Implement thumbnails

Signed-off-by: denis0001-dev <denis0001.dev@ya.ru>

app/shared/build.gradle.kts

@@ -40,7 +40,6 @@ kotlin {
             implementation(libs.ktor.client.okhttp)
             implementation(libs.androidx.activity.compose)
             implementation(libs.androidx.work.runtime.ktx)
-            // NaCl box implementation for transport encryption (Android/JVM only)
             implementation("org.purejava:tweetnacl-java:1.1.3")
         }
 

app/shared/src/commonMain/kotlin/ru/fromchat/api/ApiClient.kt

@@ -334,10 +334,9 @@ object ApiClient {
     /**
      * Fetch encrypted file bytes. Path is e.g. "/uploads/files/encrypted/xxx.jpg" or "/api/uploads/files/encrypted/xxx.jpg".
      * Backend may return path with /api prefix; apiBaseUrl already includes /api, so we avoid double /api.
-     * @param thumb if true, appends ?thumb=1 for thumbnail (JPEG, ~5 KB)
      */
-    suspend fun fetchEncryptedFile(path: String, thumb: Boolean = false): ByteArray {
+    suspend fun fetchEncryptedFile(path: String): ByteArray {
-        val baseUrl = when {
+        val url = when {
             path.startsWith("http") -> path
             path.startsWith("/api") -> {
                 val serverBase = Config.apiBaseUrl.removeSuffix("/api")
@@ -345,17 +344,9 @@ object ApiClient {
             }
             else -> "${Config.apiBaseUrl}$path"
         }
-        val url = if (thumb) "$baseUrl?thumb=1" else baseUrl
         return http.get(url).body()
     }
 
-    /**
-     * Fetch thumbnail for an image file. Returns null if thumbnail not available (404).
-     */
-    suspend fun fetchThumbnail(path: String): ByteArray? = runCatching {
-        fetchEncryptedFile(path, thumb = true)
-    }.getOrNull()
-
     /**
      * Edit an existing direct message using the same transport encryption scheme as /dm/send.
      */

app/shared/src/commonMain/kotlin/ru/fromchat/api/Models.kt

@@ -101,7 +101,11 @@ data class Message(
     /** For optimistic UI: 0-100 upload progress, null when complete. */
     val uploadProgress: Int? = null,
     /** For DM file decryption; not serialized over network. */
-    @kotlinx.serialization.Transient val dmEnvelope: DmEnvelope? = null
+    @kotlinx.serialization.Transient val dmEnvelope: DmEnvelope? = null,
+    /** Blurhashes for image files (by index); from decrypted message JSON. */
+    @kotlinx.serialization.Transient val fileThumbnails: List<String>? = null,
+    /** Aspect ratios (width/height) for image files (by index); from decrypted message JSON. */
+    @kotlinx.serialization.Transient val fileAspectRatios: List<Float>? = null
 )
 
 @Serializable

app/shared/src/commonMain/kotlin/ru/fromchat/ui/chat/AttachmentPreview.kt

@@ -1,16 +1,19 @@
 package ru.fromchat.ui.chat
 
 import androidx.compose.animation.AnimatedVisibility
-import androidx.compose.animation.core.animateFloatAsState
+import androidx.compose.animation.core.Animatable
 import androidx.compose.animation.core.tween
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
+import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.aspectRatio
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.sizeIn
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.AttachFile
@@ -21,26 +24,26 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 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.blur
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.layout.ContentScale
-import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.unit.dp
 import coil3.compose.AsyncImage
+import coil3.compose.rememberAsyncImagePainter
+import com.pr0gramm3r101.utils.crypto.Base64
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.async
-import kotlinx.coroutines.coroutineScope
-import kotlinx.coroutines.delay
 import kotlinx.coroutines.withContext
-import ru.fromchat.api.ApiClient
 import ru.fromchat.api.DmEnvelope
 import ru.fromchat.api.DmFile
+import ru.fromchat.core.Logger
 import ru.fromchat.crypto.decryptFile
 
 private val IMAGE_SIZE = 160.dp
@@ -57,6 +60,8 @@ fun AttachmentPreview(
     currentUserId: Int?,
     pendingFileUri: String?,
     isUploading: Boolean,
+    fileThumbnail: String? = null,
+    fileAspectRatio: Float? = null,
     modifier: Modifier = Modifier
 ) {
     val isImage = file?.let { isImageFilename(it.name) } ?: pendingFileUri?.let {
@@ -65,32 +70,45 @@ fun AttachmentPreview(
             it.endsWith(".gif", true) || it.endsWith(".webp", true)
     } ?: false
 
