{% extends 'base.html' %}
{% load static i18n%}

{% block content %}
<div class="container my-4">
    <h3 class="mb-4">{{ _("Scan Vehicle Code")}}</h3>

    <form id="car-form" class="mb-3">
        <div class="mb-3">
            <label for="vin_no" class="form-label">{{ _("VIN / Barcode / QR Code")}}</label>
            <input type="text" class="form-control" id="vin_no" name="vin_no" readonly>
        </div>
        <div class="d-flex gap-2">
            <button type="button" class="btn btn-primary" id="capture-btn">{{ _("Start Scanning")}}</button>
            <button type="submit" class="btn btn-success">{{ _("Search") }}</button>
        </div>
    </form>

    <div id="camera-container" class="my-3" style="display:none;">
        <video id="camera" class="border rounded" autoplay playsinline width="100%"></video>
        <div class="mt-2 d-flex gap-2">
            <button class="btn btn-warning" id="toggle-btn">{{ _("Switch Camera")}}</button>
            <button class="btn btn-info" id="scan-btn">{{ _("Scan") }}</button>
        </div>
    </div>

    <div id="result" class="alert mt-3" style="display:none;"></div>
</div>

<script>
    function getCookie(name) {
        let cookieValue = null;
        if (document.cookie && document.cookie !== '') {
            const cookies = document.cookie.split(';');
            for (let cookie of cookies) {
                cookie = cookie.trim();
                if (cookie.startsWith(name + '=')) {
                    cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                    break;
                }
            }
        }
        return cookieValue;
    }

    const captureBtn = document.getElementById('capture-btn');
    const cameraContainer = document.getElementById('camera-container');
    const videoElement = document.getElementById('camera');
    const toggleBtn = document.getElementById('toggle-btn');
    const scanBtn = document.getElementById('scan-btn');
    const vinInput = document.getElementById('vin_no');
    const resultElement = document.getElementById('result');
    const form = document.getElementById('car-form');

    let mediaStream = null;
    let currentCameraIndex = 0;
    let cameras = [];

    form.addEventListener('submit', function (e) {
        e.preventDefault(); // Prevent form reload
    });

    async function getCameras() {
        const devices = await navigator.mediaDevices.enumerateDevices();
        cameras = devices.filter(device => device.kind === 'videoinput');
    }

    async function startCamera(deviceId) {
        if (mediaStream) {
            mediaStream.getTracks().forEach(track => track.stop());
        }

        mediaStream = await navigator.mediaDevices.getUserMedia({
            video: { deviceId: { exact: deviceId } }
        });

        videoElement.srcObject = mediaStream;
    }

    toggleBtn.addEventListener('click', async () => {
        if (cameras.length > 1) {
            currentCameraIndex = (currentCameraIndex + 1) % cameras.length;
            await startCamera(cameras[currentCameraIndex].deviceId);
        }
    });

    scanBtn.addEventListener('click', () => {
        resultElement.style.display = 'block';
        resultElement.className = 'alert alert-secondary';
        resultElement.textContent = 'Scanning...';

        const canvas = document.createElement('canvas');
        canvas.width = videoElement.videoWidth;
        canvas.height = videoElement.videoHeight;
        const context = canvas.getContext('2d');
        context.drawImage(videoElement, 0, 0, canvas.width, canvas.height);

        canvas.toBlob((blob) => {
            const formData = new FormData();
            formData.append('image', blob, 'code_image.jpg');

            fetch('{% url "car_search" %}', {
                method: 'POST',
                headers: {
                    "X-Requested-With": "XMLHttpRequest",
                    'X-CSRFToken': getCookie('csrftoken')
                },
                body: formData
            })
            .then(response => response.json())
            .then(data => {
                if (data.success) {
                    if (data.redirect_url) {
                        window.location.href = data.redirect_url;
                    } else {
                        vinInput.value = data.code;
                        resultElement.className = 'alert alert-success';
                        resultElement.textContent = `Code found: ${data.code}`;
                    }
                } else {
                    resultElement.className = 'alert alert-danger';
                    resultElement.textContent = `Error: ${data.error}`;
                }
            })
            .catch(err => {
                resultElement.className = 'alert alert-danger';
                resultElement.textContent = 'Unexpected error occurred.';
                console.error(err);
            })
            .finally(() => {
                stopCamera();
            });
        });
    });

    captureBtn.addEventListener('click', async () => {
        cameraContainer.style.display = 'block';
        await getCameras();
        if (cameras.length > 0) {
            await startCamera(cameras[currentCameraIndex].deviceId);
        } else {
            resultElement.className = 'alert alert-warning';
            resultElement.textContent = 'No cameras found.';
            resultElement.style.display = 'block';
        }
    });

    function stopCamera() {
        if (mediaStream) {
            mediaStream.getTracks().forEach(track => track.stop());
            mediaStream = null;
        }
        cameraContainer.style.display = 'none';
    }
</script>
{% endblock content %}