let processingMethod = '';
let currentSummaryVersion = 0;
let totalSummaryVersions = 1;
let summaryVersions = [];
let currentVideoTitle = '';
let currentVideoUrl = '';

window.updateSummaryDisplay = function() {
    if (summaryVersions.length > 0 && summaryVersions[currentSummaryVersion]) {
        document.getElementById('finalSummary').innerHTML = linkifyText(summaryVersions[currentSummaryVersion]);
        document.getElementById('summaryVersion').textContent = `版本：${currentSummaryVersion + 1}/${totalSummaryVersions}`;
        document.getElementById('prevVersion').disabled = currentSummaryVersion === 0;
        document.getElementById('nextVersion').disabled = currentSummaryVersion === totalSummaryVersions - 1;
    } else {
        console.error('No summary available for the current version');
        document.getElementById('finalSummary').innerHTML = '暫無可用摘要';
    }
}
document.addEventListener('DOMContentLoaded', (event) => {

    document.getElementById('refineSummary').addEventListener('click', showSummaryLightbox);
    document.getElementById('submitFeedback').addEventListener('click', submitFeedback);
    document.getElementById('prevVersion').addEventListener('click', () => changeSummaryVersion(-1));
    document.getElementById('nextVersion').addEventListener('click', () => changeSummaryVersion(1));
    
    // 點擊 Lightbox 外部關閉
    document.getElementById('summaryLightbox').addEventListener('click', function(e) {
        if (e.target === this) {
            hideSummaryLightbox();
        }
    });

    function updateSummaryDisplay() {
        console.log("Updating summary display", { currentSummaryVersion, totalSummaryVersions, summaryVersions });
        if (summaryVersions.length > 0 && summaryVersions[currentSummaryVersion]) {
            document.getElementById('finalSummary').innerHTML = linkifyText(summaryVersions[currentSummaryVersion]);
            document.getElementById('summaryVersion').textContent = `版本：${currentSummaryVersion + 1}/${totalSummaryVersions}`;
            document.getElementById('prevVersion').disabled = currentSummaryVersion === 0;
            document.getElementById('nextVersion').disabled = currentSummaryVersion === totalSummaryVersions - 1;
        } else {
            console.error('No summary available for the current version');
            document.getElementById('finalSummary').innerHTML = '暫無可用摘要';
        }
    }
    
    function showSummaryLightbox() {
        document.getElementById('summaryLightbox').classList.remove('hidden');
        document.getElementById('submitFeedback').disabled = false;
        document.getElementById('feedbackLoading').classList.add('hidden');
    }

    function hideSummaryLightbox() {
        document.getElementById('summaryLightbox').classList.add('hidden');
    }

    function submitFeedback() {
    console.log("開始提交反饋");
    console.log("當前摘要版本:", currentSummaryVersion);
    console.log("總摘要版本數:", totalSummaryVersions);
    const feedback = document.getElementById('userFeedback').value;
    const originalSummary = summaryVersions[currentSummaryVersion];
    const videoInfoContent = document.getElementById('videoInfoContent').textContent;
    let videoTitle = currentVideoTitle;
    let videoUrl = currentVideoUrl;

    // 顯示 loading 效果，禁用提交按鈕
    document.getElementById('submitFeedback').disabled = true;
    document.getElementById('feedbackLoading').classList.remove('hidden');
    
    // 禁用點擊外部關閉
    document.getElementById('summaryLightbox').style.pointerEvents = 'none';

    // 移除原始摘要中的視頻信息
    const summaryWithoutInfo = originalSummary.split('\n').slice(2).join('\n').trim();

    console.log("Submitting feedback:", {
        original_summary: summaryWithoutInfo,
        user_feedback: feedback,
        video_title: videoTitle,
        video_url: videoUrl
    });

    fetch('/refine_summary', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
        },
        body: JSON.stringify({
            original_summary: summaryWithoutInfo,
            user_feedback: feedback,
            video_title: videoTitle,
            video_url: videoUrl,
            processed_description: document.getElementById('videoInfoContent').textContent
        })
    })
    .then(response => {
        if (!response.ok) {
            throw new Error(`HTTP error! status: ${response.status}`);
        }
        return response.json();
    })
    .then(data => {
        console.log("Received data from server:", data);
        if (data.error) {
            throw new Error(data.error);
        }
        if (data.refined_summary) {
            console.log("收到新的摘要:", data.refined_summary);
            
