .map(::likePattern)
+    }
+
+    private fun likePattern(token: String): String {
+        val sb = StringBuilder("%")
+        for (c in token) {
+            // A literal wildcard from the query matches itself.
+            if (c == '%' || c == '_' || c == '\\') sb.append('\\')
+            sb.append(c)
+        }
+        return sb.append('%').toString()
+    }
+
     /**
      * The occurrence of [eventId] nearest to now: the soonest upcoming one
      * within [OCCURRENCE_WINDOW_MILLIS] ahead, else the most recent past one
@@ -1593,5 +1631,12 @@ class AndroidCalendarDataSource @Inject constructor(
          * next fires beyond it falls back to its series-start date.
          */
         const val OCCURRENCE_WINDOW_MILLIS = 2L * 365 * 24 * 60 * 60 * 1000
+
+        /**
+         * Tokens the SQL pre-filter is built from. Bounds the statement for a
+         * pasted paragraph; the ranker still requires every token, so a capped
+         * search returns fewer rows to check, never more hits.
+         */
+        const val MAX_SEARCH_TOKENS = 8
     }
 }

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/CalendarRepository.kt

@@ -5,6 +5,7 @@ import de.jeanlucmakiola.calendula.domain.EventColorOption
 import de.jeanlucmakiola.calendula.domain.EventDetail
 import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.SearchCandidate
 import de.jeanlucmakiola.calendula.domain.ics.IcsEvent
 import de.jeanlucmakiola.calendula.domain.ics.IcsImportSummary
 import de.jeanlucmakiola.calendula.domain.ics.ParsedIcsEvent
@@ -17,11 +18,11 @@ interface CalendarRepository {
     suspend fun eventDetail(eventId: Long): EventDetail
 
     /**
-     * Events whose title, description or location contains [query], with hidden
-     * calendars removed and newest first. Empty when [query] is blank. Searches
-     * the whole history/future (see [CalendarDataSource.searchEvents]).
+     * Candidate matches for [query] with hidden calendars removed; empty when
+     * [query] is blank. Searches the whole history/future and leaves matching
+     * and ranking to [de.jeanlucmakiola.calendula.domain.EventSearch].
      */
-    suspend fun searchEvents(query: String): List<EventInstance>
+    suspend fun searchEvents(query: String): List<SearchCandidate>
 
     /**
      * The event-colour palette a calendar's account publishes; empty when it

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/CalendarRepositoryImpl.kt

@@ -9,6 +9,7 @@ import de.jeanlucmakiola.calendula.domain.EventColorOption
 import de.jeanlucmakiola.calendula.domain.EventDetail
 import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.SearchCandidate
 import de.jeanlucmakiola.calendula.domain.ics.IcsImportSummary
 import de.jeanlucmakiola.calendula.domain.ics.ParsedIcsEvent
 import kotlinx.coroutines.CoroutineDispatcher
@@ -162,13 +163,13 @@ class CalendarRepositoryImpl @Inject constructor(
             ?: throw NoSuchEventException(eventId)
     }
 
-    override suspend fun searchEvents(query: String): List<EventInstance> = withContext(io) {
+    override suspend fun searchEvents(query: String): List<SearchCandidate> = withContext(io) {
         if (query.isBlank()) return@withContext emptyList()
         val excluded = prefs.hiddenCalendarIds.first() +
             prefs.pendingDisabledCalendarIds.first() +
             invisibleCalendarIds()
         dataSource.searchEvents(query)
-            .let { if (excluded.isEmpty()) it else it.filterNot { e -> e.calendarId in excluded } }
+            .let { if (excluded.isEmpty()) it else it.filterNot { c -> c.event.calendarId in excluded } }
     }
 
     override suspend fun eventColorPalette(calendarId: Long): List<EventColorOption> =

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/Projections.kt

@@ -180,6 +180,8 @@ internal object SearchProjection {
         // display its nearest occurrence, not the series-start DTSTART.
         CalendarContract.Events.RRULE,
         CalendarContract.Events.RDATE,
+        // Excerpted, not just filtered on: a hit has to show what it matched.
+        CalendarContract.Events.DESCRIPTION,
     )
 
     const val IDX_ID = 0
@@ -194,6 +196,7 @@ internal object SearchProjection {
     const val IDX_LOCATION = 9
     const val IDX_RRULE = 10
     const val IDX_RDATE = 11
+    const val IDX_DESCRIPTION = 12
 }
 
 /**

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/SearchMapper.kt

@@ -40,5 +40,7 @@ internal fun ColumnReader.toSearchResult(): EventInstance? {
         isAllDay = getInt(SearchProjection.IDX_ALL_DAY) != 0,
         color = color,
         location = getString(SearchProjection.IDX_LOCATION),
+        isRecurring = !getString(SearchProjection.IDX_RRULE).isNullOrEmpty() ||
+            !getString(SearchProjection.IDX_RDATE).isNullOrEmpty(),
     )
 }

