init

lib/models/support_message.dart

@@ -0,0 +1,69 @@
+import 'support_ticket.dart';
+
+const maxReplyLength = 4000;
+
+class SupportMessage {
+  const SupportMessage({
+    required this.id,
+    required this.ticketId,
+    required this.authorKind,
+    required this.authorName,
+    required this.body,
+    required this.createdAt,
+  });
+
+  final String id;
+  final String ticketId;
+  final String authorKind;
+  final String authorName;
+  final String body;
+  final DateTime createdAt;
+
+  bool get isStaff => authorKind == 'staff';
+
+  factory SupportMessage.fromJson(Map<String, dynamic> json) {
+    return SupportMessage(
+      id: json['id'] as String,
+      ticketId: json['ticketId'] as String,
+      authorKind: json['authorKind'] as String? ?? 'player',
+      authorName: json['authorName'] as String? ?? '',
+      body: json['body'] as String? ?? '',
+      createdAt: DateTime.parse(json['createdAt'] as String),
+    );
+  }
+}
+
+class SupportThread {
+  const SupportThread({required this.ticket, required this.messages});
+
+  final SupportTicket ticket;
+  final List<SupportMessage> messages;
+
+  factory SupportThread.fromJson(Map<String, dynamic> json) {
+    final ticketJson = json['ticket'];
+    final messagesJson = json['messages'];
+    if (ticketJson is! Map || messagesJson is! List) {
+      throw const FormatException('Unexpected thread payload');
+    }
+    return SupportThread(
+      ticket: SupportTicket.fromJson(Map<String, dynamic>.from(ticketJson)),
+      messages: [
+        for (final item in messagesJson)
+          if (item is Map)
+            SupportMessage.fromJson(Map<String, dynamic>.from(item)),
+      ],
+    );
+  }
+}
+
+/// Returns an error message when [raw] is not 1–4000 characters after trim.
+String? validateReplyBody(String raw) {
+  final body = raw.trim();
+  if (body.isEmpty) {
+    return 'Enter a message.';
+  }
+  if (body.length > maxReplyLength) {
+    return 'Message must be $maxReplyLength characters or fewer.';
+  }
+  return null;
+}