import { SerialManager } from './serial.js';


window.onload = () => {
    const serial = new SerialManager();
    const statusText = document.getElementById('statusText');
    const disconnectBtn = document.getElementById('disconnect');
    const connectBtn = document.getElementById('connect');

    let isInterpolating = false;
    let currentFrame = 0;
    let dialKeyframes = Array.from({ length: 5 }, () => ({}));
    let currentAnimation = null;

    let selectedDial = null;
    let draggingKeyframe = null; // { dialIndex, originalFrame }
    let isDragging = false;
    const dialColors = ['red', 'green', 'blue', 'orange', 'purple'];

    const dials = [];
    const frameSlider = document.getElementById('frameSlider');
    const frameDisplay = document.getElementById('frameDisplay');
    const canvas = document.getElementById('timelineCanvas');
    const ctx = canvas.getContext('2d');
    const totalFrames = 500;





    // Animation File List
    const fileListElement = document.getElementById('fileList');
    const loadButton = document.getElementById('loadFile');
    const deleteButton = document.getElementById('deleteFile');

    let selectedFile = null;

    function clearFileList() {
        fileListElement.innerHTML = '';
        selectedFile = null;
        loadButton.disabled = true;
        deleteButton.disabled = true;
    }


    function addFileToList(filename) {
        const li = document.createElement('li');
        li.textContent = filename;

        li.addEventListener('click', () => {
            // Deselect previous
            const previouslySelected = fileListElement.querySelector('.selected');
            if (previouslySelected) previouslySelected.classList.remove('selected');

            // Select new
            li.classList.add('selected');
            selectedFile = filename;
            loadButton.disabled = false;
            deleteButton.disabled = false;
        });

        fileListElement.appendChild(li);
    }

    loadButton.addEventListener('click', () => {
        if (!selectedFile || loadButton.disabled) return;

        const filename = "/" + selectedFile;
        console.log(`Loading file: ${filename}`);

        // 🧷 Lock buttons
        loadButton.disabled = true;
        deleteButton.disabled = true;

        serial.requestFile(filename);
    });


    deleteButton.addEventListener('click', () => {
        if (selectedFile) {
            console.log(`Deleting file: ${selectedFile}`);
            // Add logic to send delete command to ESP32

            // Remove from UI
            const selectedLi = fileListElement.querySelector('.selected');
            if (selectedLi) selectedLi.remove();
            selectedFile = null;
            loadButton.disabled = true;
            deleteButton.disabled = true;
        }
    });







    // Timeline

    frameSlider.oninput = () => {
        currentFrame = parseInt(frameSlider.value);
        frameDisplay.textContent = currentFrame;
        isInterpolating = true;

        for (let ch = 0; ch < 5; ch++) {
            const keyframes = dialKeyframes[ch];
            let prevFrame = null, nextFrame = null;

            for (let f = currentFrame; f >= 0; f--) {
                if (keyframes[f] !== undefined) {
                    prevFrame = f;
                    break;
                }
            }
            for (let f = currentFrame; f <= 399; f++) {
                if (keyframes[f] !== undefined) {
                    nextFrame = f;
                    break;
                }
            }

            let value;
            if (prevFrame !== null && nextFrame !== null && prevFrame !== nextFrame) {
                const prevVal = keyframes[prevFrame];
                const nextVal = keyframes[nextFrame];
                const t = (currentFrame - prevFrame) / (nextFrame - prevFrame);
                value = Math.round(prevVal + (nextVal - prevVal) * t);
            } else if (prevFrame !== null) {
                value = keyframes[prevFrame];
            } else if (nextFrame !== null) {
                value = keyframes[nextFrame];
            } else {
                value = 512;
            }

            dials[ch].value = value;
            document.getElementById(`value${ch}`).textContent = value;
        }

        drawTimelineMarkers();
        isInterpolating = false;
    };

    for (let i = 0; i < 5; i++) {
        dials[i] = new Nexus.Dial(`#dial${i}`, {
            size: [80, 80],
            min: 0,
            max: 1023,
            value: 512
        });

        dials[i].colorize("accent", dialColors[i]);

        dials[i].on('change', (v) => {
            if (isInterpolating) return;
            const val = Math.round(v);
            document.getElementById(`value${i}`).textContent = val;
            dialKeyframes[i][currentFrame] = val;
            drawTimelineMarkers();
        });
    }
    document.querySelectorAll('.dial').forEach(el => {
        el.onclick = () => {
            selectedDial = parseInt(el.dataset.index);

            document.querySelectorAll('.dial').forEach(d => d.classList.remove('selected'));
            el.classList.add('selected');

            drawTimelineMarkers();
        };
    });


