import 'package:flutter/material.dart';

class NotificationModel {
  final String id;
  final String type;
  final String userId;
  final String? groupId;
  final String? groupName;
  final String? paymentId;
  final String? drawId;
  final String channel;
  final String title;
  final String message;
  final String status;
  final int? daysBeforeDue;
  final String priority;
  final DateTime? sentAt;
  final DateTime? readAt;
  final String? failureReason;
  final Map<String, dynamic>? metadata;
  final DateTime createdAt;
  final DateTime updatedAt;

  NotificationModel({
    required this.id,
    required this.type,
    required this.userId,
    this.groupId,
    this.groupName,
    this.paymentId,
    this.drawId,
    required this.channel,
    required this.title,
    required this.message,
    required this.status,
    this.daysBeforeDue,
    required this.priority,
    this.sentAt,
    this.readAt,
    this.failureReason,
    this.metadata,
    required this.createdAt,
    required this.updatedAt,
  });

  bool get isUnread => readAt == null && status == 'sent';
  bool get isRead => readAt != null;
  bool get isPending => status == 'pending';
  bool get isFailed => status == 'failed';

  factory NotificationModel.fromJson(Map<String, dynamic> json) {
    return NotificationModel(
      id: json['id'] ?? '',
      type: json['type'] ?? '',
      userId: json['user_id'] ?? '',
      groupId: json['group_id'],
      groupName: json['group']?['name'],
      paymentId: json['payment_id'],
      drawId: json['draw_id'],
      channel: json['channel'] ?? '',
      title: json['title'] ?? '',
      message: json['message'] ?? '',
      status: json['status'] ?? 'pending',
      daysBeforeDue: json['days_before_due'],
      priority: json['priority'] ?? 'medium',
      sentAt: json['sent_at'] != null ? DateTime.parse(json['sent_at']) : null,
      readAt: json['read_at'] != null ? DateTime.parse(json['read_at']) : null,
      failureReason: json['failure_reason'],
      metadata: json['metadata'],
      createdAt: DateTime.parse(json['createdAt'] ?? json['created_at']),
      updatedAt: DateTime.parse(json['updatedAt'] ?? json['updated_at']),
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'type': type,
      'user_id': userId,
      'group_id': groupId,
      'payment_id': paymentId,
      'draw_id': drawId,
      'channel': channel,
      'title': title,
      'message': message,
      'status': status,
      'days_before_due': daysBeforeDue,
      'priority': priority,
      'sent_at': sentAt?.toIso8601String(),
      'read_at': readAt?.toIso8601String(),
      'failure_reason': failureReason,
      'metadata': metadata,
      'createdAt': createdAt.toIso8601String(),
      'updatedAt': updatedAt.toIso8601String(),
    };
  }

  // Get icon based on notification type
  IconData getIcon() {
    switch (type) {
      case 'payment_reminder':
      case 'payment_overdue':
        return Icons.payment_rounded;
      case 'payment_confirmation':
        return Icons.check_circle_rounded;
      case 'draw_result':
        return Icons.casino_rounded;
      case 'group_invite':
        return Icons.group_add_rounded;
      case 'member_joined':
        return Icons.person_add_rounded;
      case 'member_removed':
        return Icons.person_remove_rounded;
      case 'group_started':
      case 'group_completed':
        return Icons.flag_rounded;
      case 'welcome_message':
        return Icons.waving_hand_rounded;
      case 'manager_notification':
        return Icons.admin_panel_settings_rounded;
      case 'system_alert':
        return Icons.warning_rounded;
      default:
        return Icons.notifications_rounded;
    }
  }

  // Get color based on notification type
  Color getColor() {
    switch (type) {
      case 'payment_reminder':
        return const Color(0xFFF57C00); // Orange
      case 'payment_overdue':
        return const Color(0xFFD32F2F); // Red
      case 'payment_confirmation':
        return const Color(0xFF2E7D32); // Green
      case 'draw_result':
        return const Color(0xFF1976D2); // Blue
      case 'group_invite':
      case 'member_joined':
        return const Color(0xFF4CAF50); // Light green
      case 'member_removed':
        return const Color(0xFF757575); // Gray
      case 'group_started':
      case 'group_completed':
        return const Color(0xFF7B1FA2); // Purple
      case 'welcome_message':
        return const Color(0xFF00BCD4); // Cyan
      case 'system_alert':
        return const Color(0xFFFF5722); // Deep orange
      default:
        return const Color(0xFF757575); // Gray
    }
  }

  // Get formatted time ago
  String getTimeAgo() {
    final now = DateTime.now();
    final difference = now.difference(createdAt);

    if (difference.inSeconds < 60) {
      return 'Just now';
    } else if (difference.inMinutes < 60) {
      return '${difference.inMinutes}m ago';
    } else if (difference.inHours < 24) {
      return '${difference.inHours}h ago';
    } else if (difference.inDays < 7) {
      return '${difference.inDays}d ago';
    } else if (difference.inDays < 30) {
      return '${(difference.inDays / 7).floor()}w ago';
    } else {
      return '${(difference.inDays / 30).floor()}mo ago';
    }
  }

  NotificationModel copyWith({
    String? id,
    String? type,
    String? userId,
    String? groupId,
    String? groupName,
    String? paymentId,
    String? drawId,
    String? channel,
    String? title,
    String? message,
    String? status,
    int? daysBeforeDue,
    String? priority,
    DateTime? sentAt,
    DateTime? readAt,
    String? failureReason,
    Map<String, dynamic>? metadata,
    DateTime? createdAt,
    DateTime? updatedAt,
  }) {
    return NotificationModel(
      id: id ?? this.id,
      type: type ?? this.type,
      userId: userId ?? this.userId,
      groupId: groupId ?? this.groupId,
      groupName: groupName ?? this.groupName,
      paymentId: paymentId ?? this.paymentId,
      drawId: drawId ?? this.drawId,
      channel: channel ?? this.channel,
      title: title ?? this.title,
      message: message ?? this.message,
      status: status ?? this.status,
      daysBeforeDue: daysBeforeDue ?? this.daysBeforeDue,
      priority: priority ?? this.priority,
      sentAt: sentAt ?? this.sentAt,
      readAt: readAt ?? this.readAt,
      failureReason: failureReason ?? this.failureReason,
      metadata: metadata ?? this.metadata,
      createdAt: createdAt ?? this.createdAt,
      updatedAt: updatedAt ?? this.updatedAt,
    );
  }
}