/// 巡检管理相关 API 调用服务
/// 当前使用 mock 数据，后端 API 就绪后替换为真实请求
class PatrolService {
  PatrolService._internal();
  static final PatrolService instance = PatrolService._internal();
  factory PatrolService() => instance;

  // ==================== Mock 数据 ====================

  /// 获取巡检任务列表
  Future<List<PatrolTask>> getTaskList({PatrolTaskStatus? status}) async {
    await Future.delayed(const Duration(milliseconds: 800));
    final tasks = [
      PatrolTask(
        id: 'XJ-2024-001',
        routeName: '城东片区巡检路线',
        date: DateTime(2024, 6, 14),
        totalPoints: 8,
        completedPoints: 0,
        priority: PatrolPriority.high,
        status: PatrolTaskStatus.pending,
        assignee: '张建国',
        description: '城东片区主干管网及加压站设备巡检，包含8个巡检点',
        points: _mockPointsEast,
      ),
      PatrolTask(
        id: 'XJ-2024-002',
        routeName: '城北加压站巡检',
        date: DateTime(2024, 6, 14),
        totalPoints: 4,
        completedPoints: 0,
        priority: PatrolPriority.medium,
        status: PatrolTaskStatus.pending,
        assignee: '李明',
        description: '城北加压站设备日检，包含泵站、配电柜、压力表等设备',
        points: _mockPointsNorth,
      ),
      PatrolTask(
        id: 'XJ-2024-003',
        routeName: '水厂设备日检',
        date: DateTime(2024, 6, 15),
        totalPoints: 12,
        completedPoints: 0,
        priority: PatrolPriority.high,
        status: PatrolTaskStatus.pending,
        assignee: '王芳',
        description: '水厂全部设备日检，包含取水泵房、净水设备、加药间、消毒间等',
        points: _mockPointsFactory,
      ),
      PatrolTask(
        id: 'XJ-2024-004',
        routeName: '城西管网巡检',
        date: DateTime(2024, 6, 14),
        totalPoints: 6,
        completedPoints: 3,
        priority: PatrolPriority.medium,
        status: PatrolTaskStatus.ongoing,
        assignee: '赵强',
        description: '城西片区管网巡检，重点检查阀门井和消防栓',
        points: _mockPointsWest,
      ),
      PatrolTask(
        id: 'XJ-2024-005',
        routeName: '城南片区周检',
        date: DateTime(2024, 6, 13),
        totalPoints: 10,
        completedPoints: 10,
        priority: PatrolPriority.low,
        status: PatrolTaskStatus.completed,
        assignee: '刘伟',
        description: '城南片区管网周检',
        points: _mockPointsSouth,
        result: PatrolResult.normal,
        reportTime: DateTime(2024, 6, 13, 16, 30),
      ),
      PatrolTask(
        id: 'XJ-2024-006',
        routeName: '水厂设备周检',
        date: DateTime(2024, 6, 13),
        totalPoints: 12,
        completedPoints: 12,
        priority: PatrolPriority.high,
        status: PatrolTaskStatus.completed,
        assignee: '张建国',
        description: '水厂全部设备周检',
        points: _mockPointsFactory,
        result: PatrolResult.issueFound,
        reportTime: DateTime(2024, 6, 13, 15, 0),
        issues: '2号加药泵存在异响，已记录待维修',
      ),
    ];
    if (status != null) {
      return tasks.where((t) => t.status == status).toList();
    }
    return tasks;
  }

  /// 获取任务详情
  Future<PatrolTask?> getTaskDetail(String taskId) async {
    await Future.delayed(const Duration(milliseconds: 500));
    final tasks = await getTaskList();
    try {
      return tasks.firstWhere((t) => t.id == taskId);
    } catch (_) {
      return null;
    }
  }

  /// 开始巡检任务
  Future<bool> startTask(String taskId) async {
    await Future.delayed(const Duration(milliseconds: 600));
    return true;
  }

