import 'dart:async';

import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';
import 'package:flutter/widgets.dart';
import 'package:permission_handler/permission_handler.dart';

typedef void MofunVideoViewCreatedCallback(MofunVideoViewController controller);

const _CHANNEL = 'plugins.shuangyunbang.mofun/mofunvideoview';

class MofunVideoView extends StatefulWidget {
  final MofunVideoViewCreatedCallback onMofunVideoViewCreated;

  const MofunVideoView({
    Key key,
    this.onMofunVideoViewCreated,
  }) : super(key: key);

  @override
  State<StatefulWidget> createState() {
    return _MofunVideoViewState();
  }
}

class _MofunVideoViewState extends State<MofunVideoView> {
  MofunVideoViewController controller;

  @override
  Widget build(BuildContext context) {
    if (defaultTargetPlatform == TargetPlatform.android) {
      return AndroidView(
        viewType: _CHANNEL,
        onPlatformViewCreated: _onPlatformViewCreated,
      );
    } else if (defaultTargetPlatform == TargetPlatform.iOS) {
      return UiKitView(
        viewType: _CHANNEL,
        onPlatformViewCreated: _onPlatformViewCreated,
      );
    }
    return Text(
        '$defaultTargetPlatform is not yet supported by the text_view plugin');
  }

  void _onPlatformViewCreated(int id) {
    if (controller == null || controller.id != id) {
      controller = MofunVideoViewController._(id);
    }

    if (widget.onMofunVideoViewCreated != null) {
      widget.onMofunVideoViewCreated(controller);
    }
  }
}

class MofunVideoViewController {
  final int id;
  final MethodChannel _channel;

  bool _hasPermission = false;

  MofunVideoViewController._(this.id)
      : _channel = new MethodChannel('${_CHANNEL}_$id');

  ///检查权限。返回是否权限充足
  Future<bool> _checkPermission() async {
    List<PermissionGroup> needCheck = List();

    PermissionHandler permissionHandler = PermissionHandler();
    PermissionStatus permission =
        await permissionHandler.checkPermissionStatus(PermissionGroup.storage);
    if (permission != PermissionStatus.granted) {
      needCheck.add(PermissionGroup.storage);
    }
    permission = await permissionHandler
        .checkPermissionStatus(PermissionGroup.microphone);
    if (permission != PermissionStatus.granted) {
      needCheck.add(PermissionGroup.microphone);
    }

    if (needCheck.isEmpty) {
      return true;
    }
    Map<PermissionGroup, PermissionStatus> noPermissions =
        await permissionHandler.requestPermissions(needCheck);
    noPermissions.removeWhere((key, value) => value == PermissionStatus.granted);

    return noPermissions.isEmpty;
  }

  Future<bool> checkPermission() async{
    if(!_hasPermission){
      return _checkPermission();
    }
    return true;
  }

  Future<void> toast(String msg) async {
    return _channel.invokeMethod('toast', msg);
  }

  Future<void> play(String url) async {
    await checkPermission();
    return _channel.invokeMethod('play', url);
  }

  Future<void> stop() async {
    await checkPermission();
    return _channel.invokeMethod('stop');
  }

  Future<void> save(String output) async {
    await checkPermission();
    return _channel.invokeMethod('save', output);
  }

  Future<void> record() async {
    await checkPermission();
    return _channel.invokeMethod('record');
  }

  Future<void> playerAndResume() async {
    await checkPermission();
    return _channel.invokeMethod('playerAndResume');
  }

}