/// مدل خط شخص در سند دریافت/پرداخت
class PersonLine {
  final int id;
  final int? personId;
  final String? personName;
  final double amount;
  final String? description;
  final Map<String, dynamic>? extraInfo;

  const PersonLine({
    required this.id,
    this.personId,
    this.personName,
    required this.amount,
    this.description,
    this.extraInfo,
  });

  factory PersonLine.fromJson(Map<String, dynamic> json) {
    return PersonLine(
      id: json['id'] ?? 0,
      personId: json['person_id'],
      personName: json['person_name'],
      amount: (json['amount'] ?? 0).toDouble(),
      description: json['description'],
      extraInfo: json['extra_info'],
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'person_id': personId,
      'person_name': personName,
      'amount': amount,
      'description': description,
      'extra_info': extraInfo,
    };
  }
}

/// مدل خط حساب در سند دریافت/پرداخت
class AccountLine {
  final int id;
  final int accountId;
  final String accountName;
  final String accountCode;
  final String? accountType;
  final double amount;
  final String? description;
  final String? transactionType;
  final DateTime? transactionDate;
  final double? commission;
  final Map<String, dynamic>? extraInfo;

  const AccountLine({
    required this.id,
    required this.accountId,
    required this.accountName,
    required this.accountCode,
    this.accountType,
    required this.amount,
    this.description,
    this.transactionType,
    this.transactionDate,
    this.commission,
    this.extraInfo,
  });

  factory AccountLine.fromJson(Map<String, dynamic> json) {
    return AccountLine(
      id: json['id'] ?? 0,
      accountId: json['account_id'] ?? 0,
      accountName: json['account_name'] ?? '',
      accountCode: json['account_code'] ?? '',
      accountType: json['account_type'],
      amount: (json['amount'] ?? 0).toDouble(),
      description: json['description'],
      transactionType: json['transaction_type'],
      transactionDate: json['transaction_date'] != null 
          ? DateTime.tryParse(json['transaction_date']) 
          : null,
      commission: json['commission']?.toDouble(),
      extraInfo: json['extra_info'],
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'account_id': accountId,
      'account_name': accountName,
      'account_code': accountCode,
      'account_type': accountType,
      'amount': amount,
      'description': description,
      'transaction_type': transactionType,
      'transaction_date': transactionDate?.toIso8601String(),
      'commission': commission,
      'extra_info': extraInfo,
    };
  }
}

/// مدل سند دریافت/پرداخت
class ReceiptPaymentDocument {
  final int id;
  final String code;
  final int businessId;
  final String documentType; // 'receipt' or 'payment'
  final DateTime documentDate;
  final DateTime registeredAt;
  final int currencyId;
  final String? currencyCode;
  final int createdByUserId;
  final String? createdByName;
  final bool isProforma;
  final Map<String, dynamic>? extraInfo;
  final List<PersonLine> personLines;
  final List<AccountLine> accountLines;
  final String? personNames;
  final DateTime createdAt;
  final DateTime updatedAt;

  const ReceiptPaymentDocument({
    required this.id,
    required this.code,
    required this.businessId,
    required this.documentType,
    required this.documentDate,
    required this.registeredAt,
    required this.currencyId,
    this.currencyCode,
    required this.createdByUserId,
    this.createdByName,
    required this.isProforma,
    this.extraInfo,
    required this.personLines,
    required this.accountLines,
    this.personNames,
    required this.createdAt,
    required this.updatedAt,
  });

  factory ReceiptPaymentDocument.fromJson(Map<String, dynamic> json) {
    return ReceiptPaymentDocument(
      id: json['id'] ?? 0,
      code: json['code'] ?? '',
      businessId: json['business_id'] ?? 0,
      documentType: json['document_type'] ?? '',
      documentDate: DateTime.tryParse(json['document_date'] ?? '') ?? DateTime.now(),
      registeredAt: DateTime.tryParse(json['registered_at'] ?? '') ?? DateTime.now(),
      currencyId: json['currency_id'] ?? 0,
      currencyCode: json['currency_code'],
      createdByUserId: json['created_by_user_id'] ?? 0,
      createdByName: json['created_by_name'],
      isProforma: json['is_proforma'] ?? false,
      extraInfo: json['extra_info'],
      personLines: (json['person_lines'] as List<dynamic>?)
          ?.map((item) => PersonLine.fromJson(item))
          .toList() ?? [],
      accountLines: (json['account_lines'] as List<dynamic>?)
          ?.map((item) => AccountLine.fromJson(item))
          .toList() ?? [],
      personNames: json['person_names'],
      createdAt: DateTime.tryParse(json['created_at'] ?? '') ?? DateTime.now(),
      updatedAt: DateTime.tryParse(json['updated_at'] ?? '') ?? DateTime.now(),
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'code': code,
      'business_id': businessId,
      'document_type': documentType,
      'document_date': documentDate.toIso8601String(),
      'registered_at': registeredAt.toIso8601String(),
      'currency_id': currencyId,
      'currency_code': currencyCode,
      'created_by_user_id': createdByUserId,
      'created_by_name': createdByName,
      'is_proforma': isProforma,
      'extra_info': extraInfo,
      'person_lines': personLines.map((item) => item.toJson()).toList(),
      'account_lines': accountLines.map((item) => item.toJson()).toList(),
      'person_names': personNames,
      'created_at': createdAt.toIso8601String(),
      'updated_at': updatedAt.toIso8601String(),
    };
  }

  /// محاسبه مجموع مبلغ کل
  double get totalAmount {
    return personLines.fold(0.0, (sum, line) => sum + line.amount);
  }

  /// تعداد خطوط اشخاص
  int get personLinesCount => personLines.length;

  /// تعداد خطوط حساب‌ها
  int get accountLinesCount => accountLines.length;

  /// آیا سند دریافت است؟
  bool get isReceipt => documentType == 'receipt';

  /// آیا سند پرداخت است؟
  bool get isPayment => documentType == 'payment';

  /// دریافت نام نوع سند
  String get documentTypeName {
    switch (documentType) {
      case 'receipt':
        return 'دریافت';
      case 'payment':
        return 'پرداخت';
      default:
        return documentType;
    }
  }
}