Moves the thread formatter and calculator out of Note

app/src/main/java/com/vitorpamplona/amethyst/model/Note.kt

@@ -72,9 +72,6 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.suspendCancellableCoroutine
 import kotlinx.coroutines.withTimeoutOrNull
 import java.math.BigDecimal
-import java.time.Instant
-import java.time.ZoneId
-import java.time.format.DateTimeFormatter
 import kotlin.coroutines.resume
 
 @Stable
@@ -211,98 +208,6 @@ open class Note(val idHex: String) {
         }
     }
 
-    val levelFormatter = DateTimeFormatter.ofPattern("uuuu-MM-dd-HH:mm:ss")
-
-    fun formattedDateTime(timestamp: Long): String {
-        return Instant.ofEpochSecond(timestamp)
-            .atZone(ZoneId.systemDefault())
-            .format(levelFormatter)
-    }
-
-    data class LevelSignature(val signature: String, val createdAt: Long?, val author: User?)
-
-    /**
-     * This method caches signatures during each execution to avoid recalculation in longer threads
-     */
-    fun replyLevelSignature(
-        eventsToConsider: Set<HexKey>,
-        cachedSignatures: MutableMap<Note, LevelSignature>,
-        account: User,
-        accountFollowingSet: Set<String>,
-        now: Long,
-    ): LevelSignature {
-        val replyTo = replyTo
-        if (
-            event is RepostEvent || event is GenericRepostEvent || replyTo == null || replyTo.isEmpty()
-        ) {
-            return LevelSignature(
-                signature = "/" + formattedDateTime(createdAt() ?: 0) + idHex.substring(0, 8) + ";",
-                createdAt = createdAt(),
-                author = author,
-            )
-        }
-
-        val parent =
-            (
-                replyTo
-                    .filter {
-                        it.idHex in eventsToConsider
-                    } // This forces the signature to be based on a branch, avoiding two roots
-                    .map {
-                        cachedSignatures[it]
-                            ?: it
-                                .replyLevelSignature(
-                                    eventsToConsider,
-                                    cachedSignatures,
-                                    account,
-                                    accountFollowingSet,
-                                    now,
-                                )
-                                .apply { cachedSignatures.put(it, this) }
-                    }
-                    .maxByOrNull { it.signature.length }
-            )
-
-        val parentSignature = parent?.signature?.removeSuffix(";") ?: ""
-
-        val threadOrder =
-            if (parent?.author == author && createdAt() != null) {
-                // author of the thread first, in **ascending** order
-                "9" +
-                    formattedDateTime((parent?.createdAt ?: 0) + (now - (createdAt() ?: 0))) +
-                    idHex.substring(0, 8)
-            } else if (author?.pubkeyHex == account.pubkeyHex) {
-                "8" + formattedDateTime(createdAt() ?: 0) + idHex.substring(0, 8) // my replies
-            } else if (author?.pubkeyHex in accountFollowingSet) {
-                "7" + formattedDateTime(createdAt() ?: 0) + idHex.substring(0, 8) // my follows replies.
-            } else {
-                "0" + formattedDateTime(createdAt() ?: 0) + idHex.substring(0, 8) // everyone else.
-            }
-
-        val mySignature =
-            LevelSignature(
-                signature = parentSignature + "/" + threadOrder + ";",
-                createdAt = createdAt(),
-                author = author,
-            )
-
-        cachedSignatures[this] = mySignature
-        return mySignature
-    }
-
-    fun replyLevel(cachedLevels: MutableMap<Note, Int> = mutableMapOf()): Int {
-        val replyTo = replyTo
-        if (
-            event is RepostEvent || event is GenericRepostEvent || replyTo == null || replyTo.isEmpty()
-        ) {
-            return 0
-        }
-
-        return replyTo.maxOf {
-            cachedLevels[it] ?: it.replyLevel(cachedLevels).apply { cachedLevels.put(it, this) }
-        } + 1
-    }
-
     fun addReply(note: Note) {
         if (note !in replies) {
             replies = replies + note

