// ==UserScript==
// @name         哔哩哔哩视频页面常驻显示AV/BV号
// @namespace    https://www.ckylin.site/
// @version      0.6
// @description  始终在哔哩哔哩视频页面标题下方显示当前视频号，默认显示AV号，右键切换为BV号，单击弹窗可复制链接
// @author       CKylinMC
// @match        https://www.bilibili.com/video*
// @grant        unsafeWindow
// @require https://greasyfork.org/scripts/405344-ckautoloader/code/CKAutoLoader.js?version=816331
// @license      GPLv3 License
// @downloadURL none
// ==/UserScript==

(function(){
window.blblsavInited = false;
window.bilibiliShowAV = function () {
    //if(!window.blblsavInited) return false;
    //if (!'aid' in window) return false;
    window.CK_avid = location.href.split("/video/")[1].split("/?")[0].split("/")[0].split("?")[0].split("#")[0];
    if(window.CK_avid.toLowerCase().indexOf("bv")==0){
        window.CK_avid = window.CK_bv2av(window.CK_avid)+"";
        if(window.CK_avid.toLowerCase().indexOf("av")==-1){
            window.CK_avid = "av"+window.CK_avid;
        }
    }
    var av_root = document.querySelector(".video-data");
    if (!av_root) return false;
    var av_span = document.querySelector("#bilibiliShowAV");
    if(!av_span) {
        av_span = document.createElement("span");
        av_span.id = "bilibiliShowAV";
        av_span.style.marginLeft = "16px";
        av_root.appendChild(av_span);
    }
    av_span.innerText = window.CK_avid;
    av_span.onclick = function(e){prompt("当前视频地址：", "https://www.bilibili.com/video/"+e.target.innerText)};
    av_span.oncontextmenu = function(e){
        if (e.target.innerText == window.CK_avid) {
            e.target.innerText = window.CK_av2bv(window.CK_avid);
        } else {
            e.target.innerText = window.CK_avid;
        }
        return false;
    }
    return true;
}
window.CK_bv2av = function(x){
    // 修改自：https://www.v2ex.com/t/655569
    var table = "fZodR9XQDSUm21yCkr6zBqiveYah8bt4xsWpHnJE7jL5VG3guMTKNPAwcF",
        tr = new Object();
    for (var i = 0; i < 58; i++) {
        tr[table[i]] = i;
    }
    var s = [11, 10, 3, 8, 4, 6],
        xor = 177451812,
        add = 8728348608;
    var r = 0;
    for (var i = 0; i < 6; i++) {
        r += tr[x[s[i]]] * 58 ** i;
    }
    return (r - add) ^ xor;
}
window.CK_av2bv = function(x){
    // 修改自：https://www.v2ex.com/t/655569
    var table = "fZodR9XQDSUm21yCkr6zBqiveYah8bt4xsWpHnJE7jL5VG3guMTKNPAwcF",
        tr = new Object();
    for (var i = 0; i < 58; i++) {
        tr[table[i]] = i;
    }
    var s = [11, 10, 3, 8, 4, 6],
        xor = 177451812,
        add = 8728348608;
    var r = 0;
    x = (x ^ xor) + add;
    r = "BV1  4 1 7  ".split("");
    for (var i = 0; i < 6; i++) {
        r[s[i]] = table[Math.floor(x / 58 ** i) % 58];
    }
    return r.join("");
}
window.CK_ShowAV_detecter = function (){
	setTimeout(function(){
		window.blblsavInited = true;
		window.bilibiliShowAV();
		window.lastHref = location.href;
		setInterval(function(){if(window.lastHref!=location.href){window.lastHref=location.href;window.bilibiliShowAV();}},1000);

	},500);
}

window.CKAutoLoader.reg("ShowAV",window.CK_ShowAV_detecter);

})()