class StockInItem {
  final int? id;
  final int? orderId;
  final int productId;
  final double quantity;
  final double costPrice; // 进价（单瓶）
  final double costAmount; // 总进价 = quantity × costPrice
  final double returnedQuantity; // 0=未退；>=quantity 表示整行已退单
  final String? batchNo;
  final String? productionDate;

  /// 该明细是否已退单（整行已退）。
  bool get isReturned => returnedQuantity >= quantity && quantity > 0;
  // Denormalized for display
  final String? productName;
  final String? productCode;
  final String? productSeries;
  final String? productSpec;
  final String? productUnit;
  final String? productOrigin;
  final String? productShelfLife;
  final String? productStorage;

  const StockInItem({
    this.id,
    this.orderId,
    required this.productId,
    required this.quantity,
    required this.costPrice,
    required this.costAmount,
    this.returnedQuantity = 0,
    this.batchNo,
    this.productionDate,
    this.productName,
    this.productCode,
    this.productSeries,
    this.productSpec,
    this.productUnit,
    this.productOrigin,
    this.productShelfLife,
    this.productStorage,
  });

  factory StockInItem.fromJson(Map<String, dynamic> json) {
    final product = json['product'] as Map<String, dynamic>?;
    // 历史导入行 product_id=0、无 product 关联，商品信息存在明细行自身列上。
    // 优先取明细行快照列，回退到 product 关联（App 新建单据走 product）。
    String? lineOrProduct(String lineKey, String productKey) {
      final line = json[lineKey] as String?;
      if (line != null && line.isNotEmpty) return line;
      return product?[productKey] as String?;
    }

    return StockInItem(
      id: json['id'] != null ? (json['id'] as num).toInt() : null,
      orderId:
          json['order_id'] != null ? (json['order_id'] as num).toInt() : null,
      productId: (json['product_id'] as num).toInt(),
      quantity: (json['quantity'] as num).toDouble(),
      costPrice: (json['cost_price'] as num?)?.toDouble() ?? 0,
      costAmount: (json['cost_amount'] as num?)?.toDouble() ?? 0,
      returnedQuantity: (json['returned_quantity'] as num?)?.toDouble() ?? 0,
      batchNo: json['batch_no'] as String?,
      productionDate: json['production_date'] as String?,
      productName: lineOrProduct('product_name', 'name'),
      productCode: lineOrProduct('product_code', 'code'),
      productSeries: lineOrProduct('series', 'series'),
      productSpec: lineOrProduct('spec', 'spec'),
      productUnit:
          (json['product'] as Map<String, dynamic>?)?['unit'] as String?,
      productOrigin: ((json['product'] as Map<String, dynamic>?)?['origin']
          as Map<String, dynamic>?)?['name'] as String?,
      productShelfLife:
          ((json['product'] as Map<String, dynamic>?)?['shelf_life']
              as Map<String, dynamic>?)?['name'] as String?,
      productStorage: ((json['product'] as Map<String, dynamic>?)?['storage']
          as Map<String, dynamic>?)?['name'] as String?,
    );
  }

  Map<String, dynamic> toJson() => {
        'product_id': productId,
        'quantity': quantity,
        'cost_price': costPrice,
        'cost_amount': costAmount,
        if (batchNo != null) 'batch_no': batchNo,
        if (productionDate != null) 'production_date': productionDate,
      };
}

class StockInOrder {
  final int id;
  final String orderNo;
  final String? type;
  final int warehouseId;
  final String? warehouseName;
  final int? partnerId;
  final String? partnerName;
  final int? operatorId;
  final String? operatorName;
  final int? reviewerId;
  final String? reviewerName;
  final String status; // draft | pending | approved | rejected
  final String returnState; // none | partial | full（退单状态）
  final String? orderDate;
  final String? reviewedAt;
  final double? costTotal; // 应付合计 = Σ 总进价
  final String? remark;
  final List<StockInItem> items;

  const StockInOrder({
    required this.id,
    required this.orderNo,
    this.type,
    required this.warehouseId,
    this.warehouseName,
    this.partnerId,
    this.partnerName,
    this.operatorId,
    this.operatorName,
    this.reviewerId,
    this.reviewerName,
    required this.status,
    this.returnState = 'none',
    this.orderDate,
    this.reviewedAt,
    this.costTotal,
    this.remark,
    this.items = const [],
  });

  factory StockInOrder.fromJson(Map<String, dynamic> json) => StockInOrder(
        id: (json['id'] as num).toInt(),
        orderNo: json['order_no'] as String,
        type: json['type'] as String?,
        warehouseId: (json['warehouse_id'] as num).toInt(),
        warehouseName:
            (json['warehouse'] as Map<String, dynamic>?)?['name'] as String?,
        partnerId: json['partner_id'] != null
            ? (json['partner_id'] as num).toInt()
            : null,
        partnerName:
            (json['partner'] as Map<String, dynamic>?)?['name'] as String?,
        operatorId: json['operator_id'] != null
            ? (json['operator_id'] as num).toInt()
            : null,
        operatorName: (json['operator'] as Map<String, dynamic>?)?['real_name']
            as String?,
        reviewerId: json['reviewer_id'] != null
            ? (json['reviewer_id'] as num).toInt()
            : null,
        reviewerName: (json['reviewer'] as Map<String, dynamic>?)?['real_name']
            as String?,
        status: json['status'] as String,
        returnState: json['return_state'] as String? ?? 'none',
        orderDate: json['order_date'] as String?,
        reviewedAt: json['reviewed_at'] as String?,
        costTotal: json['cost_total'] != null
            ? (json['cost_total'] as num).toDouble()
            : null,
        remark: json['remark'] as String?,
        items: json['items'] != null
            ? (json['items'] as List)
                .map((e) => StockInItem.fromJson(e as Map<String, dynamic>))
                .toList()
            : [],
      );
}