app/src/main/java/de/jeanlucmakiola/calendula/domain/EventSearch.kt

@@ -0,0 +1,256 @@
+package de.jeanlucmakiola.calendula.domain
+
+import kotlinx.datetime.DateTimeUnit
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.atStartOfDayIn
+import kotlinx.datetime.number
+import kotlinx.datetime.plus
+import kotlinx.datetime.toLocalDateTime
+import kotlin.time.Instant
+
+/** An event with the free text the search may have matched it on. */
+data class SearchCandidate(
+    val event: EventInstance,
+    val description: String? = null,
+    /** Null when the event has none: [EventInstance.title] is then a display
+     *  placeholder, which the query must not catch on. */
+    val title: String? = event.title,
+)
+
+/** A matched run inside one of a hit's texts, for highlighting. */
+data class MatchSpan(val start: Int, val end: Int)
+
+/** The part of a description a token matched, elided to what fits a row. */
+data class DescriptionSnippet(
+    val text: String,
+    val spans: List<MatchSpan>,
+)
+
+/** One result: the event, plus where the query matched it. */
+data class SearchHit(
+    val event: EventInstance,
+    val titleSpans: List<MatchSpan> = emptyList(),
+    val locationSpans: List<MatchSpan> = emptyList(),
+    val descriptionSnippet: DescriptionSnippet? = null,
+    /** Already over, so the row can say so. Finished-today counts. */
+    val isPast: Boolean = false,
+)
+
+/** One month's worth of hits, as the results list draws them under a header. */
+data class SearchMonth(
+    val year: Int,
+    /** 1–12, so the UI can build the month's first day for a localized label. */
+    val monthNumber: Int,
+    val hits: List<SearchHit>,
+)
+
+/** A finished search: a calendar of hits, plus the description-only ones. */
+data class SearchResults(
+    val months: List<SearchMonth>,
+    val inDescriptions: List<SearchHit>,
+) {
+    val isEmpty: Boolean get() = months.isEmpty() && inDescriptions.isEmpty()
+
+    /** Every hit, whichever section it sits in — for select-all and delete. */
+    val allHits: List<SearchHit> get() = months.flatMap { it.hits } + inDescriptions
+}
+
+/**
+ * Turning a typed query into the results list.
+ *
+ * An event has to carry *every* whitespace-separated token, each in any of
+ * title / location / description; case is folded in Kotlin rather than by SQL's
+ * ASCII-only `LIKE`, so "ärzte" finds "Ärzte".
+ *
+ * Results are a calendar, not a ranking: months from the current one, then
+ * forwards, then backwards, and inside a month what is still to come before
+ * what has passed. The day is the boundary, not the moment. A hit the query
+ * only reached through its description is held back in
+ * [SearchResults.inDescriptions] rather than dated among the real ones.
+ */
+object EventSearch {
+
+    /** Characters of description kept around the match in a row's snippet. */
+    private const val SNIPPET_LENGTH = 96
+
+    /** Characters of lead-in shown before the match, when there is room. */
+    private const val SNIPPET_LEAD = 24
+
+    private val WHITESPACE = Regex("\\s+")
+
+    /** Shared with the data layer so its SQL pre-filter tokenises identically. */
+    fun tokenize(query: String): List<String> =
+        query.trim().split(WHITESPACE).filter { it.isNotEmpty() }
+
+    /**
+     * Search [candidates] for [query], dropping any that don't carry every token.
+     * [now] marks a hit as over, [todayStart] is where it stops being current.
+     * [zone] places each event on the calendar through the span rule, so an
+     * all-day event keeps its own day whichever side of UTC we are on (#82).
+     */
+    fun search(
+        candidates: List<SearchCandidate>,
+        query: String,
+        now: Instant,
+        todayStart: Instant,
+        zone: TimeZone,
+    ): SearchResults {
+        val tokens = tokenize(query)
+        if (tokens.isEmpty()) return SearchResults(emptyList(), emptyList())
+
+        val today = todayStart.toLocalDateTime(zone).date
+        val matched = candidates.mapNotNull { candidate -> match(candidate, tokens, now, zone) }
+        val upcoming = { m: Matched -> m.event.spanLastDay(zone) >= today }
+        val order = compareBy<Matched> { if (upcoming(it)) 0 else 1 }
+            .thenComparator { a, b ->
+                // What is left reads forwards; what is behind us reads backwards
+                // from today, nearest first.
+                if (upcoming(a)) {
+                    a.event.dayStart(zone).compareTo(b.event.dayStart(zone))
+                } else {
+                    b.event.dayStart(zone).compareTo(a.event.dayStart(zone))
+                }
+            }
+
+        val (inDescriptions, dated) = matched.sortedWith(order).partition { it.descriptionOnly }
+        return SearchResults(
+            months = groupByMonth(dated, zone, todayStart),
+            inDescriptions = inDescriptions.map { it.hit },
+        )
+    }
+
+    /** Months from the current one, then forwards, then backwards. */
+    private fun groupByMonth(
+        dated: List<Matched>,
+        zone: TimeZone,
+        todayStart: Instant,
+    ): List<SearchMonth> {
+        val currentKey = monthKey(todayStart.toLocalDateTime(zone).date)
+        return dated
+            .groupBy { monthKey(it.event.spanFirstDay(zone)) }
+            .entries
+            .sortedWith(
+                compareBy<Map.Entry<Int, List<Matched>>> {
+                    when {
+                        it.key == currentKey -> 0
+                        it.key > currentKey -> 1
+                        else -> 2
+                    }
+                }.thenComparator { a, b ->
+                    if (a.key > currentKey) a.key.compareTo(b.key) else b.key.compareTo(a.key)
+                },
+            )
+            .map { (key, entries) ->
+                SearchMonth(
+                    year = key / 12,
+                    monthNumber = key % 12 + 1,
+                    hits = entries.map { it.hit },
+                )
+            }
+    }
+
+    /** Year and month as one comparable number. */
+    private fun monthKey(date: LocalDate): Int = date.year * 12 + (date.month.number - 1)
+
+    private fun match(
+        candidate: SearchCandidate,
+        tokens: List<String>,
+        now: Instant,
+        zone: TimeZone,
+    ): Matched? {
+        val title = candidate.title?.takeIf { it.isNotBlank() }
+        val location = candidate.event.location?.takeIf { it.isNotBlank() }
+        // Collapsed so a multi-line description matches the way it is drawn.
+        val description = candidate.description
+            ?.replace(WHITESPACE, " ")
+            ?.trim()
+            ?.takeIf { it.isNotEmpty() }
+
+        // Mid-word counts: "termin" has to keep finding "Zahnarzttermin".
+        val present = { token: String ->
+            title?.contains(token, ignoreCase = true) == true ||
+                location?.contains(token, ignoreCase = true) == true ||
+                description?.contains(token, ignoreCase = true) == true
+        }
+        if (!tokens.all(present)) return null
+
+        val descriptionSpans = description?.let { spansIn(it, tokens) }.orEmpty()
+        val titleSpans = title?.let { spansIn(it, tokens) }.orEmpty()
+        val locationSpans = location?.let { spansIn(it, tokens) }.orEmpty()
+        return Matched(
+            hit = SearchHit(
+                event = candidate.event,
+                titleSpans = titleSpans,
+                locationSpans = locationSpans,
+                descriptionSnippet = description
+                    ?.takeIf { descriptionSpans.isNotEmpty() }
+                    ?.let { snippet(it, descriptionSpans) },
+                isPast = candidate.event.dayEnd(zone) < now,
+            ),
+            // Nothing in the name or the place caught the query: it is only here
+            // for something in its notes.
+            descriptionOnly = titleSpans.isEmpty() && locationSpans.isEmpty(),
+        )
+    }
+
+    /** Every occurrence of every token in [text], merged where they overlap. */
+    private fun spansIn(text: String, tokens: List<String>): List<MatchSpan> {
+        val raw = mutableListOf<MatchSpan>()
+        for (token in tokens) {
+            var index = text.indexOf(token, startIndex = 0, ignoreCase = true)
+            while (index >= 0) {
+                raw += MatchSpan(index, index + token.length)
+                index = text.indexOf(token, startIndex = index + 1, ignoreCase = true)
+            }
+        }
+        if (raw.isEmpty()) return emptyList()
+        val sorted = raw.sortedBy { it.start }
+        val merged = mutableListOf(sorted.first())
+        for (span in sorted.drop(1)) {
+            val last = merged.last()
+            if (span.start <= last.end) {
+                merged[merged.lastIndex] = MatchSpan(last.start, maxOf(last.end, span.end))
+            } else {
+                merged += span
+            }
+        }
+        return merged
+    }
+
+    /**
+     * A window of [description] around its first match, elided at both ends,
+     * with the spans rebased onto it and any falling outside dropped.
+     */
+    private fun snippet(description: String, spans: List<MatchSpan>): DescriptionSnippet {
+        if (description.length <= SNIPPET_LENGTH) {
+            return DescriptionSnippet(description, spans)
+        }
+        val first = spans.first().start
+        val start = (first - SNIPPET_LEAD).coerceIn(0, (description.length - SNIPPET_LENGTH))
+        val end = (start + SNIPPET_LENGTH).coerceAtMost(description.length)
+        val prefix = if (start > 0) "…" else ""
+        val suffix = if (end < description.length) "…" else ""
+        val text = prefix + description.substring(start, end) + suffix
+        val shift = prefix.length - start
+        val rebased = spans
+            .filter { it.start >= start && it.end <= end }
+            .map { MatchSpan(it.start + shift, it.end + shift) }
+        return DescriptionSnippet(text, rebased)
+    }
+
+    private data class Matched(val hit: SearchHit, val descriptionOnly: Boolean) {
+        val event: EventInstance get() = hit.event
+    }
+
+    /**
+     * The event's first day as an instant in [zone]. An all-day event sits at
+     * UTC midnight, so its raw start would rank it on a day it isn't drawn on.
+     */
+    private fun EventInstance.dayStart(zone: TimeZone): Instant =
+        if (isAllDay) spanFirstDay(zone).atStartOfDayIn(zone) else start
+
+    /** The moment the event's last day is over in [zone], exclusive. */
+    private fun EventInstance.dayEnd(zone: TimeZone): Instant =
+        if (isAllDay) spanLastDay(zone).plus(1, DateTimeUnit.DAY).atStartOfDayIn(zone) else end
+}

app/src/main/java/de/jeanlucmakiola/calendula/domain/Models.kt

@@ -62,6 +62,11 @@ data class EventInstance(
     val isAllDay: Boolean,
     val color: Int,
     val location: String?,
+    /**
+     * Only search results, which read the series master, fill this in — the
+     * Instances query already yields one row per occurrence.
+     */
+    val isRecurring: Boolean = false,
 )
 
 /**

app/src/main/java/de/jeanlucmakiola/calendula/ui/search/SearchScreen.kt

@@ -1,67 +1,108 @@
 package de.jeanlucmakiola.calendula.ui.search
 
+import android.Manifest
+import android.content.pm.PackageManager
+import androidx.activity.compose.BackHandler
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.animation.AnimatedContent
+import androidx.compose.animation.animateColorAsState
 import androidx.compose.foundation.background
 import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.imePadding
+import androidx.compose.foundation.layout.navigationBarsPadding
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.LazyListScope
 import androidx.compose.foundation.lazy.itemsIndexed
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material.icons.filled.Close
+import androidx.compose.material.icons.filled.Delete
 import androidx.compose.material.icons.filled.SearchOff
+import androidx.compose.material.icons.filled.SelectAll
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.Checkbox
 import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.ExperimentalMaterial3ExpressiveApi
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
 import androidx.compose.material3.TopAppBar
 import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.focus.FocusRequester
 import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalSoftwareKeyboardController
+import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.text.SpanStyle
+import androidx.compose.ui.text.buildAnnotatedString
+import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.input.ImeAction
 import androidx.compose.ui.text.input.KeyboardCapitalization
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
+import androidx.core.content.ContextCompat
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import de.jeanlucmakiola.calendula.R
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.MatchSpan
+import de.jeanlucmakiola.calendula.domain.RecurringWriteScope
+import de.jeanlucmakiola.calendula.domain.SearchHit
+import de.jeanlucmakiola.calendula.domain.SearchMonth
 import de.jeanlucmakiola.floret.identity.animateItemMotion
+import de.jeanlucmakiola.floret.identity.fadeThrough
 import de.jeanlucmakiola.floret.identity.predictiveBack
 import de.jeanlucmakiola.floret.components.GroupedRow
 import de.jeanlucmakiola.floret.components.InlineTextField
 import de.jeanlucmakiola.floret.components.Position
+import de.jeanlucmakiola.floret.components.SnackChip
+import de.jeanlucmakiola.floret.components.SnackChipHeight
+import de.jeanlucmakiola.floret.components.SnackChipMargin
 import de.jeanlucmakiola.floret.locale.currentLocale
+import de.jeanlucmakiola.floret.locale.localizedDateFormatter
+import de.jeanlucmakiola.calendula.ui.common.EventDimAlpha
 import de.jeanlucmakiola.calendula.ui.common.LocalSoftenColors
+import de.jeanlucmakiola.calendula.ui.common.RecurringScopeDialog
 import de.jeanlucmakiola.calendula.ui.common.eventAccent
 import de.jeanlucmakiola.calendula.ui.common.eventFill
 import de.jeanlucmakiola.calendula.domain.spanFirstDay
 import de.jeanlucmakiola.calendula.ui.common.LocalUse24HourFormat
 import de.jeanlucmakiola.calendula.ui.common.timeOfDayFormatter
 import de.jeanlucmakiola.floret.components.positionOf
+import kotlinx.coroutines.delay
 import kotlinx.datetime.TimeZone
 import kotlinx.datetime.toJavaLocalDate
 import java.time.Instant as JavaInstant
@@ -69,11 +110,13 @@ import java.time.ZoneId
 import java.time.format.DateTimeFormatter
 import java.time.format.FormatStyle
 
