// ==UserScript==
// @name         Bilibili 进度条精确控制
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  按下ctrl或者shift键时，按下左右箭头键可以实现0.5秒或者0.1秒的快进快退
// @author       You
// @icon         https://www.bilibili.com/favicon.ico
// @match        https://www.bilibili.com/video/*
// @match        https://www.bilibili.com/list/*
// @match        https://www.bilibili.com/bangumi/play/*
// @match        https://www.bilibili.com/cheese/play/*
// @match        https://www.bilibili.com/festival/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    document.addEventListener('keydown', (e) => {
        // 1. Determine Step based on modifier keys
        let step = 0;
        if (e.shiftKey) {
            step = 0.5;
        } else if (e.ctrlKey) {
            step = 0.1;
        }

        // 2. If no modifier key we care about, return
        if (step === 0) return;

        // 3. Check for Arrow keys
        if (e.key !== 'ArrowLeft' && e.key !== 'ArrowRight') return;

        // 4. Avoid triggering when typing in inputs
        const activeTag = document.activeElement ? document.activeElement.tagName.toUpperCase() : '';
        if (activeTag === 'INPUT' || activeTag === 'TEXTAREA' || document.activeElement.isContentEditable) {
            return;
        }

        // 5. Find the video element
        const video = document.querySelector('video');
        if (!video) return;

        // 6. Execute Seek
        e.preventDefault();
        e.stopPropagation();

        const sign = e.key === 'ArrowRight' ? 1 : -1;
        
        // Calculate new time with boundaries
        let newTime = video.currentTime + (sign * step);
        if (newTime < 0) newTime = 0;
        if (newTime > video.duration) newTime = video.duration;

        video.currentTime = newTime;
    }, true); // Use capture phase to ensure we intercept before site listeners

})();