import 'dart:math';

import 'package:flutter/services.dart';

class VersionUtils {
  static const MethodChannel _kChannel = MethodChannel('version');

  /// 应用安装
  static void install(String path) {
    _kChannel.invokeMethod<void>('install', {'path': path});
  }

  /// AppStore跳转
  static void jumpAppStore() {
    _kChannel.invokeMethod<void>('jumpAppStore');
  }

  static bool compareVersion(curV, reqV) {
    if (curV != null && reqV != null) {
      //将两个版本号拆成数字
      var arr1 = curV.split('.'), arr2 = reqV.split('.');
      int arr1Len = arr1.length;
      int arr2Len = arr2.length;
      int minLength = min(arr1Len, arr2Len), position = 0, diff = 0;
      // 依次比较版本号每一位大小，当对比得出结果后跳出循环（后文有简单介绍）
      while (position < minLength &&
          ((diff = int.parse(arr1[position]) - int.parse(arr2[position])) ==
              0)) {
        position++;
      }
      diff = (diff != 0) ? diff : (arr1.length - arr2.length);
      //若curV大于reqV，则返回true
      return diff > 0;
    } else {
      //输入为空
      return false;
    }
  }
}