+/** How long the delete confirmation chip stays up, matching a short snackbar. */
+private const val CHIP_MILLIS = 4_000L
+
 /**
- * Full-text event search (top-bar entry). Type a query → matching events
- * (title / location / description) across the whole calendar, newest-relevant
- * first; tap a result to open its detail. A full-screen overlay hosted by
- * [de.jeanlucmakiola.calendula.ui.CalendarHost].
+ * Full-text event search over title / location / description: tap a result to
+ * open its detail, long-press to select several and delete them at once (#80).
+ * A full-screen overlay hosted by [de.jeanlucmakiola.calendula.ui.CalendarHost].
  */
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -85,63 +128,79 @@ fun SearchScreen(
 ) {
     val query by viewModel.query.collectAsStateWithLifecycle()
     val state by viewModel.state.collectAsStateWithLifecycle()
+    val selection by viewModel.selection.collectAsStateWithLifecycle()
+    val deleteState by viewModel.deleteState.collectAsStateWithLifecycle()
     val focusRequester = remember { FocusRequester() }
     val keyboard = LocalSoftwareKeyboardController.current
+    val context = LocalContext.current
+    val inSelection = selection.isNotEmpty()
+    var showDeleteDialog by remember { mutableStateOf(false) }
 
-    // Each fresh open starts blank and straight into typing. The ViewModel is
-    // activity-scoped so it outlives the overlay; clearing on (re)enter is what
-    // resets a previous search. Peeking a result doesn't re-run this (the screen
-    // stays composed under the detail), so backing out keeps the query.
+    // The ViewModel is activity-scoped, so a re-enter is what resets the last
+    // search, its selection and any delete receipt still up. Peeking a result
+    // doesn't re-run this — the screen stays composed under the detail.
     LaunchedEffect(Unit) {
         viewModel.setQuery("")
+        viewModel.clearSelection()
+        viewModel.consumeDeleteResult()
+    }
+    // The field only exists out of selection mode, so a recreation that lands
+    // mid-selection has to wait for the clear above before it can be focused.
+    var focusPending by remember { mutableStateOf(true) }
+    LaunchedEffect(inSelection) {
+        if (inSelection || !focusPending) return@LaunchedEffect
+        focusPending = false
         focusRequester.requestFocus()
         keyboard?.show()
     }
+
+    // Same in-place WRITE_CALENDAR upgrade the detail screen does: a v1.0 install
+    // holds only READ_CALENDAR, and granting continues into the held delete.
+    var pendingWrite by remember { mutableStateOf<(() -> Unit)?>(null) }
+    val writePermissionLauncher = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.RequestPermission(),
+    ) { granted ->
+        if (granted) pendingWrite?.invoke()
+        pendingWrite = null
+    }
+    val requireWrite: (() -> Unit) -> Unit = { action ->
+        val granted = ContextCompat.checkSelfPermission(
+            context,
+            Manifest.permission.WRITE_CALENDAR,
+        ) == PackageManager.PERMISSION_GRANTED
+        if (granted) {
+            action()
+        } else {
+            pendingWrite = action
+            writePermissionLauncher.launch(Manifest.permission.WRITE_CALENDAR)
+        }
+    }
+
+    // Back leaves selection mode before it leaves the screen, and without the
+    // predictive-back scale-out — that would read as search closing and snapping
+    // back. The two handlers are mutually exclusive on [inSelection].
+    BackHandler(enabled = inSelection) { viewModel.clearSelection() }
+
     Scaffold(
-        modifier = modifier.predictiveBack(onBack = onBack),
+        modifier = modifier.predictiveBack(onBack = onBack, enabled = !inSelection),
         containerColor = MaterialTheme.colorScheme.surface,
         topBar = {
-            TopAppBar(
-                title = {
-                    InlineTextField(
-                        value = query,
-                        onValueChange = viewModel::setQuery,
-                        placeholder = stringResource(R.string.search_hint),
-                        capitalization = KeyboardCapitalization.None,
-                        imeAction = ImeAction.Search,
+            SearchTopBar(
+                inSelection = inSelection,
+                query = query,
+                selectedCount = selection.size,
+                focusRequester = focusRequester,
+                onQueryChange = viewModel::setQuery,
                 onImeAction = { keyboard?.hide() },
-                        modifier = Modifier
-                            .fillMaxWidth()
-                            .focusRequester(focusRequester),
-                    )
-                },
-                navigationIcon = {
-                    IconButton(onClick = onBack) {
-                        Icon(
-                            imageVector = Icons.AutoMirrored.Filled.ArrowBack,
-                            contentDescription = stringResource(R.string.search_back),
-                        )
-                    }
-                },
-                actions = {
-                    if (query.isNotEmpty()) {
-                        IconButton(onClick = { viewModel.setQuery("") }) {
-                            Icon(
-                                imageVector = Icons.Default.Close,
-                                contentDescription = stringResource(R.string.search_clear),
-                            )
-                        }
-                    }
-                },
-                colors = TopAppBarDefaults.topAppBarColors(
-                    containerColor = MaterialTheme.colorScheme.surface,
-                ),
+                onBack = onBack,
+                onCloseSelection = viewModel::clearSelection,
+                onSelectAll = viewModel::selectAll,
+                onDelete = { requireWrite { showDeleteDialog = true } },
             )
         },
     ) { padding ->
-        // imePadding shrinks the content by the keyboard, so the centered
-        // idle/empty message re-centres in the space above it (and the results
-        // list lifts clear of the keyboard too).
+        // imePadding so the idle/empty message re-centres above the keyboard and
+        // the results list lifts clear of it.
         Box(
             modifier = Modifier
                 .fillMaxSize()
@@ -158,52 +217,314 @@ fun SearchScreen(
                     text = stringResource(R.string.search_empty, s.query),
                 )
                 is SearchUiState.Results -> SearchResults(
-                    events = s.events,
+                    results = s,
+                    selection = selection,
+                    inSelection = inSelection,
                     onEventClick = onEventClick,
+                    onToggle = viewModel::toggleSelection,
                 )
             }
+            DeleteOutcomeChip(
+                deleteState = deleteState,
+                onConsume = viewModel::consumeDeleteResult,
+                modifier = Modifier.align(Alignment.BottomStart),
+            )
+        }
+    }
+
+    if (showDeleteDialog) {
+        val count = selection.size
+        // One decision for the whole batch: the scope question is only asked when
+        // a recurring event is in it, and one-offs ignore whatever comes back.
+        if (viewModel.selectionHasRecurring()) {
+            RecurringScopeDialog(
+                title = stringResource(R.string.event_delete_recurring_title),
+                onSelect = { scope ->
+                    showDeleteDialog = false
+                    viewModel.deleteSelected(scope)
+                },
+                onDismiss = { showDeleteDialog = false },
+            )
+        } else {
+            AlertDialog(
+                onDismissRequest = { showDeleteDialog = false },
+                title = {
+                    Text(pluralStringResource(R.plurals.search_delete_title, count, count))
+                },
+                text = { Text(stringResource(R.string.event_delete_body)) },
+                confirmButton = {
+                    TextButton(
+                        onClick = {
+                            showDeleteDialog = false
+                            viewModel.deleteSelected(RecurringWriteScope.AllEvents)
+                        },
+                    ) {
+                        Text(
+                            text = stringResource(R.string.event_detail_delete),
+                            color = MaterialTheme.colorScheme.error,
+                        )
+                    }
+                },
+                dismissButton = {
+                    TextButton(onClick = { showDeleteDialog = false }) {
+                        Text(stringResource(R.string.dialog_cancel))
+                    }
+                },
+            )
         }
     }
 }
 
