import 'purchase_order_item.dart';
import 'vendor.dart';

class PurchaseOrder {
  final int? id;
  final int? userId;
  final int? vendorId;
  final String poNumber;
  final DateTime issueDate;
  final DateTime? dueDate;
  final double subtotal;
  final double taxTotal;
  final double discountTotal;
  final double totalAmount;
  final String status;
  final String? notes;
  final DateTime? createdAt;
  final DateTime? updatedAt;
  final DateTime? poDate;
  final double amountPaid;
  final DateTime? nextPaymentDate;
  final String? vendorInvoiceUrl;
  final List<PurchaseOrderItem> items;
  final Vendor? vendor;

  PurchaseOrder({
    this.id,
    this.userId,
    this.vendorId,
    required this.poNumber,
    required this.issueDate,
    this.dueDate,
    this.subtotal = 0.0,
    this.taxTotal = 0.0,
    this.discountTotal = 0.0,
    this.totalAmount = 0.0,
    this.status = 'PENDING',
    this.notes,
    this.createdAt,
    this.updatedAt,
    this.poDate,
    this.amountPaid = 0.0,
    this.nextPaymentDate,
    this.vendorInvoiceUrl,
    this.items = const [],
    this.vendor,
  });

  factory PurchaseOrder.fromJson(Map<String, dynamic> json) {
    return PurchaseOrder(
      id: json['id'],
      userId: json['userId'],
      vendorId: json['vendorId'],
      poNumber: json['poNumber'] ?? '',
      issueDate: json['issueDate'] != null ? DateTime.parse(json['issueDate']) : DateTime.now(),
      dueDate: json['dueDate'] != null ? DateTime.parse(json['dueDate']) : null,
      subtotal: (json['subtotal'] ?? 0.0).toDouble(),
      taxTotal: (json['taxTotal'] ?? 0.0).toDouble(),
      discountTotal: (json['discountTotal'] ?? 0.0).toDouble(),
      totalAmount: (json['totalAmount'] ?? 0.0).toDouble(),
      status: json['status'] ?? 'PENDING',
      notes: json['notes'],
      createdAt: json['createdAt'] != null ? DateTime.parse(json['createdAt']) : null,
      updatedAt: json['updatedAt'] != null ? DateTime.parse(json['updatedAt']) : null,
      poDate: json['poDate'] != null ? DateTime.parse(json['poDate']) : null,
      amountPaid: (json['amountPaid'] ?? 0.0).toDouble(),
      nextPaymentDate: json['nextPaymentDate'] != null ? DateTime.parse(json['nextPaymentDate']) : null,
      vendorInvoiceUrl: json['vendorInvoiceUrl'],
      items: json['items'] != null ? (json['items'] as List).map((i) => PurchaseOrderItem.fromJson(i)).toList() : [],
      vendor: json['vendor'] != null ? Vendor.fromJson(json['vendor']) : null,
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'userId': userId,
      'vendorId': vendorId,
      'poNumber': poNumber,
      'issueDate': issueDate.toIso8601String(),
      'dueDate': dueDate?.toIso8601String(),
      'subtotal': subtotal,
      'taxTotal': taxTotal,
      'discountTotal': discountTotal,
      'totalAmount': totalAmount,
      'status': status,
      'notes': notes,
      'poDate': poDate?.toIso8601String(),
      'amountPaid': amountPaid,
      'nextPaymentDate': nextPaymentDate?.toIso8601String(),
      'vendorInvoiceUrl': vendorInvoiceUrl,
      'items': items.map((i) => i.toJson()).toList(),
    };
  }

  PurchaseOrder copyWith({
    int? id,
    int? userId,
    int? vendorId,
    String? poNumber,
    DateTime? issueDate,
    DateTime? dueDate,
    double? subtotal,
    double? taxTotal,
    double? discountTotal,
    double? totalAmount,
    String? status,
    String? notes,
    DateTime? poDate,
    double? amountPaid,
    DateTime? nextPaymentDate,
    String? vendorInvoiceUrl,
    List<PurchaseOrderItem>? items,
    Vendor? vendor,
  }) {
    return PurchaseOrder(
      id: id ?? this.id,
      userId: userId ?? this.userId,
      vendorId: vendorId ?? this.vendorId,
      poNumber: poNumber ?? this.poNumber,
      issueDate: issueDate ?? this.issueDate,
      dueDate: dueDate ?? this.dueDate,
      subtotal: subtotal ?? this.subtotal,
      taxTotal: taxTotal ?? this.taxTotal,
      discountTotal: discountTotal ?? this.discountTotal,
      totalAmount: totalAmount ?? this.totalAmount,
      status: status ?? this.status,
      notes: notes ?? this.notes,
      createdAt: createdAt,
      updatedAt: updatedAt,
      poDate: poDate ?? this.poDate,
      amountPaid: amountPaid ?? this.amountPaid,
      nextPaymentDate: nextPaymentDate ?? this.nextPaymentDate,
      vendorInvoiceUrl: vendorInvoiceUrl ?? this.vendorInvoiceUrl,
      items: items ?? this.items,
      vendor: vendor ?? this.vendor,
    );
  }
}