import 'package:aves/main.dart';
import 'package:aves/model/image_entry.dart';
import 'package:aves/model/settings.dart';
import 'package:aves/model/source/collection_lens.dart';
import 'package:aves/services/image_file_service.dart';
import 'package:aves/services/viewer_service.dart';
import 'package:aves/utils/android_file_utils.dart';
import 'package:aves/widgets/album/collection_page.dart';
import 'package:aves/widgets/common/data_providers/media_store_collection_provider.dart';
import 'package:aves/widgets/common/icons.dart';
import 'package:aves/widgets/fullscreen/fullscreen_page.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:pedantic/pedantic.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:screen/screen.dart';

class HomePage extends StatefulWidget {
  const HomePage();

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  MediaStoreSource _mediaStore;
  ImageEntry _viewerEntry;
  Future<void> _appSetup;

  @override
  void initState() {
    super.initState();
    _appSetup = _setup();
    imageCache.maximumSizeBytes = 512 * (1 << 20);
    Screen.keepOn(true);
  }

  Future<void> _setup() async {
    final permissions = await [
      Permission.storage,
      // to access media with unredacted metadata with scoped storage (Android 10+)
      Permission.accessMediaLocation,
    ].request();
    if (permissions[Permission.storage] != PermissionStatus.granted) {
      unawaited(SystemNavigator.pop());
      return;
    }

    await androidFileUtils.init(); // 170ms

    final intentData = await ViewerService.getIntentData();
    if (intentData != null) {
      final action = intentData['action'];
      switch (action) {
        case 'view':
          AvesApp.mode = AppMode.view;
          _viewerEntry = await _initViewerEntry(
            uri: intentData['uri'],
            mimeType: intentData['mimeType'],
          );
          if (_viewerEntry == null) {
            // fallback to default mode when we fail to retrieve the entry
            AvesApp.mode = AppMode.main;
          }
          break;
        case 'pick':
          AvesApp.mode = AppMode.pick;
          // TODO TLAD apply pick mimetype(s)
          // some apps define multiple types, separated by a space (maybe other signs too, like `,` `;`?)
          String pickMimeTypes = intentData['mimeType'];
          debugPrint('pick mimeType=$pickMimeTypes');
          break;
      }
    }

    if (AvesApp.mode != AppMode.view) {
      _mediaStore = MediaStoreSource();
      await _mediaStore.init();
      unawaited(_mediaStore.refresh());
    }
  }

  Future<ImageEntry> _initViewerEntry({@required String uri, @required String mimeType}) async {
    final entry = await ImageFileService.getImageEntry(uri, mimeType);
    if (entry != null) {
      // cataloguing is essential for geolocation and video rotation
      await entry.catalog();
      unawaited(entry.locate());
    }
    return entry;
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<void>(
        future: _appSetup,
        builder: (context, snapshot) {
          if (snapshot.hasError) return const Icon(AIcons.error);
          if (snapshot.connectionState != ConnectionState.done) return const Scaffold();
          if (AvesApp.mode == AppMode.view) {
            return SingleFullscreenPage(entry: _viewerEntry);
          }
          if (_mediaStore != null) {
            return CollectionPage(CollectionLens(
              source: _mediaStore,
              groupFactor: settings.collectionGroupFactor,
              sortFactor: settings.collectionSortFactor,
            ));
          }
          return const SizedBox.shrink();
        });
  }
}