    // Connect button
    document.getElementById('connect').addEventListener('click', async () => {
        try {
            await serial.connect();
            statusText.textContent = 'Connected ✅';
            disconnectBtn.hidden = false;
            connectBtn.hidden = true;
            console.log("Serial connected");
            let text = "";
            serial.startReading((command, payload) => {
                switch (command) {
                    case 0x01: // ID response
                        text = new TextDecoder().decode(new Uint8Array(payload));
                        document.getElementById('log').value += `ID Response: ${text}\n`;
                        break;

                    case 0x02: // File response
                        text = new TextDecoder().decode(new Uint8Array(payload));
                        const files = text.trim().split('\n');
                        document.getElementById('log').value += `File list Response: ${files}\n`;
                        clearFileList();

                        files.forEach(filename => {
                            if (filename) addFileToList(filename);
                        });

                        break;
                    case 0x03: { // CMD_LOAD_FILE
                        const fileData = new Uint8Array(payload);
                        console.log(`Received file (${fileData.length} bytes)`);

                        // 🔹 Do something with the file
                        handleLoadedFile(fileData);
                        break;
                    }

                    // Add more cases as needed
                    default:
                        document.getElementById('log').value += `Unknown command ${command}\n`;
                        break;
                }
            });


            // 🔹 Send ID request (CMD_ID_REQUEST = 0x01)
            await serial.requestIDPacket();

            await serial.requestFileList(); // or use a constant if defined



        } catch (err) {
            statusText.textContent = 'Connection failed ❌';
            console.error("Connection error:", err);
        }
    });

    function handleLoadedFile(data) {
        // Ensure data is a Uint8Array
        console.log(data.buffer);
        const raw = new Uint8Array(data);
        const view = new DataView(raw.buffer);
        let offset = 0;

        // 🔹 Parse header
        const magic = String.fromCharCode(
            view.getUint8(offset),
            view.getUint8(offset + 1),
            view.getUint8(offset + 2),
            view.getUint8(offset + 3)
        );
        offset += 4;

        const frameCount = view.getUint16(offset, true); offset += 2; // big-endian
        const version = view.getUint8(offset++);
        const frameRate = view.getUint8(offset++);
        offset += 8; // reserved

        if (magic !== "ANIM") {
            console.error("Invalid file format");
            return;
        }

        console.log("🧩 Magic:", magic);
        console.log("🎞️ Frame Count:", frameCount);
        console.log("📦 Version:", version);
        console.log("⏱️ Frame Rate:", frameRate);

        const NUM_CHANNELS = 5;
        const HEADER_SIZE = 16;
        const FRAME_SIZE = NUM_CHANNELS * 2;
        //const frameCount = view.getUint16(4, true); // already parsed earlier

        const frames = [];
        //let offset = HEADER_SIZE;

        for (let i = 0; i < frameCount; i++) {
            const frame = [];
            for (let c = 0; c < NUM_CHANNELS; c++) {
                frame.push(view.getUint16(offset, true));
                offset += 2;
            }
            frames.push(frame);
        }

        console.log(frames);
        console.log(offset);
        offset = 5016;
        let keyFrameCount = view.getUint16(offset, true);
        offset += 2;

        let keyframes = [];
        for (var i = 0; i < keyFrameCount; i++) {
            let motorID = view.getUint8(offset); offset += 1;
            let frame = view.getUint16(offset, true); offset += 2;
            let position = view.getUint16(offset, true); offset += 2;
            keyframes.push({ motorID, frame, position });
        }

        console.log(keyFrameCount);
        console.log(keyframes);
        dialKeyframes = Array.from({ length: 5 }, () => ({}));
        keyframes.forEach(({ motorID, frame, position }) => {
            if (!dialKeyframes[motorID]) {
                dialKeyframes[motorID] = []; // Initialize if missing
            }
            dialKeyframes[motorID][frame] = position;
        });

        // 🔓 Unlock buttons
        loadButton.disabled = false;
        deleteButton.disabled = false;
    }




    // Disconnect button
    disconnectBtn.addEventListener('click', () => {
        serial.disconnect();
        statusText.textContent = 'Disconnected';
        disconnectBtn.hidden = true;
        connectBtn.hidden = false;
        console.log("Serial disconnected");
    });



    document.getElementById('send').onclick = async () => {
        const text = document.getElementById('input').value + '\n';
        const encoder = new TextEncoder();
        await writer.write(encoder.encode(text));
        document.getElementById('input').value = '';
    };

    document.getElementById('sendFrame').onclick = async () => {
        // const positions = dials.map(d => Math.round(d.value));
        // const message = `FRAME ${positions.join(',')}\n`;
        // const encoder = new TextEncoder();
        // await writer.write(encoder.encode(message));
        console.log(dialKeyframes);
    };

    function drawTimelineMarkers() {
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        const width = canvas.width;
        const height = canvas.height;