+/**
+ * The search field and the contextual selection bar as one bar: the bar stays
+ * in place across the swap, easing its colour and fading its slots through.
+ */
+@OptIn(ExperimentalMaterial3Api::class, ExperimentalMaterial3ExpressiveApi::class)
+@Composable
+private fun SearchTopBar(
+    inSelection: Boolean,
+    query: String,
+    selectedCount: Int,
+    focusRequester: FocusRequester,
+    onQueryChange: (String) -> Unit,
+    onImeAction: () -> Unit,
+    onBack: () -> Unit,
+    onCloseSelection: () -> Unit,
+    onSelectAll: () -> Unit,
+    onDelete: () -> Unit,
+) {
+    val container by animateColorAsState(
+        targetValue = if (inSelection) {
+            MaterialTheme.colorScheme.surfaceContainerHigh
+        } else {
+            MaterialTheme.colorScheme.surface
+        },
+        animationSpec = MaterialTheme.motionScheme.fastEffectsSpec(),
+        label = "search-top-bar-color",
+    )
+    // Held past the selection emptying, so the count has something to draw while
+    // it fades out.
+    var lastCount by remember { mutableIntStateOf(0) }
+    if (selectedCount > 0) lastCount = selectedCount
+
+    // Read here so the non-composable transitionSpec lambdas can capture it.
+    val slotSwap = fadeThrough()
+
+    TopAppBar(
+        title = {
+            AnimatedContent(
+                targetState = inSelection,
+                transitionSpec = { slotSwap },
+                label = "search-top-bar-title",
+            ) { selecting ->
+                if (selecting) {
+                    Text(
+                        pluralStringResource(
+                            R.plurals.search_selected_count,
+                            lastCount,
+                            lastCount,
+                        ),
+                    )
+                } else {
+                    InlineTextField(
+                        value = query,
+                        onValueChange = onQueryChange,
+                        placeholder = stringResource(R.string.search_hint),
+                        capitalization = KeyboardCapitalization.None,
+                        imeAction = ImeAction.Search,
+                        onImeAction = onImeAction,
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .focusRequester(focusRequester),
+                    )
+                }
+            }
+        },
+        navigationIcon = {
+            AnimatedContent(
+                targetState = inSelection,
+                transitionSpec = { slotSwap },
+                label = "search-top-bar-navigation",
+            ) { selecting ->
+                if (selecting) {
+                    IconButton(onClick = onCloseSelection) {
+                        Icon(
+                            imageVector = Icons.Default.Close,
+                            contentDescription = stringResource(R.string.search_selection_close),
+                        )
+                    }
+                } else {
+                    IconButton(onClick = onBack) {
+                        Icon(
+                            imageVector = Icons.AutoMirrored.Filled.ArrowBack,
+                            contentDescription = stringResource(R.string.search_back),
+                        )
+                    }
+                }
+            }
+        },
+        actions = {
+            AnimatedContent(
+                targetState = inSelection,
+                transitionSpec = { slotSwap },
+                label = "search-top-bar-actions",
+            ) { selecting ->
+                Row {
+                    if (selecting) {
+                        IconButton(onClick = onSelectAll) {
+                            Icon(
+                                imageVector = Icons.Default.SelectAll,
+                                contentDescription = stringResource(R.string.search_select_all),
+                            )
+                        }
+                        IconButton(onClick = onDelete) {
+                            Icon(
+                                imageVector = Icons.Default.Delete,
+                                contentDescription = stringResource(
+                                    R.string.search_delete_selected,
+                                ),
+                                tint = MaterialTheme.colorScheme.error,
+                            )
+                        }
+                    } else if (query.isNotEmpty()) {
+                        IconButton(onClick = { onQueryChange("") }) {
+                            Icon(
+                                imageVector = Icons.Default.Close,
+                                contentDescription = stringResource(R.string.search_clear),
+                            )
+                        }
+                    }
+                }
+            }
+        },
+        colors = TopAppBarDefaults.topAppBarColors(containerColor = container),
+    )
+}
+
+@OptIn(ExperimentalFoundationApi::class)
 @Composable
 private fun SearchResults(
-    events: List<EventInstance>,
+    results: SearchUiState.Results,
+    selection: Set<Long>,
+    inSelection: Boolean,
     onEventClick: (EventInstance) -> Unit,
+    onToggle: (Long) -> Unit,
 ) {
     LazyColumn(
         modifier = Modifier.fillMaxSize(),
-        contentPadding = PaddingValues(start = 16.dp, end = 16.dp, top = 8.dp, bottom = 96.dp),
+        // No horizontal inset: GroupedRow already insets itself.
+        contentPadding = PaddingValues(top = 8.dp, bottom = 96.dp),
     ) {
-        itemsIndexed(
-            items = events,
-            key = { _, event -> event.eventId },
-        ) { index, event ->
-            SearchResultRow(
-                event = event,
-                position = positionOf(index, events.size),
-                modifier = animateItemMotion(),
-                onClick = { onEventClick(event) },
+        results.results.months.forEach { month ->
+            stickyHeader(key = "month-${month.year}-${month.monthNumber}") {
+                SearchSectionHeader(text = monthLabel(month))
+            }
+            hitRows(month.hits, results, selection, inSelection, onEventClick, onToggle)
+        }
+        // Held back from the calendar above: matched only in the notes.
+        if (results.results.inDescriptions.isNotEmpty()) {
+            stickyHeader(key = "in-descriptions") {
+                SearchSectionHeader(text = stringResource(R.string.search_in_descriptions))
+            }
+            hitRows(
+                results.results.inDescriptions,
+                results,
+                selection,
+                inSelection,
+                onEventClick,
+                onToggle,
             )
         }
     }
 }
 
+/** One section's rows, sharing a grouped-card run. */
+private fun LazyListScope.hitRows(
+    hits: List<SearchHit>,
+    results: SearchUiState.Results,
+    selection: Set<Long>,
+    inSelection: Boolean,
+    onEventClick: (EventInstance) -> Unit,
+    onToggle: (Long) -> Unit,
+) {
+    itemsIndexed(
+        items = hits,
+        key = { _, hit -> hit.event.eventId },
+    ) { index, hit ->
+        val event = hit.event
+        val deletable = results.isDeletable(event)
+        SearchResultRow(
+            hit = hit,
+            position = positionOf(index, hits.size),
+            modifier = animateItemMotion(),
+            selected = event.eventId in selection,
+            // A read-only calendar's row can't join a batch, so in selection
+            // mode it goes quiet rather than offering a checkbox that fails.
+            inSelection = inSelection,
+            selectable = deletable,
+            onClick = when {
+                inSelection && deletable -> ({ onToggle(event.eventId) })
+                inSelection -> null
+                else -> ({ onEventClick(event) })
+            },
+            onLongClick = { onToggle(event.eventId) }.takeIf { deletable && !inSelection },
+        )
+    }
+}
+
+/** Pinned section label, styled like the agenda's day headers. */
+@Composable
+private fun SearchSectionHeader(text: String) {
+    Surface(color = MaterialTheme.colorScheme.surface, modifier = Modifier.fillMaxWidth()) {
+        Text(
+            text = text,
+            style = MaterialTheme.typography.titleSmall,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+            modifier = Modifier.padding(start = 28.dp, end = 28.dp, top = 16.dp, bottom = 8.dp),
+        )
+    }
+}
+
+/** "August 2026" in the locale's own field order. */
+@Composable
+private fun monthLabel(month: SearchMonth): String {
+    val locale = currentLocale()
+    return remember(month.year, month.monthNumber, locale) {
+        localizedDateFormatter(locale, "LLLLy")
+            .format(java.time.LocalDate.of(month.year, month.monthNumber, 1))
+    }
+}
+
 @Composable
 private fun SearchResultRow(
-    event: EventInstance,
+    hit: SearchHit,
     position: Position,
     modifier: Modifier = Modifier,
-    onClick: () -> Unit,
+    selected: Boolean = false,
+    inSelection: Boolean = false,
+    selectable: Boolean = true,
+    onClick: (() -> Unit)?,
+    onLongClick: (() -> Unit)? = null,
 ) {
+    val event = hit.event
     val dark = isSystemInDarkTheme()
     val soften = LocalSoftenColors.current
+    // On a picked row the headline is already recoloured for the secondary
+    // container, so the match is carried by weight alone there.
+    val highlight = SpanStyle(
+        fontWeight = FontWeight.Bold,
+        color = if (selected) Color.Unspecified else MaterialTheme.colorScheme.primary,
+    )
     GroupedRow(
-        modifier = modifier,
-        title = event.title,
-        summary = searchSummary(event),
+        // Faded like a past event anywhere else in the app — search reaches back
+        // through the whole history.
+        modifier = if (hit.isPast) modifier.alpha(EventDimAlpha) else modifier,
+        title = marked(event.title, hit.titleSpans, highlight),
+        summary = searchSummary(hit, highlight),
         position = position,
         minHeight = 64.dp,
+        selected = selected,
+        dimmed = inSelection && !selectable,
         leading = {
             Box(
                 modifier = Modifier
@@ -212,21 +533,97 @@ private fun SearchResultRow(
                     .background(eventAccent(event.color, dark, soften)),
             )
         },
+        trailing = if (inSelection && selectable) {
+            {
+                Checkbox(
+                    checked = selected,
+                    onCheckedChange = null,
+                )
+            }
+        } else {
+            null
+        },
         onClick = onClick,
+        onLongClick = onLongClick,
     )
 }
 
-/** "Wed, 17 Jun 2026 · 09:00 · Office" — date, then time (or All day), then location. */
+/**
+ * The batch's receipt: how many went, and whether any refused. No Undo — the
+ * provider can't put a deleted event back.
+ */
 @Composable
-private fun searchSummary(event: EventInstance): String {
+private fun DeleteOutcomeChip(
+    deleteState: BulkDeleteUiState,
+    onConsume: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    val message = when (deleteState) {
+        is BulkDeleteUiState.Done -> when {
+            deleteState.failed > 0 -> stringResource(
+                R.string.search_delete_partial,
+                deleteState.deleted,
+                deleteState.failed,
+            )
+            else -> pluralStringResource(
+                R.plurals.search_delete_done,
+                deleteState.deleted,
+                deleteState.deleted,
+            )
+        }
+        is BulkDeleteUiState.NeedsPermission -> if (deleteState.deleted > 0) {
+            stringResource(R.string.search_delete_denied_partial, deleteState.deleted)
+        } else {
+            stringResource(R.string.event_delete_write_denied)
+        }
+        else -> null
+    }
+    // Held past the state being consumed so the chip has something to draw while
+    // it springs back out.
+    val shown = remember { mutableStateOf("") }
+    if (message != null && shown.value != message) shown.value = message
+
+    LaunchedEffect(deleteState) {
+        if (message == null) return@LaunchedEffect
+        delay(CHIP_MILLIS)
+        onConsume()
+    }
+    Box(
+        modifier = modifier
+            .navigationBarsPadding()
+            .padding(start = SnackChipMargin, bottom = SnackChipMargin)
+            .height(SnackChipHeight),
+        contentAlignment = Alignment.CenterStart,
+    ) {
+        SnackChip(visible = message != null, message = shown.value)
+    }
+}
+
+/** [text] with every matched run emphasised. */
+private fun marked(text: String, spans: List<MatchSpan>, style: SpanStyle): AnnotatedString =
+    if (spans.isEmpty()) {
+        AnnotatedString(text)
+    } else {
+        buildAnnotatedString {
+            append(text)
+            spans.forEach { addStyle(style, it.start, it.end) }
+        }
+    }
+
+/**
+ * "Wed, 17 Jun 2026 · 09:00 · Office", with a second line excerpting the
+ * description when that is where the query matched.
+ */
+@Composable
+private fun searchSummary(hit: SearchHit, highlight: SpanStyle): AnnotatedString {
+    val event = hit.event
     val locale = currentLocale()
     val zone = remember { ZoneId.systemDefault() }
     val start = remember(event.start, zone) {
         JavaInstant.ofEpochMilli(event.start.toEpochMilliseconds()).atZone(zone)
     }
-    // From the shared span rule, not [start]: an all-day event sits at UTC
-    // midnight and would name the day before west of UTC (#82). The clock time
-    // below stays device-zone — it is only rendered for timed events.
+    // From the span rule, not [start]: an all-day event sits at UTC midnight and
+    // would name the day before west of UTC (#82).
     val dateText = remember(event.start, event.end, event.isAllDay, locale) {
         DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM).withLocale(locale)
             .format(event.spanFirstDay(TimeZone.currentSystemDefault()).toJavaLocalDate())
@@ -237,8 +634,23 @@ private fun searchSummary(event: EventInstance): String {
     } else {
         remember(locale, use24Hour) { timeOfDayFormatter(use24Hour, locale) }.format(start)
     }
-    val base = "$dateText · $timeText"
-    return event.location?.takeIf { it.isNotBlank() }?.let { "$base · $it" } ?: base
+    return buildAnnotatedString {
+        append("$dateText · $timeText")
+        event.location?.takeIf { it.isNotBlank() }?.let { location ->
+            append(" · ")
+            val offset = length
+            append(location)
+            hit.locationSpans.forEach {
+                addStyle(highlight, offset + it.start, offset + it.end)
+            }
+        }
+        hit.descriptionSnippet?.let { snippet ->
+            append("\n")
+            val offset = length
+            append(snippet.text)
+            snippet.spans.forEach { addStyle(highlight, offset + it.start, offset + it.end) }
+        }
+    }
 }
 