app/src/main/java/com/vitorpamplona/amethyst/model/ThreadLevelCalculator.kt

@@ -0,0 +1,125 @@
+/**
+ * Copyright (c) 2024 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.model
+
+import com.vitorpamplona.quartz.encoders.HexKey
+import com.vitorpamplona.quartz.events.GenericRepostEvent
+import com.vitorpamplona.quartz.events.RepostEvent
+import java.time.Instant
+import java.time.ZoneId
+import java.time.format.DateTimeFormatter
+
+data class LevelSignature(val signature: String, val createdAt: Long?, val author: User?)
+
+object ThreadLevelCalculator {
+    val levelFormatter = DateTimeFormatter.ofPattern("uuuu-MM-dd-HH:mm:ss")
+
+    private fun formattedDateTime(timestamp: Long): String {
+        return Instant.ofEpochSecond(timestamp)
+            .atZone(ZoneId.systemDefault())
+            .format(levelFormatter)
+    }
+
+    /**
+     * This method caches signatures during each execution to avoid recalculation in longer threads
+     */
+    fun replyLevelSignature(
+        note: Note,
+        eventsToConsider: Set<HexKey>,
+        cachedSignatures: MutableMap<Note, LevelSignature>,
+        account: User,
+        accountFollowingSet: Set<String>,
+        now: Long,
+    ): LevelSignature {
+        val replyTo = note.replyTo
+        if (
+            note.event is RepostEvent || note.event is GenericRepostEvent || replyTo == null || replyTo.isEmpty()
+        ) {
+            return LevelSignature(
+                signature = "/" + formattedDateTime(note.createdAt() ?: 0) + note.idHex.substring(0, 8) + ";",
+                createdAt = note.createdAt(),
+                author = note.author,
+            )
+        }
+
+        val parent =
+            (
+                replyTo
+                    .filter {
+                        it.idHex in eventsToConsider
+                    } // This forces the signature to be based on a branch, avoiding two roots
+                    .map {
+                        cachedSignatures[it]
+                            ?: replyLevelSignature(
+                                it,
+                                eventsToConsider,
+                                cachedSignatures,
+                                account,
+                                accountFollowingSet,
+                                now,
+                            ).apply { cachedSignatures.put(it, this) }
+                    }
+                    .maxByOrNull { it.signature.length }
+            )
+
+        val parentSignature = parent?.signature?.removeSuffix(";") ?: ""
+
+        val threadOrder =
+            if (parent?.author == note.author && note.createdAt() != null) {
+                // author of the thread first, in **ascending** order
+                "9" +
+                    formattedDateTime((parent?.createdAt ?: 0) + (now - (note.createdAt() ?: 0))) +
+                    note.idHex.substring(0, 8)
+            } else if (note.author?.pubkeyHex == account.pubkeyHex) {
+                "8" + formattedDateTime(note.createdAt() ?: 0) + note.idHex.substring(0, 8) // my replies
+            } else if (note.author?.pubkeyHex in accountFollowingSet) {
+                "7" + formattedDateTime(note.createdAt() ?: 0) + note.idHex.substring(0, 8) // my follows replies.
+            } else {
+                "0" + formattedDateTime(note.createdAt() ?: 0) + note.idHex.substring(0, 8) // everyone else.
+            }
+
+        val mySignature =
+            LevelSignature(
+                signature = parentSignature + "/" + threadOrder + ";",
+                createdAt = note.createdAt(),
+                author = note.author,
+            )
+
+        cachedSignatures[note] = mySignature
+        return mySignature
+    }
+
+    fun replyLevel(
+        note: Note,
+        cachedLevels: MutableMap<Note, Int> = mutableMapOf(),
+    ): Int {
+        val replyTo = note.replyTo
+        if (
+            note.event is RepostEvent || note.event is GenericRepostEvent || replyTo == null || replyTo.isEmpty()
+        ) {
+            return 0
+        }
+
+        return replyTo.maxOf {
+            cachedLevels[it] ?: replyLevel(it, cachedLevels).apply { cachedLevels.put(it, this) }
+        } + 1
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/ThreadFeedFilter.kt

@@ -22,8 +22,10 @@ package com.vitorpamplona.amethyst.ui.dal
 
 import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.Account
+import com.vitorpamplona.amethyst.model.LevelSignature
 import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.model.ThreadAssembler
+import com.vitorpamplona.amethyst.model.ThreadLevelCalculator
 import com.vitorpamplona.quartz.utils.TimeUtils
 
 @Immutable
@@ -33,7 +35,7 @@ class ThreadFeedFilter(val account: Account, val noteId: String) : FeedFilter<No
     }
 
     override fun feed(): List<Note> {
-        val cachedSignatures: MutableMap<Note, Note.LevelSignature> = mutableMapOf()
+        val cachedSignatures: MutableMap<Note, LevelSignature> = mutableMapOf()
         val followingKeySet = account.liveKind3Follows.value.users
         val eventsToWatch = ThreadAssembler().findThreadFor(noteId)
         val eventsInHex = eventsToWatch.map { it.idHex }.toSet()
@@ -42,15 +44,14 @@ class ThreadFeedFilter(val account: Account, val noteId: String) : FeedFilter<No
         // Currently orders by date of each event, descending, at each level of the reply stack
         val order =
             compareByDescending<Note> {
-                it
+                ThreadLevelCalculator.replyLevelSignature(
-                    .replyLevelSignature(
+                    it,
                     eventsInHex,
                     cachedSignatures,
                     account.userProfile(),
                     followingKeySet,
                     now,
-                    )
+                ).signature
-                    .signature
             }
 
         return eventsToWatch.sortedWith(order)

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/ThreadFeedView.kt

@@ -79,6 +79,7 @@ import coil.compose.AsyncImage
 import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.model.ThreadLevelCalculator
 import com.vitorpamplona.amethyst.ui.components.GenericLoadable
 import com.vitorpamplona.amethyst.ui.components.InlineCarrousel
 import com.vitorpamplona.amethyst.ui.components.LoadNote
@@ -247,7 +248,7 @@ fun RenderThreadFeed(
                         item,
                         modifier =
                             Modifier.drawReplyLevel(
-                                item.replyLevel(),
+                                ThreadLevelCalculator.replyLevel(item),
                                 MaterialTheme.colorScheme.placeholderText,
                                 if (item.idHex == noteId) {
                                     MaterialTheme.colorScheme.lessImportantLink
@@ -270,7 +271,7 @@ fun RenderThreadFeed(
                     item,
                     modifier =
                         Modifier.drawReplyLevel(
-                            item.replyLevel(),
+                            ThreadLevelCalculator.replyLevel(item),
                             MaterialTheme.colorScheme.placeholderText,
                             if (item.idHex == noteId) {
                                 MaterialTheme.colorScheme.lessImportantLink