{% extends "base.html" %}
{% block title %}
ZXing Barcode Scanner
{% endblock %}

{% block content %}
<div class="container text-center">
    <h1 class="mb-4">📷 ZXing Barcode Scanner</h1>

    <div class="mb-3">
        <video id="video" class="border rounded shadow-sm" width="100%" style="max-width: 500px;"></video>
    </div>

    <div class="mb-3">
        <button id="startButton" class="btn btn-primary">Start Scanning</button>
        <button id="stopButton" class="btn btn-danger ms-2">Stop</button>
    </div>

    <div>
        <h5>Result:</h5>
        <p id="result" class="fw-bold text-success"></p>
    </div>
</div>

<script type="module">
    import { BrowserMultiFormatReader } from 'https://cdn.jsdelivr.net/npm/@zxing/library@0.21.3/+esm';

    const codeReader = new BrowserMultiFormatReader();
    const videoElement = document.getElementById('video');
    const resultElement = document.getElementById('result');

    document.getElementById('startButton').addEventListener('click', async () => {
        await navigator.mediaDevices.getUserMedia({ video: true });
        console.log('[DEBUG] Start button clicked');
        const devices = await codeReader.listVideoInputDevices();
        console.log('[DEBUG] Cameras found:', devices);
        const selectedDeviceId = devices[0]?.deviceId;
        if (!selectedDeviceId) {
            alert('No camera found!');
            return;
        }
        codeReader.decodeFromVideoDevice(selectedDeviceId, videoElement, (result, err, controls) => {
            if (result) {
                resultElement.textContent = result.getText();
                controls.stop();
            }
        });
    });

    document.getElementById('stopButton').addEventListener('click', () => {
        codeReader.reset();
        resultElement.textContent = '';
    });
</script>
{% endblock %}