 @Composable

app/src/main/java/de/jeanlucmakiola/calendula/ui/search/SearchViewModel.kt

@@ -6,6 +6,10 @@ import dagger.hilt.android.lifecycle.HiltViewModel
 import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
 import de.jeanlucmakiola.calendula.data.di.IoDispatcher
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.EventSearch
+import de.jeanlucmakiola.calendula.domain.RecurringWriteScope
+import de.jeanlucmakiola.calendula.domain.SearchResults
+import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.FlowPreview
@@ -14,12 +18,19 @@ import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.catch
+import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.debounce
 import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.mapLatest
 import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.atStartOfDayIn
+import kotlinx.datetime.toLocalDateTime
 import kotlin.time.Clock
 import javax.inject.Inject
 
@@ -33,8 +44,30 @@ sealed interface SearchUiState {
     /** A query ran but matched nothing. */
     data class Empty(val query: String) : SearchUiState
 
-    /** Matches, ordered nearest-to-today first (upcoming ascending, then past descending). */
-    data class Results(val events: List<EventInstance>) : SearchUiState
+    /** Matches by month — see [de.jeanlucmakiola.calendula.domain.EventSearch]. */
+    data class Results(
+        val results: SearchResults,
+        /** Rows from these are kept out of selection rather than failing later. */
+        val readOnlyCalendarIds: Set<Long> = emptySet(),
+    ) : SearchUiState {
+        val events: List<EventInstance> get() = results.allHits.map { it.event }
+
+        fun isDeletable(event: EventInstance): Boolean =
+            event.calendarId !in readOnlyCalendarIds
+    }
+}
+
+/** Outcome of deleting the selected results (#80). */
+sealed interface BulkDeleteUiState {
+    data object Idle : BulkDeleteUiState
+
+    data object Deleting : BulkDeleteUiState
+
+    /** Terminal: [deleted] events went, [failed] wouldn't. */
+    data class Done(val deleted: Int, val failed: Int) : BulkDeleteUiState
+
+    /** WRITE_CALENDAR was revoked after [deleted] went; the rest wasn't tried. */
+    data class NeedsPermission(val deleted: Int) : BulkDeleteUiState
 }
 
 @OptIn(ExperimentalCoroutinesApi::class, FlowPreview::class)
@@ -47,17 +80,42 @@ class SearchViewModel @Inject constructor(
     private val _query = MutableStateFlow("")
     val query: StateFlow<String> = _query.asStateFlow()
 
-    val state: StateFlow<SearchUiState> = _query
-        .debounce(250L)
-        .map { it.trim() }
-        .distinctUntilChanged()
+    /** Bumped after a delete so the same query re-runs against the changed provider. */
+    private val _reload = MutableStateFlow(0)
+
+    private val _selection = MutableStateFlow<Set<Long>>(emptySet())
+
+    /** Event ids picked in selection mode; empty means the mode is off. */
+    val selection: StateFlow<Set<Long>> = _selection.asStateFlow()
+
+    private val _deleteState = MutableStateFlow<BulkDeleteUiState>(BulkDeleteUiState.Idle)
+    val deleteState: StateFlow<BulkDeleteUiState> = _deleteState.asStateFlow()
+
+    val state: StateFlow<SearchUiState> = combine(
+        _query.debounce(250L).map { it.trim() }.distinctUntilChanged(),
+        _reload,
+    ) { q, _ -> q }
         .mapLatest { q ->
             if (q.length < MIN_QUERY_LENGTH) {
                 SearchUiState.Idle
             } else {
-                val results = repository.searchEvents(q)
-                if (results.isEmpty()) SearchUiState.Empty(q)
-                else SearchUiState.Results(sortNearestFirst(results))
+                val now = Clock.System.now()
+                val zone = TimeZone.currentSystemDefault()
+                val results = EventSearch.search(
+                    candidates = repository.searchEvents(q),
+                    query = q,
+                    now = now,
+                    todayStart = now.toLocalDateTime(zone).date.atStartOfDayIn(zone),
+                    zone = zone,
+                )
+                if (results.isEmpty) {
+                    SearchUiState.Empty(q)
+                } else {
+                    SearchUiState.Results(
+                        results = results,
+                        readOnlyCalendarIds = readOnlyCalendarIds(),
+                    )
+                }
             }
         }
         .catch { emit(SearchUiState.Idle) }
@@ -65,13 +123,94 @@ class SearchViewModel @Inject constructor(
         .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5_000L), SearchUiState.Idle)
 
     fun setQuery(value: String) {
+        if (value != _query.value) _selection.value = emptySet()
         _query.value = value
     }
 
-    /** Soonest upcoming (and ongoing) first, then the most recent past. */
-    private fun sortNearestFirst(events: List<EventInstance>): List<EventInstance> {
-        val now = Clock.System.now()
-        val (upcoming, past) = events.partition { it.end >= now }
-        return upcoming.sortedBy { it.start } + past.sortedByDescending { it.start }
+    /** Toggle one result; the first pick is what turns selection mode on. */
+    fun toggleSelection(eventId: Long) {
+        val current = _selection.value
+        _selection.value = if (eventId in current) current - eventId else current + eventId
     }
+
+    /** Pick every result that lives in a writable calendar. */
+    fun selectAll() {
+        val results = state.value as? SearchUiState.Results ?: return
+        _selection.value = results.events.filter(results::isDeletable).map { it.eventId }.toSet()
+    }
+
+    /** Leave selection mode. */
+    fun clearSelection() {
+        _selection.value = emptySet()
+    }
+
+    /** Whether the batch needs a [RecurringWriteScope] decision before it runs. */
+    fun selectionHasRecurring(): Boolean {
+        val results = state.value as? SearchUiState.Results ?: return false
+        val picked = _selection.value
+        return results.events.any { it.eventId in picked && it.isRecurring }
+    }
+
+    /**
+     * Delete every selected event. [scope] reaches the recurring ones only; a
+     * one-off always goes whole. One at a time, so a single failure doesn't take
+     * the rest with it — the tally lands in [deleteState].
+     */
+    fun deleteSelected(scope: RecurringWriteScope) {
+        if (_deleteState.value == BulkDeleteUiState.Deleting) return
+        val results = state.value as? SearchUiState.Results ?: return
+        val picked = _selection.value
+        val targets = results.events.filter { it.eventId in picked && results.isDeletable(it) }
+        if (targets.isEmpty()) return
+
+        viewModelScope.launch {
+            _deleteState.value = BulkDeleteUiState.Deleting
+            var deleted = 0
+            var failed = 0
+            var denied = false
+            for (event in targets) {
+                try {
+                    withContext(io) { deleteOne(event, scope) }
+                    deleted++
+                } catch (e: CancellationException) {
+                    throw e
+                } catch (e: SecurityException) {
+                    denied = true
+                    break
+                } catch (e: Exception) {
+                    failed++
+                }
+            }
+            _selection.value = emptySet()
+            _reload.value += 1
+            _deleteState.value = if (denied) {
+                BulkDeleteUiState.NeedsPermission(deleted = deleted)
+            } else {
+                BulkDeleteUiState.Done(deleted = deleted, failed = failed)
+            }
+        }
+    }
+
+    /** Reset [deleteState] after the screen showed the outcome. */
+    fun consumeDeleteResult() {
+        _deleteState.value = BulkDeleteUiState.Idle
+    }
+
+    private suspend fun deleteOne(event: EventInstance, scope: RecurringWriteScope) {
+        val begin = event.start.toEpochMilliseconds()
+        when {
+            !event.isRecurring -> repository.deleteEvent(event.eventId)
+            scope == RecurringWriteScope.ThisEvent ->
+                repository.deleteOccurrence(event.eventId, begin)
+            scope == RecurringWriteScope.ThisAndFollowing ->
+                repository.deleteEventFromOccurrence(event.eventId, begin)
+            else -> repository.deleteEvent(event.eventId)
+        }
+    }
+
+    private suspend fun readOnlyCalendarIds(): Set<Long> =
+        repository.calendars().first()
+            .filterNot { it.canModifyContents }
+            .map { it.id }
+            .toSet()
 }