-    Box(
+    val baseModifier = modifier
-        modifier = modifier
+        .then(
-            .size(IMAGE_SIZE)
+            if (fileAspectRatio != null && fileAspectRatio > 0f) {
+                Modifier.aspectRatio(fileAspectRatio).sizeIn(maxWidth = IMAGE_SIZE, maxHeight = IMAGE_SIZE)
+            } else {
+                Modifier.size(IMAGE_SIZE)
+            }
+        )
         .clip(RoundedCornerShape(IMAGE_RADIUS))
-            .background(MaterialTheme.colorScheme.surfaceVariant),
+        .background(MaterialTheme.colorScheme.surfaceVariant)
+    Box(
+        modifier = baseModifier,
         contentAlignment = Alignment.Center
     ) {
         when {
             pendingFileUri != null -> {
+                Logger.d("AttachmentPreview", "Rendering: pendingFileUri, isUploading=$isUploading")
                 PendingImageContent(
                     uri = pendingFileUri,
                     isUploading = isUploading,
                     isImage = isImage
                 )
             }
-            file != null && isImage && dmEnvelope != null -> {
+            file != null && isImage && dmEnvelope != null && !fileThumbnail.isNullOrBlank() -> {
+                Logger.d("AttachmentPreview", "Rendering: DecryptedImageContent file=${file.name} thumbLen=${fileThumbnail.length} aspectRatio=$fileAspectRatio")
                 DecryptedImageContent(
                     file = file,
                     envelope = dmEnvelope,
-                    currentUserId = currentUserId
+                    currentUserId = currentUserId,
+                    thumbnailBase64 = fileThumbnail,
+                    aspectRatio = fileAspectRatio
                 )
             }
             file != null && !isImage -> {
+                Logger.d("AttachmentPreview", "Rendering: FileIconContent file=${file.name}")
                 FileIconContent(filename = file.name)
             }
             else -> {
+                Logger.d("AttachmentPreview", "Rendering: fallback Icon (file=$file, isImage=$isImage, hasEnvelope=${dmEnvelope != null}, thumbBlank=${fileThumbnail.isNullOrBlank()})")
                 Icon(
                     imageVector = Icons.Default.Image,
                     contentDescription = null,
@@ -165,65 +183,95 @@ private fun InfiniteCircularProgress() {
 private fun DecryptedImageContent(
     file: DmFile,
     envelope: DmEnvelope,
-    currentUserId: Int?
+    currentUserId: Int?,
+    thumbnailBase64: String,
+    aspectRatio: Float?
 ) {
-    var thumbnailBytes by remember(file.path) { mutableStateOf<ByteArray?>(null) }
     var fullBytes by remember(file.path) { mutableStateOf<ByteArray?>(null) }
-    var imageReadyToUnblur by remember(file.path) { mutableStateOf(false) }
+    val thumbnailBytes = remember(thumbnailBase64) {
+        runCatching { Base64.decode(thumbnailBase64) }.getOrNull()
+    }
 
     LaunchedEffect(file.path) {
+        Logger.d("AttachmentPreview", "DecryptedImageContent: fetching full image path=${file.path}")
         withContext(Dispatchers.Default) {
-            coroutineScope {
+            fullBytes = runCatching { decryptFile(file, envelope, currentUserId) }.getOrNull()
-                val thumbDeferred = async {
+            Logger.d("AttachmentPreview", "DecryptedImageContent: full image fetch done path=${file.path} success=${fullBytes != null} size=${fullBytes?.size ?: 0}")
-                    ApiClient.fetchThumbnail(file.path)
-                }
-                val fullDeferred = async {
-                    runCatching { decryptFile(file, envelope, currentUserId) }.getOrNull()
-                }
-                thumbnailBytes = thumbDeferred.await()
-                fullBytes = fullDeferred.await()
-            }
         }
     }
 
