import 'dart:async';

import 'package:chewie/src/chewie_controller.dart';
import 'package:chewie/src/player_with_controls.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter/widgets.dart';
import 'package:screen/screen.dart';

/// A Video Player with Material and Cupertino skins.
///
/// `video_player` is pretty low level. Chewie wraps it in a friendly skin to
/// make it easy to use!
class Chewie extends StatefulWidget {
  Chewie({
    Key key,
    this.controller,
  })  : assert(controller != null, 'You must provide a chewie controller'),
        super(key: key);

  /// The [ChewieController]
  final ChewieController controller;

  @override
  ChewieState createState() {
    return ChewieState();
  }
}

class ChewieState extends State<Chewie> {
  bool _isFullScreen = false;

  @override
  void initState() {
    super.initState();
    widget.controller.addListener(listener);
  }

  @override
  void dispose() {
    widget.controller.removeListener(listener);
    super.dispose();
  }

  void listener() async {
    if (widget.controller.isFullScreen && !_isFullScreen) {
      _isFullScreen = true;
      await _pushFullScreenWidget(context);
    } else if (_isFullScreen) {
      Navigator.of(context).pop();
      _isFullScreen = false;
    }
  }

  @override
  Widget build(BuildContext context) {
    return ChewieControllerProvider(
      controller: widget.controller,
      child: PlayerWithControls(),
    );
  }

  Widget _buildFullScreenVideo(
      BuildContext context, Animation<double> animation) {
    return Scaffold(
      resizeToAvoidBottomPadding: false,
      body: Container(
        alignment: Alignment.center,
        color: Colors.black,
        child: ChewieControllerProvider(
          controller: widget.controller,
          child: PlayerWithControls(),
        ),
      ),
    );
  }

  Widget _fullScreenRoutePageBuilder(
    BuildContext context,
    Animation<double> animation,
    Animation<double> secondaryAnimation,
  ) {
    return AnimatedBuilder(
      animation: animation,
      builder: (BuildContext context, Widget child) {
        return _buildFullScreenVideo(context, animation);
      },
    );
  }

  Future<dynamic> _pushFullScreenWidget(BuildContext context) async {
    final isAndroid = Theme.of(context).platform == TargetPlatform.android;
    final TransitionRoute<Null> route = PageRouteBuilder<Null>(
      settings: RouteSettings(isInitialRoute: false),
      pageBuilder: _fullScreenRoutePageBuilder,
    );

    SystemChrome.setEnabledSystemUIOverlays([]);
    if (isAndroid) {
      SystemChrome.setPreferredOrientations([
        DeviceOrientation.landscapeLeft,
        DeviceOrientation.landscapeRight,
      ]);
    }

    if (!widget.controller.allowedScreenSleep) {
      Screen.keepOn(true);
    }

    await Navigator.of(context).push(route);

    bool isKeptOn = await Screen.isKeptOn;
    if (isKeptOn) {
      Screen.keepOn(false);
    }

    SystemChrome.setEnabledSystemUIOverlays(SystemUiOverlay.values);
    SystemChrome.setPreferredOrientations([
      DeviceOrientation.portraitUp,
      DeviceOrientation.portraitDown,
      DeviceOrientation.landscapeLeft,
      DeviceOrientation.landscapeRight,
    ]);
  }
}