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

@@ -318,6 +318,26 @@
     <string name="search_idle_hint">Search your events by title, location or notes.</string>
     <string name="search_empty">No events match “%1$s”.</string>
 
+    <!-- Selecting search results to delete several at once (#80) -->
+    <plurals name="search_selected_count">
+        <item quantity="one">%d selected</item>
+        <item quantity="other">%d selected</item>
+    </plurals>
+    <string name="search_in_descriptions">Found in descriptions</string>
+    <string name="search_selection_close">Cancel selection</string>
+    <string name="search_select_all">Select all</string>
+    <string name="search_delete_selected">Delete selected</string>
+    <plurals name="search_delete_title">
+        <item quantity="one">Delete %d event?</item>
+        <item quantity="other">Delete %d events?</item>
+    </plurals>
+    <plurals name="search_delete_done">
+        <item quantity="one">%d event deleted</item>
+        <item quantity="other">%d events deleted</item>
+    </plurals>
+    <string name="search_delete_partial">%1$d deleted, %2$d couldn\'t be</string>
+    <string name="search_delete_denied_partial">%1$d deleted, then write access was withdrawn</string>
+
     <!-- Home-screen widgets -->
     <string name="widget_agenda_title">Upcoming</string>
     <string name="widget_agenda_label">Calendula agenda</string>

app/src/test/java/de/jeanlucmakiola/calendula/data/calendar/CalendarRepositoryImplTest.kt

@@ -11,6 +11,7 @@ import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventColorOption
 import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.SearchCandidate
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.first
 import kotlinx.datetime.LocalDate
@@ -451,15 +452,15 @@ class CalendarRepositoryImplTest {
             calendarsResult = listOf(makeCal(1L), makeCal(2L, visible = false), makeCal(3L))
             searchResult = {
                 listOf(
-                    makeEvent(10L, "Shown", calendarId = 1L),
-                    makeEvent(11L, "Switched off", calendarId = 2L),
-                    makeEvent(12L, "Hidden", calendarId = 3L),
+                    SearchCandidate(makeEvent(10L, "Shown", calendarId = 1L)),
+                    SearchCandidate(makeEvent(11L, "Switched off", calendarId = 2L)),
+                    SearchCandidate(makeEvent(12L, "Hidden", calendarId = 3L)),
                 )
             }
         }
         val repo = CalendarRepositoryImpl(fake, prefs, newSettings(tempDir), Dispatchers.Unconfined)
 
-        assertThat(repo.searchEvents("e").map { it.title }).containsExactly("Shown")
+        assertThat(repo.searchEvents("e").map { it.event.title }).containsExactly("Shown")
     }
 
     @Test

app/src/test/java/de/jeanlucmakiola/calendula/data/calendar/FakeCalendarDataSource.kt

@@ -6,6 +6,7 @@ import de.jeanlucmakiola.calendula.domain.EventColorOption
 import de.jeanlucmakiola.calendula.domain.EventDetail
 import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.SearchCandidate
 import de.jeanlucmakiola.calendula.domain.contacts.SpecialDateType
 import de.jeanlucmakiola.calendula.domain.ics.IcsEvent
 import de.jeanlucmakiola.calendula.domain.ics.ParsedIcsEvent
@@ -19,7 +20,7 @@ internal class FakeCalendarDataSource : CalendarDataSource {
 
     var calendarsResult: List<CalendarSource> = emptyList()
     var instancesResult: (Long, Long) -> List<EventInstance> = { _, _ -> emptyList() }
-    var searchResult: (String) -> List<EventInstance> = { _ -> emptyList() }
+    var searchResult: (String) -> List<SearchCandidate> = { _ -> emptyList() }
     var eventDetailResult: (Long) -> EventDetail? = { null }
     var eventColorPaletteResult: (Long) -> List<EventColorOption> = { emptyList() }
     var exportableEventsResult: List<IcsEvent> = emptyList()
@@ -29,6 +30,10 @@ internal class FakeCalendarDataSource : CalendarDataSource {
     var existingUidsResult: Set<String> = emptySet()
     /** Set to make the next write call throw. */
     var writeError: Exception? = null
+
+    /** Deletes let through before [writeError] applies, for part-way failures. */
+    var deletesBeforeError: Int = 0
+    private var deletes = 0
     /** Id returned by the next [insertEvent]. */
     var nextInsertId: Long = 100L
 
@@ -71,7 +76,7 @@ internal class FakeCalendarDataSource : CalendarDataSource {
     }
     override fun instances(beginMillis: Long, endMillis: Long): List<EventInstance> =
         instancesResult(beginMillis, endMillis)
-    override fun searchEvents(query: String): List<EventInstance> = searchResult(query)
+    override fun searchEvents(query: String): List<SearchCandidate> = searchResult(query)
     override fun eventDetail(eventId: Long, allDayReminderTimeMinutes: Int): EventDetail? =
         eventDetailResult(eventId)
     override fun eventColorPalette(calendarId: Long): List<EventColorOption> =
@@ -196,7 +201,7 @@ internal class FakeCalendarDataSource : CalendarDataSource {
     }
 
     override fun deleteEvent(eventId: Long) {
-        writeError?.let { throw it }
+        writeError?.let { if (deletes++ >= deletesBeforeError) throw it }
         deletedEventIds += eventId
         managedEvents.values.forEach { rows -> rows.removeAll { it.eventId == eventId } }
     }

app/src/test/java/de/jeanlucmakiola/calendula/data/calendar/SearchMapperTest.kt

@@ -16,7 +16,11 @@ class SearchMapperTest {
         eventColor: Any? = null,
         calendarColor: Int = 0xFFAABBCC.toInt(),
         location: String? = null,
+        rrule: String? = null,
+        rdate: String? = null,
     ): MapColumnReader = MapColumnReader(
+        SearchProjection.IDX_RRULE to rrule,
+        SearchProjection.IDX_RDATE to rdate,
         SearchProjection.IDX_ID to id,
         SearchProjection.IDX_CALENDAR_ID to calendarId,
         SearchProjection.IDX_TITLE to title,
@@ -42,4 +46,16 @@ class SearchMapperTest {
     fun `absent dtstart drops the search hit`() {
         assertThat(searchReader(dtstart = null).toSearchResult()).isNull()
     }
+
+    @Test
+    fun `a rule or an rdate marks the hit recurring (issue #80)`() {
+        assertThat(searchReader().toSearchResult()!!.isRecurring).isFalse()
+        assertThat(searchReader(rrule = "").toSearchResult()!!.isRecurring).isFalse()
+        assertThat(
+            searchReader(rrule = "FREQ=WEEKLY").toSearchResult()!!.isRecurring,
+        ).isTrue()
+        assertThat(
+            searchReader(rdate = "20260101T000000Z").toSearchResult()!!.isRecurring,
+        ).isTrue()
+    }
 }