  /// 提交巡检点上报
  Future<bool> submitPointReport({
    required String taskId,
    required String pointId,
    required PatrolPointStatus status,
    String? remark,
    List<String>? photoPaths,
  }) async {
    await Future.delayed(const Duration(milliseconds: 700));
    return true;
  }

  /// 完成巡检任务
  Future<bool> completeTask({
    required String taskId,
    required PatrolResult result,
    String? summary,
  }) async {
    await Future.delayed(const Duration(milliseconds: 800));
    return true;
  }

  /// 获取GPS轨迹点列表
  Future<List<TrackPoint>> getTrackPoints(String taskId) async {
    await Future.delayed(const Duration(milliseconds: 500));
    return [
      TrackPoint(
        id: 'TP001',
        lat: 30.2741,
        lng: 120.1551,
        altitude: 15.2,
        speed: 0,
        timestamp: DateTime(2024, 6, 14, 8, 0),
        address: '水厂大门',
      ),
      TrackPoint(
        id: 'TP002',
        lat: 30.2748,
        lng: 120.1562,
        altitude: 14.8,
        speed: 3.2,
        timestamp: DateTime(2024, 6, 14, 8, 5),
        address: '城东路段阀门井',
      ),
      TrackPoint(
        id: 'TP003',
        lat: 30.2755,
        lng: 120.1578,
        altitude: 15.0,
        speed: 2.8,
        timestamp: DateTime(2024, 6, 14, 8, 12),
        address: '阳光小区加压站',
      ),
      TrackPoint(
        id: 'TP004',
        lat: 30.2763,
        lng: 120.1590,
        altitude: 14.5,
        speed: 0,
        timestamp: DateTime(2024, 6, 14, 8, 20),
        address: '城东消防栓-03',
      ),
      TrackPoint(
        id: 'TP005',
        lat: 30.2770,
        lng: 120.1605,
        altitude: 15.3,
        speed: 4.1,
        timestamp: DateTime(2024, 6, 14, 8, 28),
        address: '东方名城阀门井',
      ),
      TrackPoint(
        id: 'TP006',
        lat: 30.2778,
        lng: 120.1618,
        altitude: 14.9,
        speed: 0,
        timestamp: DateTime(2024, 6, 14, 8, 35),
        address: '城东片区末端压力表',
      ),
    ];
  }

  // ==================== Mock 巡检点数据 ====================

  static final List<PatrolPoint> _mockPointsEast = [
    PatrolPoint(id: 'PP001', name: '城东路段阀门井', type: PatrolPointType.valve, lat: 30.2748, lng: 120.1562, order: 1),
    PatrolPoint(id: 'PP002', name: '阳光小区加压站', type: PatrolPointType.pumpStation, lat: 30.2755, lng: 120.1578, order: 2),
    PatrolPoint(id: 'PP003', name: '城东消防栓-03', type: PatrolPointType.hydrant, lat: 30.2763, lng: 120.1590, order: 3),
    PatrolPoint(id: 'PP004', name: '东方名城阀门井', type: PatrolPointType.valve, lat: 30.2770, lng: 120.1605, order: 4),
    PatrolPoint(id: 'PP005', name: '城东片区末端压力表', type: PatrolPointType.meter, lat: 30.2778, lng: 120.1618, order: 5),
    PatrolPoint(id: 'PP006', name: '锦绣家园管网接口', type: PatrolPointType.junction, lat: 30.2785, lng: 120.1630, order: 6),
    PatrolPoint(id: 'PP007', name: '翠湖路排气阀', type: PatrolPointType.valve, lat: 30.2792, lng: 120.1645, order: 7),
    PatrolPoint(id: 'PP008', name: '城东片区测流点', type: PatrolPointType.meter, lat: 30.2800, lng: 120.1660, order: 8),
  ];