            // 添加新摘要到陣列
            summaryVersions.push(data.refined_summary);
            
            // 更新當前版本為最新版本
            currentSummaryVersion = summaryVersions.length - 1;
            
            // 更新總版本數
            totalSummaryVersions = summaryVersions.length;
            
            console.log("更新後的版本信息:", {
                currentSummaryVersion: currentSummaryVersion,
                totalSummaryVersions: totalSummaryVersions,
                summaryVersionsLength: summaryVersions.length
            });
        
            // 更新顯示
            window.updateSummaryDisplay();
        
            console.log("摘要顯示已更新");
        
            // 隱藏反饋輸入框
            hideSummaryLightbox();
        } else {
            console.error("收到的摘要為空");
            throw new Error("收到的摘要為空");
        }
        hideSummaryLightbox();
    })
    .catch(error => {
        console.error('Error during feedback submission:', error);
        alert('提交反饋時出錯: ' + error.message);
    })
    .finally(() => {
        // 恢復提交按鈕，隱藏 loading 效果
        document.getElementById('submitFeedback').disabled = false;
        document.getElementById('feedbackLoading').classList.add('hidden');
        // 恢復點擊外部關閉
        document.getElementById('summaryLightbox').style.pointerEvents = 'auto';
    });
}
    
    

    function changeSummaryVersion(delta) {
        currentSummaryVersion += delta;
        if (currentSummaryVersion < 0) currentSummaryVersion = 0;
        if (currentSummaryVersion >= totalSummaryVersions) currentSummaryVersion = totalSummaryVersions - 1;
        window.updateSummaryDisplay(); // 使用 window.updateSummaryDisplay
    }
    

    document.getElementById('youtubeBtn').addEventListener('click', () => {
        processingMethod = 'youtube';
        document.getElementById('youtubeInput').classList.remove('hidden');
        document.getElementById('localVideoInput').classList.add('hidden');
    });

    document.getElementById('localVideoBtn').addEventListener('click', () => {
        processingMethod = 'local';
        document.getElementById('localVideoInput').classList.remove('hidden');
        document.getElementById('youtubeInput').classList.add('hidden');
    });

    document.getElementById('startProcessing').addEventListener('click', () => {
        let url_or_path = '';
        if (processingMethod === 'youtube') {
            url_or_path = document.getElementById('youtubeUrl').value;
        } else if (processingMethod === 'local') {
            const fileInput = document.getElementById('localVideoFile');
            if (fileInput.files.length > 0) {
                url_or_path = fileInput.files[0].name;
            }
        }

        if (!url_or_path) {
            alert('請選擇處理方式並輸入 URL 或選擇文件');
            return;
        }

        if (hasExistingContent()) {
            if (confirm('開始新的處理任務將清空當前內容。是否繼續？')) {
                clearPreviousContent();
                startProcessing(url_or_path);
            }
        } else {
            startProcessing(url_or_path);
        }
    });

    document.getElementById('toggleTranscript').addEventListener('click', () => {
        const transcript = document.getElementById('transcript');
        transcript.style.display = transcript.style.display === 'none' ? 'block' : 'none';
    });
});

function hasExistingContent() {
    return !document.getElementById('videoInfo').classList.contains('hidden') ||
        !document.getElementById('summary').classList.contains('hidden') ||
        !document.getElementById('segmentSummaries').classList.contains('hidden') ||
        document.getElementById('transcript').textContent.trim() !== '';
}

function clearPreviousContent() {
    // 清空 UI 內容
    document.getElementById('videoInfo').classList.add('hidden');
    document.getElementById('videoInfoContent').textContent = '';
    document.getElementById('status').classList.add('hidden');
    document.getElementById('status').textContent = '';
    document.getElementById('summary').classList.add('hidden');
    document.getElementById('finalSummary').innerHTML = '';
    document.getElementById('segmentSummaries').classList.add('hidden');
    document.getElementById('summaries').innerHTML = '';
    document.getElementById('transcript').textContent = '';

    // 重置全局變量
    currentSummaryVersion = 0;
    totalSummaryVersions = 1;  // 重置為 1
    summaryVersions = [];
    
    // 重置版本顯示
    document.getElementById('summaryVersion').textContent = '版本：1/1';
    
