// lib/services/marine_tarball_sampling_service.dart

import 'dart:io';
import 'dart:convert';
import 'package:flutter/foundation.dart';
import 'package:path/path.dart' as p;

import 'package:environment_monitoring_app/models/tarball_data.dart';
import 'package:environment_monitoring_app/services/local_storage_service.dart';
import 'package:environment_monitoring_app/services/server_config_service.dart';
import 'package:environment_monitoring_app/services/zipping_service.dart';
import 'package:environment_monitoring_app/services/api_service.dart';
import 'package:environment_monitoring_app/services/submission_api_service.dart';
import 'package:environment_monitoring_app/services/submission_ftp_service.dart';
import 'package:environment_monitoring_app/services/telegram_service.dart';

/// A dedicated service to handle all business logic for the Marine Tarball Sampling feature.
class MarineTarballSamplingService {
  final SubmissionApiService _submissionApiService = SubmissionApiService();
  final SubmissionFtpService _submissionFtpService = SubmissionFtpService();
  final ZippingService _zippingService = ZippingService();
  final LocalStorageService _localStorageService = LocalStorageService();
  final ServerConfigService _serverConfigService = ServerConfigService();
  final DatabaseHelper _dbHelper = DatabaseHelper();
  // MODIFIED: Declare the service, but do not initialize it here.
  final TelegramService _telegramService;

  // ADDED: A constructor to accept the global TelegramService instance.
  MarineTarballSamplingService(this._telegramService);

  Future<Map<String, dynamic>> submitTarballSample({
    required TarballSamplingData data,
    required List<Map<String, dynamic>>? appSettings,
  }) async {
    const String moduleName = 'marine_tarball';
    final serverName = (await _serverConfigService.getActiveApiConfig())?['config_name'] as String? ?? 'Default';

    final imageFilesWithNulls = data.toImageFiles();
    imageFilesWithNulls.removeWhere((key, value) => value == null);
    final Map<String, File> finalImageFiles = imageFilesWithNulls.cast<String, File>();

    // START CHANGE: Revert to the correct two-step API submission process
    // --- Step 1A: API Data Submission ---
    debugPrint("Step 1A: Submitting Tarball form data...");
    final apiDataResult = await _submissionApiService.submitPost(
      moduleName: moduleName,
      endpoint: 'marine/tarball/sample',
      body: data.toFormData(),
    );

    if (apiDataResult['success'] != true) {
      // If the initial data submission fails, log and exit early.
      await _logAndSave(data: data, status: 'L1', message: apiDataResult['message']!, apiResults: [apiDataResult], ftpStatuses: [], serverName: serverName, finalImageFiles: finalImageFiles);
      return {'success': false, 'message': apiDataResult['message']};
    }

    final recordId = apiDataResult['data']?['autoid']?.toString();
    if (recordId == null) {
      await _logAndSave(data: data, status: 'L1', message: 'API Error: Missing record ID.', apiResults: [apiDataResult], ftpStatuses: [], serverName: serverName, finalImageFiles: finalImageFiles);
      return {'success': false, 'message': 'API Error: Missing record ID.'};
    }
    data.reportId = recordId;

    // --- Step 1B: API Image Submission ---
    debugPrint("Step 1B: Submitting Tarball images...");
    final apiImageResult = await _submissionApiService.submitMultipart(
      moduleName: moduleName,
      endpoint: 'marine/tarball/images',
      fields: {'autoid': recordId},
      files: finalImageFiles,
    );
    final bool apiSuccess = apiImageResult['success'] == true;
    // END CHANGE

    // --- Step 2: FTP Submission ---
    final stationCode = data.selectedStation?['tbl_station_code'] ?? 'NA';
    final fileTimestamp = "${data.samplingDate}_${data.samplingTime}".replaceAll(':', '-').replaceAll(' ', '_');
    final baseFileName = '${stationCode}_$fileTimestamp';

    final Directory? logDirectory = await _localStorageService.getLogDirectory(
      serverName: serverName,
      module: 'marine',
      subModule: 'marine_tarball_sampling',
    );

    final Directory? localSubmissionDir = logDirectory != null ? Directory(p.join(logDirectory.path, data.reportId ?? baseFileName)) : null;
    if (localSubmissionDir != null && !await localSubmissionDir.exists()) {
      await localSubmissionDir.create(recursive: true);
    }

    final dataZip = await _zippingService.createDataZip(
      jsonDataMap: {'data.json': jsonEncode(data.toDbJson())},
      baseFileName: baseFileName,
      destinationDir: localSubmissionDir,
    );

