'use strict';

const os = require('os');

const execa = require('execa');

// Reference: https://www.gaijin.at/en/lstwinver.php

const names = new Map([

['10.0', '10'],

['6.3', '8.1'],

['6.2', '8'],

['6.1', '7'],

['6.0', 'Vista'],

['5.2', 'Server 2003'],

['5.1', 'XP'],

['5.0', '2000'],

['4.9', 'ME'],

['4.1', '98'],

['4.0', '95']

]);

const windowsRelease = release => {

const version = /\d+\.\d/.exec(release || os.release());

if (release && !version) {

throw new Error('`release` argument doesn\'t match `n.n`');

}

const ver = (version || [])[0];

// Server 2008, 2012 and 2016 versions are ambiguous with desktop versions and must be detected at runtime.

// If `release` is omitted or we're on a Windows system, and the version number is an ambiguous version

// then use `wmic` to get the OS caption: https://msdn.microsoft.com/en-us/library/aa394531(v=vs.85).aspx

// If the resulting caption contains the year 2008, 2012 or 2016, it is a server version, so return a server OS name.

if ((!release || release === os.release()) && ['6.1', '6.2', '6.3', '10.0'].includes(ver)) {

const stdout = execa.sync('wmic', ['os', 'get', 'Caption']).stdout || '';

const year = (stdout.match(/2008|2012|2016/) || [])[0];

if (year) {

return `Server ${year}`;

}

}

return names.get(ver);

};

module.exports = windowsRelease;