import 'package:pad_scanner/pages/boxing/boxing_models.dart';
import 'package:pad_scanner/services/api_service.dart';

int packedQuantity(List<CurrentZongpaiBoxData> items) {
  return items.fold<int>(0, (sum, item) => sum + item.quantity);
}

int remainingQuantity({
  required int? totalQuantity,
  required List<CurrentZongpaiBoxData> currentBoxes,
}) {
  return (totalQuantity ?? 0) - packedQuantity(currentBoxes);
}

bool quantityTooHigh({
  required int remainingQuantity,
  required String quantityText,
}) {
  if (remainingQuantity <= 0) return false;
  final quantity = int.tryParse(quantityText);
  return quantity != null && quantity > remainingQuantity;
}

bool canSubmitBoxing({
  required bool isSubmitting,
  required BoxingPhase phase,
  required String? zongpaiNo,
  required String boxNoText,
  required String quantityText,
  required int remainingQuantity,
  required bool quantityTooHigh,
  required bool isDuplicateBoxNo,
}) {
  if (isSubmitting || phase != BoxingPhase.scanned) return false;
  if (zongpaiNo == null) return false;
  final boxNo = int.tryParse(boxNoText);
  final quantity = int.tryParse(quantityText);
  if (boxNo == null || boxNo <= 0 || quantity == null || quantity <= 0) {
    return false;
  }
  if (remainingQuantity <= 0) return false;
  if (quantityTooHigh) return false;
  if (isDuplicateBoxNo) return false;
  return true;
}

int? currentManyToOneBoxNo(String boxNoText) {
  final boxNo = int.tryParse(boxNoText.trim());
  if (boxNo == null || boxNo <= 0) return null;
  return boxNo;
}

bool singleCodeBoxNoIsDuplicate({
  required String boxNoText,
  required List<CurrentZongpaiBoxData> currentBoxes,
  required int? editingBoxItemId,
}) {
  final boxNo = int.tryParse(boxNoText);
  if (boxNo == null) return false;
  return currentBoxes.any((box) {
    if (box.boxNo != boxNo) return false;
    return editingBoxItemId == null || box.boxItemId != editingBoxItemId;
  });
}

List<ManyToOnePackedItem> visibleManyToOnePackedItems({
  required int? boxNo,
  required List<BoxDetailData> existingBoxes,
  required List<ManyToOnePackedItem> packedItems,
  required String? paichanNo,
}) {
  if (boxNo == null) return const [];
  final byItemId = <int, ManyToOnePackedItem>{};
  for (final box in existingBoxes.where((box) => box.boxNo == boxNo)) {
    for (final item in box.items) {
      final boxItemId = item.boxItemId;
      if (boxItemId == null) continue;
      byItemId[boxItemId] = ManyToOnePackedItem(
        boxItemId: boxItemId,
        zongpaiNo: item.zongpaiNo,
        paichanNo: paichanNo,
        workOrderNo: item.workOrderNo,
        boxNo: boxNo,
        quantity: item.quantity,
        totalQuantity: item.totalQuantity,
      );
    }
  }
  for (final item in packedItems.where((item) => item.boxNo == boxNo)) {
    byItemId[item.boxItemId] = item;
  }
  return byItemId.values.toList(growable: false);
}

int maxAssignedQuantity({
  required int? totalQuantity,
  required int packedQuantity,
  required int itemQuantity,
}) {
  return (totalQuantity ?? 0) - (packedQuantity - itemQuantity);
}