// ==UserScript==
// @name         哔哩哔哩视频页面常驻显示AV/BV号[已完全重构，支持显示分P标题]
// @namespace    ckylin-bilibili-display-video-id
// @version      1.1
// @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
// @license      GPLv3 License
// @downloadURL none
// ==/UserScript==

(function () {
    const wait = (t) => { return new Promise(r => setTimeout(r, t)); }
    const log = (...m) => console.log('[ShowAV]', ...m);
    let infos = {};
    function videoInitInfoHandler(e) {
        if (e.data.command && e.data.pageData && e.data.command == "sendInitData") {
            infos = e.data.pageData;
            tryInject();
        }
    }
    async function playerReady() {
        let i = 50;
        while (--i >= 0) {
            await wait(100);
            if (!('player' in unsafeWindow)) continue;
            if (!('isInitialized' in unsafeWindow.player)) continue;
            if (!unsafeWindow.player.isInitialized()) continue;
            return true;
        }
        return false;
    }
    async function waitForDom(q) {
        let i = 50;
        let dom;
        while (--i >= 0) {
            if (dom = document.querySelector(q)) break;
            await wait(100);
        }
        return dom;
    }
    function getUrlParam(key) {
        return (new URL(location.href)).searchParams.get(key);
    }
    function getOrNew(id, parent) {
        let target = document.querySelector("#" + id);
        if (!target) {
            target = document.createElement("span");
            target.id = id;
            target.style.marginLeft = "16px";
            parent.appendChild(target);
        }
        return target;
    }
    async function getPlayerSeeks() {
        const video = await waitForDom(".bilibili-player-video video");
        let seconds = 0;
        if (video) {
            seconds = Math.floor(video.currentTime);
        }
        if (seconds == 0) {
            let fromParam = getUrlParam("t") || 0;
            return fromParam;
        } else return seconds;
    }
    async function tryInject() {
        log("Been called");
        if (!(await playerReady())) return log('Can not load player in time.');

        const av_root = await waitForDom(".video-data");
        if (!av_root) return log('Can not load info-bar in time.');

        const av_span = getOrNew("bilibiliShowAV", av_root);
        av_span.innerText = 'av' + infos.aid;
        av_span.oncontextmenu = e => {
            if (e.target.innerText.startsWith('av')) e.target.innerText = infos.bvid;
            else av_span.innerText = 'av' + infos.aid;
            e.preventDefault();
        }
        av_span.onclick = async e => {
            let url = new URL(location.protocol + "//" + location.hostname + location.pathname);
            infos.p == 1 || url.searchParams.append("p", infos.p);
            let t = await getPlayerSeeks();
            if (t && t != "0") url.searchParams.append("t", t);
            prompt("当前视频地址：", url);
        }
        const videoData = infos.videoData;
        if (!videoData) return;
        let part = { part: 'P' + infos.p }
        try {
            part = videoData.pages[infos.p - 1];
        } catch (e) {
            part = videoData.pages[0];
        }
        const pn_span = getOrNew("bilibiliShowPN", av_root);
        const currentPageNum = `P ${infos.p}/${videoData.videos}`;
        const currentPageName = `《${part.part}》`
        pn_span.style.textOverflow = "ellipsis";
        pn_span.style.whiteSpace = "nowarp";
        pn_span.style.overflow = "hidden";
        pn_span.title = currentPageNum + "\n" + currentPageName
        pn_span.innerText = currentPageNum + " " + currentPageName;
    }
    unsafeWindow.addEventListener("message", videoInitInfoHandler);
})();