// ==UserScript==
// @name         通用 HTML5 视频倍速自定义 (长按右方向键3倍速)
// @version      1.0
// @description  支持全网所有现代HTML5视频播放器。长按右方向键3倍速（不快进），松开恢复。
// @author       Longlone & Gemini
// @license      MIT
// @match        *://*/*
// @grant        none
// @namespace https://greasyfork.org/users/1548979
// @downloadURL https://update.greasyfork.icu/scripts/575988/%E9%80%9A%E7%94%A8%20HTML5%20%E8%A7%86%E9%A2%91%E5%80%8D%E9%80%9F%E8%87%AA%E5%AE%9A%E4%B9%89%20%28%E9%95%BF%E6%8C%89%E5%8F%B3%E6%96%B9%E5%90%91%E9%94%AE3%E5%80%8D%E9%80%9F%29.user.js
// @updateURL https://update.greasyfork.icu/scripts/575988/%E9%80%9A%E7%94%A8%20HTML5%20%E8%A7%86%E9%A2%91%E5%80%8D%E9%80%9F%E8%87%AA%E5%AE%9A%E4%B9%89%20%28%E9%95%BF%E6%8C%89%E5%8F%B3%E6%96%B9%E5%90%91%E9%94%AE3%E5%80%8D%E9%80%9F%29.meta.js
// ==/UserScript==

(function () {
    'use strict';

    // ==========================================
    // 核心逻辑变量
    // ==========================================
    let pressTimer = null;      // 计时器ID
    let isLongPressing = false; // 是否处于长按状态标记
    let savedSpeed = 1;         // 保存长按前的速度
    let LONG_PRESS_DELAY = 220; // 长按判定时间(毫秒)，可按需微调

    // ==========================================
    // 动态寻找当前页面主要的 video 元素
    // ==========================================
    function getActiveVideo() {
        const videos = Array.from(document.querySelectorAll('video'));
        if (videos.length === 0) return null;
        if (videos.length === 1) return videos[0];

        let playingVideo = videos.find(v => !v.paused && v.readyState > 2);
        if (playingVideo) return playingVideo;

        return videos.sort((a, b) => (b.clientWidth * b.clientHeight) - (a.clientWidth * a.clientHeight))[0];
    }

    // ==========================================
    // 判断用户是否正在输入框中打字 (防误触)
    // ==========================================
    function isTyping(e) {
        const target = e.target;
        const tagName = target.tagName.toUpperCase();
        return tagName === 'INPUT' || tagName === 'TEXTAREA' || target.isContentEditable;
    }

    // ==========================================
    // 视觉指示器逻辑 (UI)
    // ==========================================
    function getOrCreateIndicator(videoDom) {
        const container = videoDom.parentElement;
        if (!container) return null;

        // 确保父容器可以作为 absolute 元素的定位参考系
        const computedStyle = window.getComputedStyle(container);
        if (computedStyle.position === 'static') {
            container.style.position = 'relative';
        }

        let indicator = container.querySelector('.speed-indicator-gemini-v3');
        if (!indicator) {
            indicator = document.createElement('div');
            indicator.className = 'speed-indicator-gemini-v3';
            Object.assign(indicator.style, {
                position: 'absolute',
                top: '10%',
                left: '50%',
                transform: 'translateX(-50%)',
                padding: '10px 20px',
                backgroundColor: 'rgba(0, 0, 0, 0.75)',
                color: 'white',
                borderRadius: '8px',
                fontSize: '18px',
                fontWeight: 'bold',
                zIndex: '999999',
                opacity: '0',
                transition: 'opacity 0.2s ease-in-out',
                pointerEvents: 'none',
                display: 'flex',
                alignItems: 'center',
                gap: '8px',
                letterSpacing: '2px'
            });
            indicator.innerHTML = '<span>▶▶▶</span>';
            container.appendChild(indicator);
        }
        return indicator;
    }

    function toggleIndicator(videoDom, show) {
        const indicator = getOrCreateIndicator(videoDom);
        if (indicator) {
            indicator.style.opacity = show ? '1' : '0';
        }
    }

    // ==========================================
    // 按下键盘逻辑
    // ==========================================
    window.addEventListener('keydown', (e) => {
        if (isTyping(e)) return;
        if (e.code !== 'ArrowRight') return;

        const videoDom = getActiveVideo();
        if (!videoDom) return;

        // 阻止原生快进
        e.preventDefault();
        e.stopPropagation();

        if (isLongPressing || e.repeat) return;

        if (!pressTimer) {
            savedSpeed = videoDom.playbackRate;
            pressTimer = setTimeout(() => {
                isLongPressing = true;
                videoDom.playbackRate = 3.0;

                // 触发长按时，显示 UI 指示器
                toggleIndicator(videoDom, true);
            }, LONG_PRESS_DELAY);
        }
    }, true);

    // ==========================================
    // 松开键盘逻辑
    // ==========================================
    window.addEventListener('keyup', (e) => {
        if (isTyping(e)) return;
        if (e.code !== 'ArrowRight') return;

        const videoDom = getActiveVideo();
        if (!videoDom) return;

        e.preventDefault();
        e.stopPropagation();

        if (pressTimer) {
            clearTimeout(pressTimer);
            pressTimer = null;
        }

        if (isLongPressing) {
            // 松手时，恢复速度，隐藏 UI 指示器
            videoDom.playbackRate = savedSpeed;
            isLongPressing = false;
            toggleIndicator(videoDom, false);
        } else {
            // 短按：触发 5 秒快进
            videoDom.currentTime = Math.min(videoDom.currentTime + 5, videoDom.duration);
        }
    }, true);

})();