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| | import 'package:uuid/uuid.dart';
| |
| | enum MessageRole { user, assistant, system }
| |
| | enum MessageType { text, voice, image }
| |
| | enum MessageStatus { sending, sent, error }
| |
| | class Message {
| | final String id;
| | final MessageRole role;
| | final MessageType type;
| | final String content;
| | final String? audioUri;
| | final String? imageBase64;
| | final String? mimeType;
| | final int timestamp;
| | final MessageStatus? status;
| | final int? duration;
| |
| | const Message({
| | required this.id,
| | required this.role,
| | required this.type,
| | required this.content,
| | required this.timestamp,
| | this.audioUri,
| | this.imageBase64,
| | this.mimeType,
| | this.status,
| | this.duration,
| | });
| |
| | factory Message.text({
| | required MessageRole role,
| | required String content,
| | MessageStatus? status,
| | }) {
| | return Message(
| | id: const Uuid().v4(),
| | role: role,
| | type: MessageType.text,
| | content: content,
| | timestamp: DateTime.now().millisecondsSinceEpoch,
| | status: status,
| | );
| | }
| |
| | factory Message.voice({
| | required MessageRole role,
| | required String audioUri,
| | String content = '',
| | int? duration,
| | MessageStatus? status,
| | }) {
| | return Message(
| | id: const Uuid().v4(),
| | role: role,
| | type: MessageType.voice,
| | content: content,
| | audioUri: audioUri,
| | timestamp: DateTime.now().millisecondsSinceEpoch,
| | duration: duration,
| | status: status,
| | );
| | }
| |
| | factory Message.image({
| | required MessageRole role,
| | required String imageBase64,
| | String content = '',
| | String? mimeType,
| | MessageStatus? status,
| | }) {
| | return Message(
| | id: const Uuid().v4(),
| | role: role,
| | type: MessageType.image,
| | content: content,
| | imageBase64: imageBase64,
| | mimeType: mimeType,
| | timestamp: DateTime.now().millisecondsSinceEpoch,
| | status: status,
| | );
| | }
| |
| | Message copyWith({
| | String? content,
| | String? audioUri,
| | String? imageBase64,
| | String? mimeType,
| | MessageStatus? status,
| | int? duration,
| | }) {
| | return Message(
| | id: id,
| | role: role,
| | type: type,
| | content: content ?? this.content,
| | audioUri: audioUri ?? this.audioUri,
| | imageBase64: imageBase64 ?? this.imageBase64,
| | mimeType: mimeType ?? this.mimeType,
| | timestamp: timestamp,
| | status: status ?? this.status,
| | duration: duration ?? this.duration,
| | );
| | }
| |
| | Map<String, dynamic> toJson() {
| | return {
| | 'id': id,
| | 'role': role.name,
| | 'type': type.name,
| | 'content': content,
| | if (audioUri != null) 'audioUri': audioUri,
| | if (imageBase64 != null) 'imageBase64': imageBase64,
| | if (mimeType != null) 'mimeType': mimeType,
| | 'timestamp': timestamp,
| | if (status != null) 'status': status!.name,
| | if (duration != null) 'duration': duration,
| | };
| | }
| |
| | /// Lightweight JSON for persistence (strips base64 audio, keeps file paths and images).
| | Map<String, dynamic> toJsonLight() {
| | // Keep audioUri if it's a file path (starts with '/') — these are saved audio files.
| | // Strip base64 audio data (large, temp) — those won't survive restart.
| | final keepAudio = audioUri != null && audioUri!.startsWith('/');
| | return {
| | 'id': id,
| | 'role': role.name,
| | 'type': type.name,
| | 'content': content,
| | if (keepAudio) 'audioUri': audioUri,
| | 'timestamp': timestamp,
| | if (status != null) 'status': status!.name,
| | if (duration != null) 'duration': duration,
| | // Keep imageBase64 — images are typically 50-200 KB and must survive restart.
| | if (imageBase64 != null) 'imageBase64': imageBase64,
| | if (mimeType != null) 'mimeType': mimeType,
| | };
| | }
| |
| | factory Message.fromJson(Map<String, dynamic> json) {
| | return Message(
| | id: json['id'] as String,
| | role: MessageRole.values.byName(json['role'] as String),
| | type: MessageType.values.byName(json['type'] as String),
| | content: json['content'] as String? ?? '',
| | audioUri: json['audioUri'] as String?,
| | imageBase64: json['imageBase64'] as String?,
| | mimeType: json['mimeType'] as String?,
| | timestamp: json['timestamp'] as int,
| | status: json['status'] != null
| | ? MessageStatus.values.byName(json['status'] as String)
| | : null,
| | duration: json['duration'] as int?,
| | );
| | }
| |
| | /// Returns true if this is a voice message that has neither audio nor text.
| | bool get isEmptyVoice =>
| | type == MessageType.voice &&
| | (audioUri == null || audioUri!.isEmpty) &&
| | content.isEmpty;
| |
| | /// Returns true if this is a text message with no content (empty bubble).
| | bool get isEmptyText =>
| | type == MessageType.text &&
| | content.trim().isEmpty &&
| | imageBase64 == null;
| | }
|
|
