class CreditNoteItem {
  final int? id;
  final int? creditNoteId;
  final int? invoiceItemId;
  final int? productId;
  final int? inventoryItemId;
  final String? productName;
  final String? sku;
  final String? huid;
  final String? hsnCode;
  final double quantity;
  final double? weight;
  final double unitPrice;
  final double taxRate;
  final double cgst;
  final double sgst;
  final double igst;
  final double discount;
  final double makingCharge;
  final double otherCharges;
  final double total;

  CreditNoteItem({
    this.id,
    this.creditNoteId,
    this.invoiceItemId,
    this.productId,
    this.inventoryItemId,
    this.productName,
    this.sku,
    this.huid,
    this.hsnCode,
    required this.quantity,
    this.weight,
    required this.unitPrice,
    this.taxRate = 0.0,
    this.cgst = 0.0,
    this.sgst = 0.0,
    this.igst = 0.0,
    this.discount = 0.0,
    this.makingCharge = 0.0,
    this.otherCharges = 0.0,
    required this.total,
  });

  factory CreditNoteItem.fromJson(Map<String, dynamic> json) {
    return CreditNoteItem(
      id: json['id'],
      creditNoteId: json['creditNoteId'] ?? json['credit_note_id'],
      invoiceItemId: json['invoiceItemId'] ?? json['invoice_item_id'],
      productId: json['productId'] ?? json['product_id'],
      inventoryItemId: json['inventoryItemId'] ?? json['inventory_item_id'],
      productName: json['productName'] ?? json['product_name'],
      sku: json['sku'],
      huid: json['huid'],
      hsnCode: json['hsnCode'] ?? json['hsn_code'],
      quantity: (json['quantity'] as num?)?.toDouble() ?? 1.0,
      weight: (json['weight'] as num?)?.toDouble(),
      unitPrice: (json['unitPrice'] ?? json['unit_price'] as num?)?.toDouble() ?? 0.0,
      taxRate: (json['taxRate'] ?? json['tax_rate'] as num?)?.toDouble() ?? 0.0,
      cgst: (json['cgst'] as num?)?.toDouble() ?? 0.0,
      sgst: (json['sgst'] as num?)?.toDouble() ?? 0.0,
      igst: (json['igst'] as num?)?.toDouble() ?? 0.0,
      discount: (json['discount'] as num?)?.toDouble() ?? 0.0,
      makingCharge: (json['makingCharge'] ?? json['making_charge'] as num?)?.toDouble() ?? 0.0,
      otherCharges: (json['otherCharges'] ?? json['other_charges'] as num?)?.toDouble() ?? 0.0,
      total: (json['total'] as num?)?.toDouble() ?? 0.0,
    );
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = {};
    if (id != null) data['id'] = id;
    if (creditNoteId != null) data['creditNoteId'] = creditNoteId;
    if (invoiceItemId != null) data['invoiceItemId'] = invoiceItemId;
    if (productId != null) data['productId'] = productId;
    if (inventoryItemId != null) data['inventoryItemId'] = inventoryItemId;
    if (productName != null) data['productName'] = productName;
    if (sku != null) data['sku'] = sku;
    if (huid != null) data['huid'] = huid;
    if (hsnCode != null) data['hsnCode'] = hsnCode;
    data['quantity'] = quantity;
    if (weight != null) data['weight'] = weight;
    data['unitPrice'] = unitPrice;
    data['taxRate'] = taxRate;
    data['cgst'] = cgst;
    data['sgst'] = sgst;
    data['igst'] = igst;
    data['discount'] = discount;
    data['makingCharge'] = makingCharge;
    data['otherCharges'] = otherCharges;
    data['total'] = total;
    return data;
  }
}

class CreditNote {
  final int? id;
  final int? userId;
  final int invoiceId;
  final String creditNoteNumber;
  final int? customerId;
  final DateTime returnDate;
  final String reason; // CUSTOMER_RETURN, RTO_UNDELIVERED, DEFECTIVE, EXCHANGE, OTHER
  final bool restockItems;
  final double subtotal;
  final double taxTotal;
  final double cgstTotal;
  final double sgstTotal;
  final double igstTotal;
  final double discountTotal;
  final double totalAmount;
  final String refundStatus; // ADJUSTED_TO_AR, REFUNDED_TO_WALLET, STORE_CREDIT, PENDING
  final int? refundWalletId;
  final String? notes;
  final DateTime? createdAt;
  final DateTime? updatedAt;
  final List<CreditNoteItem> items;

