import * as PIXI from "pixi.js";
const { resources } = PIXI.loader;

export function isDev() {
    return (
        /^test|\.webdev2\./.test(window.location.host) ||
        window.location.port !== ""
    );
}

/**
 * 获取Url上指定参数
 * @param {String} name 参数名
 */
export function getUrlParam(name) {
    var reg = new RegExp("[?&]" + name + "=([^&#?]*)(&|#|$)");
    var r = window.location.href.match(reg);
    return r ? r[1] : null;
}

/**
 * @desc PIXI资源加载(顺序加载，避免出错)
 * @param {array} res 资源列表
 */
let loadingState = false;
let loadQueen = [];
export function loaderRes(_res, fn, context, version = false) {
    let res = [...new Set(_res)]; // 去重
    if (loadingState) {
        loadQueen.push([res, fn, context, version]);
        return;
    }
    loadingState = true;
    let loadRes = res.filter(item => resources[item] == null);
    if (loadRes.length > 0) {
        try {
            PIXI.loader.baseUrl = isDev()
                ? ""
                : `https://pub.dwstatic.com/dwgame/decibel/`;
            // PIXI.loader.defaultQueryString = version ? resVersion : "";
            PIXI.loader.add(loadRes).load(() => {
                fn.call(context);
                loadingState = false;
                loadQueen.length && loaderRes(...loadQueen.pop());
            });
        } catch (e) {
            loadingState = false;
            loadQueen.length && loaderRes(...loadQueen.pop());
        }
    } else {
        fn.call(context);
        loadingState = false;
    }
}

export function hitTestRectangle(r1, r2) {
    //Define the variables we'll need to calculate
    let hit, combinedHalfWidths, combinedHalfHeights, vx, vy;

    //hit will determine whether there's a collision
    hit = false;

    //Find the center points of each sprite
    r1.centerX = r1.x + r1.width / 2;
    r1.centerY = r1.y + r1.height / 2;
    r2.centerX = r2.x + r2.width / 2;
    r2.centerY = r2.y + r2.height / 2;

    //Find the half-widths and half-heights of each sprite
    r1.halfWidth = r1.width / 2;
    r1.halfHeight = r1.height / 2;
    r2.halfWidth = r2.width / 2;
    r2.halfHeight = r2.height / 2;

    //Calculate the distance vector between the sprites
    vx = r1.centerX - r2.centerX;
    vy = r1.centerY - r2.centerY;

    //Figure out the combined half-widths and half-heights
    combinedHalfWidths = r1.halfWidth + r2.halfWidth;
    combinedHalfHeights = r1.halfHeight + r2.halfHeight;

    //Check for a collision on the x axis
    if (Math.abs(vx) < combinedHalfWidths) {
        //A collision might be occuring. Check for a collision on the y axis
        if (Math.abs(vy) < combinedHalfHeights) {
            //There's definitely a collision happening
            hit = true;
        } else {
            //There's no collision on the y axis
            hit = false;
        }
    } else {
        //There's no collision on the x axis
        hit = false;
    }

    //`hit` will be either `true` or `false`
    return hit;
}