ui: Add a basic implementation of the video inline widget

lib/main.dart

@@ -31,6 +31,7 @@ import "package:moxxyv2/ui/bloc/profile_bloc.dart";
 import "package:moxxyv2/ui/bloc/preferences_bloc.dart";
 import "package:moxxyv2/ui/bloc/addcontact_bloc.dart";
 import "package:moxxyv2/ui/service/download.dart";
+import "package:moxxyv2/ui/service/data.dart";
 import "package:moxxyv2/service/service.dart";
 import "package:moxxyv2/shared/commands.dart";
 import "package:moxxyv2/shared/events.dart";
@@ -51,8 +52,10 @@ void setupLogging() {
   GetIt.I.registerSingleton<Logger>(Logger("MoxxyMain"));
 }
 
-void setupUIServices() {
+Future<void> setupUIServices() async {
   GetIt.I.registerSingleton<UIDownloadService>(UIDownloadService());
+  GetIt.I.registerSingleton<UIDataService>(UIDataService());
+  await GetIt.I.get<UIDataService>().init();
 }
 
 void setupBlocs(GlobalKey<NavigatorState> navKey) {
@@ -71,7 +74,7 @@ void setupBlocs(GlobalKey<NavigatorState> navKey) {
 // TODO: Theme the switches
 void main() async {
   setupLogging();
-  setupUIServices();
+  await setupUIServices();
   
   await initializeServiceIfNeeded();
   setupEventHandler();

lib/shared/helpers.dart

@@ -144,6 +144,7 @@ String? guessMimeTypeFromExtension(String ext) {
     case "jpg":
     case "jpeg": return "image/jpeg";
     case "webp": return "image/webp";
+    case "mp4": return "video/mp4";
   }
 
   return null;

lib/ui/service/data.dart

@@ -0,0 +1,19 @@
+import "package:flutter/material.dart";
+import "package:external_path/external_path.dart";
+import "package:path/path.dart" as pathlib;
+
+class UIDataService {
+  late String _thumbnailBase;
+
+  UIDataService();
+
+  Future<void> init() async {
+    WidgetsFlutterBinding.ensureInitialized();
+
+    final base = await ExternalPath.getExternalStoragePublicDirectory(ExternalPath.DIRECTORY_PICTURES);
+    _thumbnailBase = pathlib.join(base, "Moxxy", ".thumbnail");
+  }
+
+  // The base path for thumbnails
+  String get thumbnailBase => _thumbnailBase;
+}

lib/ui/widgets/chat/media/video.dart

@@ -1,15 +1,17 @@
 import "dart:io";
 
 import "package:moxxyv2/shared/models/message.dart";
+import "package:moxxyv2/ui/service/data.dart";
 import "package:moxxyv2/ui/widgets/chat/bottom.dart";
 import "package:moxxyv2/ui/widgets/chat/blurhash.dart";
 import "package:moxxyv2/ui/widgets/chat/playbutton.dart";
 import "package:moxxyv2/ui/widgets/chat/helpers.dart";
 import "package:moxxyv2/ui/widgets/chat/media/image.dart";
+import "package:moxxyv2/ui/widgets/chat/media/file.dart";
 
 import "package:flutter/material.dart";
 import "package:path/path.dart" as pathlib;
-import "package:external_path/external_path.dart";
+import "package:get_it/get_it.dart";
 import "package:video_compress/video_compress.dart";
 import "package:open_file/open_file.dart";
 
@@ -45,42 +47,93 @@ class _VideoChatWidgetState extends State<VideoChatWidget> {
   final double maxWidth;
   final Message message;
 
-  String _thumbnailPath;
-  bool _hasThumbnail;
-
   _VideoChatWidgetState(
     this.message,
     this.maxWidth,
     this.timestamp,
     this.radius,
-  ) : _thumbnailPath = "", _hasThumbnail = true;
+  );
 
-  Future<String> _getThumbnailPath() async {
-    final base = await ExternalPath.getExternalStoragePublicDirectory(ExternalPath.DIRECTORY_PICTURES);
-    return pathlib.join(base, "Moxxy", ".thumbnail", message.conversationJid, pathlib.basename(message.mediaUrl!));
+  /// Returns the path of a possible thumbnail for the video. Does not imply that the file
+  /// exists.
+  String _getThumbnailPath() {
+    final base = GetIt.I.get<UIDataService>().thumbnailBase;
+    return pathlib.join(base, message.conversationJid, pathlib.basename(message.mediaUrl!));
+  }
+
+  /// Generate the thumbnail if needed.
+  Future<bool> _thumbnailFuture() async {
+    final thumbnailFile = File(_getThumbnailPath());
+    if (await thumbnailFile.exists()) {
+      return true;
+    }
+
+    // Thumbnail does not exist
+    final sourceFile = File(message.mediaUrl!);
+    if (await sourceFile.exists()) {
+      final bytes = await VideoCompress.getByteThumbnail(
+        sourceFile.path,
+        quality: 75
+      );
+      await thumbnailFile.writeAsBytes(bytes!);
+
+      return true;
+    }
+
+    // Source file also does not exist. Return "error".
+    return false;
   }
   
   Widget _buildNonDownloaded() {
     // TODO
-    return const SizedBox();
+    if (message.thumbnailData != null) {}
+
+    return FileChatWidget(
+      message,
+      timestamp,
+      extra: ElevatedButton(
+        // TODO
+        onPressed: () {},
+        child: const Text("Download")
+      )
+    );
   }
 
   Widget _buildDownloading() {
     // TODO
-    return const SizedBox();
+    if (message.thumbnailData != null) {}
+
+    return FileChatWidget(
+      message,
+      timestamp,
+    );
   }
 
   Widget _buildVideo() {
+    return FutureBuilder<bool>(
+      future: _thumbnailFuture(),
+      builder: (context, snapshot) {
+        if (snapshot.connectionState == ConnectionState.done) {
+          if (snapshot.data!) {
             return ImageBaseChatWidget(
               message.mediaUrl!,
               radius,
-      Image.file(File(message.mediaUrl!)),
+              Image.file(File(_getThumbnailPath())),
               MessageBubbleBottom(
                 message,
                 timestamp: timestamp,
               ),
               extra: const PlayButton()
             );
+          } else {
+            // TODO: Error
+            return const Text("Error");
+          }
+        } else {
+          return const CircularProgressIndicator();
+        }
+      }
+    );
   }
 
   Widget _innerBuild() {