app/src/test/java/de/jeanlucmakiola/calendula/domain/EventSearchTest.kt

@@ -0,0 +1,315 @@
+package de.jeanlucmakiola.calendula.domain
+
+import com.google.common.truth.Truth.assertThat
+import kotlinx.datetime.TimeZone
+import org.junit.jupiter.api.Test
+import kotlin.time.Instant
+
+/**
+ * Search matching and how the results are laid out (#80 follow-up): a calendar
+ * of months rather than a ranking, with description-only hits held back.
+ */
+class EventSearchTest {
+
+    private val zone = TimeZone.UTC
+
+    /** 2027-01-15T08:00Z — mid-month and mid-day, so both sides of each are testable. */
+    private val now = Instant.parse("2027-01-15T08:00:00Z")
+    private val todayStart = Instant.parse("2027-01-15T00:00:00Z")
+
+    private var nextId = 1L
+
+    private fun candidate(
+        title: String,
+        start: String = "2027-01-20T09:00:00Z",
+        location: String? = null,
+        description: String? = null,
+    ): SearchCandidate {
+        val begin = Instant.parse(start)
+        return SearchCandidate(
+            event = EventInstance(
+                instanceId = nextId,
+                eventId = nextId++,
+                calendarId = 1L,
+                title = title,
+                start = begin,
+                end = begin.plus(kotlin.time.Duration.parse("1h")),
+                isAllDay = false,
+                color = 0,
+                location = location,
+            ),
+            description = description,
+        )
+    }
+
+    /** [day] is the event's own date; all-day events sit at UTC midnight. */
+    private fun allDayCandidate(title: String, day: String): SearchCandidate {
+        val begin = Instant.parse("${day}T00:00:00Z")
+        return SearchCandidate(
+            event = EventInstance(
+                instanceId = nextId,
+                eventId = nextId++,
+                calendarId = 1L,
+                title = title,
+                start = begin,
+                end = begin.plus(kotlin.time.Duration.parse("24h")),
+                isAllDay = true,
+                color = 0,
+                location = null,
+            ),
+        )
+    }
+
+    private fun search(vararg candidates: SearchCandidate, query: String): SearchResults =
+        EventSearch.search(candidates.toList(), query, now, todayStart, zone)
+
+    private fun datedTitles(results: SearchResults): List<String> =
+        results.months.flatMap { month -> month.hits.map { it.event.title } }
+
+    @Test
+    fun `hits are grouped into months, this one first, then ahead, then back`() {
+        val thisMonth = candidate("Test A", start = "2027-01-20T09:00:00Z")
+        val nextMonth = candidate("Test B", start = "2027-02-03T09:00:00Z")
+        val lastMonth = candidate("Test C", start = "2026-12-10T09:00:00Z")
+        val yearBefore = candidate("Test D", start = "2026-03-10T09:00:00Z")
+
+        val results = search(yearBefore, nextMonth, lastMonth, thisMonth, query = "test")
+
+        assertThat(results.months.map { it.year to it.monthNumber })
+            .containsExactly(2027 to 1, 2027 to 2, 2026 to 12, 2026 to 3)
+            .inOrder()
+        assertThat(datedTitles(results)).containsExactly("Test A", "Test B", "Test C", "Test D")
+            .inOrder()
+    }
+
+    @Test
+    fun `inside a month what is still to come comes before what has passed`() {
+        // Both sides of today share one January card rather than two headers.
+        val earlierThisMonth = candidate("Test past", start = "2027-01-05T09:00:00Z")
+        val laterThisMonth = candidate("Test soon", start = "2027-01-20T09:00:00Z")
+
+        val results = search(earlierThisMonth, laterThisMonth, query = "test")
+
+        assertThat(results.months).hasSize(1)
+        assertThat(datedTitles(results)).containsExactly("Test soon", "Test past").inOrder()
+    }
+
+    @Test
+    fun `an event still running today keeps its place among the upcoming ones`() {
+        // Reported: "test" at 19:00 having passed must not fall behind "test2" at
+        // 23:00 — the day is the boundary, not the moment.
+        val earlierToday = candidate("test", start = "2027-01-15T05:00:00Z")
+        val laterToday = candidate("test2", start = "2027-01-15T20:00:00Z")
+
+        val results = search(laterToday, earlierToday, query = "test")
+
+        assertThat(datedTitles(results)).containsExactly("test", "test2").inOrder()
+    }
+
+    @Test
+    fun `a match tomorrow comes before one from yesterday`() {
+        val yesterday = candidate("test", start = "2027-01-14T09:00:00Z")
+        val tomorrow = candidate("test2", start = "2027-01-16T09:00:00Z")
+
+        val results = search(yesterday, tomorrow, query = "test")
+
+        assertThat(datedTitles(results)).containsExactly("test2", "test").inOrder()
+    }
+
+    @Test
+    fun `a description-only hit is held back from the dated months`() {
+        // The original complaint: "protestantischer" in a holiday's notes landed
+        // among the events actually named Test.
+        val holiday = candidate(
+            "Reformationstag",
+            start = "2027-01-16T09:00:00Z",
+            description = "Feiertag der protestantischer Kirchen",
+        )
+        val real = candidate("Test", start = "2027-06-01T09:00:00Z")
+
+        val results = search(holiday, real, query = "test")
+
+        assertThat(datedTitles(results)).containsExactly("Test")
+        assertThat(results.inDescriptions.map { it.event.title }).containsExactly("Reformationstag")
+    }
+
+    @Test
+    fun `a location match stays in the dated months`() {
+        val located = candidate("Frühstück", location = "Büro")
+
+        val results = search(located, query = "büro")
+
+        assertThat(datedTitles(results)).containsExactly("Frühstück")
+        assertThat(results.inDescriptions).isEmpty()
+    }
+
+    @Test
+    fun `an event named for one token stays dated even if another is in the notes`() {
+        val mixed = candidate("Zahnarzt", description = "Termin bestätigen")
+
+        val results = search(mixed, query = "zahnarzt termin")
+
+        assertThat(datedTitles(results)).containsExactly("Zahnarzt")
+        assertThat(results.inDescriptions).isEmpty()
+    }
+
+    @Test
+    fun `every token has to match, in any field and any order`() {
+        val both = candidate("Zahnarzt", description = "Termin bestätigen")
+        val onlyOne = candidate("Zahnarzt")
+
+        val results = search(both, onlyOne, query = "termin zahnarzt")
+
+        assertThat(results.allHits.map { it.event.eventId }).containsExactly(both.event.eventId)
+    }
+
+    @Test
+    fun `a mid-word match is still found, so compounds keep working`() {
+        val compound = candidate("Zahnarzttermin")
+
+        assertThat(datedTitles(search(compound, query = "termin"))).containsExactly("Zahnarzttermin")
+    }
+
+    @Test
+    fun `case folds beyond ASCII`() {
+        assertThat(datedTitles(search(candidate("ÄRZTE Termin"), query = "ärzte")))
+            .containsExactly("ÄRZTE Termin")
+        assertThat(datedTitles(search(candidate("ärzte"), query = "ÄRZTE")))
+            .containsExactly("ärzte")
+    }
+
+    @Test
+    fun `an all-day event is filed by its own day, not by UTC`() {
+        // Behind UTC an all-day event sits at midnight UTC, which is the previous
+        // month locally (#82) — the month has to come from the span's first day.
+        val newYear = SearchCandidate(
+            event = EventInstance(
+                instanceId = 99L,
+                eventId = 99L,
+                calendarId = 1L,
+                title = "Test holiday",
+                start = Instant.parse("2027-02-01T00:00:00Z"),
+                end = Instant.parse("2027-02-02T00:00:00Z"),
+                isAllDay = true,
+                color = 0,
+                location = null,
+            ),
+        )
+
+        val results = EventSearch.search(
+            listOf(newYear),
+            "test",
+            now,
+            todayStart,
+            TimeZone.of("America/New_York"),
+        )
+
+        assertThat(results.months.single().let { it.year to it.monthNumber }).isEqualTo(2027 to 2)
+    }
+
+    @Test
+    fun `an all-day event that has passed does not rank as still to come`() {
+        // Ahead of UTC its UTC-midnight end lands after the local day started, so
+        // comparing raw instants floated yesterday's holiday above today's events.
+        val berlin = TimeZone.of("Europe/Berlin")
+        val yesterday = allDayCandidate("Test holiday", "2027-01-14")
+        val tomorrow = candidate("Test soon", start = "2027-01-16T09:00:00Z")
+
+        val results = EventSearch.search(
+            listOf(yesterday, tomorrow),
+            "test",
+            Instant.parse("2027-01-15T07:00:00Z"),
+            Instant.parse("2027-01-14T23:00:00Z"),
+            berlin,
+        )
+
+        assertThat(datedTitles(results)).containsExactly("Test soon", "Test holiday").inOrder()
+        assertThat(results.allHits.last().isPast).isTrue()
+    }
+
+    @Test
+    fun `an all-day event is not past until its own day is over`() {
+        // 21:00 in Los Angeles, where the event's UTC-midnight end is already gone.
+        val results = EventSearch.search(
+            listOf(allDayCandidate("Test holiday", "2027-01-15")),
+            "test",
+            Instant.parse("2027-01-16T05:00:00Z"),
+            Instant.parse("2027-01-15T08:00:00Z"),
+            TimeZone.of("America/Los_Angeles"),
+        )
+
+        assertThat(results.allHits.single().isPast).isFalse()
+    }
+
+    @Test
+    fun `an untitled event's placeholder is not something the query can match`() {
+        val untitled = candidate("(Ohne Titel)", description = "Titel folgt noch").copy(title = null)
+
+        val results = search(untitled, query = "titel")
+
+        assertThat(datedTitles(results)).isEmpty()
+        assertThat(results.inDescriptions.single().titleSpans).isEmpty()
+    }
+
+    @Test
+    fun `a hit that has already finished is marked past, including earlier today`() {
+        val earlierToday = candidate("test", start = "2027-01-15T05:00:00Z")
+        val laterToday = candidate("test", start = "2027-01-15T20:00:00Z")
+
+        val hits = search(earlierToday, laterToday, query = "test")
+            .allHits
+            .associateBy { it.event.eventId }
+
+        assertThat(hits.getValue(earlierToday.event.eventId).isPast).isTrue()
+        assertThat(hits.getValue(laterToday.event.eventId).isPast).isFalse()
+    }
+
+    @Test
+    fun `the title carries the spans to highlight, merged where they overlap`() {
+        val hit = search(candidate("Test the tester"), query = "test").allHits.single()
+
+        assertThat(hit.titleSpans).containsExactly(MatchSpan(0, 4), MatchSpan(9, 13)).inOrder()
+    }
+
+    @Test
+    fun `a description snippet is excerpted around its match`() {
+        val long = "x".repeat(300) + " geheimwort " + "y".repeat(300)
+
+        val snippet = search(candidate("Notiz", description = long), query = "geheimwort")
+            .allHits
+            .single()
+            .descriptionSnippet
+
+        requireNotNull(snippet)
+        assertThat(snippet.text).contains("geheimwort")
+        assertThat(snippet.text.length).isLessThan(long.length)
+        assertThat(snippet.text).startsWith("…")
+        val span = snippet.spans.single()
+        assertThat(snippet.text.substring(span.start, span.end)).isEqualTo("geheimwort")
+    }
+
+    @Test
+    fun `a title-only match carries no description snippet`() {
+        val hit = search(candidate("Test", description = "nothing relevant here"), query = "test")
+            .allHits
+            .single()
+
+        assertThat(hit.descriptionSnippet).isNull()
+    }
+
+    @Test
+    fun `a multi-line description matches and snippets as one line`() {
+        val snippet = search(
+            candidate("Notiz", description = "erste Zeile\n\n  zweite Zeile"),
+            query = "zweite",
+        ).allHits.single().descriptionSnippet
+
+        requireNotNull(snippet)
+        assertThat(snippet.text).isEqualTo("erste Zeile zweite Zeile")
+    }
+
+    @Test
+    fun `a blank query matches nothing`() {
+        assertThat(search(candidate("Test"), query = "   ").isEmpty).isTrue()
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/ui/search/SearchViewModelTest.kt