-    val hasThumb = thumbnailBytes != null
+    Box(modifier = Modifier.fillMaxSize()) {
-    val hasFull = fullBytes != null
+        when {
-    val showContent = hasThumb || hasFull
+            thumbnailBytes == null -> {
-
-    if (!showContent) {
                 Box(
                     modifier = Modifier.fillMaxSize(),
                     contentAlignment = Alignment.Center
                 ) {
-            CircularProgressIndicator(modifier = Modifier.size(24.dp))
+                    InfiniteCircularProgress()
-        }
-        return
-    }
-
-    LaunchedEffect(hasFull) {
-        if (hasFull) {
-            delay(80)
-            imageReadyToUnblur = true
                 }
             }
-    val blurProgress by animateFloatAsState(
+            else -> {
-        targetValue = if (imageReadyToUnblur) 0f else 1f,
+                val thumbPainter = rememberAsyncImagePainter(
-        animationSpec = tween(300),
+                    model = thumbnailBytes,
-        label = "blur"
+                    contentScale = ContentScale.Crop
                 )
-    val blurRadius = with(LocalDensity.current) { (blurProgress * 8.dp.toPx()).toDp() }
+                val thumbState by thumbPainter.state.collectAsState()
-    val displayBytes = fullBytes ?: thumbnailBytes!!
+                when (thumbState) {
-
+                    is coil3.compose.AsyncImagePainter.State.Loading -> {
-    Box(modifier = Modifier.fillMaxSize()) {
+                        Box(
-        AsyncImage(
+                            modifier = Modifier.fillMaxSize(),
-            model = displayBytes,
+                            contentAlignment = Alignment.Center
+                        ) {
+                            InfiniteCircularProgress()
+                        }
+                    }
+                    is coil3.compose.AsyncImagePainter.State.Success -> {
+                        Image(
+                            painter = thumbPainter,
                             contentDescription = file.name,
                             modifier = Modifier
                                 .fillMaxSize()
                                 .clip(RoundedCornerShape(IMAGE_RADIUS))
-                .then(if (blurProgress > 0.01f) Modifier.blur(blurRadius) else Modifier),
+                                .blur(8.dp),
                             contentScale = ContentScale.Crop
                         )
+                        if (fullBytes != null) {
+                            val fullPainter = rememberAsyncImagePainter(
+                                model = fullBytes,
+                                contentScale = ContentScale.Crop
+                            )
+                            val fullState by fullPainter.state.collectAsState()
+                            when (fullState) {
+                                is coil3.compose.AsyncImagePainter.State.Success -> {
+                                    val alpha = remember { Animatable(0f) }
+                                    LaunchedEffect(Unit) {
+                                        alpha.animateTo(1f, animationSpec = tween(300))
+                                    }
+                                    Image(
+                                        painter = fullPainter,
+                                        contentDescription = file.name,
+                                        modifier = Modifier
+                                            .fillMaxSize()
+                                            .clip(RoundedCornerShape(IMAGE_RADIUS))
+                                            .alpha(alpha.value),
+                                        contentScale = ContentScale.Crop
+                                    )
+                                }
+                                else -> { }
+                            }
+                        }
+                    }
+                    else -> {
+                        Box(
+                            modifier = Modifier.fillMaxSize(),
+                            contentAlignment = Alignment.Center
+                        ) {
+                            InfiniteCircularProgress()
+                        }
+                    }
+                }
+            }
+        }
     }
 }
 

app/shared/src/commonMain/kotlin/ru/fromchat/ui/chat/ChatPanel.kt

@@ -103,6 +103,24 @@ abstract class ChatPanel(
         }
     }
 
+    /**
+     * Add multiple messages at once. Use when loading history so the list is not shown
+     * until all messages (including thumbnails) are ready.
+     */
+    suspend fun addMessages(messages: List<Message>) {
+        if (messages.isEmpty()) return
+        addMessageMutex.withLock {
+            val existingIds = _state.messages.mapTo(mutableSetOf()) { it.id }
+            val newOnes = messages.filter { it.id !in existingIds }
+            if (newOnes.isNotEmpty()) {
+                updateState { currentState ->
+                    val newMessages = (currentState.messages + newOnes).sortedBy { it.timestamp }
+                    currentState.copy(messages = newMessages)
+                }
+            }
+        }
+    }
+
     /**
      * Update existing message (public for ChatScreen optimistic UI)
      */

app/shared/src/commonMain/kotlin/ru/fromchat/ui/chat/MessageItem.kt

@@ -211,13 +211,15 @@ fun MessageItem(
                                     modifier = Modifier.padding(horizontal = 12.dp, vertical = 4.dp)
                                 )
                             }
-                            message.files?.forEach { file ->
+                            message.files?.forEachIndexed { index, file ->
                                 AttachmentPreview(
                                     file = file,
                                     dmEnvelope = message.dmEnvelope,
                                     currentUserId = currentUserId,
                                     pendingFileUri = null,
                                     isUploading = false,
+                                    fileThumbnail = message.fileThumbnails?.getOrNull(index)?.takeIf { it.isNotBlank() },
+                                    fileAspectRatio = message.fileAspectRatios?.getOrNull(index)?.takeIf { it > 0f },
                                     modifier = Modifier.padding(horizontal = 12.dp, vertical = 4.dp)
                                 )
                             }

