import 'dart:io';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:like_button/like_button.dart';
import 'package:logging/logging.dart';
import 'package:photo_manager/photo_manager.dart';
import 'package:photos/core/event_bus.dart';
import 'package:photos/db/files_db.dart';
import 'package:photos/events/local_photos_updated_event.dart';
import 'package:photos/models/file.dart';
import 'package:photos/services/favorites_service.dart';
import 'package:photos/services/local_sync_service.dart';
import 'package:photos/ui/custom_app_bar.dart';
import 'package:photos/utils/date_time_util.dart';
import 'package:photos/utils/delete_file_util.dart';
import 'package:photos/utils/dialog_util.dart';
import 'package:photos/utils/file_util.dart';
import 'package:photos/utils/toast_util.dart';

class FadingAppBar extends StatefulWidget implements PreferredSizeWidget {
  final File file;
  final Function(File) onFileDeleted;
  final double height;

  FadingAppBar(
    this.file,
    this.onFileDeleted,
    this.height, {
    Key key,
  }) : super(key: key);

  @override
  Size get preferredSize => Size.fromHeight(height);

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

class FadingAppBarState extends State<FadingAppBar> {
  final _logger = Logger("FadingAppBar");
  bool _shouldHide = false;

  @override
  Widget build(BuildContext context) {
    return CustomAppBar(
      AnimatedOpacity(
        child: Container(
          decoration: BoxDecoration(
            gradient: LinearGradient(
              begin: Alignment.topCenter,
              end: Alignment.bottomCenter,
              colors: [
                Colors.black.withOpacity(0.64),
                Colors.black.withOpacity(0.5),
                Colors.transparent,
              ],
              stops: [0, 0.2, 1],
            ),
          ),
          child: _buildAppBar(),
        ),
        opacity: _shouldHide ? 0 : 1,
        duration: Duration(milliseconds: 150),
      ),
      height: 100,
    );
  }

  void hide() {
    setState(() {
      _shouldHide = true;
    });
  }

  void show() {
    setState(() {
      _shouldHide = false;
    });
  }

  AppBar _buildAppBar() {
    final List<Widget> actions = [];
    actions.add(_getFavoriteButton());
    actions.add(PopupMenuButton(
      itemBuilder: (context) {
        final List<PopupMenuItem> items = [];
        if (widget.file.isRemoteFile()) {
          items.add(
            PopupMenuItem(
              value: 1,
              child: Row(
                children: [
                  Icon(Platform.isAndroid
                      ? Icons.download
                      : CupertinoIcons.cloud_download),
                  Padding(
                    padding: EdgeInsets.all(8),
                  ),
                  Text("download"),
                ],
              ),
            ),
          );
        }
        items.add(
          PopupMenuItem(
            value: 2,
            child: Row(
              children: [
                Icon(Platform.isAndroid
                    ? Icons.delete_outline
                    : CupertinoIcons.delete),
                Padding(
                  padding: EdgeInsets.all(8),
                ),
                Text("delete"),
              ],
            ),
          ),
        );
        return items;
      },
      onSelected: (value) {
        if (value == 1) {
          _download(widget.file);
        } else if (value == 2) {
          _showDeleteSheet(widget.file);
        }
      },
    ));
    return AppBar(
      title: Text(
        getDayTitle(widget.file.creationTime),
        style: TextStyle(
          fontSize: 14,
        ),
      ),
      actions: actions,
      backgroundColor: Color(0x00000000),
      elevation: 0,
    );
  }

  Widget _getFavoriteButton() {
    return FutureBuilder(
      future: FavoritesService.instance.isFavorite(widget.file),
      builder: (context, snapshot) {
        if (snapshot.hasData) {
          return _getLikeButton(widget.file, snapshot.data);
        } else {
          return _getLikeButton(widget.file, false);
        }
      },
    );
  }

  Widget _getLikeButton(File file, bool isLiked) {
    return LikeButton(
      isLiked: isLiked,
      onTap: (oldValue) async {
        final isLiked = !oldValue;
        bool hasError = false;
        if (isLiked) {
          final shouldBlockUser = file.uploadedFileID == null;
          var dialog;
          if (shouldBlockUser) {
            dialog = createProgressDialog(context, "adding to favorites...");
            await dialog.show();
          }
          try {
            await FavoritesService.instance.addToFavorites(file);
          } catch (e, s) {
            _logger.severe(e, s);
            hasError = true;
            showToast("sorry, could not add this to favorites!");
          } finally {
            if (shouldBlockUser) {
              await dialog.hide();
            }
          }
        } else {
          try {
            await FavoritesService.instance.removeFromFavorites(file);
          } catch (e, s) {
            _logger.severe(e, s);
            hasError = true;
            showToast("sorry, could not remove this from favorites!");
          }
        }
        return hasError ? oldValue : isLiked;
      },
      likeBuilder: (isLiked) {
        return Icon(
          Icons.favorite_border,
          color: isLiked ? Colors.pinkAccent : Colors.white,
          size: 24,
        );
      },
    );
  }

  void _showDeleteSheet(File file) {
    final List<Widget> actions = [];
    if (file.uploadedFileID == null) {
      actions.add(CupertinoActionSheetAction(
        child: Text("everywhere"),
        isDestructiveAction: true,
        onPressed: () async {
          await deleteFilesFromEverywhere(context, [file]);
          widget.onFileDeleted(file);
        },
      ));
    } else {
      if (file.localID != null) {
        actions.add(CupertinoActionSheetAction(
          child: Text("on this device"),
          isDestructiveAction: true,
          onPressed: () async {
            await deleteFilesOnDeviceOnly(context, [file]);
            showToast("file deleted from device");
            Navigator.of(context, rootNavigator: true).pop();
          },
        ));
      }
      actions.add(CupertinoActionSheetAction(
        child: Text("everywhere"),
        isDestructiveAction: true,
        onPressed: () async {
          await deleteFilesFromEverywhere(context, [file]);
          widget.onFileDeleted(file);
        },
      ));
    }
    final action = CupertinoActionSheet(
      title: Text("delete file?"),
      actions: actions,
      cancelButton: CupertinoActionSheetAction(
        child: Text("cancel"),
        onPressed: () {
          Navigator.of(context, rootNavigator: true).pop();
        },
      ),
    );
    showCupertinoModalPopup(context: context, builder: (_) => action);
  }

  Future<void> _download(File file) async {
    final dialog = createProgressDialog(context, "downloading...");
    await dialog.show();
    final savedAsset = await PhotoManager.editor.saveImageWithPath(
      (await getFile(file)).path,
      title: file.title,
    );
    file.localID = savedAsset.id;
    await FilesDB.instance.insert(file);
    await LocalSyncService.instance.trackDownloadedFile(file);
    Bus.instance.fire(LocalPhotosUpdatedEvent([file]));
    await dialog.hide();
    showToast("file saved to gallery");
  }
}