    Map<String, dynamic> ftpDataResult = {'success': true, 'statuses': []};
    if (dataZip != null) {
      ftpDataResult = await _submissionFtpService.submit(
        moduleName: moduleName,
        fileToUpload: dataZip,
        remotePath: '/${p.basename(dataZip.path)}',
      );
    }

    final imageZip = await _zippingService.createImageZip(
      imageFiles: finalImageFiles.values.toList(),
      baseFileName: baseFileName,
      destinationDir: localSubmissionDir,
    );

    Map<String, dynamic> ftpImageResult = {'success': true, 'statuses': []};
    if (imageZip != null) {
      ftpImageResult = await _submissionFtpService.submit(
        moduleName: moduleName,
        fileToUpload: imageZip,
        remotePath: '/${p.basename(imageZip.path)}',
      );
    }
    final bool ftpSuccess = (ftpDataResult['success'] == true && ftpImageResult['success'] == true);

    // --- Step 3: Finalize and Log ---
    String finalStatus;
    String finalMessage;
    if (apiSuccess) {
      finalStatus = ftpSuccess ? 'S4' : 'S3';
      finalMessage = ftpSuccess ? 'Data submitted successfully.' : 'Data sent to API. FTP upload failed/queued.';
    } else {
      finalStatus = ftpSuccess ? 'L4' : 'L1';
      finalMessage = ftpSuccess ? 'API failed, but files sent to FTP.' : 'All submission attempts failed.';
    }

    await _logAndSave(
        data: data,
        status: finalStatus,
        message: finalMessage,
        apiResults: [apiDataResult, apiImageResult], // Log results from both API steps
        ftpStatuses: [...ftpDataResult['statuses'], ...ftpImageResult['statuses']],
        serverName: serverName,
        finalImageFiles: finalImageFiles
    );

    if (apiSuccess || ftpSuccess) {
      _handleTarballSuccessAlert(data, appSettings, isDataOnly: !apiSuccess);
    }

    return {'success': apiSuccess || ftpSuccess, 'message': finalMessage, 'reportId': data.reportId};
  }

  // Added a helper to reduce code duplication in the main submit method
  Future<void> _logAndSave({
    required TarballSamplingData data,
    required String status,
    required String message,
    required List<Map<String, dynamic>> apiResults,
    required List<Map<String, dynamic>> ftpStatuses,
    required String serverName,
    required Map<String, File> finalImageFiles,
  }) async {
    data.submissionStatus = status;
    data.submissionMessage = message;
    final fileTimestamp = "${data.samplingDate}_${data.samplingTime}".replaceAll(':', '-').replaceAll(' ', '_');

    await _localStorageService.saveTarballSamplingData(data, serverName: serverName);

    final logData = {
      'submission_id': data.reportId ?? fileTimestamp,
      'module': 'marine',
      'type': 'Tarball',
      'status': status,
      'message': message,
      'report_id': data.reportId,
      'created_at': DateTime.now().toIso8601String(),
      'form_data': jsonEncode(data.toDbJson()),
      'image_data': jsonEncode(finalImageFiles.values.map((f) => f.path).toList()),
      'server_name': serverName,
      'api_status': jsonEncode(apiResults),
      'ftp_status': jsonEncode(ftpStatuses),
    };
    await _dbHelper.saveSubmissionLog(logData);
  }

  Future<void> _handleTarballSuccessAlert(TarballSamplingData data, List<Map<String, dynamic>>? appSettings, {required bool isDataOnly}) async {
    try {
      final message = data.generateTelegramAlertMessage(isDataOnly: isDataOnly);
      final bool wasSent = await _telegramService.sendAlertImmediately('marine_tarball', message, appSettings);
      if (!wasSent) {
        await _telegramService.queueMessage('marine_tarball', message, appSettings);
      }
    } catch (e) {
      debugPrint("Failed to handle Tarball Telegram alert: $e");
    }
  }
}