// ==UserScript==
// @name         X66 题包加载加速器
// @namespace    https://x66.local/accelerator
// @version      1.1.0
// @description  自动并发预取帧数据（含点云），写入本地缓存，大幅加速 X66 平台新包首帧加载
// @author       Bro
// @match        http://data-label-lan.gacrnd.com/*
// @match        https://data-label-lan.gacrnd.com/*
// @grant        none
// @run-at       document-start
// @noframes
// ==/UserScript==

(function () {
    'use strict';

    // ========== 配置（基于实测调优）==========
    const CFG = {
        concurrency: 6,           // 实测甜点：6 最优，>8 打爆 VPN 带宽
        maxConcurrency: 8,        // 上限
        firstBatch: 20,           // 优先预热前 20 帧（你要先看的）
        neighborRange: 10,        // 当前帧前后各 10 帧为"近邻优先级"
        waitEditorMs: 1500,       // 等待 editor 就绪轮询间隔
        maxWaitMs: 180000,        // 最多等 3 分钟
        autoDelayMs: 2500,        // 检测到新包后延迟启动（让平台先加载当前帧）
        autoStart: true,          // 自动预热
        retryFailed: true,        // 失败重试一次
    };

    const TAG = '%c[X66加速]';
    const TAGCSS = 'color:#0a9;font-weight:bold';
    const LOG = (...a) => console.log(TAG, TAGCSS, ...a);

    // ========== 状态 ==========
    const ST = {
        running: false,
        enabled: true,
        editor: null,
        OCe: null,
        total: 0,
        done: 0,
        failed: 0,
        startTime: 0,
        lastPackageKey: '',
        netProbed: false,
        netMBps: 0,
        concurrency: CFG.concurrency,
    };

    // ========== UI ==========
    let ui = null;

    function buildUI() {
        if (ui) return ui;
        const el = document.createElement('div');
        el.id = 'x66-accel-panel';
        el.style.cssText = [
            'position:fixed', 'right:16px', 'bottom:16px', 'z-index:2147483646',
            'width:258px', 'background:#fff', 'color:#1a1a1a',
            'border:1px solid #d5d5d5', 'border-radius:10px',
            'box-shadow:0 4px 18px rgba(0,0,0,.13)',
            'font:12px/1.5 -apple-system,"Segoe UI",sans-serif',
            'padding:10px 12px'
        ].join(';');

        el.innerHTML = `
          <div id="x66a-head" style="display:flex;align-items:center;justify-content:space-between;cursor:move;">
            <span style="font-weight:600;font-size:13px;">X66 加载加速</span>
            <span id="x66a-fold" style="cursor:pointer;color:#999;padding:0 3px;font-size:14px;">—</span>
          </div>
          <div id="x66a-body" style="margin-top:8px;">
            <div style="display:flex;align-items:center;justify-content:space-between;margin-bottom:7px;">
              <label style="display:flex;align-items:center;gap:5px;cursor:pointer;">
                <input id="x66a-enable" type="checkbox" checked style="margin:0;"> 自动预热
              </label>
              <span id="x66a-status" style="color:#888;font-size:11px;">待机</span>
            </div>
            <div style="background:#eee;border-radius:4px;height:6px;overflow:hidden;margin-bottom:6px;">
              <div id="x66a-bar" style="height:100%;width:0%;background:#1d9e75;transition:width .25s;"></div>
            </div>
            <div style="display:flex;justify-content:space-between;color:#777;font-size:11px;margin-bottom:8px;">
              <span id="x66a-count">0 / 0</span>
              <span id="x66a-speed"></span>
            </div>
            <div style="display:flex;gap:6px;">
              <button id="x66a-go" style="flex:1;padding:5px 0;border:1px solid #c8c8c8;background:#fafafa;border-radius:5px;cursor:pointer;font-size:12px;">立即预热</button>
              <button id="x66a-stop" style="flex:1;padding:5px 0;border:1px solid #c8c8c8;background:#fafafa;border-radius:5px;cursor:pointer;font-size:12px;">停止</button>
            </div>
            <div id="x66a-tip" style="margin-top:7px;color:#9a9a9a;font-size:11px;line-height:1.45;"></div>
          </div>
        `;
        document.body.appendChild(el);
        ui = el;

