///<reference path="../../../src/types/core.d.ts" />
'use strict';

(function () {
    /**
     * 滑动数组
     * @param {any[]} arr
     * @param {number} delta
     */
    function slide(arr, delta) {
        if (delta === 0) return arr;
        delta %= arr.length;
        if (delta > 0) {
            arr.unshift(...arr.splice(arr.length - delta, delta));
            return arr;
        }
        if (delta < 0) {
            arr.push(...arr.splice(0, -delta));
            return arr;
        }
    }

    function backDir(dir) {
        return {
            up: 'down',
            down: 'up',
            left: 'right',
            right: 'left'
        }[dir];
    }

    function has(v) {
        return v !== null && v !== void 0;
    }

    function maxGameScale(n = 0) {
        const index = core.domStyle.availableScale.indexOf(core.domStyle.scale);
        core.control.setDisplayScale(
            core.domStyle.availableScale.length - 1 - index - n
        );
        if (!core.isPlaying() && core.flags.enableHDCanvas) {
            core.domStyle.ratio = Math.max(
                window.devicePixelRatio || 1,
                core.domStyle.scale
            );
            core.resize();
        }
    }

    core.plugin.utils = {
        slide,
        backDir,
        has,
        maxGameScale
    };
})();