// ==UserScript==
// @name         通用视频助手
// @version      1.0
// @description  鼠标滚轮控制视频前进/后退，默认4秒，可自己设定。中键加速+0.1，记忆每个视频的播放时间点，再次播放时自动跳转。设置视频默认播放速度1.0，可以自己设定
// @author       编码助手
// @match        *://*/*
// @grant        none
// @run-at       document-start
// @namespace https://greasyfork.org/users/325179
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    const JUMP_STEP = 4;
    const DEFAULT_SPEED = 1.0;

    // 1. 样式：提示文字在父级容器内绝对居中
    const style = document.createElement('style');
    style.innerHTML = `
        .v-helper-container {
            position: absolute; inset: 0; display: flex;
            align-items: center; justify-content: center;
            pointer-events: none; z-index: 2147483647;
        }
        .v-helper-tip {
            background: rgba(0, 0, 0, 0.85); color: #00ffcc;
            padding: 15px 32px; border-radius: 12px;
            font-size: 34px; font-weight: bold; opacity: 0;
            box-shadow: 0 0 25px rgba(0,0,0,0.7);
        }
        .v-animate { animation: v-popup 0.6s ease-out forwards; }
        @keyframes v-popup {
            0% { opacity: 0; transform: scale(0.4); }
            15% { opacity: 1; transform: scale(1.1); }
            85% { opacity: 1; transform: scale(1.05); }
            100% { opacity: 0; transform: scale(1); }
        }
    `;
    document.head.appendChild(style);

    const containerEl = document.createElement('div');
    containerEl.className = 'v-helper-container';
    const tipEl = document.createElement('div');
    tipEl.className = 'v-helper-tip';
    containerEl.appendChild(tipEl);

    // 获取当前视频的唯一特征 (URL + 时长 + 视频源)
    function getFingerprint(video) {
        if (!video || isNaN(video.duration)) return null;
        const duration = Math.floor(video.duration);
        // 使用 video.src 是最稳妥的，视频一换，src 必换
        const raw = `${window.location.pathname}${duration}${video.src.substring(0, 50)}`;
        return 'v_id_' + btoa(encodeURIComponent(raw)).substring(0, 40);
    }

    // --- 核心逻辑：处理视频状态切换 ---
    function checkVideoState() {
        // 使用你提供的 YouTube 专属路径
        const v = document.querySelector("#movie_player > div.html5-video-container > video") ||
                  document.querySelector('video');

        if (!v || isNaN(v.duration)) return;

        const currentFp = getFingerprint(v);

        // 如果指纹变了，说明切换了视频（即使在同一个网页内）
        if (v.dataset.lastFp !== currentFp) {
            console.log("[编码助手] 检测到视频源切换，正在应用设置...");

            v.dataset.lastFp = currentFp;

            // 1. 恢复记忆进度
            const savedTime = localStorage.getItem(currentFp);
            if (savedTime) {
                const time = parseFloat(savedTime);
                if (time > 5 && time < v.duration - 10) {
                    v.currentTime = time;
                }
            }

            // 2. 强制设置倍速与播放
            v.playbackRate = DEFAULT_SPEED;
            v.play().catch(() => { v.muted = true; v.play(); });

            // 3. 确保绑定了进度记录器 (仅绑定一次)
            if (!v.dataset.saveBound) {
                v.addEventListener('timeupdate', () => {
                    const fp = getFingerprint(v);
                    if (fp && v.currentTime > 5 && v.currentTime < v.duration - 5) {
                        localStorage.setItem(fp, v.currentTime);
                    }
                });
                v.dataset.saveBound = "true";
            }
        }
    }

    // --- 视觉提示显示 ---
    function showTip(v, text) {
        // 优先挂载到 YouTube 的主播放器容器
        const mountPoint = document.querySelector('#movie_player') || v.parentElement;
        if (!mountPoint) return;

        if (containerEl.parentNode !== mountPoint) {
            mountPoint.style.position = mountPoint.style.position || 'relative';
            mountPoint.appendChild(containerEl);
        }
        tipEl.innerText = text;
        tipEl.classList.remove('v-animate');
        void tipEl.offsetWidth;
        tipEl.classList.add('v-animate');
    }

    // --- 全局事件拦截 ---
    const eventHandler = (e) => {
        const v = document.querySelector("#movie_player > div.html5-video-container > video") ||
                  document.querySelector('video');
        if (!v) return;

        // 只要鼠标在播放器容器内
        const player = document.querySelector('#movie_player') || v.closest('.html5-video-player') || v;
        const r = player.getBoundingClientRect();
        if (e.clientX >= r.left && e.clientX <= r.right && e.clientY >= r.top && e.clientY <= r.bottom) {

            if (e.type === 'wheel') {
                e.preventDefault();
                e.stopImmediatePropagation();
                const forward = e.deltaY > 0; // 下滚前进
                v.currentTime += forward ? JUMP_STEP : -JUMP_STEP;
                showTip(v, (forward ? '>> ' : '<< ') + JUMP_STEP + 's');
            }
            else if (e.type === 'mousedown' && e.button === 1) {
                e.preventDefault();
                e.stopImmediatePropagation();
                v.playbackRate = (parseFloat(v.playbackRate) + 0.1).toFixed(1);
                showTip(v, `${v.playbackRate}x`);
            }
        }
    };

    window.addEventListener('wheel', eventHandler, { passive: false, capture: true });
    window.addEventListener('mousedown', eventHandler, { capture: true });
    window.addEventListener('auxclick', e => e.button === 1 && e.preventDefault(), { capture: true });

    // 轮询检查（关键：每秒检查指纹是否变化）
    setInterval(checkVideoState, 1000);

})();