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document.addEventListener('DOMContentLoaded', () => {
    const convo = document.querySelector(".convo");
    const fileUpload = document.getElementById('file-upload');
    const imageUpload = document.getElementById('image-upload');
    const fileBtn = document.getElementById('file-btn');
    const imageBtn = document.getElementById('image-btn');
    const sendButtons = document.querySelectorAll('.sendingQA');
    const SummarizeInput = document.querySelector(".SummarizeInput");
    const CaptionInput = document.querySelector(".CaptionInput");
    const gotItButton = document.querySelector('.explainChoix button');
    const explainChoixDiv = document.querySelector('.explainChoix');

    let selectedFile = null;

    // Default mode is summarize 
    const summarizeRadio = document.getElementById('summarize-radio');
    if (summarizeRadio) summarizeRadio.checked = true;

    //  Mode switching
    document.querySelectorAll('.select-options input[name="mode"]').forEach(radio => {
        radio.addEventListener('change', (e) => {
            const selected = e.target.value;
            if (selected === "Summarize") {
                SummarizeInput.classList.add("active");
                SummarizeInput.classList.remove("innactive");
                CaptionInput.classList.remove("active");
                CaptionInput.classList.add("innactive");
            } else {
                SummarizeInput.classList.add("innactive");
                SummarizeInput.classList.remove("active");
                CaptionInput.classList.remove("innactive");
                CaptionInput.classList.add("active");
            }
        });
    });

    fileBtn.addEventListener('click', () => fileUpload.click());
    imageBtn.addEventListener('click', () => imageUpload.click());

    fileUpload.addEventListener('change', (e) => {
        if (e.target.files.length) {
            selectedFile = e.target.files[0];
            displayFilePreview(selectedFile);
        }
    });

    imageUpload.addEventListener('change', (e) => {
        if (e.target.files.length) {
            selectedFile = e.target.files[0];
            displayFilePreview(selectedFile);
        }
    });

    gotItButton.addEventListener('click', () => {
        explainChoixDiv.style.display = "none";
    });

    sendButtons.forEach(button => {
        button.addEventListener('click', handleSubmit);
    });

    function displayFilePreview(file) {
        const previewBubble = document.createElement("div");
        previewBubble.className = "file-preview-bubble bubble right";
        previewBubble.style.maxWidth = "50%";
        previewBubble.style.display = "flex";
        previewBubble.style.flexDirection = "column";

        if (file.type.startsWith('image/')) {
            const reader = new FileReader();
            reader.onload = (e) => {
                const img = document.createElement("img");
                img.src = e.target.result;
                img.style.width = "100%";
                img.style.height = "200px";
                img.style.objectFit = "cover";
                img.style.borderRadius = "10px";
                img.style.marginBottom = "8px";

                const label = document.createElement("span");
                label.textContent = `πŸ“Ž Selected image: ${file.name}`;
                label.style.fontSize = "13px";

                previewBubble.appendChild(img);
                previewBubble.appendChild(label);
                convo.appendChild(previewBubble);
                convo.scrollTop = convo.scrollHeight;
            };
            reader.readAsDataURL(file);
        } else {
            const text = document.createElement("span");
            text.textContent = `πŸ“Ž Selected document: ${file.name}`;
            text.style.fontSize = "13px";
            previewBubble.appendChild(text);
            convo.appendChild(previewBubble);
            convo.scrollTop = convo.scrollHeight;
        }
    }

/*function createMessageBubble(text, sender = "You", audioSrc = null, fileName = null) {
    const bubble = document.createElement('div');
    bubble.className = `bubble ${sender === "You" ? "right" : "left"}`;
    bubble.style.maxWidth = "50%";
    bubble.style.wordWrap = "break-word";

    const label = document.createElement('div');
    label.className = "label";
    label.textContent = sender;

    const message = document.createElement('div');
    message.className = "text";
    message.style.whiteSpace = "pre-wrap";
    message.style.display = "flex";
    message.style.flexDirection = "column";

    const textSpan = document.createElement("span");
    textSpan.innerHTML = text;
    message.appendChild(textSpan);

  
    if (sender !== "You" && (audioSrc || fileName)) {
        const iconContainer = document.createElement('div');
        iconContainer.style.marginTop = "10px";
        iconContainer.style.display = "flex";
        iconContainer.style.justifyContent = "flex-end";
        iconContainer.style.gap = "15px";

        if (audioSrc) {
            const audio = new Audio(audioSrc);
            const audioIcon = document.createElement("i");
            audioIcon.className = "fa-solid fa-volume-high audio-toggle";
            audioIcon.title = "Play Audio";
            audioIcon.style.cursor = "pointer";
            audioIcon.style.fontSize = "18px";

            audioIcon.addEventListener("click", () => {
                if (audio.paused) {
                    audio.play();
                    audioIcon.classList.remove("fa-volume-xmark");
                    audioIcon.classList.add("fa-volume-high");
                    audioIcon.title = "Mute Audio";
                } else {
                    audio.pause();
                    audioIcon.classList.remove("fa-volume-high");
                    audioIcon.classList.add("fa-volume-xmark");
                    audioIcon.title = "Unmute Audio";
                }
            });

            iconContainer.appendChild(audioIcon);
        }

        if (fileName) {
            const filenameOnly = fileName.split("/").pop(); 
            const downloadLink = document.createElement('a');
            downloadLink.href = `/files/${filenameOnly}`;
            downloadLink.target = "_blank";
            downloadLink.download = filenameOnly;

