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;
}