//-----------------------------------------------------------------------------
/**静态的类 定义公用程序方法
 * The static class that defines utility methods.
 *
 * @class Utils
 */
function Utils() {
    throw new Error('This is a static class');
}

/** RPG Maker 的名称,mv 是当前版本
 * The name of the RPG Maker. 'MV' in the current version.
 *
 * @static
 * @property RPGMAKER_NAME
 * @type String
 * @final
 */
Utils.RPGMAKER_NAME = 'MV';

/**检查疑问字符串是否有(name) 测试游戏时会带
 * Checks whether the option is in the query string.
 *
 * @static
 * @method isOptionValid
 * @param {String} name The option name
 * @return {Boolean} True if the option is in the query string
 */
Utils.isOptionValid = function(name) {
    return location.search.slice(1).split('&').contains(name);
};

/**检查是不是nw.js平台
 * Checks whether the platform is NW.js.
 *
 * @static
 * @method isNwjs
 * @return {Boolean} True if the platform is NW.js
 */
Utils.isNwjs = function() {
    return typeof require === 'function' && typeof process === 'object';
};

/**检查平台是不是移动设备
 * Checks whether the platform is a mobile device.
 *
 * @static
 * @method isMobileDevice
 * @return {Boolean} True if the platform is a mobile device
 */
Utils.isMobileDevice = function() {
    var r = /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i;
    return !!navigator.userAgent.match(r);
};

/**检查浏览器是苹果
 * Checks whether the browser is Mobile Safari.
 *
 * @static
 * @method isMobileSafari
 * @return {Boolean} True if the browser is Mobile Safari
 */
Utils.isMobileSafari = function() {
    var agent = navigator.userAgent;
    return !!(agent.match(/iPhone|iPad|iPod/) && agent.match(/AppleWebKit/) &&
              !agent.match('CriOS'));
};

/**检查浏览器是安卓
 * Checks whether the browser is Android Chrome.
 *
 * @static
 * @method isAndroidChrome
 * @return {Boolean} True if the browser is Android Chrome
 */
Utils.isAndroidChrome = function() {
    var agent = navigator.userAgent;
    return !!(agent.match(/Android/) && agent.match(/Chrome/));
};

/**检查浏览器能够读文件在游戏文件夹
 * Checks whether the browser can read files in the game folder.
 *
 * @static
 * @method canReadGameFiles
 * @return {Boolean} True if the browser can read files in the game folder
 */
Utils.canReadGameFiles = function() {
    var scripts = document.getElementsByTagName('script');
    var lastScript = scripts[scripts.length - 1];
    var xhr = new XMLHttpRequest();
    try {
        xhr.open('GET', lastScript.src);
        xhr.overrideMimeType('text/javascript');
        xhr.send();
        return true;
    } catch (e) {
        return false;
    }
};

/**制作html 颜色字符串 从 rgb数值
 * Makes a CSS color string from RGB values.
 *
 * @static
 * @method rgbToCssColor
 * @param {Number} r The red value in the range (0, 255)
 * @param {Number} g The green value in the range (0, 255)
 * @param {Number} b The blue value in the range (0, 255)
 * @return {String} CSS color string
 */
Utils.rgbToCssColor = function(r, g, b) {
    r = Math.round(r);
    g = Math.round(g);
    b = Math.round(b);
    return 'rgb(' + r + ',' + g + ',' + b + ')';
};