            const downloadIcon = document.createElement("i");
            downloadIcon.className = "fa-solid fa-file-arrow-down";
            downloadIcon.style.fontSize = "18px";
            downloadIcon.style.cursor = "pointer";

            downloadLink.appendChild(downloadIcon);
            iconContainer.appendChild(downloadLink);
        }

        message.appendChild(iconContainer);
    }

    bubble.appendChild(label);
    bubble.appendChild(message);
    convo.appendChild(bubble);
    convo.scrollTop = convo.scrollHeight;
    return bubble;
}*/
function createMessageBubble(text, sender = "You", audioSrc = null, fileName = null) {
    const bubble = document.createElement('div');
    bubble.className = `bubble ${sender === "You" ? "right" : "left"}`;
    bubble.style.maxWidth = "50%";
    bubble.style.wordWrap = "break-word";

    const label = document.createElement('div');
    label.className = "label";
    label.textContent = sender;

    const message = document.createElement('div');
    message.className = "text";
    message.style.whiteSpace = "pre-wrap";
    message.style.display = "flex";
    message.style.flexDirection = "column";

    const textSpan = document.createElement("span");
    textSpan.innerHTML = text;
    message.appendChild(textSpan);

    if (sender !== "You" && (audioSrc || fileName)) {
        const iconContainer = document.createElement('div');
        iconContainer.style.marginTop = "10px";
        iconContainer.style.display = "flex";
        iconContainer.style.justifyContent = "flex-end";
        iconContainer.style.gap = "15px";

        // Audio Player 
        if (audioSrc) {
            const audio = new Audio(audioSrc);
            const audioIcon = document.createElement("i");
            audioIcon.className = "fa-solid fa-volume-high audio-toggle";
            audioIcon.title = "Play Audio";
            audioIcon.style.cursor = "pointer";
            audioIcon.style.fontSize = "18px";

          
            const updateAudioIcon = () => {
                if (audio.paused) {
                    audioIcon.classList.replace("fa-volume-xmark", "fa-volume-high");
                    audioIcon.title = "Play Audio";
                } else {
                    audioIcon.classList.replace("fa-volume-high", "fa-volume-xmark");
                    audioIcon.title = "Pause Audio";
                }
            };

            audio.addEventListener('play', updateAudioIcon);
            audio.addEventListener('pause', updateAudioIcon);
            audio.addEventListener('ended', updateAudioIcon);

            audioIcon.addEventListener("click", () => {
                audio.paused ? audio.play().catch(e => console.error("Audio error:", e)) : audio.pause();
            });

            iconContainer.appendChild(audioIcon);
        }

        // PDF Download 
        if (fileName) {
            const downloadLink = document.createElement('a');
            downloadLink.href = fileName;
            downloadLink.target = "_blank";
            downloadLink.download = fileName.split('/').pop() || "summary.pdf";
            
            const downloadIcon = document.createElement("i");
            downloadIcon.className = "fa-solid fa-file-arrow-down";
            downloadIcon.style.fontSize = "18px";
            downloadIcon.style.cursor = "pointer";
            downloadIcon.title = "Download Summary PDF";
            
            downloadLink.appendChild(downloadIcon);
            iconContainer.appendChild(downloadLink);
        }

        message.appendChild(iconContainer);
    }

    bubble.appendChild(label);
    bubble.appendChild(message);
    convo.appendChild(bubble);
    convo.scrollTop = convo.scrollHeight;
    
    return bubble;
}
    async function handleSubmit() {
        if (!selectedFile) {
            alert("Please upload a file first");
            return;
        }

        const isSummarize = document.querySelector('input[name="mode"]:checked').value === "Summarize";
        const length = document.querySelector('input[name="length"]:checked')?.value.toLowerCase(); 

        const endpoint = isSummarize
            ? "/Summarization/summarize/"
            : "/Summarization/imagecaption/";

        const loaderText = isSummarize
            ? "Processing document πŸ“„... <div class='loader'></div>"
            : "Generating caption πŸ–ΌοΈ... <div class='loader'></div>";

        const thinkingBubble = createMessageBubble(loaderText, "Aidan");

        const formData = new FormData();
        formData.append("file", selectedFile);
        if (isSummarize) formData.append("length", length);

        try {
            const response = await fetch(endpoint, {
                method: "POST",
                body: formData
            });

            if (!response.ok) {
                const error = await response.json().catch(() => null);
                throw new Error(error?.detail || error?.error || "Request failed");
            }

            const result = await response.json();
            thinkingBubble.remove();

            createMessageBubble(
                isSummarize ? (result.summary || "No summary generated.") : (result.caption || "No caption generated."),
                "Aidan",
                result.audio || result.audioUrl || null,
                result.pdfUrl || null
            );
        } catch (error) {
            thinkingBubble.remove();
            createMessageBubble(`⚠️ Error: ${error.message}`, "Aidan");
        } finally {
            selectedFile = null;
        }
    }

    // Add loader CSS dynamically
    const style = document.createElement('style');
    style.textContent = `
        .loader {
            display: inline-block;
            border: 2px solid #f3f3f3;
            border-top: 2px solid #3b82f6;
            border-radius: 50%;
            width: 16px;
            height: 16px;
            animation: spin 1s linear infinite;
        }
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        .audio-toggle {
            transition: 0.2s;
        }
    `;
    document.head.appendChild(style);

    // Back button
    document.querySelector(".fa-arrow-left").addEventListener("click", () => {
        window.location.href = "/";
    });
});