// ==UserScript==
// @name         华为人才在线课程助手 (Huawei Talent Helper)
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  自动完成视频任务，并保存视频字幕
// @author       Antigravity
// @match        *://e.huawei.com/cn/talent/*
// @match        *://talent.shixizhi.huawei.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // 状态 management
    const state = {
        autoNext: true,
        playSpeed: 2.0,
        subtitles: [],
        lastVideoId: null
    };

    // UI 控制面板
    function createUI() {
        if (document.getElementById('huawei-helper-panel')) return;

        const panel = document.createElement('div');
        panel.id = 'huawei-helper-panel';
        panel.style = `
            position: fixed;
            top: 20px;
            right: 20px;
            z-index: 10000;
            background: #fff;
            border: 1px solid #ccc;
            padding: 10px;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            font-family: Arial, sans-serif;
            font-size: 14px;
            width: 180px;
        `;

        panel.innerHTML = `
            <div style="font-weight: bold; margin-bottom: 8px; border-bottom: 1px solid #eee; padding-bottom: 5px;">华为人才助手</div>
            <div style="margin-bottom: 5px;">
                <label><input type="checkbox" id="auto-next-btn" ${state.autoNext ? 'checked' : ''}> 自动连播</label>
            </div>
            <div style="margin-bottom: 8px;">
                播放倍速: <input type="number" id="play-speed-input" value="${state.playSpeed}" step="0.5" style="width: 50px;">
            </div>
            <button id="download-sub-btn" style="width: 100%; padding: 5px; background: #007bff; color: #fff; border: none; border-radius: 4px; cursor: pointer;">
                下载字幕 (${state.subtitles.length})
            </button>
        `;

        document.body.appendChild(panel);

        // 事件绑定
        document.getElementById('auto-next-btn').addEventListener('change', (e) => {
            state.autoNext = e.target.checked;
        });

        document.getElementById('play-speed-input').addEventListener('input', (e) => {
            state.playSpeed = parseFloat(e.target.value) || 1.0;
            applySpeed();
        });

        document.getElementById('download-sub-btn').addEventListener('click', () => {
            downloadSubtitles();
        });
    }

    // 设置倍速
    function applySpeed() {
        const video = document.querySelector('video');
        if (video) {
            video.playbackRate = state.playSpeed;
        }
    }

    // 监控视频状态
    function monitorVideo() {
        const video = document.querySelector('video');
        if (!video) return;

        if (video.playbackRate !== state.playSpeed) {
            video.playbackRate = state.playSpeed;
        }

        if (video.paused && !video.ended) {
            // 尝试自动播放
            video.play().catch(() => {});
        }

        if (video.ended && state.autoNext) {
            video.ended = false; // 重置
            goToNext();
        }
    }

    // 下一讲
    function goToNext() {
        console.log('Video ended, trying to find next lesson...');
        const nextBtn = document.querySelector('.course-next-item') || 
                        Array.from(document.querySelectorAll('span, div')).find(el => el.innerText.includes('下一讲'));
        
        if (nextBtn) {
            nextBtn.click();
        } else {
            console.warn('Next lesson button not found.');
        }
    }

    // 拦截 API 获取字幕
    const originXHR = window.XMLHttpRequest;
    window.XMLHttpRequest = function() {
        const xhr = new originXHR();
        const send = xhr.send;
        xhr.send = function() {
            this.addEventListener('load', function() {
                if (this.responseURL.includes('querySubtitleContent')) {
                    try {
                        const data = JSON.parse(this.responseText);
                        if (data && data.data) {
                            state.subtitles = data.data;
                            updateSubBtnCount();
                        }
                    } catch (e) {
                        console.error('Failed to parse subtitle JSON', e);
                    }
                }
            });
            return send.apply(this, arguments);
        };
        return xhr;
    };

    function updateSubBtnCount() {
        const btn = document.getElementById('download-sub-btn');
        if (btn) {
            btn.innerText = `下载字幕 (${state.subtitles.length})`;
        }
    }

    // JSON 转 SRT
    function convertToSRT(subs) {
        return subs.map((s, i) => {
            const start = formatTime(s.startTime);
            const end = formatTime(s.endTime);
            return `${i + 1}\n${start} --> ${end}\n${s.content}\n\n`;
        }).join('');
    }

    function formatTime(seconds) {
        const date = new Date(0);
        date.setSeconds(Math.floor(seconds));
        const time = date.toISOString().substr(11, 8);
        const ms = Math.floor((seconds % 1) * 1000).toString().padStart(3, '0');
        return `${time},${ms}`;
    }

    // 下载字幕文件
    function downloadSubtitles() {
        if (state.subtitles.length === 0) {
            alert('尚未捕获到字幕，请确保视频正在播放。');
            return;
        }
        const srtContent = convertToSRT(state.subtitles);
        const blob = new Blob([srtContent], { type: 'text/plain' });
        const url = URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = `subtitle_${Date.now()}.srt`;
        a.click();
        URL.revokeObjectURL(url);
    }

    // 初始化驱动
    setInterval(() => {
        createUI();
        monitorVideo();
        applySpeed();
    }, 2000);

})();