import 'package:hive_ce/hive.dart';
import 'package:retail/core/constants/storage_constants.dart';
import 'package:retail/features/home/data/models/cart_item_model.dart';

part 'transaction_model.g.dart';

/// Transaction model with Hive CE type adapter
@HiveType(typeId: StorageConstants.transactionTypeId)
class TransactionModel extends HiveObject {
  /// Unique transaction identifier
  @HiveField(0)
  final String id;

  /// List of cart items in this transaction
  @HiveField(1)
  final List<CartItemModel> items;

  /// Subtotal amount (before tax and discount)
  @HiveField(2)
  final double subtotal;

  /// Tax amount
  @HiveField(3)
  final double tax;

  /// Discount amount
  @HiveField(4)
  final double discount;

  /// Total amount (subtotal + tax - discount)
  @HiveField(5)
  final double total;

  /// Transaction completion timestamp
  @HiveField(6)
  final DateTime completedAt;

  /// Payment method used (e.g., 'cash', 'card', 'digital')
  @HiveField(7)
  final String paymentMethod;

  TransactionModel({
    required this.id,
    required this.items,
    required this.subtotal,
    required this.tax,
    required this.discount,
    required this.total,
    required this.completedAt,
    required this.paymentMethod,
  });

  /// Get total number of items in transaction
  int get totalItems => items.fold(0, (sum, item) => sum + item.quantity);

  /// Create a copy with updated fields
  TransactionModel copyWith({
    String? id,
    List<CartItemModel>? items,
    double? subtotal,
    double? tax,
    double? discount,
    double? total,
    DateTime? completedAt,
    String? paymentMethod,
  }) {
    return TransactionModel(
      id: id ?? this.id,
      items: items ?? this.items,
      subtotal: subtotal ?? this.subtotal,
      tax: tax ?? this.tax,
      discount: discount ?? this.discount,
      total: total ?? this.total,
      completedAt: completedAt ?? this.completedAt,
      paymentMethod: paymentMethod ?? this.paymentMethod,
    );
  }

  /// Convert to JSON
  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'items': items.map((item) => item.toJson()).toList(),
      'subtotal': subtotal,
      'tax': tax,
      'discount': discount,
      'total': total,
      'completedAt': completedAt.toIso8601String(),
      'paymentMethod': paymentMethod,
    };
  }

  /// Create from JSON
  factory TransactionModel.fromJson(Map<String, dynamic> json) {
    return TransactionModel(
      id: json['id'] as String,
      items: (json['items'] as List)
          .map((item) => CartItemModel.fromJson(item as Map<String, dynamic>))
          .toList(),
      subtotal: (json['subtotal'] as num).toDouble(),
      tax: (json['tax'] as num).toDouble(),
      discount: (json['discount'] as num).toDouble(),
      total: (json['total'] as num).toDouble(),
      completedAt: DateTime.parse(json['completedAt'] as String),
      paymentMethod: json['paymentMethod'] as String,
    );
  }

  @override
  String toString() {
    return 'TransactionModel(id: $id, total: $total, items: ${items.length}, method: $paymentMethod)';
  }

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) return true;

    return other is TransactionModel && other.id == id;
  }

  @override
  int get hashCode => id.hashCode;
}