import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/foundation.dart';
import 'package:mobile_monitoring/data/models/service_result.dart';

/// Model untuk data monitoring
class MonitoringData {
  final String ph;
  final String nutrisi;
  final String phStatus;
  final String nutrientStatus;
  final bool pumpPhUp;
  final bool pumpPhDown;
  final bool pumpNutrient;
  final bool pumpWater;
  final bool isPhAbnormal;
  final bool isNutrientAbnormal;

  MonitoringData({
    required this.ph,
    required this.nutrisi,
    required this.phStatus,
    required this.nutrientStatus,
    required this.pumpPhUp,
    required this.pumpPhDown,
    required this.pumpNutrient,
    required this.pumpWater,
    required this.isPhAbnormal,
    required this.isNutrientAbnormal,
  });
}

/// Model untuk status error
class HomeDataError {
  final String displayMessage;
  final String detailMessage;
  final ErrorType errorType;

  HomeDataError({
    required this.displayMessage,
    required this.detailMessage,
    required this.errorType,
  });

  factory HomeDataError.fromException(Object error) {
    final errorMsg = error.toString();
    debugPrint('[HomeService] Error: $errorMsg');

    bool isPermissionError = errorMsg.contains('permission') || errorMsg.contains('Permission');
    bool isNotAuthError = errorMsg.contains('terautentikasi');

    if (isPermissionError) {
      return HomeDataError(
        displayMessage: 'Akses Ditolak',
        detailMessage: 'Anda tidak memiliki izin untuk melihat data ini',
        errorType: ErrorType.permission,
      );
    } else if (isNotAuthError) {
      return HomeDataError(
        displayMessage: 'Silakan Login',
        detailMessage: 'Sesi Anda telah berakhir, login kembali',
        errorType: ErrorType.authentication,
      );
    } else {
      return HomeDataError(
        displayMessage: 'Gagal memuat data',
        detailMessage: 'Pastikan koneksi internet stabil',
        errorType: ErrorType.network,
      );
    }
  }
}

enum ErrorType {
  permission,
  authentication,
  network,
  unknown,
}

/// Service untuk Home Page - Backend Logic
class HomeService {
  final FirebaseAuth _auth = FirebaseAuth.instance;

  ServiceResult<String?> getCurrentUserIdResult() {
    final uid = _auth.currentUser?.uid;
    debugPrint('[HomeService] getCurrentUserIdResult()');
    debugPrint('  Current user email: ${_auth.currentUser?.email}');
    debugPrint('  Retrieved UID: "$uid"');
    debugPrint('  UID length: ${uid?.length ?? 0}');
    debugPrint('  UID is empty: ${uid?.isEmpty ?? true}');
    if (uid == null || uid.isEmpty) {
      return ServiceResult.failure(
        message: 'User tidak terautentikasi',
        errorCode: 'unauthenticated',
      );
    }
    return ServiceResult.success(
      message: 'User ID berhasil diambil',
      data: uid,
    );
  }

  /// Get current user
  User? getCurrentUser() {
    return _auth.currentUser;
  }

  /// Get user display name
  String getUserDisplayName() {
    final name = _auth.currentUser?.displayName;
    return name?.isNotEmpty == true ? name! : 'Petani';
  }

  /// Get user initials untuk avatar
  String getUserInitials(String? name) {
    if (name == null || name.isEmpty) return 'U';
    final parts = name.trim().split(' ');
    if (parts.length >= 2) {
      return '${parts[0][0]}${parts[1][0]}'.toUpperCase();
    }
    return name[0].toUpperCase();
  }

  MonitoringData _parseMonitoringData(Map<String, dynamic> data) {
    debugPrint('[HomeService] parseMonitoringData()');
    debugPrint('  Raw data: ${data.toString()}');

    // Extract pump status
    final pumpPhUp = data['pump_ph_up_status'] ?? false;
    final pumpPhDown = data['pump_ph_down_status'] ?? false;
    final pumpNutrient = data['pump_nutrient_status'] ?? false;
    final pumpWater = data['pump_water_status'] ?? false;

    // Determine abnormality status
    final bool isPhAbnormal = pumpPhUp || pumpPhDown;
    final bool isNutrientAbnormal = pumpNutrient || pumpWater;

    // Determine user-friendly status
    final String phStatus = isPhAbnormal ? 'Abnormal' : 'Normal';
    final String nutrientStatus = isNutrientAbnormal ? 'Abnormal' : 'Normal';

    // Extract and format values
    final ph = data['pH_value']?.toString() ?? '-';
    final nutrisi = data['nutrient_level']?.toString() ?? '-';

    debugPrint('  Parsed pH: $ph, status: $phStatus');
    debugPrint('  Parsed nutrient: $nutrisi, status: $nutrientStatus');
    debugPrint('  Pump status - PhUp: $pumpPhUp, PhDown: $pumpPhDown, Nutrient: $pumpNutrient, Water: $pumpWater');

    return MonitoringData(
      ph: ph,
      nutrisi: nutrisi,
      phStatus: phStatus,
      nutrientStatus: nutrientStatus,
      pumpPhUp: pumpPhUp,
      pumpPhDown: pumpPhDown,
      pumpNutrient: pumpNutrient,
      pumpWater: pumpWater,
      isPhAbnormal: isPhAbnormal,
      isNutrientAbnormal: isNutrientAbnormal,
    );
  }

  ServiceResult<MonitoringData> parseMonitoringDataResult(Map<String, dynamic> data) {
    try {
      final parsed = _parseMonitoringData(data);
      return ServiceResult.success(
        message: 'Data monitoring berhasil diproses',
        data: parsed,
      );
    } catch (e) {
      return ServiceResult.failure(
        message: 'Gagal memproses data monitoring',
        errorCode: 'parse_error',
      );
    }
  }

  /// Validate user authentication
  bool isUserAuthenticated() {
    final user = _auth.currentUser;
    final isAuth = user != null && user.uid.isNotEmpty;
    debugPrint('[HomeService] isUserAuthenticated: $isAuth');
    return isAuth;
  }

  /// Check if user ID is valid
  bool isValidUserId(String? userId) {
    final isValid = userId != null && userId.isNotEmpty;
    debugPrint('[HomeService] isValidUserId("$userId"): $isValid');
    return isValid;
  }

  ServiceResult<HomeDataError> getErrorInfoResult(Object error) {
    return ServiceResult.success(
      message: 'Error info berhasil dipetakan',
      data: HomeDataError.fromException(error),
    );
  }
}