{% extends "base.html" %}

{% block title %}{{ 'scan_qr'|t }} - NetEvents{% endblock %}

{% block content %}
<div class="scan-page">
    <div class="scan-header">
        <h1>{{ 'scan_attendee'|t }}</h1>
        <p>{{ 'scan_qr_description'|t }}</p>
        <a href="{{ url_for('attendee_dashboard') }}" class="btn btn-outline">{{ 'back_to_dashboard'|t }}</a>
    </div>

    <div class="scanner-container">
        <div id="qr-reader" class="qr-reader"></div>
        <div id="scan-result" class="scan-result hidden">
            <div class="result-icon" id="result-icon"></div>
            <h2 id="result-title"></h2>
            <p id="result-message"></p>
            <button id="scan-again" class="btn btn-primary">{{ 'scan_again'|t }}</button>
        </div>
    </div>

    <div class="scan-info">
        <p>{{ 'scan_info_text'|t }}</p>
        <p><strong>{{ 'scan_info_warning'|t }}</strong></p>
    </div>
</div>

<style>
.scan-page {
    max-width: 600px;
    margin: 0 auto;
}

.scan-header {
    text-align: center;
    margin-bottom: 20px;
}

.scan-header h1 {
    margin-bottom: 5px;
}

.scan-header p {
    color: #666;
    margin-bottom: 15px;
}

.scanner-container {
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.qr-reader {
    width: 100%;
}

.qr-reader video {
    width: 100% !important;
    border-radius: 12px;
}

.scan-result {
    text-align: center;
    padding: 40px 20px;
    background: #fff;
    width: 100%;
}

.scan-result.hidden {
    display: none;
}

.result-icon {
    font-size: 64px;
    margin-bottom: 10px;
}

.result-icon.success::before {
    content: '✓';
    color: #22c55e;
}

.result-icon.pending::before {
    content: '⏳';
    color: #f59e0b;
}

.result-icon.error::before {
    content: '✗';
    color: #ef4444;
}

.result-icon.info::before {
    content: 'ℹ';
    color: #3b82f6;
}

#result-title {
    margin: 0 0 10px 0;
}

#result-message {
    color: #666;
    margin-bottom: 20px;
}

.scan-info {
    background: #f8fafc;
    border-radius: 12px;
    padding: 20px;
    margin-top: 20px;
    text-align: center;
}

.scan-info p {
    margin: 10px 0;
    color: #64748b;
}

.scan-info strong {
    color: #1e293b;
}
</style>

<script src="https://unpkg.com/html5-qrcode@2.3.8/html5-qrcode.min.js"></script>
<script>
const myId = {{ session.user_id }};
const myEventId = {{ session.event_id }};
let html5QrCode;
let scanning = true;

async function sendConnectionRequest(scannedId) {
    try {
        const response = await fetch('/attendee/scan-request', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ scanned_id: scannedId })
        });

        const data = await response.json();
        const resultDiv = document.getElementById('scan-result');
        const icon = document.getElementById('result-icon');
        const title = document.getElementById('result-title');
        const message = document.getElementById('result-message');

        icon.className = 'result-icon';

        if (data.success) {
            document.getElementById('qr-reader').style.display = 'none';
            resultDiv.classList.remove('hidden');
            icon.classList.add('pending');
            title.textContent = '{{ "request_sent"|t }}';
            message.textContent = '{{ "request_sent_message"|t }}';
        } else {
            document.getElementById('qr-reader').style.display = 'none';
            resultDiv.classList.remove('hidden');
            icon.classList.add('error');
            title.textContent = '{{ "error"|t }}';
            message.textContent = data.error || '{{ "failed_send_request"|t }}';
        }

        scanning = false;
    } catch (error) {
        console.error('Connection error:', error);
        alert('Error sending connection request');
    }
}

function onScanSuccess(decodedText) {
    if (!scanning) return;

    // Expected format: "NETEVENT:{event_id}:{attendee_id}"
    const parts = decodedText.split(':');
    if (parts.length === 3 && parts[0] === 'NETEVENT') {
        const eventId = parseInt(parts[1]);
        const attendeeId = parseInt(parts[2]);

        if (eventId === myEventId) {
            if (attendeeId === myId) {
                alert('{{ "cannot_scan_own_qr"|t }}');
                return;
            }
            sendConnectionRequest(attendeeId);
        } else {
            alert('{{ "qr_different_event"|t }}');
        }
    } else {
        console.log('Unknown QR format:', decodedText);
        alert('{{ "unrecognized_qr"|t }}');
    }
}

function startScanner() {
    html5QrCode = new Html5Qrcode("qr-reader");

    html5QrCode.start(
        { facingMode: "environment" },
        {
            fps: 10,
            qrbox: { width: 250, height: 250 }
        },
        onScanSuccess,
        (errorMessage) => {
            // Ignore scan errors
        }
    ).catch(err => {
        console.error('Camera error:', err);
        alert('{{ "camera_permission_error"|t }}');
    });
}

function resetScanner() {
    document.getElementById('qr-reader').style.display = 'block';
    document.getElementById('scan-result').classList.add('hidden');
    scanning = true;
}

document.getElementById('scan-again').addEventListener('click', resetScanner);

window.addEventListener('DOMContentLoaded', startScanner);
</script>
{% endblock %}