refactor: Projektstruktur in app/ und backend/ aufgeteilt

app/lib/models/chat_message.dart

@@ -0,0 +1,211 @@
+import 'package:votianlt_app/services/developer.dart' as developer;
+
+enum ChatDirection { incoming, outgoing }
+
+enum ChatMessageType { general, jobRelated }
+
+enum ChatContentType { text, image }
+
+ChatDirection chatDirectionFromString(
+  String? value, {
+  ChatDirection fallback = ChatDirection.incoming,
+}) {
+  switch (value?.toUpperCase()) {
+    case 'CLIENT':
+    case 'OUTGOING':
+      return ChatDirection.outgoing;
+    case 'SERVER':
+    case 'INCOMING':
+      return ChatDirection.incoming;
+    default:
+      return fallback;
+  }
+}
+
+String chatDirectionToString(ChatDirection direction) {
+  return direction == ChatDirection.outgoing ? 'CLIENT' : 'SERVER';
+}
+
+ChatMessageType chatMessageTypeFromString(
+  String? value, {
+  ChatMessageType fallback = ChatMessageType.general,
+}) {
+  switch (value?.toUpperCase()) {
+    case 'JOB_RELATED':
+      return ChatMessageType.jobRelated;
+    case 'GENERAL':
+      return ChatMessageType.general;
+    default:
+      return fallback;
+  }
+}
+
+String chatMessageTypeToString(ChatMessageType type) {
+  return type == ChatMessageType.jobRelated ? 'JOB_RELATED' : 'GENERAL';
+}
+
+ChatContentType chatContentTypeFromString(
+  String? value, {
+  ChatContentType fallback = ChatContentType.text,
+}) {
+  switch (value?.toUpperCase()) {
+    case 'IMAGE':
+      return ChatContentType.image;
+    case 'TEXT':
+      return ChatContentType.text;
+    default:
+      return fallback;
+  }
+}
+
+String chatContentTypeToString(ChatContentType type) {
+  return type == ChatContentType.image ? 'IMAGE' : 'TEXT';
+}
+
+class ChatMessage {
+  final String id;
+  final String content;
+  final DateTime createdAt;
+  final ChatDirection direction;
+  final ChatMessageType messageType;
+  final ChatContentType contentType;
+  final String? jobId;
+  final String? jobNumber;
+  final bool read;
+  final bool pendingSync;
+
+  const ChatMessage({
+    required this.id,
+    required this.content,
+    required this.createdAt,
+    required this.direction,
+    required this.messageType,
+    this.contentType = ChatContentType.text,
+    this.jobId,
+    this.jobNumber,
+    this.read = false,
+    this.pendingSync = false,
+  });
+
+  factory ChatMessage.fromJson(Map<String, dynamic> json) {
+    final rawId = (json['messageId'] ?? json['id'] ?? '').toString();
+    final rawContent = (json['content'] ?? json['text'] ?? '').toString();
+    final rawContentType = json['contentType']?.toString();
+
+    DateTime createdAt;
+    final createdAtRaw = json['createdAt'] ?? json['timestamp'];
+    if (createdAtRaw is DateTime) {
+      createdAt = createdAtRaw;
+    } else {
+      createdAt =
+          DateTime.tryParse(createdAtRaw?.toString() ?? '') ?? DateTime.now();
+    }
+
+    var direction = chatDirectionFromString(
+      json['origin']?.toString() ?? json['direction']?.toString(),
+      fallback:
+          json['isOwn'] == true
+              ? ChatDirection.outgoing
+              : ChatDirection.incoming,
+    );
+
+    var messageType = chatMessageTypeFromString(
+      json['messageType']?.toString(),
+      fallback:
+          ((json['jobId']?.toString().isNotEmpty ?? false) ||
+                  (json['jobNumber']?.toString().isNotEmpty ?? false))
+              ? ChatMessageType.jobRelated
+              : ChatMessageType.general,
+    );
+
+    final jobIdRaw = json['jobId']?.toString();
+    final jobNumberRaw = json['jobNumber']?.toString();
+    final jobId = jobIdRaw?.trim();
+    final jobNumber = jobNumberRaw?.trim();
+
+    if (rawId.isEmpty || rawContent.isEmpty) {
+      developer.log(
+        'Invalid ChatMessage payload (one or more required fields missing): $json',
+      );
+    }
+
+    return ChatMessage(
+      id: rawId,
+      content: rawContent,
+      createdAt: createdAt,
+      direction: direction,
+      messageType: messageType,
+      contentType: chatContentTypeFromString(rawContentType),
+      jobId: jobId?.isEmpty ?? true ? null : jobId,
+      jobNumber: jobNumber?.isEmpty ?? true ? null : jobNumber,
+      read: json['read'] == true,
+      pendingSync: json['pendingSync'] == true,
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    final map = <String, dynamic>{
+      'messageId': id,
+      'content': content,
+      'origin': chatDirectionToString(direction),
+      'messageType': chatMessageTypeToString(messageType),
+      'contentType': chatContentTypeToString(contentType),
+      'createdAt': createdAt.toIso8601String(),
+      'read': read,
+    };
+
+    if (jobId != null && jobId!.isNotEmpty) {
+      map['jobId'] = jobId;
+    }
+    if (jobNumber != null && jobNumber!.isNotEmpty) {
+      map['jobNumber'] = jobNumber;
+    }
+    if (pendingSync) {
+      map['pendingSync'] = true;
+    }
+
+    return map;
+  }
+
+  bool get isOwn => direction == ChatDirection.outgoing;
+
+  ChatMessage copyWith({
+    String? id,
+    String? content,
+    DateTime? createdAt,
+    ChatDirection? direction,
+    ChatMessageType? messageType,
+    ChatContentType? contentType,
+    String? jobId,
+    String? jobNumber,
+    bool? read,
+    bool? pendingSync,
+  }) {
+    return ChatMessage(
+      id: id ?? this.id,
+      content: content ?? this.content,
+      createdAt: createdAt ?? this.createdAt,
+      direction: direction ?? this.direction,
+      messageType: messageType ?? this.messageType,
+      contentType: contentType ?? this.contentType,
+      jobId: jobId ?? this.jobId,
+      jobNumber: jobNumber ?? this.jobNumber,
+      read: read ?? this.read,
+      pendingSync: pendingSync ?? this.pendingSync,
+    );
+  }
+
+  @override
+  String toString() {
+    return 'ChatMessage(id: $id, direction: $direction, messageType: $messageType, contentType: $contentType, createdAt: $createdAt)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+    return other is ChatMessage && other.id == id;
+  }
+
+  @override
+  int get hashCode => id.hashCode;
+}