        // Draw tick marks every 50 frames
        ctx.strokeStyle = '#aaa';
        ctx.lineWidth = 1;
        for (let f = 0; f <= totalFrames; f += 25) {
            const x = (f / totalFrames) * width;
            ctx.beginPath();
            ctx.moveTo(x, height * 0.75); // small tick at bottom
            ctx.lineTo(x, height);
            ctx.stroke();
        }
        for (let f = 0; f <= totalFrames; f += 50) {
            const x = (f / totalFrames) * width;
            ctx.beginPath();
            ctx.moveTo(x, height * 0.65); // small tick at bottom
            ctx.lineTo(x, height);
            ctx.stroke();
        }

        // Draw label on tick marks
        ctx.fillStyle = '#666';
        ctx.font = '10px sans-serif';
        ctx.textAlign = 'center';

        for (let f = 0; f <= totalFrames; f += 50) {
            const x = (f / totalFrames) * width;
            const seconds = f / 50;
            ctx.fillText(seconds.toString() + "s", x, height - 12);
        }


        if (selectedDial !== null) {
            for (let frame in dialKeyframes[selectedDial]) {
                const x = (frame / 400) * width;
                ctx.beginPath();
                ctx.moveTo(x, 0);
                ctx.lineTo(x, height);
                ctx.strokeStyle = dialColors[selectedDial];
                ctx.lineWidth = 2;
                ctx.stroke();
            }
        } else {
            for (let ch = 0; ch < 5; ch++) {
                for (let frame in dialKeyframes[ch]) {
                    const x = (frame / 400) * width;
                    ctx.beginPath();
                    ctx.moveTo(x, 0);
                    ctx.lineTo(x, height);
                    ctx.strokeStyle = dialColors[ch];
                    ctx.lineWidth = 1;
                    ctx.stroke();
                }
            }
        }

        const currentX = (currentFrame / 400) * width;
        ctx.beginPath();
        ctx.moveTo(currentX, 0);
        ctx.lineTo(currentX, height);
        ctx.strokeStyle = 'black';
        ctx.lineWidth = 2;
        ctx.stroke();
    }

    document.addEventListener('click', (e) => {
        const ignoredTags = ['BUTTON', 'INPUT', 'TEXTAREA', 'CANVAS'];
        const clickedInsideDial = e.target.closest('.dial');
        const clickedControl = ignoredTags.includes(e.target.tagName);

        if (!clickedInsideDial && !clickedControl && selectedDial !== null) {
            selectedDial = null;
            document.querySelectorAll('.dial').forEach(el => el.classList.remove('selected'));
            drawTimelineMarkers();
        }
    });

    canvas.addEventListener('mousedown', (e) => {
        const x = e.offsetX;
        const frame = Math.round((x / canvas.width) * totalFrames);

        const dialIndices = selectedDial !== null ? [selectedDial] : [0, 1, 2, 3, 4];

        for (let ch of dialIndices) {
            for (let f in dialKeyframes[ch]) {
                const fx = (f / totalFrames) * canvas.width;
                if (Math.abs(fx - x) < 5) {
                    draggingKeyframe = { dialIndex: ch, originalFrame: parseInt(f) };
                    isDragging = true;
                    return;
                }
            }
        }
    });

    canvas.addEventListener('mousemove', (e) => {
        if (!isDragging || !draggingKeyframe) return;

        const x = e.offsetX;
        const newFrame = Math.max(0, Math.min(totalFrames - 1, Math.round((x / canvas.width) * totalFrames)));

        const { dialIndex, originalFrame } = draggingKeyframe;
        const value = dialKeyframes[dialIndex][originalFrame];

        if (newFrame !== originalFrame) {
            delete dialKeyframes[dialIndex][originalFrame];
            dialKeyframes[dialIndex][newFrame] = value;
            draggingKeyframe.originalFrame = newFrame;
            drawTimelineMarkers();
        }
    });


    canvas.addEventListener('mouseup', () => {
        isDragging = false;
        draggingKeyframe = null;
    });

    canvas.addEventListener('dblclick', (e) => {
        const x = e.offsetX;
        const frame = Math.round((x / canvas.width) * totalFrames);
        const dialIndices = selectedDial !== null ? [selectedDial] : [0, 1, 2, 3, 4];

        for (let ch of dialIndices) {
            if (dialKeyframes[ch][frame] !== undefined) {
                delete dialKeyframes[ch][frame];
                drawTimelineMarkers();
            }
        }
    });



    document.getElementById('saveAnimation').onclick = async () => {


    };

    drawTimelineMarkers();
};