import 'package:flutter/material.dart';
import 'package:pad_scanner/services/api_service.dart';

class RegistrationOverviewStats {
  final int totalCount;
  final int shelvedCount;
  final int transferredCount;

  const RegistrationOverviewStats({
    required this.totalCount,
    required this.shelvedCount,
    required this.transferredCount,
  });
}

class RegistrationOverviewSections {
  final List<PaichaOverviewItem> scanned;
  final List<PaichaOverviewItem> unscanned;

  const RegistrationOverviewSections({
    required this.scanned,
    required this.unscanned,
  });

  bool get hasDivider => scanned.isNotEmpty && unscanned.isNotEmpty;
}

RegistrationOverviewStats overviewStats(PaichaOverviewResult? overview) {
  if (overview?.success != true) {
    return const RegistrationOverviewStats(
      totalCount: 0,
      shelvedCount: 0,
      transferredCount: 0,
    );
  }

  var shelvedCount = 0;
  var transferredCount = 0;
  for (final item in overview!.items) {
    switch (item.status) {
      case 'on_shelf':
        shelvedCount++;
      case 'transferred':
        transferredCount++;
    }
  }

  return RegistrationOverviewStats(
    totalCount: overview.totalCount,
    shelvedCount: shelvedCount,
    transferredCount: transferredCount,
  );
}

RegistrationOverviewSections splitOverviewItems({
  required PaichaOverviewResult overview,
  required Iterable<String> zongpaiNos,
}) {
  final scannedSet = zongpaiNos.toSet();
  final scanned = <PaichaOverviewItem>[];
  final unscanned = <PaichaOverviewItem>[];
  for (final item in overview.items) {
    if (scannedSet.contains(item.zongpaiNo)) {
      scanned.add(item);
    } else {
      unscanned.add(item);
    }
  }
  return RegistrationOverviewSections(scanned: scanned, unscanned: unscanned);
}

List<PaichaOverviewItem> findOnShelfItemsInScanned({
  required PaichaOverviewResult? overview,
  required Iterable<String> zongpaiNos,
}) {
  return _findScannedItemsByStatus(
    overview: overview,
    zongpaiNos: zongpaiNos,
    status: 'on_shelf',
  );
}

List<PaichaOverviewItem> findTransferredItemsInScanned({
  required PaichaOverviewResult? overview,
  required Iterable<String> zongpaiNos,
}) {
  return _findScannedItemsByStatus(
    overview: overview,
    zongpaiNos: zongpaiNos,
    status: 'transferred',
  );
}

bool hasAnyLocatedInScanned({
  required PaichaOverviewResult? overview,
  required Iterable<String> zongpaiNos,
}) {
  if (overview?.success != true) return false;
  final scannedSet = zongpaiNos.toSet();
  return overview!.items.any(
    (item) =>
        scannedSet.contains(item.zongpaiNo) &&
        (item.status == 'on_shelf' || item.status == 'transferred'),
  );
}

Color registrationBarColor({
  required String status,
  required bool isScanned,
  required bool isTransitTarget,
}) {
  if (isScanned) {
    return status == 'on_shelf' && !isTransitTarget
        ? Colors.red
        : const Color(0xFF43A047);
  }

  switch (status) {
    case 'on_shelf':
      return const Color(0xFF2196F3);
    case 'transferred':
      return const Color(0xFFFF9800);
    default:
      return Colors.grey.shade400;
  }
}

Color registrationRowBgColor({
  required String status,
  required bool isScanned,
  required bool isTransitTarget,
}) {
  if (isScanned) {
    return status == 'on_shelf' && !isTransitTarget
        ? Colors.red.shade50
        : const Color(0xFFF1F8E9);
  }

  switch (status) {
    case 'on_shelf':
      return const Color(0xFFE3F2FD);
    case 'transferred':
      return const Color(0xFFFFF3E0);
    default:
      return const Color(0xFFF5F5F5);
  }
}

List<PaichaOverviewItem> _findScannedItemsByStatus({
  required PaichaOverviewResult? overview,
  required Iterable<String> zongpaiNos,
  required String status,
}) {
  if (overview?.success != true) return [];
  final scannedSet = zongpaiNos.toSet();
  return overview!.items
      .where(
        (item) => scannedSet.contains(item.zongpaiNo) && item.status == status,
      )
      .toList();
}