import 'dart:async';
import 'package:background_downloader/background_downloader.dart';
import 'package:clock/clock.dart';
import 'package:drift/drift.dart' show Value;
import 'package:flutter/foundation.dart';
import 'package:twonly/globals.dart';
import 'package:twonly/src/database/tables/mediafiles.table.dart';
import 'package:twonly/src/database/twonly.db.dart';
import 'package:twonly/src/services/api/mediafiles/download.service.dart';
import 'package:twonly/src/services/api/mediafiles/upload.service.dart';
import 'package:twonly/src/services/mediafiles/mediafile.service.dart';
import 'package:twonly/src/services/twonly_safe/create_backup.twonly_safe.dart';
import 'package:twonly/src/utils/log.dart';

Future<void> initFileDownloader() async {
  FileDownloader().updates.listen((update) async {
    switch (update) {
      case TaskStatusUpdate():
        if (update.task.taskId.contains('upload_')) {
          await handleUploadStatusUpdate(update);
        }
        if (update.task.taskId.contains('download_')) {
          await handleDownloadStatusUpdate(update);
        }
        if (update.task.taskId.contains('backup')) {
          await handleBackupStatusUpdate(update);
        }
      case TaskProgressUpdate():
        Log.info(
          'Progress update for ${update.task} with progress ${update.progress}',
        );
    }
  });

  await FileDownloader().start();

  try {
    var androidConfig = [];
    if (!kReleaseMode) {
      androidConfig = [(Config.bypassTLSCertificateValidation, true)];
    }
    await FileDownloader().configure(androidConfig: androidConfig);
  } catch (e) {
    Log.error(e);
  }

  if (!kReleaseMode) {
    FileDownloader().configureNotification(
      running: const TaskNotification(
        'Uploading/Downloading',
        '{filename} ({progress}).',
      ),
      progressBar: true,
    );
  }
}

Future<void> handleUploadStatusUpdate(TaskStatusUpdate update) async {
  final mediaId = update.task.taskId.replaceAll('upload_', '');
  final media = await twonlyDB.mediaFilesDao.getMediaFileById(mediaId);

  if (update.status == TaskStatus.running) {
    // Ignore these updates
    return;
  }

  if (media == null) {
    Log.error(
      'Got an upload task but no upload media in the media upload database',
    );
    return;
  }

  if (update.status == TaskStatus.complete) {
    if (update.responseStatusCode == 200) {
      Log.info('Upload of ${media.mediaId} success!');

      await twonlyDB.mediaFilesDao.updateMedia(
        media.mediaId,
        const MediaFilesCompanion(
          uploadState: Value(UploadState.uploaded),
        ),
      );

      /// As the messages where send in a bulk acknowledge all messages.

      final messages =
          await twonlyDB.messagesDao.getMessagesByMediaId(media.mediaId);
      for (final message in messages) {
        final contacts =
            await twonlyDB.groupsDao.getGroupNonLeftMembers(message.groupId);
        for (final contact in contacts) {
          await twonlyDB.messagesDao.handleMessageAckByServer(
            contact.contactId,
            message.messageId,
            clock.now(),
          );
        }
      }

      return;
    }
    Log.error(
      'Got HTTP error ${update.responseStatusCode} for $mediaId',
    );
  }

  if (update.status == TaskStatus.notFound) {
    await twonlyDB.mediaFilesDao.updateMedia(
      mediaId,
      const MediaFilesCompanion(
        uploadState: Value(UploadState.uploadLimitReached),
      ),
    );
    Log.info(
      'Background upload failed for $mediaId with status ${update.responseStatusCode}. Not trying again.',
    );
    return;
  }

  Log.info(
    'Background status $mediaId with status ${update.status} and ${update.responseStatusCode}. ',
  );

  if (update.status == TaskStatus.failed ||
      update.status == TaskStatus.canceled) {
    Log.error(
      'Background upload failed for $mediaId with status ${update.status} and ${update.responseStatusCode}. ',
    );
    final mediaService = MediaFileService(media);

    await mediaService.setUploadState(UploadState.uploading);
    // In all other cases just try the upload again...
    await startBackgroundMediaUpload(mediaService);
  }
}