  static final List<PatrolPoint> _mockPointsNorth = [
    PatrolPoint(id: 'PP009', name: '城北加压站1号泵', type: PatrolPointType.pumpStation, lat: 30.2900, lng: 120.1500, order: 1),
    PatrolPoint(id: 'PP010', name: '城北加压站配电柜', type: PatrolPointType.electrical, lat: 30.2902, lng: 120.1505, order: 2),
    PatrolPoint(id: 'PP011', name: '城北加压站出水压力表', type: PatrolPointType.meter, lat: 30.2905, lng: 120.1510, order: 3),
    PatrolPoint(id: 'PP012', name: '城北加压站流量计', type: PatrolPointType.meter, lat: 30.2908, lng: 120.1515, order: 4),
  ];

  static final List<PatrolPoint> _mockPointsFactory = [
    PatrolPoint(id: 'PP013', name: '取水泵房', type: PatrolPointType.pumpStation, lat: 30.2700, lng: 120.1400, order: 1),
    PatrolPoint(id: 'PP014', name: '混合池', type: PatrolPointType.equipment, lat: 30.2705, lng: 120.1410, order: 2),
    PatrolPoint(id: 'PP015', name: '絮凝池', type: PatrolPointType.equipment, lat: 30.2710, lng: 120.1420, order: 3),
    PatrolPoint(id: 'PP016', name: '沉淀池', type: PatrolPointType.equipment, lat: 30.2715, lng: 120.1430, order: 4),
    PatrolPoint(id: 'PP017', name: '滤池-1号', type: PatrolPointType.equipment, lat: 30.2720, lng: 120.1440, order: 5),
    PatrolPoint(id: 'PP018', name: '滤池-2号', type: PatrolPointType.equipment, lat: 30.2722, lng: 120.1445, order: 6),
    PatrolPoint(id: 'PP019', name: '清水池', type: PatrolPointType.reservoir, lat: 30.2725, lng: 120.1450, order: 7),
    PatrolPoint(id: 'PP020', name: '加药间', type: PatrolPointType.equipment, lat: 30.2728, lng: 120.1455, order: 8),
    PatrolPoint(id: 'PP021', name: '消毒间', type: PatrolPointType.equipment, lat: 30.2730, lng: 120.1460, order: 9),
    PatrolPoint(id: 'PP022', name: '送水泵房', type: PatrolPointType.pumpStation, lat: 30.2733, lng: 120.1465, order: 10),
    PatrolPoint(id: 'PP023', name: '出厂水水质仪', type: PatrolPointType.meter, lat: 30.2735, lng: 120.1470, order: 11),
    PatrolPoint(id: 'PP024', name: '出水流量计', type: PatrolPointType.meter, lat: 30.2738, lng: 120.1475, order: 12),
  ];

  static final List<PatrolPoint> _mockPointsWest = [
    PatrolPoint(id: 'PP025', name: '城西阀门井-01', type: PatrolPointType.valve, lat: 30.2750, lng: 120.1450, order: 1),
    PatrolPoint(id: 'PP026', name: '城西消防栓-01', type: PatrolPointType.hydrant, lat: 30.2758, lng: 120.1438, order: 2),
    PatrolPoint(id: 'PP027', name: '翠湖花园加压站', type: PatrolPointType.pumpStation, lat: 30.2765, lng: 120.1425, order: 3),
    PatrolPoint(id: 'PP028', name: '城西排气阀', type: PatrolPointType.valve, lat: 30.2772, lng: 120.1412, order: 4),
    PatrolPoint(id: 'PP029', name: '城西测流点', type: PatrolPointType.meter, lat: 30.2780, lng: 120.1400, order: 5),
    PatrolPoint(id: 'PP030', name: '城西末端压力表', type: PatrolPointType.meter, lat: 30.2788, lng: 120.1388, order: 6),
  ];

