import 'dart:io';

import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart' hide Response;
import 'package:install_plugin/install_plugin.dart';
import 'package:news_getx/data/model/app.dart';
import 'package:news_getx/data/repository/app_repository.dart';
import 'package:news_getx/data/services/config.dart';
import 'package:news_getx/modules/widgets/toast.dart';
import 'package:news_getx/utils/http.dart';
import 'package:path_provider/path_provider.dart';

class DownloadController extends GetxController {
  // 进度条
  var _progressValue = 0.0.obs;

  double get progressValue => _progressValue.value;

  set progressValue(double value) {
    _progressValue.value = value;
  }

  Future<Response> download(String fileUrl, String fullPath) async {
    progressValue = 0;
    return await HttpUtil().dio.download(
      fileUrl,
      fullPath,
      options: Options(
        receiveTimeout: Duration(minutes: 5),
      ),
      onReceiveProgress: (count, total) {
        final value = count / total;
        if (progressValue != value) {
          if (progressValue < 1.0) {
            progressValue = count / total;
          } else {
            progressValue = 0.0;
          }
        }
      },
    );
  }
}

/// App 更新
class AppUpdateUtil {
  static AppUpdateUtil _instance = AppUpdateUtil._internal();

  factory AppUpdateUtil() => _instance;

  AppUpdateUtil._internal();

  AppUpdateResponse? _appUpdateInfo;

  /// 获取更新信息
  Future run() async {
    // 提交 设备类型、发行渠道、架构、机型
    AppUpdateRequest appUpdateRequest = AppUpdateRequest(
      device: Platform.isIOS ? "ios" : "android",
      channel: ConfigService.channel,
      architecture: ConfigService.isIOS
          ? ConfigService.iosDeviceInfo!.utsname.machine
          : ConfigService.androidDeviceInfo!.device,
      model: ConfigService.isIOS
          ? ConfigService.iosDeviceInfo!.name
          : ConfigService.androidDeviceInfo!.brand,
    );

    _appUpdateInfo = await AppRepository().update(appUpdateRequest);

    _runAppUpdate();
  }

  /// 检查是否有新版
  Future<void> _runAppUpdate() async {
    // 比较版本
    final isNewVersion =
        _appUpdateInfo!.latestVersion!.compareTo(ConfigService.to.version) > 0;

    // 发现新版本
    if (isNewVersion) {
      _appUpdateConformDialog(() {
        Get.back(); // 手动关闭对话框
        if (ConfigService.isIOS) {
          // 前往AppStore
          InstallPlugin.gotoAppStore(_appUpdateInfo!.shopUrl!);
        } else {
          // 下载APK
          toastInfo(msg: "开始下载升级包");
          _downloadAPKAndSetup(
              _appUpdateInfo!.fileUrl!, _appUpdateInfo!.latestVersion!);
        }
      });
    }
  }

  /// 下载文件 & 安装
  Future<void> _downloadAPKAndSetup(String fileUrl, String version) async {
    // 下载
    Directory? externalDir = await getExternalStorageDirectory();

    if (externalDir == null) {
      toastInfo(msg: "获取文件夹信息失败");
      return;
    }

    String filename = "release-{$version}.apk";
    // 存储路径
    String fullPath = "${externalDir.path}/$filename";
    bool isFileFound = false;

    final files = externalDir.listSync();
    for (FileSystemEntity file in files) {
      if (file is File && file.path.endsWith(filename)) {
        isFileFound = true;
        break;
      }
    }
    if (!isFileFound) {
      final DownloadController downloadController = Get.put(
          DownloadController());
      Get.dialog(
        AlertDialog(
          title: Text('文件下载中'),
          content: Obx(() {
            final percentage = downloadController.progressValue * 100;

            if (percentage == 100) {
              Get.back();
            }

            return Row(
              children: [
                Text('正在下载'),
                Expanded(child: LinearProgressIndicator(
                    value: downloadController.progressValue)),
                Text(
                    "${percentage.toStringAsFixed(0)}%"),
              ],
            );
          }),
        ),
        barrierDismissible: false,
      );
      await downloadController.download(fileUrl, fullPath);
    }
    // 安装
    await InstallPlugin.installApk(fullPath);
  }

  /// 升级确认对话框
  void _appUpdateConformDialog(VoidCallback onPressed) {
    Get.dialog(
      AlertDialog(
        title: Text('发现新版本 ${_appUpdateInfo!.latestVersion}'),
        content: Text(_appUpdateInfo!.latestDescription ?? ''),
        actions: [
          TextButton(
            child: Text('取消'),
            onPressed: () {
              Get.back(); // 手动关闭对话框
            },
          ),
          ElevatedButton(
            onPressed: onPressed,
            child: Text('同意'),
          ),
        ],
      ),
    );
  }
}