// ==UserScript==
// @name         视频触屏滑动脚本
// @namespace    http://tampermonkey.net/
// @version      1.0.1
// @description  左右滑动可以拖动视频进度条
// @author       sanngtsu
// @match        *://*/*
// @grant        none
// @run-at       document-end
// ==/UserScript==

(function() {
    'use strict';

    const SENSITIVITY = 0.6;
    const MIN_SWIPE_DISTANCE = 10;

    let isTouching = false;
    let startX = 0, startY = 0;
    let startVideoTime = 0;
    let currentVideo = null;
    let hasMoved = false;
    let tipElement = null;

    function formatTime(seconds) {
        if (isNaN(seconds)) return "00:00";
        const m = Math.floor(seconds / 60).toString().padStart(2, '0');
        const s = Math.floor(seconds % 60).toString().padStart(2, '0');
        return `${m}:${s}`;
    }

    function createTip() {
        if (tipElement) return;
        tipElement = document.createElement('div');
        tipElement.style.cssText = `
            position: absolute;
            z-index: 99999999;
            background: rgba(0, 0, 0, 0.75);
            color: #fff;
            padding: 8px 14px;
            border-radius: 6px;
            font-size: 16px;
            font-weight: 500;
            display: none;
            pointer-events: none;
            white-space: nowrap;
        `;
    }

    function getFullscreenContainer() {
        return document.fullscreenElement || document.documentElement;
    }

    function isFullscreen() {
        return !!document.fullscreenElement;
    }

    function showTip(video, current, total) {
        if (!tipElement) createTip();
        const container = getFullscreenContainer();
        if (tipElement.parentElement !== container) {
            container.appendChild(tipElement);
        }
        const rect = video.getBoundingClientRect();
        tipElement.textContent = `${formatTime(current)} / ${formatTime(total)}`;
        tipElement.style.left = '50%';
        tipElement.style.transform = 'translate(-50%, 0)';
        tipElement.style.top = rect.top + 60 + 'px';
        tipElement.style.display = 'block';
    }

    function hideTip() {
        if (tipElement) tipElement.style.display = 'none';
    }

    function getActiveVideo() {
        const videos = document.querySelectorAll('video');
        for (let v of videos) {
            if (!v.paused && !v.ended) return v;
        }
        return videos[0] || null;
    }

    document.addEventListener('touchstart', e => {
        if (!isFullscreen()) return;
        if (e.touches.length !== 1) return;
        currentVideo = getActiveVideo();
        if (!currentVideo) return;

        isTouching = true;
        hasMoved = false;
        startX = e.touches[0].clientX;
        startY = e.touches[0].clientY;
        startVideoTime = currentVideo.currentTime;
    }, { passive: true });

    document.addEventListener('touchmove', e => {
        if (!isFullscreen()) return;
        if (!isTouching || !currentVideo) return;
        if (e.touches.length !== 1) return;

        const nowX = e.touches[0].clientX;
        const nowY = e.touches[0].clientY;
        const diffX = Math.abs(nowX - startX);
        const diffY = Math.abs(nowY - startY);

        if (diffX < MIN_SWIPE_DISTANCE && diffY > MIN_SWIPE_DISTANCE) return;
        if (diffX > 3) hasMoved = true;

        const moveX = nowX - startX;
        const timeChange = moveX * SENSITIVITY;
        let newTime = startVideoTime + timeChange;
        newTime = Math.max(0, Math.min(newTime, currentVideo.duration));
        currentVideo.currentTime = newTime;

        showTip(currentVideo, newTime, currentVideo.duration);
        e.preventDefault();
    }, { passive: false });

    document.addEventListener('touchend', e => {
        if (!isFullscreen()) return;
        if (!isTouching) return;
        
        if (hasMoved) {
            e.preventDefault();
            e.stopPropagation();
        }
        setTimeout(() => hideTip(), 150);

        isTouching = false;
        currentVideo = null;
        hasMoved = false;
    });

    document.addEventListener('touchcancel', () => {
        if (!isFullscreen()) return;
        hideTip();
        isTouching = false;
        currentVideo = null;
        hasMoved = false;
    });
})();