    // 禁用版本切換按鈕
    document.getElementById('prevVersion').disabled = true;
    document.getElementById('nextVersion').disabled = true;
    
    // 清空反饋輸入框
    document.getElementById('userFeedback').value = '';
}

function startProcessing(url_or_path) {
    clearPreviousContent(); 
    currentVideoTitle = '';
    currentVideoUrl = url_or_path;
    document.getElementById('status').classList.remove('hidden');
    document.getElementById('status').textContent = '⌛️ 處理中...';
    
    const formData = new FormData();
    formData.append('url_or_path', url_or_path);
    if (processingMethod === 'local') {
        const fileInput = document.getElementById('localVideoFile');
        if (fileInput.files.length > 0) {
            formData.append('file', fileInput.files[0]);
            currentVideoTitle = fileInput.files[0].name;
        }
        formData.append('localVideoDescription', document.getElementById('localVideoDescription').value);
    } else {
        currentVideoTitle = ''; // 將在收到視頻信息時更新
    }

    fetch('/process', {
        method: 'POST',
        body: formData
    })
    .then(response => {
        const reader = response.body.getReader();
        const decoder = new TextDecoder();
        
        function readStream() {
            return reader.read().then(({ done, value }) => {
                if (done) {
                    console.log('Stream complete');
                    return;
                }
                const chunk = decoder.decode(value);
                handleServerSentEvent(chunk);
                return readStream();
            });
        }
        
        return readStream();
    })
    .catch(error => {
        console.error('Error:', error);
        document.getElementById('status').textContent = `錯誤: ${error.message}`;
    });
}

function handleServerSentEvent(chunk) {
    const lines = chunk.split('\n');
    lines.forEach(line => {
        if (line.startsWith('data: ')) {
            const data = JSON.parse(line.slice(6));
            updateUI(data);
        }
    });
}

function updateUI(data) {
    document.getElementById('status').textContent = data.status;
    
    
    if (data.video_info) {
        document.getElementById('videoInfo').classList.remove('hidden');
        let videoInfoContent = `標題：${data.video_info.title}\n`;
        videoInfoContent += `時長：${data.video_info.duration}\n`;
        videoInfoContent += `觀看次數：${data.video_info.view_count}\n`;
        videoInfoContent += `喜歡數：${data.video_info.like_count}\n`;
        videoInfoContent += `描述：${data.video_info.description}`;
        
        if (videoInfoContent.length > 300) {
            videoInfoContent = videoInfoContent.substring(0, 300) + '... ...';
        }
        
        document.getElementById('videoInfoContent').textContent = videoInfoContent;
        // 更新當前視頻標題
        currentVideoTitle = data.video_info.title;
    }
    
    console.log("Received data:", data);

    if (data.final_summary) {
        console.log("Updating final summary");
        document.getElementById('summary').classList.remove('hidden');
        const summaryWithInfo = `影片名稱：${currentVideoTitle}\n網址或路徑：${currentVideoUrl}\n\n${data.final_summary}`;

        /* // 從視頻信息中獲取標題和 URL/路徑
        const videoTitle = document.getElementById('videoInfoContent').textContent.split('\n')[0].replace('標題：', '').trim();
        const videoUrl = document.getElementById('youtubeUrl').value || document.getElementById('localVideoFile').value;
        
        // 在摘要前添加影片名稱和 URL/路徑信息
        const summaryWithInfo = `影片名稱：${videoTitle}\n網址或路徑：${videoUrl}\n\n${data.final_summary}`; */
        
        summaryVersions = [summaryWithInfo];
        currentSummaryVersion = 0;
        totalSummaryVersions = 1;  // 重置為 1
        console.log("Calling updateSummaryDisplay");
        window.updateSummaryDisplay();
        console.log("updateSummaryDisplay called");
    }
    
    if (data.summary) {
        document.getElementById('segmentSummaries').classList.remove('hidden');
        document.getElementById('summaries').innerHTML += linkifyText(data.summary) + '\n\n';
    }
    
    if (data.transcript) {
        document.getElementById('transcript').textContent = data.transcript;
    }
    
    if (data.error) {
        alert(data.error);
    }
}

function linkifyText(text) {
    const urlRegex = /(https?:\/\/[^\s]+)/g;
    return text.replace(urlRegex, function(url) {
        return `<a href="${url}" target="_blank" class="text-blue-600 hover:underline">${url}</a>`;
    });
}