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

import '../utils/global.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'event_bus_util.dart';

class PermissionUtil {
  static var deniedSets = Set();

  static Permission getLocationPermission() {
    if (Platform.isAndroid) {
      //获取系统版本
      if (Global.androidSDK != null && Global.androidSDK! < 29) {
        return Permission.locationAlways;
      } else {
        return Permission.location;
      }
    } else {
      return Permission.locationAlways;
    }
  }

  static Future _loadDeniedPermissions() async {
    //加载
    SharedPreferences prefs = await SharedPreferences.getInstance();
    List<String>? list = prefs.getStringList("permission_delay_list");
    deniedSets.clear();
    if (list != null) {
      deniedSets.addAll(list);
    }

    print(jsonEncode(list));
  }

  static Future _denyPermission(Permission permission) async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    List<String>? list = prefs.getStringList("permission_delay_list");
    list ??= [];
    bool hasAdd = false;
    list.forEach((element) {
      if (element == permission.value.toString()) {
        hasAdd = true;
      }
    });

    if (!hasAdd) {
      list.add(permission.value.toString());
    }
    await prefs.setStringList("permission_delay_list", list);
  }

  static Future _removeDenyPermission(Permission permission) async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    List<String>? list = prefs.getStringList("permission_delay_list");
    list ??= [];

    for (int i = 0; i < list.length; i++) {
      if (list[i] == permission.value.toString()) {
        list.removeAt(i);
        i--;
      }
    }
    await prefs.setStringList("permission_delay_list", list);
  }

  ///打开应用设置
  static openAppSetting() async {
    await openAppSettings();
  }

  ///打开权限,
  ///force：强制打开，权限被拒绝后记录
  static Future<PermissionStatus> openPermission(Permission permission,
      {force: false}) async {
    await _loadDeniedPermissions();
    PermissionStatus status = await permission.status;
    PermissionStatus? resultStatus;
    switch (status) {
      //Android授权
      case PermissionStatus.granted:
        resultStatus = status;
        break;
      //Android拒绝
      case PermissionStatus.denied:
        if (deniedSets.contains(permission.value.toString()) && !force) {
          resultStatus = PermissionStatus.denied;
        } else {
          resultStatus = await permission.request();
        }
        break;
      //Android禁止后不再提示
      case PermissionStatus.permanentlyDenied:
        if (deniedSets.contains(permission.value.toString()) && !force) {
          resultStatus = PermissionStatus.permanentlyDenied;
        } else {
          bool success = await openAppSettings();
          resultStatus = await permission.status;
        }
        break;
      //IOS
      case PermissionStatus.limited:
        if (deniedSets.contains(permission.value.toString()) && !force) {
          resultStatus = PermissionStatus.limited;
        } else {
          resultStatus = await permission.request();
        }
        break;
      //IOS
      case PermissionStatus.restricted:
        if (deniedSets.contains(permission.value.toString()) && !force) {
          resultStatus = PermissionStatus.restricted;
        } else {
          resultStatus = await permission.request();
        }
        break;
    }

    if (resultStatus == PermissionStatus.granted) {
      _removeDenyPermission(permission);
    } else {
      _denyPermission(permission);
    }

    return resultStatus;
  }

  ///批量打开权限
  static openPermissions(List<Permission> permissions, {force: true}) async {
    await _loadDeniedPermissions();
    List<Permission> requestPS = [];
    permissions.forEach((element) {
      if (!deniedSets.contains(element.value.toString())) {
        requestPS.add(element);
      }
    });

    if (requestPS.isNotEmpty) {
      await requestPS.request();
    }
  }

  ///关闭权限
  static Future<PermissionStatus> closePermission(Permission permission) async {
    bool success = await openAppSettings();
    return await permission.status;
  }
}