app/shared/src/commonMain/kotlin/ru/fromchat/ui/dm/DmPanel.kt

@@ -5,6 +5,8 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonElement
+import kotlinx.serialization.json.JsonArray
+import kotlinx.serialization.json.JsonPrimitive
 import kotlinx.serialization.json.jsonArray
 import kotlinx.serialization.json.jsonPrimitive
 import kotlinx.serialization.json.jsonObject
@@ -75,17 +77,24 @@ class DmPanel(
             ApiClient.getDmHistory(otherUserId)
         }.onSuccess { response ->
             clearMessages()
-            response.messages.mapNotNull { envelope ->
+            val decryptedForLog = mutableListOf<Pair<Int, String>>()
+            val messages = response.messages.mapNotNull { envelope ->
                 decryptEnvelope(envelope, currentUserId)?.let { plaintext ->
+                    decryptedForLog.add(envelope.id to plaintext)
                     createMessage(envelope, plaintext)
                 }
-            }.forEach { addMessage(it) }
-            response.messages.forEach { envelope ->
-                if (envelope.replyToId != null) {
-                    val replyTo = _state.messages.find { it.id == envelope.replyToId }
-                    updateMessage(envelope.id) { it.copy(reply_to = replyTo) }
             }
+            decryptedForLog.takeLast(5).forEachIndexed { i, (id, json) ->
+                Logger.d("DmPanel", "Decrypted message #${i + 1} (id=$id): $json")
             }
+            val replyToMap = messages.associateBy { it.id }
+            val messagesWithReplies = messages.map { msg ->
+                val envelope = response.messages.find { it.id == msg.id }
+                if (envelope?.replyToId != null) {
+                    msg.copy(reply_to = replyToMap[envelope.replyToId])
+                } else msg
+            }
+            addMessages(messagesWithReplies)
             setHasMoreMessages(false)
         }.onFailure { error ->
             Logger.e("DmPanel", "Failed to load DM history: ${error.message}", error)
@@ -167,14 +176,46 @@ class DmPanel(
         scope.launch(Dispatchers.Default) {
             val plaintext = runCatching { decryptEnvelope(envelope, currentUserId) }.getOrNull()
             if (plaintext != null) {
-                updateMessage(envelope.id) { it.copy(content = plaintext, is_edited = true) }
+                val (content, fileThumbnails, fileAspectRatios) = parseDecryptedContent(plaintext)
+                updateMessage(envelope.id) {
+                    it.copy(
+                        content = content,
+                        is_edited = true,
+                        fileThumbnails = fileThumbnails ?: it.fileThumbnails,
+                        fileAspectRatios = fileAspectRatios ?: it.fileAspectRatios
+                    )
+                }
             } else {
                 updateMessage(envelope.id) { it.copy(is_edited = true) }
             }
         }
     }
 
+    private fun parseDecryptedContent(plaintext: String): Triple<String, List<String>?, List<Float>?> {
+        return runCatching {
+            val obj = json.parseToJsonElement(plaintext).jsonObject
+            val text = obj["text"]?.jsonPrimitive?.content ?: return@runCatching Triple(plaintext, null, null)
+            val thumbArr = obj["fileThumbnails"]?.jsonArray ?: return@runCatching Triple(text, null, null)
+            val thumbnails = thumbArr.map { it.jsonPrimitive.content }
+            val arArr = obj["fileAspectRatios"]?.jsonArray
+            val aspectRatios = arArr?.mapNotNull { elem ->
+                val arr = elem as? JsonArray ?: return@mapNotNull null
+                if (arr.size == 2) {
+                    val w = (arr.getOrNull(0) as? JsonPrimitive)?.content?.toIntOrNull()
+                    val h = (arr.getOrNull(1) as? JsonPrimitive)?.content?.toIntOrNull()
+                    if (w != null && h != null && h > 0) w.toFloat() / h else null
+                } else null
+            }?.takeIf { it.size == thumbnails.size }
+            Logger.d("DmPanel", "parseDecryptedContent: thumbnails=${thumbnails.size} [${thumbnails.map { "len=${it.length}" }.joinToString()}], aspectRatios=${aspectRatios?.joinToString() ?: "null"}")
+            Triple(text, thumbnails.ifEmpty { null }, aspectRatios)
+        }.getOrElse {
+            Logger.d("DmPanel", "parseDecryptedContent: parse failed, using plaintext fallback")
+            Triple(plaintext, null, null)
+        }
+    }
+
     private fun createMessage(envelope: DmEnvelope, plaintext: String): Message {
+        val (content, fileThumbnails, fileAspectRatios) = parseDecryptedContent(plaintext)
         val username = if (envelope.senderId == currentUserId) {
             "You"
         } else {
@@ -183,7 +224,7 @@ class DmPanel(
         return Message(
             id = envelope.id,
             user_id = envelope.senderId,
-            content = plaintext,
+            content = content,
             timestamp = envelope.timestamp,
             is_read = envelope.recipientId == currentUserId,
             is_edited = false,
@@ -194,7 +235,9 @@ class DmPanel(
             client_message_id = null,
             reactions = null,
             files = envelope.files,
-            dmEnvelope = envelope
+            dmEnvelope = envelope,
+            fileThumbnails = fileThumbnails,
+            fileAspectRatios = fileAspectRatios
         )
     }
 

gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-agp = "9.0.0"
+agp = "9.0.1"
 androidx-activityCompose = "1.12.3"
 androidx-appcompat = "1.7.1"
 androidx-core-ktx = "1.17.0"