import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:get/get.dart';
import 'package:on_field_work/controller/project_controller.dart';
import 'package:on_field_work/helpers/services/api_endpoints.dart';
import 'package:on_field_work/helpers/services/storage/local_storage.dart';
import 'package:on_field_work/helpers/services/app_logger.dart';
import 'package:on_field_work/helpers/services/auth_service.dart';
import 'package:on_field_work/model/tenant/tenant_list_model.dart';
import 'package:on_field_work/helpers/utils/encryption_helper.dart';

abstract class ITenantService {
Future<List<Map<String, dynamic>>?> getTenants({bool hasRetried = false});
Future<bool> selectTenant(String tenantId, {bool hasRetried = false});
}

class TenantService implements ITenantService {
static const String _baseUrl = ApiEndpoints.baseUrl;
static const Map<String, String> _headers = {
'Content-Type': 'application/json',
};

static Tenant? currentTenant;

static void setSelectedTenant(Tenant tenant) {
currentTenant = tenant;
}

static bool get isTenantSelected => currentTenant != null;

static Future<Map<String, String>> _authorizedHeaders() async {
final token = await LocalStorage.getJwtToken();
if (token == null || token.isEmpty) throw Exception('Missing JWT token');
return {..._headers, 'Authorization': 'Bearer $token'};
}

static void _handleApiError(http.Response response, dynamic data, String context) {
final message = data['message'] ?? 'Unknown error';
final level = response.statusCode >= 500 ? LogLevel.error : LogLevel.warning;
logSafe("❌ $context failed: $message [Status: ${response.statusCode}]", level: level);
}

static void _logException(dynamic e, dynamic st, String context) {
logSafe("❌ $context exception", level: LogLevel.error, error: e, stackTrace: st);
}

@override
Future<List<Map<String, dynamic>>?> getTenants({bool hasRetried = false}) async {
try {
final headers = await _authorizedHeaders();
final response = await http.get(Uri.parse("$_baseUrl/auth/get/user/tenants"), headers: headers);

  if (response.body.isEmpty || response.body.trim().isEmpty) {
    logSafe("❌ Empty tenant response — auto logout");
    await LocalStorage.logout();
    return null;
  }

  final decrypted = decryptResponse(response.body);
  if (decrypted == null) {
    logSafe("❌ Tenant response decryption failed — auto logout");
    await LocalStorage.logout();
    return null;
  }

  final data = decrypted is Map ? decrypted : null;
  if (data == null) {
    logSafe("❌ Decrypted tenant data is not valid JSON — auto logout");
    await LocalStorage.logout();
    return null;
  }

  if (response.statusCode == 200 && data['success'] == true) {
    final list = data['data'];
    if (list is! List) return null;
    return List<Map<String, dynamic>>.from(list);
  }

  if (response.statusCode == 401 && !hasRetried) {
    final refreshed = await AuthService.refreshToken();
    if (refreshed) return getTenants(hasRetried: true);
    return null;
  }

  _handleApiError(response, data, "Fetching tenants");
  return null;
} catch (e, st) {
  _logException(e, st, "Get Tenants API");
  return null;
}


}

@override
Future<bool> selectTenant(String tenantId, {bool hasRetried = false}) async {
try {
final headers = await _authorizedHeaders();
logSafe("➡️ POST $_baseUrl/auth/select-tenant/$tenantId\nHeaders: $headers", level: LogLevel.info);

  final response = await http.post(Uri.parse("$_baseUrl/auth/select-tenant/$tenantId"), headers: headers);
  final decrypted = decryptResponse(response.body);
  if (decrypted == null) {
    logSafe("❌ Tenant selection response decryption failed", level: LogLevel.error);
    return false;
  }

  final data = decrypted is Map ? decrypted : null;
  if (data == null) {
    logSafe("❌ Decrypted tenant selection data is not valid JSON", level: LogLevel.error);
    return false;
  }

  logSafe("⬅️ Response: ${jsonEncode(data)} [Status: ${response.statusCode}]", level: LogLevel.info);

  if (response.statusCode == 200 && data['success'] == true) {
    await LocalStorage.setJwtToken(data['data']['token']);
    await LocalStorage.setRefreshToken(data['data']['refreshToken']);
    logSafe("✅ Tenant selected successfully. Tokens updated.");

    try {
      final projectController = Get.find<ProjectController>();
      projectController.clearProjects();
      projectController.fetchProjects();
    } catch (_) {
      logSafe("⚠️ ProjectController not found while refreshing projects");
    }

    final fcmToken = LocalStorage.getFcmToken();
    if (fcmToken?.isNotEmpty ?? false) {
      final success = await AuthService.registerDeviceToken(fcmToken!);
      logSafe(success ? "✅ FCM token registered after tenant selection." : "⚠️ Failed to register FCM token.", level: success ? LogLevel.info : LogLevel.warning);
    }

    return true;
  }

  if (response.statusCode == 401 && !hasRetried) {
    logSafe("⚠️ Unauthorized while selecting tenant. Refreshing token...", level: LogLevel.warning);
    final refreshed = await AuthService.refreshToken();
    if (refreshed) return selectTenant(tenantId, hasRetried: true);
    logSafe("❌ Token refresh failed while selecting tenant.", level: LogLevel.error);
    return false;
  }

  _handleApiError(response, data, "Selecting tenant");
  return false;
} catch (e, st) {
  _logException(e, st, "Select Tenant API");
  return false;
}


}
}