const video = document.getElementById('videoFeed');
const empIdInput = document.getElementById('empId');
const empNameInput = document.getElementById('empName');
const btnRegister = document.getElementById('btnRegister');
const statusText = document.getElementById('statusText');
const progressCircle = document.getElementById('progressCircle');
const spoofToast = document.getElementById('spoofToast');
const spoofToastMessage = document.getElementById('spoofToastMessage');

let capturedFrames = [];
let isCapturing = false;
const REQUIRED_FRAMES = 5;
let toastDismissTimer = null;

// Start Camera
navigator.mediaDevices.getUserMedia({ video: { facingMode: 'user', width: 640, height: 480 } })
    .then(stream => { video.srcObject = stream; })
    .catch(err => console.error(err));

// Monitor inputs to enable capture
[empIdInput, empNameInput].forEach(input => {
    input.addEventListener('input', checkInputs);
});

function checkInputs() {
    const valid = empIdInput.value.trim().length > 0 && empNameInput.value.trim().length > 0;
    if (valid && !isCapturing && capturedFrames.length === 0) {
        btnRegister.disabled = false;
        btnRegister.textContent = "START CAPTURE";
        btnRegister.onclick = startCaptureProcess;
    } else if (capturedFrames.length === REQUIRED_FRAMES) {
        btnRegister.disabled = false;
        btnRegister.textContent = "Register";
        btnRegister.onclick = submitRegistration;
    } else {
        btnRegister.disabled = true;
    }
}

function startCaptureProcess() {
    isCapturing = true;
    btnRegister.disabled = true;
    capturedFrames = [];
    statusText.textContent = "Keep face steady...";
    
    let count = 0;
    const interval = setInterval(() => {
        if (count >= REQUIRED_FRAMES) {
            clearInterval(interval);
            finishCapture();
            return;
        }
        
        const canvas = document.createElement('canvas');
        canvas.width = video.videoWidth;
        canvas.height = video.videoHeight;
        canvas.getContext('2d').drawImage(video, 0, 0);
        capturedFrames.push(canvas.toDataURL('image/jpeg', 0.8));
        
        count++;
        updateProgress(count / REQUIRED_FRAMES);
        statusText.textContent = `Scanning... ${Math.round((count/REQUIRED_FRAMES)*100)}%`;
        
    }, 600);
}

function updateProgress(percent) {
    const offset = 113 - (113 * percent);
    progressCircle.style.strokeDashoffset = offset;
}

function finishCapture() {
    isCapturing = false;
    statusText.textContent = "Face captured ✓";
    statusText.style.color = "var(--color-primary)";
    checkInputs(); // Re-enable button for submit
}

async function submitRegistration() {
    btnRegister.disabled = true;
    btnRegister.textContent = "REGISTERING...";
    
    const payload = {
        employee_id: empIdInput.value.trim(),
        name: empNameInput.value.trim(),
        frames: capturedFrames
    };
    
    try {
        const res = await fetch('/api/register', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(payload)
        });
        
        const data = await res.json();

        if (data.status === 'registered') {
            document.getElementById('registerForm').style.display = 'none';
            document.getElementById('successState').style.display = 'block';
            document.getElementById('successChip').textContent = `${payload.name} — ${payload.employee_id}`;
        } else if (data.status === 'spoof') {
            showSpoofToast(data);
            btnRegister.disabled = false;
            btnRegister.textContent = "Register";
        } else {
            // Duplicate user or other error → snackbar
            var msg = data.message || "Unknown error";
            if (msg.indexOf("already registered") !== -1 || msg.indexOf("already registered to") !== -1) {
                if (typeof showSnackbar === 'function') showSnackbar("Duplicate registration — this face is already registered.", 'error');
            } else if (msg.indexOf("No face detected") !== -1 || msg.indexOf("no face") !== -1) {
                if (typeof showSnackbar === 'function') showSnackbar("Clear photo — ensure your face is visible and well lit.", 'info');
            } else {
                if (typeof showSnackbar === 'function') showSnackbar(msg, 'error');
            }
            btnRegister.disabled = false;
            btnRegister.textContent = "Register";
        }
    } catch (e) {
        if (typeof showSnackbar === 'function') showSnackbar("Network error. Please try again.", 'error');
        btnRegister.disabled = false;
        btnRegister.textContent = "Register";
    }
}

function showSpoofToast(data) {
    const msg = data.reason || data.message || "Use a live face, not a photo or screen.";
    spoofToastMessage.textContent = msg;
    spoofToast.classList.add('show');
    if (toastDismissTimer) clearTimeout(toastDismissTimer);
    toastDismissTimer = setTimeout(() => {
        spoofToast.classList.remove('show');
        toastDismissTimer = null;
    }, 4500);
}