import 'dart:convert';
import 'dart:io';

import 'package:chat/data/UserData.dart';
import 'package:chat/data/constants.dart';
import 'package:chat/data/group_data_mgr.dart';
import 'package:chat/generated/i18n.dart';
import 'package:chat/home/qr_scanner_overlay.dart';
import 'package:chat/utils/CustomUI.dart';
import 'package:chat/utils/MessageMgr.dart';
import 'package:chat/utils/app_navigator.dart';
import 'package:flutter/material.dart';
import 'package:flutter_qr_reader/flutter_qr_reader.dart';
import 'package:flutter_qr_reader/qrcode_reader_view.dart';
import 'package:image_picker/image_picker.dart';
import 'package:oktoast/oktoast.dart';
import 'package:url_launcher/url_launcher.dart';

import 'join_group_confirm.dart';

class QrScannerPage extends StatefulWidget {
  @override
  _QrScannerPageState createState() => _QrScannerPageState();
}

class _QrScannerPageState extends State<QrScannerPage>
    with SingleTickerProviderStateMixin {
  String scanImgPath;
  GlobalKey<QrcodeReaderViewState> qrViewKey = GlobalKey();

  AnimationController _animationController;
  Animation _animation;
  QrReaderViewController qrReaderViewController;
  @override
  void initState() {
    super.initState();

    _animationController = new AnimationController(
        duration: Duration(milliseconds: 600), vsync: this);

    _animation = Tween(begin: 1.0, end: 0.45).animate(_animationController)
      ..addListener(() {
        //这行如果不写，没有动画效果
        setState(() {});
      });

    _animationController.forward();
  }

  bool isScan = false;

  @override
  void dispose() {
    qrReaderViewController = null;
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final Size size = MediaQuery.of(context).size;
    final double scanWidth = 250;
    final double borderWidth = 5;
    final screenRect = Rect.fromLTWH(
      size.width / 2 - scanWidth / 2 + borderWidth,
      size.height / 2 -
          scanWidth / 2 +
          borderWidth -
          kBottomNavigationBarHeight,
      scanWidth - 2 * borderWidth,
      scanWidth - 2 * borderWidth,
    );

    return Scaffold(
      appBar: AppBar(
        leading: IconButton(
          iconSize: 22,
          icon: Icon(
            Icons.arrow_back_ios,
            color: Colors.white,
          ),
          onPressed: () {
            Navigator.of(context).pop();
          },
        ),
        backgroundColor: Colors.black,
        title: Text(I18n.of(context).scan,
            textScaleFactor: 1.0, style: TextStyle(color: Colors.white)),
        centerTitle: true,
      ),
      backgroundColor: Colors.black.withOpacity(_animation.value),
      body: ScanImageView(
          scanColor: Colors.blueAccent,
          scanRect: screenRect,
          child: Stack(
            alignment: Alignment.center,
            children: <Widget>[
              scanImgPath == null
                  ? QrReaderView(
                      width: size.width,
                      height: size.height,
                      callback: (container) {
                        qrReaderViewController = container;

                        Future.delayed(Duration(milliseconds: 600), () {
                          qrReaderViewController.startCamera(onQrBack);
                        });
                      },
                    )
                  : SizedBox.expand(
                      child: Image.file(
                      File(scanImgPath),
                      fit: BoxFit.contain,
                    )),
              Positioned(
                  left: 0,
                  right: 0,
                  bottom: 0,
                  child: Container(
                    color: Colors.black,
                    padding: EdgeInsets.symmetric(vertical: 10),
                    child: Row(
                      mainAxisAlignment: MainAxisAlignment.spaceAround,
                      children: <Widget>[
                        _iconButton(
                            IconData(0xe658,
                                fontFamily: Constants.IconFontFamily),
                            I18n.of(context).my_qr, () {
                          AppNavigator.pushQrPage(context);
                        }),
                        _iconButton(
                            IconData(0xe626,
                                fontFamily: Constants.IconFontFamily),
                            I18n.of(context).picture, () async {
                          if (await CustomUI.showPhotoPermissionSetting(
                              context)) {
                            _scanImage();
                          }
                        })
                      ],
                    ),
                  ))
            ],
          )),
    );
  }

  Future _scanImage() async {
    stopScan();

    print('_scanImage 开始');

    var image = await ImagePicker.pickImage(source: ImageSource.gallery);
    if (image == null) {
      startScan();
      return;
    }
    setState(() {
      scanImgPath = image.path;
    });
    final rest = await FlutterQrReader.imgScan(image);

    print('_scanImage $rest');

    onScan(rest);
  }

  void startScan() {
    isScan = false;
    qrReaderViewController.startCamera(onQrBack);
  }

  void stopScan() {
    qrReaderViewController.stopCamera();
  }

  onScan(String result) {
    if (result == null || result.length == 0) {
      return;
    }
    print('扫描 $result');
    stopScan();
    Navigator.of(context).pop();

    if (result.startsWith('https://henho.jphgames.com/')) {
      result = result.replaceFirst('https://henho.jphgames.com/?', '');
      result = utf8.decode(base64Decode(result));
      result = 'https://henho.jphgames.com/?' + result;
      var url = Uri.parse(result);
      var type = int.parse(url.queryParameters['type']);

      int expirationTime = int.parse(url.queryParameters['expirationTime']);
      int curTime = DateTime.now().millisecondsSinceEpoch;
      print('过期时间$expirationTime');

      if (curTime > expirationTime) {
        showToast(I18n.of(context).qr_outtime);
        return;
      }
      if (type == 1) {
        var targetId = int.parse(url.queryParameters['sessionId']);
        //群二维码
        print('群二维码');
        GroupInfoMgr().getGroupInfo(targetId, isSave: false).then((groupInfo) {
          print('--------------------');
          print(groupInfo);
          if (groupInfo == null) {
            showToast(I18n.of(context).no_goupr_info);
            return;
          }
          Navigator.push(Constants.getCurrentContext(),
              MaterialPageRoute<void>(builder: (BuildContext context) {
            return JoinGroupConfirmPage(
              groupInfoModel: groupInfo,
            );
          }));
        });
      } else {
        //个人二维码
        print('个人二维码');

        var targetId = int.parse(url.queryParameters['sessionId']);
        if (targetId == UserData().basicInfo.userId) {
          //我的页面
          MessageMgr().emit('Show My Profile');
        } else {
          AppNavigator.pushProfileInfoPage(context, targetId, addMode: 1);
        }
      }
    } else {
      //其他的条码
      launch(result);
    }
  }

  onQrBack(String result, List<Offset> points) {
    print('扫描结果 $result');

    if (isScan == true) return;
    isScan = true;
    stopScan();
    onScan(result);
  }

  Widget _iconButton(IconData code, String iconName, Function onTap) {
    return InkWell(
        onTap: onTap,
        child: Container(
            child: Column(children: <Widget>[
          Icon(
            code,
            size: 30,
            color: Colors.white,
          ),
          SizedBox(height: 5),
          Text(
            iconName,
            textScaleFactor: 1.0,
            style: TextStyle(color: Colors.white),
          )
        ])));
  }
}