const os = require('os');
const fs = require("fs");
const Windows = "Windows";
const Linux = "Linux";

module.exports = {

    Windows, Linux,

    /**
     * 根据 os 不同，载入不同的方法
     */
    choise : function ( cbs ) {
        if (os.type() === 'Windows_NT') {
            // windows平台
            return cbs && cbs[ Windows ]
        }
        else if (os.type() === 'Linux') {
            // Linux平台
            return cbs && cbs[ Linux ]
        }
        else {
            throw { message : "不支持的 OS" }
        }
    },

    cur : function () {
        let isLinux = false;
        // 操作系统不同，安装方式不同
        let curOS = os.type()
        if ( curOS === "Windows_NT" ) {
            curOS = "Windows"
        }
        else if ( curOS === "Linux" ) {
            isLinux = true;
            const fs = require('fs');
            if( fs.existsSync('/etc/alpine-release') ){
                curOS = "Alpine"
            }
        }

        let curPlatform = os.arch()
        if ( curPlatform === "x64" ) {
            curPlatform = "X86_64"
        } else if ( curPlatform.startsWith("arm") ) {
            curPlatform = "ARM64"
        }

        return { isLinux, curOS, curPlatform }
    }
}