import 'dart:io';

import 'package:ctjt_flutter/common/states.dart';
import 'package:ctjt_flutter/common/styles.dart';
import 'package:ctjt_flutter/common/utils.dart';
import 'package:ctjt_flutter/service/app_service.dart';
import 'package:ctjt_flutter/widget/button.dart';
import 'package:ctjt_flutter/widget/contact.dart';
import 'package:ctjt_flutter/widget/title.dart';
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:provider/provider.dart';
import 'package:r_upgrade/r_upgrade.dart';

// 关于页（APP更新页）
class AboutPage extends StatefulWidget {
  AboutPage({Key? key}) : super(key: key);

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

class _AboutPageState extends State<AboutPage> {
  final _formKey = GlobalKey<FormState>();
  late AppService _appService;
  bool isLatest = false;

  static const String LoadingTip = '正在获取...';
  TextEditingController _latestVersionController =
      TextEditingController(text: LoadingTip);
  String _downloadUrl = "";
  String _versionDescription = "";

  @override
  void initState() {
    super.initState();
    _appService = AppService.getInstance(this.context);
    initVersion();
  }

  Future<Null> initVersion() async {
    // 在common中初始化时，已获取当前APP版本并缓存，本地APP版本相对稳定，此处不再获取

    // 从服务器获取手机APP新版本信息
    var localVersion =
        Provider.of<AppVersion>(context, listen: false).appVersion;
    var resp = await _appService.fetchVersionInfo(localVersion);
    if (null == resp ||
        resp.status != 1 ||
        (resp.targetVersion!.isNotEmpty &&
            resp.targetVersion!.trim() != localVersion)) {
      _latestVersionController.text = localVersion;
      isLatest = true;
      return;
    }
    setState(() {
      _downloadUrl = resp.url!;
      _versionDescription = resp.instructions!;

      var lv = Version(localVersion);
      var rv = Version(resp.lastVersion!);
      if (rv.moreThan(lv)) {
        _latestVersionController.text = '${lv.origin} -> ${rv.origin}';
        isLatest = false;
      } else {
        _latestVersionController.text = lv.origin;
        isLatest = true;
      }
    });
  }

