bharat_erp/lib/shared/models/purchase_order_model.dart

import 'package:freezed_annotation/freezed_annotation.dart';

part 'purchase_order_model.freezed.dart';
part 'purchase_order_model.g.dart';

String _idFromJson(Object? value) => value?.toString() ?? '';

int? _intFromJsonNullable(Object? value) {
  if (value == null) return null;
  if (value is int) return value;
  if (value is num) return value.toInt();
  return int.tryParse(value.toString());
}

double? _doubleFromJsonNullable(Object? value) {
  if (value == null) return null;
  if (value is double) return value;
  if (value is num) return value.toDouble();
  return double.tryParse(value.toString());
}

DateTime? _dateFromJsonNullable(Object? value) {
  if (value == null) return null;
  if (value is DateTime) return value;
  return DateTime.tryParse(value.toString());
}

Object? _readNestedName(Map<dynamic, dynamic> json, String flatKey, String nestedKey) {
  final flat = json[flatKey];
  if (flat is String && flat.isNotEmpty) return flat;
  final nested = json[nestedKey];
  if (nested is Map) {
    return nested['name'] ?? nested['vendor_name'];
  }
  return null;
}

Object? _readVendorName(Map<dynamic, dynamic> json, String key) =>
    _readNestedName(json, 'vendor_name', 'vendor');

Object? _readPlantName(Map<dynamic, dynamic> json, String key) =>
    _readNestedName(json, 'plant_name', 'plant');

Object? _readWarehouseName(Map<dynamic, dynamic> json, String key) =>
    _readNestedName(json, 'warehouse_name', 'warehouse');

Object? _readItemName(Map<dynamic, dynamic> json, String key) {
  final flat = json['item_name'];
  if (flat is String && flat.isNotEmpty) return flat;
  final nested = json['item'];
  if (nested is Map) return nested['name'];
  return null;
}

Object? _readItemCode(Map<dynamic, dynamic> json, String key) {
  final flat = json['item_code'];
  if (flat is String && flat.isNotEmpty) return flat;
  final nested = json['item'];
  if (nested is Map) return nested['code'];
  return null;
}

Object? _readUomName(Map<dynamic, dynamic> json, String key) {
  final flat = json['uom_name'];
  if (flat is String && flat.isNotEmpty) return flat;
  final nested = json['uom'];
  if (nested is Map) return nested['name'];
  return null;
}

Object? _readPoNumber(Map<dynamic, dynamic> json, String key) {
  final poNumber = json['po_number'];
  if (poNumber != null && poNumber.toString().trim().isNotEmpty) {
    return poNumber.toString();
  }
  final poNo = json['po_no'];
  if (poNo != null && poNo.toString().trim().isNotEmpty) {
    return poNo.toString();
  }
  return null;
}

Object? _readGrandTotal(Map<dynamic, dynamic> json, String key) =>
    _doubleFromJsonNullable(json['grand_total'] ?? json['total_amount']);

Object? _readTaxTotal(Map<dynamic, dynamic> json, String key) =>
    _doubleFromJsonNullable(json['tax_total'] ?? json['tax_amount']);

Object? _readSubTotal(Map<dynamic, dynamic> json, String key) =>
    _doubleFromJsonNullable(json['sub_total'] ?? json['taxable_amount']);

@freezed
class PurchaseOrderModel with _$PurchaseOrderModel {
  const PurchaseOrderModel._();

  const factory PurchaseOrderModel({
    @JsonKey(fromJson: _idFromJson) required String id,
    @JsonKey(name: 'po_number', readValue: _readPoNumber) String? poNo,
    @JsonKey(name: 'po_date', fromJson: _dateFromJsonNullable) DateTime? poDate,
    @JsonKey(name: 'po_type') String? poType,
    @Default('DRAFT') String status,
    @JsonKey(name: 'vendor_id', fromJson: _intFromJsonNullable) int? vendorId,
    @JsonKey(name: 'vendor_name', readValue: _readVendorName) String? vendorName,
    @JsonKey(name: 'plant_id', fromJson: _intFromJsonNullable) int? plantId,
    @JsonKey(name: 'plant_name', readValue: _readPlantName) String? plantName,
    @JsonKey(name: 'warehouse_id', fromJson: _intFromJsonNullable) int? warehouseId,
    @JsonKey(name: 'warehouse_name', readValue: _readWarehouseName) String? warehouseName,
    @JsonKey(name: 'brand_id', fromJson: _intFromJsonNullable) int? brandId,
    @JsonKey(name: 'payment_term_id', fromJson: _intFromJsonNullable) int? paymentTermId,
    @JsonKey(name: 'delivery_term_id', fromJson: _intFromJsonNullable) int? deliveryTermId,
    @JsonKey(name: 'expected_delivery_date', fromJson: _dateFromJsonNullable)
    DateTime? expectedDeliveryDate,
    @JsonKey(name: 'discount_amount', fromJson: _doubleFromJsonNullable)
    double? discountAmount,
    @JsonKey(name: 'freight_charges', fromJson: _doubleFromJsonNullable)
    double? freightCharges,
    @JsonKey(name: 'other_charges', fromJson: _doubleFromJsonNullable)
    double? otherCharges,
    @JsonKey(name: 'sub_total', readValue: _readSubTotal)
    double? taxableAmount,
    @JsonKey(name: 'tax_total', readValue: _readTaxTotal)
    double? taxAmount,
    @JsonKey(name: 'grand_total', readValue: _readGrandTotal)
    double? totalAmount,
    @JsonKey(name: 'terms_and_conditions') String? termsAndConditions,
    String? remarks,
    @JsonKey(name: 'revision_no', fromJson: _intFromJsonNullable) int? revisionNo,
    @JsonKey(name: 'created_at', fromJson: _dateFromJsonNullable) DateTime? createdAt,
    @JsonKey(name: 'updated_at', fromJson: _dateFromJsonNullable) DateTime? updatedAt,
    @Default([]) List<PurchaseOrderItemModel> items,
  }) = _PurchaseOrderModel;