  static final List<PatrolPoint> _mockPointsSouth = [
    PatrolPoint(id: 'PP031', name: '城南阀门井-01', type: PatrolPointType.valve, lat: 30.2650, lng: 120.1520, order: 1),
    PatrolPoint(id: 'PP032', name: '城南加压站', type: PatrolPointType.pumpStation, lat: 30.2640, lng: 120.1530, order: 2),
    PatrolPoint(id: 'PP033', name: '阳光小区消防栓', type: PatrolPointType.hydrant, lat: 30.2630, lng: 120.1540, order: 3),
    PatrolPoint(id: 'PP034', name: '城南排气阀', type: PatrolPointType.valve, lat: 30.2620, lng: 120.1550, order: 4),
    PatrolPoint(id: 'PP035', name: '城南测流点', type: PatrolPointType.meter, lat: 30.2610, lng: 120.1560, order: 5),
    PatrolPoint(id: 'PP036', name: '学校管网接口', type: PatrolPointType.junction, lat: 30.2600, lng: 120.1570, order: 6),
    PatrolPoint(id: 'PP037', name: '医院管网接口', type: PatrolPointType.junction, lat: 30.2590, lng: 120.1580, order: 7),
    PatrolPoint(id: 'PP038', name: '城南末端压力表', type: PatrolPointType.meter, lat: 30.2580, lng: 120.1590, order: 8),
    PatrolPoint(id: 'PP039', name: '城南消防栓-02', type: PatrolPointType.hydrant, lat: 30.2570, lng: 120.1600, order: 9),
    PatrolPoint(id: 'PP040', name: '城南回水阀门', type: PatrolPointType.valve, lat: 30.2560, lng: 120.1610, order: 10),
  ];
}

// ==================== 数据模型 ====================

/// 巡检任务状态
enum PatrolTaskStatus {
  pending('待执行'),
  ongoing('进行中'),
  completed('已完成');

  final String label;
  const PatrolTaskStatus(this.label);
}

/// 巡检优先级
enum PatrolPriority {
  high('高', 0xFFF44336),
  medium('中', 0xFFFF9800),
  low('低', 0xFF4CAF50);

  final String label;
  final int color;
  const PatrolPriority(this.label, this.color);
}

/// 巡检结果
enum PatrolResult {
  normal('正常'),
  issueFound('发现问题');

  final String label;
  const PatrolResult(this.label);
}

/// 巡检点类型
enum PatrolPointType {
  valve('阀门井'),
  pumpStation('泵站'),
  hydrant('消防栓'),
  meter('仪表'),
  junction('管网接口'),
  electrical('配电柜'),
  equipment('设备'),
  reservoir('水池');

  final String label;
  const PatrolPointType(this.label);
}

/// 巡检点状态
enum PatrolPointStatus {
  normal('正常'),
  abnormal('异常'),
  maintenance('需维护');

  final String label;
  const PatrolPointStatus(this.label);
}

/// 巡检点
class PatrolPoint {
  final String id;
  final String name;
  final PatrolPointType type;
  final double lat;
  final double lng;
  final int order;
  PatrolPointStatus? status;
  String? remark;
  List<String>? photos;

  PatrolPoint({
    required this.id,
    required this.name,
    required this.type,
    required this.lat,
    required this.lng,
    required this.order,
    this.status,
    this.remark,
    this.photos,
  });
}

/// GPS 轨迹点
class TrackPoint {
  final String id;
  final double lat;
  final double lng;
  final double altitude;
  final double speed;
  final DateTime timestamp;
  final String address;

  const TrackPoint({
    required this.id,
    required this.lat,
    required this.lng,
    required this.altitude,
    required this.speed,
    required this.timestamp,
    required this.address,
  });
}

/// 巡检任务
class PatrolTask {
  final String id;
  final String routeName;
  final DateTime date;
  final int totalPoints;
  final int completedPoints;
  final PatrolPriority priority;
  final PatrolTaskStatus status;
  final String assignee;
  final String description;
  final List<PatrolPoint> points;
  final PatrolResult? result;
  final DateTime? reportTime;
  final String? issues;

  const PatrolTask({
    required this.id,
    required this.routeName,
    required this.date,
    required this.totalPoints,
    required this.completedPoints,
    required this.priority,
    required this.status,
    required this.assignee,
    required this.description,
    required this.points,
    this.result,
    this.reportTime,
    this.issues,
  });

  double get progress => totalPoints > 0 ? completedPoints / totalPoints : 0;

  String get dateStr =>
      '${date.year}-${date.month.toString().padLeft(2, '0')}-${date.day.toString().padLeft(2, '0')}';
}