        // 拖拽
        (function drag() {
            const head = el.querySelector('#x66a-head');
            let sx = 0, sy = 0, ox = 0, oy = 0, moving = false;
            head.addEventListener('mousedown', e => {
                moving = true; sx = e.clientX; sy = e.clientY;
                const r = el.getBoundingClientRect(); ox = r.left; oy = r.top;
                e.preventDefault();
            });
            document.addEventListener('mousemove', e => {
                if (!moving) return;
                el.style.left = (ox + e.clientX - sx) + 'px';
                el.style.top = (oy + e.clientY - sy) + 'px';
                el.style.right = 'auto'; el.style.bottom = 'auto';
            });
            document.addEventListener('mouseup', () => { moving = false; });
        })();

        el.querySelector('#x66a-fold').addEventListener('click', function () {
            const b = el.querySelector('#x66a-body');
            const hidden = b.style.display === 'none';
            b.style.display = hidden ? 'block' : 'none';
            this.textContent = hidden ? '—' : '+';
        });

        el.querySelector('#x66a-enable').addEventListener('change', e => {
            ST.enabled = e.target.checked;
            setStatus(ST.enabled ? '待机' : '已禁用');
            if (!ST.enabled) stop();
        });

        el.querySelector('#x66a-go').addEventListener('click', () => {
            if (!ST.enabled) { setStatus('请先启用'); return; }
            if (ST.running) { setStatus('正在跑'); return; }
            const e = window.editor;
            if (!e || !e.state || !e.state.frames) { setStatus('页面未就绪'); return; }
            ST.editor = e;
            preheat(e).catch(err => { LOG('异常', err); setStatus('出错'); });
        });

        el.querySelector('#x66a-stop').addEventListener('click', () => {
            stop(); setStatus('已停止');
        });

        return el;
    }

    function setStatus(t) { const e = document.getElementById('x66a-status'); if (e) e.textContent = t; }
    function setTip(t) { const e = document.getElementById('x66a-tip'); if (e) e.innerHTML = t; }
    function setProgress() {
        const bar = document.getElementById('x66a-bar');
        const cnt = document.getElementById('x66a-count');
        const spd = document.getElementById('x66a-speed');
        if (!bar) return;
        bar.style.width = (ST.total ? Math.round(ST.done / ST.total * 100) : 0) + '%';
        cnt.textContent = ST.done + ' / ' + ST.total + (ST.failed ? '（失败 ' + ST.failed + '）' : '');
        if (ST.startTime && ST.done > 0) {
            const sec = (Date.now() - ST.startTime) / 1000;
            spd.textContent = (ST.done / sec).toFixed(2) + ' 帧/秒';
        }
    }

    // ========== 获取 OCe 构造器（隔离，不污染平台 loaders）==========
    function acquireLoaderCtor(editor) {
        if (ST.OCe) return ST.OCe;
        const dr = editor.dataResource;
        const st = editor.state;
        const f = st.frames[0];
        const before = dr.loaders.length;
        let L = null;
        try { L = dr.loadNext(f, true); } catch (e) { }
        // 立即还原 loaders，避免污染平台调度
        if (dr.loaders.length > before) dr.loaders.length = before;
        if (L && L.constructor && typeof L.constructor === 'function') {
            ST.OCe = L.constructor;
            LOG('loader 构造器已就绪');
            return ST.OCe;
        }
        return null;
    }

    // ========== 等待 editor 就绪 ==========
    function waitForEditor() {
        return new Promise((resolve, reject) => {
            const t0 = Date.now();
            const timer = setInterval(() => {
                const e = window.editor;
                if (e && e.dataResource && e.state && Array.isArray(e.state.frames) && e.state.frames.length) {
                    clearInterval(timer); resolve(e);
                } else if (Date.now() - t0 > CFG.maxWaitMs) {
                    clearInterval(timer); reject(new Error('等待 editor 超时'));
                }
            }, CFG.waitEditorMs);
        });
    }

    // ========== 带宽探测（决定并发）==========
    async function probeNetwork(editor) {
        if (ST.netProbed) return ST.concurrency;
        const dm = editor.dataResource.dataMap;
        const ks = Object.keys(dm).filter(k => dm[k] && dm[k].pointsUrl);
        if (ks.length < 2) { ST.netProbed = true; return ST.concurrency; }
        try {
            const urls = ks.slice(0, 2).map(k => dm[k].pointsUrl);
            const t0 = performance.now();
            const bufs = await Promise.all(urls.map(u => fetch(u).then(r => r.arrayBuffer())));
            const ms = Math.max(performance.now() - t0, 1);
            const bytes = bufs.reduce((a, b) => a + b.byteLength, 0);
            const mbps = (bytes * 8 / 1048576) / (ms / 1000);
            ST.netMBps = (bytes / 1048576) / (ms / 1000);
            // 实测：并发 6 最优；带宽很好时最多到 8
            if (mbps > 600) ST.concurrency = Math.min(8, CFG.maxConcurrency);
            else if (mbps > 200) ST.concurrency = 6;
            else if (mbps > 80) ST.concurrency = 4;
            else ST.concurrency = 3;
            ST.netProbed = true;
            LOG('带宽 ' + mbps.toFixed(0) + ' Mbps → 并发 ' + ST.concurrency);
            return ST.concurrency;
        } catch (e) {
            ST.netProbed = true;
            return ST.concurrency;
        }
    }

    // ========== 预热核心 ==========
    async function preheat(editor) {
        if (ST.running) { LOG('已在运行中'); return; }
        const dr = editor.dataResource;
        const st = editor.state;

        const OCe = acquireLoaderCtor(editor);
        if (!OCe) { LOG('无法获取 loader 构造器'); setStatus('不支持'); return; }

        const conc = await probeNetwork(editor);