  factory PurchaseOrderModel.fromJson(Map<String, dynamic> json) =>
      _$PurchaseOrderModelFromJson(json);

  bool get canEdit =>
      status.toUpperCase() == 'DRAFT' || status.toUpperCase() == 'REJECTED';

  bool get canDelete => canEdit;

  bool get canSubmit => status.toUpperCase() == 'DRAFT';

  bool get canApprove {
    final s = status.toUpperCase();
    return s == 'SUBMITTED' || s == 'PENDING_APPROVAL' || s == 'PENDING';
  }

  bool get canReject => canApprove;

  bool get canAmend => status.toUpperCase() == 'APPROVED';

  bool get canCancel {
    final s = status.toUpperCase();
    return s != 'CANCELLED' && s != 'DRAFT';
  }
}

@freezed
class PurchaseOrderItemModel with _$PurchaseOrderItemModel {
  const factory PurchaseOrderItemModel({
    @JsonKey(fromJson: _idFromJson) required String id,
    @JsonKey(name: 'po_id', fromJson: _idFromJson) String? poId,
    @JsonKey(name: 'item_id', fromJson: _intFromJsonNullable) int? itemId,
    @JsonKey(name: 'item_code', readValue: _readItemCode) String? itemCode,
    @JsonKey(name: 'item_name', readValue: _readItemName) String? itemName,
    @JsonKey(name: 'line_no', fromJson: _intFromJsonNullable) int? lineNo,
    @JsonKey(name: 'ordered_qty', fromJson: _doubleFromJsonNullable)
    double? orderedQty,
    @JsonKey(name: 'received_qty', fromJson: _doubleFromJsonNullable)
    double? receivedQty,
    @JsonKey(name: 'uom_id', fromJson: _intFromJsonNullable) int? uomId,
    @JsonKey(name: 'uom_name', readValue: _readUomName) String? uomName,
    @JsonKey(fromJson: _doubleFromJsonNullable) double? rate,
    @JsonKey(name: 'discount_pct', fromJson: _doubleFromJsonNullable)
    double? discountPct,
    @JsonKey(name: 'discount_amount', fromJson: _doubleFromJsonNullable)
    double? discountAmount,
    @JsonKey(name: 'gst_rate_id', fromJson: _intFromJsonNullable) int? gstRateId,
    @JsonKey(name: 'hsn_code_id', fromJson: _intFromJsonNullable) int? hsnCodeId,
    @JsonKey(name: 'line_amount', fromJson: _doubleFromJsonNullable)
    double? lineAmount,
    String? remarks,
  }) = _PurchaseOrderItemModel;

  factory PurchaseOrderItemModel.fromJson(Map<String, dynamic> json) =>
      _$PurchaseOrderItemModelFromJson(json);
}

@freezed
class PurchaseOrderListQuery with _$PurchaseOrderListQuery {
  const factory PurchaseOrderListQuery({
    @Default(1) int page,
    @Default(20) int limit,
    String? search,
    String? status,
    String? poType,
    int? vendorId,
    int? plantId,
    String? dateFrom,
    String? dateTo,
  }) = _PurchaseOrderListQuery;
}

const poTypeOptions = [
  ('RAW_MATERIAL', 'Raw Material'),
  ('PACKING_MATERIAL', 'Packing Material'),
  ('ASSET_CAPITAL', 'Asset / Capital'),
  ('SERVICE', 'Service'),
  ('GENERAL', 'General'),
];

const poStatusOptions = [
  ('DRAFT', 'Draft'),
  ('SUBMITTED', 'Submitted'),
  ('PENDING_APPROVAL', 'Pending Approval'),
  ('APPROVED', 'Approved'),
  ('REJECTED', 'Rejected'),
  ('CANCELLED', 'Cancelled'),
  ('PARTIALLY_RECEIVED', 'Partially Received'),
  ('FULLY_RECEIVED', 'Fully Received'),
];

String poTypeLabel(String? value) {
  if (value == null) return '—';
  return poTypeOptions
          .where((e) => e.$1 == value)
          .map((e) => e.$2)
          .firstOrNull ??
      value;
}

String poStatusLabel(String? value) {
  if (value == null) return '—';
  return poStatusOptions
          .where((e) => e.$1 == value)
          .map((e) => e.$2)
          .firstOrNull ??
      value.replaceAll('_', ' ');
}