  CreditNote({
    this.id,
    this.userId,
    required this.invoiceId,
    required this.creditNoteNumber,
    this.customerId,
    required this.returnDate,
    this.reason = 'CUSTOMER_RETURN',
    this.restockItems = true,
    required this.subtotal,
    this.taxTotal = 0.0,
    this.cgstTotal = 0.0,
    this.sgstTotal = 0.0,
    this.igstTotal = 0.0,
    this.discountTotal = 0.0,
    required this.totalAmount,
    this.refundStatus = 'ADJUSTED_TO_AR',
    this.refundWalletId,
    this.notes,
    this.createdAt,
    this.updatedAt,
    this.items = const [],
  });

  factory CreditNote.fromJson(Map<String, dynamic> json) {
    return CreditNote(
      id: json['id'],
      userId: json['userId'] ?? json['user_id'],
      invoiceId: json['invoiceId'] ?? json['invoice_id'] ?? 0,
      creditNoteNumber: json['creditNoteNumber'] ?? json['credit_note_number'] ?? '',
      customerId: json['customerId'] ?? json['customer_id'],
      returnDate: json['returnDate'] != null
          ? DateTime.parse(json['returnDate'])
          : (json['return_date'] != null ? DateTime.parse(json['return_date']) : DateTime.now()),
      reason: json['reason'] ?? 'CUSTOMER_RETURN',
      restockItems: json['restockItems'] ?? json['restock_items'] ?? true,
      subtotal: (json['subtotal'] as num?)?.toDouble() ?? 0.0,
      taxTotal: (json['taxTotal'] ?? json['tax_total'] as num?)?.toDouble() ?? 0.0,
      cgstTotal: (json['cgstTotal'] ?? json['cgst_total'] as num?)?.toDouble() ?? 0.0,
      sgstTotal: (json['sgstTotal'] ?? json['sgst_total'] as num?)?.toDouble() ?? 0.0,
      igstTotal: (json['igstTotal'] ?? json['igst_total'] as num?)?.toDouble() ?? 0.0,
      discountTotal: (json['discountTotal'] ?? json['discount_total'] as num?)?.toDouble() ?? 0.0,
      totalAmount: (json['totalAmount'] ?? json['total_amount'] as num?)?.toDouble() ?? 0.0,
      refundStatus: json['refundStatus'] ?? json['refund_status'] ?? 'ADJUSTED_TO_AR',
      refundWalletId: json['refundWalletId'] ?? json['refund_wallet_id'],
      notes: json['notes'],
      createdAt: json['createdAt'] != null
          ? DateTime.parse(json['createdAt'])
          : (json['created_at'] != null ? DateTime.parse(json['created_at']) : null),
      updatedAt: json['updatedAt'] != null
          ? DateTime.parse(json['updatedAt'])
          : (json['updated_at'] != null ? DateTime.parse(json['updated_at']) : null),
      items: json['items'] != null
          ? (json['items'] as List).map((i) => CreditNoteItem.fromJson(i)).toList()
          : [],
    );
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = {};
    if (id != null) data['id'] = id;
    if (userId != null) data['userId'] = userId;
    data['invoiceId'] = invoiceId;
    data['creditNoteNumber'] = creditNoteNumber;
    if (customerId != null) data['customerId'] = customerId;
    data['returnDate'] = returnDate.toIso8601String().split('T')[0];
    data['reason'] = reason;
    data['restockItems'] = restockItems;
    data['subtotal'] = subtotal;
    data['taxTotal'] = taxTotal;
    data['cgstTotal'] = cgstTotal;
    data['sgstTotal'] = sgstTotal;
    data['igstTotal'] = igstTotal;
    data['discountTotal'] = discountTotal;
    data['totalAmount'] = totalAmount;
    data['refundStatus'] = refundStatus;
    if (refundWalletId != null) data['refundWalletId'] = refundWalletId;
    if (notes != null) data['notes'] = notes;
    data['items'] = items.map((i) => i.toJson()).toList();
    return data;
  }
}