        // 目标：所有未加载帧
        const unloaded = st.frames.filter(f => !dr.dataMap[f.id]);
        if (!unloaded.length) {
            LOG('已全部加载完成'); setStatus('已完整'); setProgress();
            setTip('本包帧数据已全部就绪');
            return;
        }

        // 优先级排序：当前帧近邻 → 前 N 帧 → 其余
        const cur = st.frameIndex || 0;
        const frames = st.frames;
        const idxOf = new Map(frames.map((f, i) => [f.id, i]));
        const near = [], firstN = [], rest = [];
        for (const f of unloaded) {
            const i = idxOf.get(f.id);
            if (Math.abs(i - cur) <= CFG.neighborRange) near.push(f);
            else if (i < CFG.firstBatch) firstN.push(f);
            else rest.push(f);
        }
        // 近邻按距离排序
        near.sort((a, b) => Math.abs(idxOf.get(a.id) - cur) - Math.abs(idxOf.get(b.id) - cur));
        firstN.sort((a, b) => idxOf.get(a.id) - idxOf.get(b.id));
        rest.sort((a, b) => idxOf.get(a.id) - idxOf.get(b.id));
        const targets = [...near, ...firstN, ...rest];

        ST.running = true;
        ST.total = targets.length;
        ST.done = 0; ST.failed = 0;
        ST.startTime = Date.now();
        setStatus('预热中');
        setProgress();
        LOG('开始预热 ' + targets.length + ' 帧，并发 ' + conc);

        let idx = 0;
        const worker = async () => {
            while (ST.running) {
                const i = idx++;
                if (i >= targets.length) break;
                const f = targets[i];
                if (dr.dataMap[f.id]) { ST.done++; setProgress(); continue; }
                try {
                    const L = new OCe(dr, f);   // 隔离构造，不入 dr.loaders
                    L.load();
                    await L.get();
                    ST.done++;
                } catch (e) {
                    if (CFG.retryFailed) {
                        try {
                            const L2 = new OCe(dr, f);
                            L2.load();
                            await L2.get();
                            ST.done++;
                        } catch (e2) { ST.failed++; LOG('帧失败', f.id); }
                    } else { ST.failed++; }
                }
                setProgress();
            }
        };

        await Promise.all(Array.from({ length: conc }, () => worker()));

        ST.running = false;
        const sec = ((Date.now() - ST.startTime) / 1000).toFixed(1);
        LOG('预热完成 ' + ST.done + ' 帧，失败 ' + ST.failed + '，耗时 ' + sec + 's');
        setStatus('完成');
        setTip('预热完成：' + ST.done + ' 帧 / ' + sec + 's（' + (ST.done / sec).toFixed(2) + ' 帧/秒）');
    }

    function stop() {
        ST.running = false;
        try {
            const dr = ST.editor && ST.editor.dataResource;
            if (dr && dr.loaders) dr.loaders.length = 0;
        } catch (e) { }
    }

    // ========== 自动检测新题包 ==========
    function packageKey(editor) {
        try {
            const st = editor.state;
            const f0 = st.frames[0];
            return (f0 && f0.datasetId || '') + '|' + st.frames.length + '|' + (f0 && f0.id);
        } catch (e) { return ''; }
    }

    async function autoLoop() {
        if (!/\/tool\/pc/.test(location.pathname + location.search)) return;   // 只在标注编辑器页生效

        buildUI();
        setStatus('等待题包');
        setTip('打开/领取题包后将自动预热');

        setInterval(async () => {
            if (!ST.enabled || ST.running) return;
            const e = window.editor;
            if (!e || !e.state || !Array.isArray(e.state.frames) || !e.state.frames.length) return;
            ST.editor = e;

            const key = packageKey(e);
            if (!key || key === ST.lastPackageKey) return;

            ST.lastPackageKey = key;
            ST.netProbed = false;
            const dr = e.dataResource;
            const loaded = Object.keys(dr.dataMap).length;
            const total = e.state.frames.length;
            LOG('检测到题包 ' + key + '，已加载 ' + loaded + '/' + total);

            if (loaded < total) {
                setStatus('检测到新题包');
                setTip('将在 ' + (CFG.autoDelayMs / 1000) + 's 后开始后台预热…');
                setTimeout(() => {
                    if (ST.enabled && !ST.running) {
                        preheat(e).catch(err => LOG('预热异常', err));
                    }
                }, CFG.autoDelayMs);
            } else {
                setStatus('已完整');
            }
        }, CFG.waitEditorMs * 2);
    }

    // ========== 启动 ==========
    function boot() {
        LOG('v1.1.0 已注入');
        const start = () => { waitForEditor().then(() => autoLoop()).catch(() => autoLoop()); };
        if (document.readyState === 'loading') {
            document.addEventListener('DOMContentLoaded', start);
        } else {
            start();
        }
    }

    boot();
})();