import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_bugly/flutter_bugly.dart';
import 'package:intl/intl.dart';
import 'package:dio/dio.dart';
import 'package:path_provider/path_provider.dart';
import 'package:open_file/open_file.dart';
import 'package:permission_handler/permission_handler.dart';

Future checkUpgrade(context, key) async {
  final upgradeInfo = await FlutterBugly.getUpgradeInfo();
  if (upgradeInfo == null) {
    return false;
  }
  return await showUpgradeDialog(context, upgradeInfo, key);
}

Future showUpgradeDialog(context, upgradeInfo, key) async {
  return await showGeneralDialog(
    context: context,
    barrierDismissible: false,
    pageBuilder: (BuildContext buildContext, Animation<double> animation, Animation<double> secondaryAnimation) {
      return WillPopScope(
        onWillPop: () {
          return Future.value(false);
        },
        child: Center(
          child: Material(
            color: Colors.transparent,
            child: UpgradeDialog(upgradeInfo, key: key),
          ),
        ),
      );
    },
    barrierLabel: MaterialLocalizations.of(context).modalBarrierDismissLabel,
    barrierColor: Colors.black87,
    transitionDuration: const Duration(milliseconds: 300),
  );
}

Future downloadApk(context, url) async {
  return await showGeneralDialog(
    context: context,
    barrierDismissible: false,
    pageBuilder: (BuildContext buildContext, Animation<double> animation, Animation<double> secondaryAnimation) {
      return Center(
        child: Material(
          color: Colors.transparent,
          child: DownloadDialog(url),
        ),
      );
    },
    barrierLabel: MaterialLocalizations.of(context).modalBarrierDismissLabel,
    barrierColor: Colors.black87,
    transitionDuration: const Duration(milliseconds: 300),
  );
}

class UpgradeDialog extends StatefulWidget {
  final UpgradeInfo upgradeInfo;

  UpgradeDialog(this.upgradeInfo, {Key key}) : super(key: key);

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

class UpgradeDialogState extends State<UpgradeDialog> {
  final Color primaryColor = Color(0xFF1990F8);
  final Color bgColor = Color(0xE6293559);