@@ -0,0 +1,247 @@
+package de.jeanlucmakiola.calendula.ui.search
+
+import androidx.datastore.preferences.core.PreferenceDataStoreFactory
+import com.google.common.truth.Truth.assertThat
+import de.jeanlucmakiola.calendula.data.calendar.CalendarRepositoryImpl
+import de.jeanlucmakiola.calendula.data.calendar.FakeCalendarDataSource
+import de.jeanlucmakiola.calendula.data.prefs.CalendarPrefs
+import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
+import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.RecurringWriteScope
+import de.jeanlucmakiola.calendula.domain.SearchCandidate
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.advanceUntilIdle
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.runTest
+import kotlinx.coroutines.test.setMain
+import org.junit.jupiter.api.AfterEach
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.io.TempDir
+import java.nio.file.Path
+import kotlin.time.Instant
+
+/**
+ * Selecting search results and deleting the batch (#80): which repository call
+ * each kind of hit routes to, and what a read-only calendar is allowed to join.
+ */
+@OptIn(ExperimentalCoroutinesApi::class)
+class SearchViewModelTest {
+
+    private val dispatcher = UnconfinedTestDispatcher()
+
+    @BeforeEach fun setUp() = Dispatchers.setMain(dispatcher)
+    @AfterEach fun tearDown() = Dispatchers.resetMain()
+
+    private val begin = 1_800_000_000_000L
+
+    private fun cal(id: Long, canModify: Boolean = true) = CalendarSource(
+        id = id, displayName = "Cal $id", accountName = "acc@local", accountType = "LOCAL",
+        color = 0xFF112233.toInt(), isVisibleInSystem = true, canModifyContents = canModify,
+    )
+
+    private fun hit(
+        id: Long,
+        calendarId: Long = 1L,
+        recurring: Boolean = false,
+        startMillis: Long = begin,
+    ) = SearchCandidate(
+        EventInstance(
+            instanceId = id, eventId = id, calendarId = calendarId, title = "Standup $id",
+            start = Instant.fromEpochMilliseconds(startMillis),
+            end = Instant.fromEpochMilliseconds(startMillis + 3_600_000L),
+            isAllDay = false, color = 0xFF000000.toInt(), location = null, isRecurring = recurring,
+        ),
+    )
+
+    private fun viewModel(tempDir: Path, fake: FakeCalendarDataSource): SearchViewModel {
+        val prefs = CalendarPrefs(
+            PreferenceDataStoreFactory.create(
+                scope = CoroutineScope(dispatcher),
+                produceFile = { tempDir.resolve("search_prefs.preferences_pb").toFile() },
+            ),
+        )
+        val settings = SettingsPrefs(
+            PreferenceDataStoreFactory.create(
+                scope = CoroutineScope(dispatcher),
+                produceFile = { tempDir.resolve("search_settings.preferences_pb").toFile() },
+            ),
+        )
+        val repo = CalendarRepositoryImpl(fake, prefs, settings, dispatcher as CoroutineDispatcher)
+        return SearchViewModel(repo, dispatcher)
+    }
+
+    private fun CoroutineScope.activate(vm: SearchViewModel): Job = launch { vm.state.collect {} }
+
+    @Test
+    fun `a batch of one-offs deletes each event whole`(@TempDir tempDir: Path) =
+        runTest(dispatcher) {
+            val fake = FakeCalendarDataSource().apply {
+                calendarsResult = listOf(cal(1L))
+                searchResult = { listOf(hit(1L), hit(2L), hit(3L)) }
+            }
+            val vm = viewModel(tempDir, fake)
+            val job = activate(vm)
+
+            vm.setQuery("standup")
+            advanceUntilIdle()
+            vm.toggleSelection(1L)
+            vm.toggleSelection(3L)
+            assertThat(vm.selectionHasRecurring()).isFalse()
+
+            vm.deleteSelected(RecurringWriteScope.AllEvents)
+            advanceUntilIdle()
+
+            assertThat(fake.deletedEventIds).containsExactly(1L, 3L)
+            assertThat(fake.deletedOccurrences).isEmpty()
+            assertThat(vm.selection.value).isEmpty()
+            assertThat(vm.deleteState.value).isEqualTo(BulkDeleteUiState.Done(deleted = 2, failed = 0))
+            job.cancel()
+        }
+
+    @Test
+    fun `the batch scope reaches the recurring hits only`(@TempDir tempDir: Path) =
+        runTest(dispatcher) {
+            val fake = FakeCalendarDataSource().apply {
+                calendarsResult = listOf(cal(1L))
+                searchResult = { listOf(hit(1L), hit(2L, recurring = true)) }
+            }
+            val vm = viewModel(tempDir, fake)
+            val job = activate(vm)
+
+            vm.setQuery("standup")
+            advanceUntilIdle()
+            vm.selectAll()
+            assertThat(vm.selectionHasRecurring()).isTrue()
+
+            vm.deleteSelected(RecurringWriteScope.ThisEvent)
+            advanceUntilIdle()
+
+            // The one-off goes whole whatever the batch decided; only the series
+            // sees the scope, cancelling the occurrence the result row stands for.
+            assertThat(fake.deletedEventIds).containsExactly(1L)
+            assertThat(fake.deletedOccurrences).containsExactly(2L to begin)
+            job.cancel()
+        }
+
+    @Test
+    fun `this-and-following truncates the recurring hit from its shown occurrence`(
+        @TempDir tempDir: Path,
+    ) = runTest(dispatcher) {
+        val fake = FakeCalendarDataSource().apply {
+            calendarsResult = listOf(cal(1L))
+            searchResult = { listOf(hit(9L, recurring = true)) }
+        }
+        val vm = viewModel(tempDir, fake)
+        val job = activate(vm)
+
+        vm.setQuery("standup")
+        advanceUntilIdle()
+        vm.toggleSelection(9L)
+        vm.deleteSelected(RecurringWriteScope.ThisAndFollowing)
+        advanceUntilIdle()
+
+        assertThat(fake.deletedFromOccurrences).containsExactly(9L to begin)
+        job.cancel()
+    }
+
+    @Test
+    fun `a read-only calendar's hit cannot be selected or deleted`(@TempDir tempDir: Path) =
+        runTest(dispatcher) {
+            val fake = FakeCalendarDataSource().apply {
+                calendarsResult = listOf(cal(1L), cal(2L, canModify = false))
+                searchResult = { listOf(hit(1L, calendarId = 1L), hit(2L, calendarId = 2L)) }
+            }
+            val vm = viewModel(tempDir, fake)
+            val job = activate(vm)
+
+            vm.setQuery("standup")
+            advanceUntilIdle()
+
+            val results = vm.state.value as SearchUiState.Results
+            assertThat(results.isDeletable(results.events.single { it.eventId == 2L })).isFalse()
+
+            vm.selectAll()
+            assertThat(vm.selection.value).containsExactly(1L)
+
+            // Even a hand-toggled read-only row is dropped before the write.
+            vm.toggleSelection(2L)
+            vm.deleteSelected(RecurringWriteScope.AllEvents)
+            advanceUntilIdle()
+
+            assertThat(fake.deletedEventIds).containsExactly(1L)
+            job.cancel()
+        }
+
+    @Test
+    fun `a failing delete leaves the rest of the batch alone`(@TempDir tempDir: Path) =
+        runTest(dispatcher) {
+            val fake = FakeCalendarDataSource().apply {
+                calendarsResult = listOf(cal(1L))
+                searchResult = { listOf(hit(1L), hit(2L)) }
+                writeError = IllegalStateException("provider said no")
+            }
+            val vm = viewModel(tempDir, fake)
+            val job = activate(vm)
+
+            vm.setQuery("standup")
+            advanceUntilIdle()
+            vm.selectAll()
+            vm.deleteSelected(RecurringWriteScope.AllEvents)
+            advanceUntilIdle()
+
+            assertThat(vm.deleteState.value)
+                .isEqualTo(BulkDeleteUiState.Done(deleted = 0, failed = 2))
+            job.cancel()
+        }
+
+    @Test
+    fun `a permission revoked mid-batch still reports what already went`(@TempDir tempDir: Path) =
+        runTest(dispatcher) {
+            val fake = FakeCalendarDataSource().apply {
+                calendarsResult = listOf(cal(1L))
+                searchResult = { listOf(hit(1L), hit(2L), hit(3L)) }
+                writeError = SecurityException("revoked")
+                deletesBeforeError = 1
+            }
+            val vm = viewModel(tempDir, fake)
+            val job = activate(vm)
+
+            vm.setQuery("standup")
+            advanceUntilIdle()
+            vm.selectAll()
+            vm.deleteSelected(RecurringWriteScope.AllEvents)
+            advanceUntilIdle()
+
+            assertThat(fake.deletedEventIds).hasSize(1)
+            assertThat(vm.deleteState.value)
+                .isEqualTo(BulkDeleteUiState.NeedsPermission(deleted = 1))
+            job.cancel()
+        }
+
+    @Test
+    fun `changing the query drops the selection`(@TempDir tempDir: Path) = runTest(dispatcher) {
+        val fake = FakeCalendarDataSource().apply {
+            calendarsResult = listOf(cal(1L))
+            searchResult = { listOf(hit(1L)) }
+        }
+        val vm = viewModel(tempDir, fake)
+        val job = activate(vm)
+
+        vm.setQuery("standup")
+        advanceUntilIdle()
+        vm.toggleSelection(1L)
+        assertThat(vm.selection.value).isNotEmpty()
+
+        vm.setQuery("retro")
+        assertThat(vm.selection.value).isEmpty()
+        job.cancel()
+    }
+}