  // 下载进度对话框
  void _showDownloadDialog() {
    showDialog(
      // 下载对话框
      context: context,
      barrierDismissible: false, // 点击遮罩不关闭
      builder: (context) {
        return SimpleDialog(
            title: Text('更新', style: TextStyle(color: Styles.primaryColor)),
            children: <Widget>[
              Offstage(
                // 更新说明
                offstage: _versionDescription.trim() != "",
                child: Container(
                    height: 600.h,
                    child: SingleChildScrollView(
                      child: Text(_versionDescription.trim()),
                    )),
              ),
              Container(
                // 进度条
                height: 200.h,
                alignment: Alignment.centerLeft,
                padding: EdgeInsets.only(
                    left: 60.w,
                    right: 60.w),
                child: Column(
                  children: [
                    Container(
                      // 条状进度条
                      margin: EdgeInsets.symmetric(
                          horizontal: 50.w,
                          vertical: 50.h),
                      height: 25.h,
                      child: LinearProgressIndicator(
                        backgroundColor: Styles.primaryColor,
                        value: Provider.of<AppDownloadProcess>(context)
                            .process, //设置比例
                        valueColor: AlwaysStoppedAnimation<Color>(Colors.black),
                        // Navigator.of(mContext).pop(); // 下载完成关闭对话框
                      ),
                    ),
                    Text('正在为您更新，请耐心等待。'),
                  ],
                ),
              ),
            ]);
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Form(
      key: _formKey,
      child: Scaffold(
        backgroundColor: Colors.white,
        appBar: PageHead(),
        body: Container(
          padding: Styles.primaryPadding,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
              // 标题
              PageTitle(text: "关于"),
              Padding(
                padding: EdgeInsets.only(
                    top: 75.h,
                    bottom: 75.h),
                child: Text('最新应用软件版本:', style: Styles.configDescStyle),
              ),
              TextFormField(
                controller: _latestVersionController,
                readOnly: true,
                enabled: false,
                decoration: InputDecoration(
                  suffixIcon: isLatest
                      ? Icon(Icons.done,
                          color: Styles.primaryColor, size: Styles.iconSize)
                      : Icon(Icons.rotate_right,
                          color: Styles.primaryColor, size: Styles.iconSize),
                ),
              ),
              Padding(
                padding: EdgeInsets.only(top: 25.h),
                child: Text(isLatest ? '您的APP是最新的' : '有新的APP版本，点击按钮立即更新',
                    style: Styles.configDescStyle),
              ),
              // 更新按钮
              Offstage(
                offstage: isLatest,
                child: BigSButton(
                  text: '更新',
                  onPressed: () async {
                    if (Platform.isIOS) {
                      _launchToAppStore();
                    } else if (Platform.isAndroid) {
                      var hasPermission =
                          await Utils.checkPermission(Permission.storage);
                      if (hasPermission) {
                        _installApk(
                            _downloadUrl, _latestVersionController.text);
                        _showDownloadDialog();
                      } else {
                        Fluttertoast.showToast(
                            msg: "安装更新需要存储权限,该权限未打开",
                            toastLength: Toast.LENGTH_LONG,
                            gravity: ToastGravity.CENTER,
                            timeInSecForIosWeb: 3);
                      }
                    } else {
                      print('A platform witch unsupported.' +
                          Platform.operatingSystem +
                          ' ' +
                          Platform.operatingSystemVersion);
                    }
                  },
                ),
              ),
              Offstage(
                offstage: Provider.of<UserStatus>(context).userToken.isEmpty,
                child: BigSButton(
                  text: '退出登录',
                  onPressed: () {
                    States.reset(context);
                  },
                ),
              ),
              TButton(
                child: Text("用户协议和隐私政策",
                    style: TextStyle(color: Styles.linkColor)),
                onPressed: () {
                  Contact.showUserContactDialog(context);
                },
              ),
            ],
          ),
        ),
      ),
    );
  }

  /// 跳转到App Store指定页，用于IOS
  Future<Null> _launchToAppStore() async {
    // 参数为APP Store中的应用ID，对应APP Store页面 https://apps.apple.com/cn/app/XXXX/id1234
    RUpgrade.upgradeFromAppStore('id1234')
        .then((result) {
      print('install apk $result');
    }).catchError((error) {
      print('install apk error: $error');
    });
  }

  /// 下载并安装APK，用于Android
  Future<Null> _installApk(String url, String version) async {
    Directory? storageDir = await getExternalStorageDirectory();
    if (null == storageDir) {
      print('can not get storage dir');
      _showDownloadErrorDialog();
      return;
    }
    String storagePath = storageDir.path;
    String fileName = '$storagePath/lyiew_v$version.apk';

    RUpgrade.stream.listen((DownloadInfo info) { // 下载进度监听，通过状态通知更新界面进度条
      Provider.of<AppDownloadProcess>(context, listen: false).process =
          info.percent!;
    });
    RUpgrade.upgrade(url, fileName: fileName, isAutoRequestInstall: true) // 下载并安装
        .then((result) {
      print('install apk $result');
    }).catchError((error) {
      print('install apk error: $error');
    });
  }

  // 下载失败提示对话框
  void _showDownloadErrorDialog() {
    showDialog(
        context: context,
        builder: (context) {
          return SimpleDialog(
              title: Text('提示', style: TextStyle(color: Styles.primaryColor)),
              children: <Widget>[
                Container(
                  height: 200.h,
                  alignment: Alignment.centerLeft,
                  padding: EdgeInsets.only(
                      left: 60.h,
                      right: 60.h),
                  child: Text('下载失败。'),
                ),
                Divider(),
                TButton(
                    child: Text("确定",
                        style: TextStyle(fontWeight: FontWeight.w700)),
                    onPressed: () {
                      // 关闭对话框
                      Navigator.of(context).pop();
                    })
              ]);
        });
  }
}