  @override
  Widget build(BuildContext context) {
    return Container(
      width: 280,
      padding: EdgeInsets.only(left: 20, right: 20),
      decoration: BoxDecoration(color: bgColor, border: Border.all(width: 1, color: primaryColor)),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.start,
        crossAxisAlignment: CrossAxisAlignment.stretch,
        mainAxisSize: MainAxisSize.min,
        children: <Widget>[
          Container(
            margin: EdgeInsets.only(top: 20),
            child: Text(
              widget.upgradeInfo.title,
              style: TextStyle(color: primaryColor, fontSize: 16, fontWeight: FontWeight.bold),
              textAlign: TextAlign.center,
            ),
          ),
          Container(
            margin: EdgeInsets.only(top: 15),
            child: Text(
              '版本：' + widget.upgradeInfo.versionName,
              style: TextStyle(color: Colors.white),
            ),
          ),
          Container(
            margin: EdgeInsets.only(top: 10),
            child: Text(
              '包大小：' + (widget.upgradeInfo.fileSize / 1024 / 1024).toStringAsFixed(0) + 'MB',
              style: TextStyle(color: Colors.white),
            ),
          ),
          Container(
            margin: EdgeInsets.only(top: 10),
            child: Text(
              '更新时间：' + DateFormat('yyyy-MM-dd HH:mm:ss').format(DateTime.fromMicrosecondsSinceEpoch(widget.upgradeInfo.publishTime * 1000)),
              style: TextStyle(color: Colors.white),
            ),
          ),
          Container(
            margin: EdgeInsets.only(top: 10),
            child: Text(
              '更新说明：',
              style: TextStyle(color: Colors.white),
            ),
          ),
          Container(
            margin: EdgeInsets.only(top: 6),
            child: Text(
              widget.upgradeInfo.newFeature,
              style: TextStyle(color: Colors.white),
            ),
          ),
          Container(
            margin: EdgeInsets.only(bottom: 20, top: 20),
            child: Row(
              children: <Widget>[
                widget.upgradeInfo.upgradeType == 2
                    ? Container()
                    : Expanded(
                        child: MaterialButton(
                          elevation: 0,
                          highlightElevation: 0,
                          minWidth: 100,
                          height: 36,
                          color: Color(0xFF4F5C87),
                          child: Text(
                            '下次再说',
                            style: TextStyle(color: Colors.white),
                          ),
                          onPressed: () {
                            Navigator.of(context).pop();
                          },
                        ),
                      ),
                widget.upgradeInfo.upgradeType == 2 ? Container() : Container(width: 20),
                Expanded(
                  child: MaterialButton(
                    elevation: 0,
                    highlightElevation: 0,
                    minWidth: 100,
                    height: 36,
                    color: primaryColor,
                    child: Text(
                      '立即更新',
                      style: TextStyle(color: Colors.white),
                    ),
                    onPressed: () async {
                      PermissionStatus permission = await PermissionHandler().checkPermissionStatus(PermissionGroup.storage);
                      if (permission == PermissionStatus.denied) {
                        Map<PermissionGroup, PermissionStatus> permissions = await PermissionHandler().requestPermissions([PermissionGroup.storage]);
                        if (permissions[PermissionGroup.storage] == PermissionStatus.denied) {
                          showDialog(
                              context: context,
                              barrierDismissible: false,
                              builder: (context) {
                                return AlertDialog(
                                  content: Text(
                                    '需要获取外部存储权限来下载安装包',
                                    style: TextStyle(color: Colors.black),
                                  ),
                                  actions: <Widget>[
                                    FlatButton(
                                      child: Text('打开设置'),
                                      onPressed: () {
                                        Navigator.of(context).pop();
                                        PermissionHandler().openAppSettings();
                                      },
                                    ),
                                  ],
                                );
                              });
                          return;
                        }
                      }
                      Navigator.of(context).pop();
                      await downloadApk(context, widget.upgradeInfo.apkUrl);
                    },
                  ),
                )
              ],
            ),
          )
        ],
      ),
    );
  }
}

class DownloadDialog extends StatefulWidget {
  final String url;

  DownloadDialog(this.url, {Key key}) : super(key: key);

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

class DownloadDialogState extends State<DownloadDialog> {
  final Color primaryColor = Color(0xFF1990F8);
  final Color bgColor = Color(0xE6293559);
  Dio dio;
  CancelToken token;
  double progress = 0;

  @override
  void initState() {
    super.initState();
    Future.delayed(Duration.zero, () async {
      final Directory tempDir = await getExternalStorageDirectory();
      final String tempPath = tempDir.path;
      final String savePath = '$tempPath/update.apk';
      dio = Dio();
      token = CancelToken();
      final res = await dio.download(
        widget.url,
        savePath,
        onReceiveProgress: (int count, int total) {
          setState(() {
            progress = count / total;
          });
        },
        options: Options(receiveTimeout: 10 * 60 * 1000),
        cancelToken: token,
      ).catchError((_error) {
        return _error;
      });
      if (res != null && res.statusCode == 200) {
        OpenFile.open(savePath);
      }
      Navigator.of(context).pop();
    });
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      width: 300,
      height: 60,
      padding: EdgeInsets.fromLTRB(15, 10, 15, 10),
      decoration: BoxDecoration(color: bgColor, border: Border.all(width: 1, color: primaryColor)),
      child: Column(
        children: <Widget>[
          Row(
            children: <Widget>[
              Expanded(
                child: Text(
                  '正在下载更新',
                  style: TextStyle(color: primaryColor, fontSize: 14),
                ),
              ),
              Text(
                (progress * 100).toStringAsFixed(0) + '%',
                style: TextStyle(color: Colors.white.withAlpha(128)),
              )
            ],
          ),
          Container(
            margin: EdgeInsets.only(top: 10),
            child: Align(
              alignment: Alignment.centerLeft,
              child: FractionallySizedBox(
                widthFactor: progress,
                child: Container(
                  height: 2,
                  color: primaryColor,
                ),
              ),
            ),
          )
        ],
      ),
    );
  }
}