{% extends "base.html" %}

{% block title %}Decode Message - Stegasoo{% endblock %}

{% block content %}
<div class="row justify-content-center">
    <div class="col-lg-8">
        <div class="card">
            <div class="card-header">
                <h5 class="mb-0"><i class="bi bi-unlock-fill me-2"></i>Decode Secret Message</h5>
            </div>
            <div class="card-body">
                {% if decoded_message %}
                <div class="alert alert-success">
                    <h6><i class="bi bi-check-circle me-2"></i>Message Decrypted Successfully!</h6>
                </div>
                
                <div class="mb-4">
                    <label class="form-label text-muted">Decoded Message:</label>
                    <div class="alert-message">{{ decoded_message }}</div>
                </div>
                
                <a href="/decode" class="btn btn-outline-light w-100">
                    <i class="bi bi-arrow-repeat me-2"></i>Decode Another Message
                </a>
                
                {% else %}
                
                <form method="POST" enctype="multipart/form-data" id="decodeForm">
                    <div class="row">
                        <div class="col-md-6 mb-3">
                            <label class="form-label">
                                <i class="bi bi-image me-1"></i> Reference Photo
                            </label>
                            <div class="drop-zone">
                                <input type="file" name="reference_photo" accept="image/*" required>
                                <div class="drop-zone-label">
                                    <i class="bi bi-cloud-arrow-up fs-3 d-block mb-2 text-muted"></i>
                                    <span class="text-muted">Drop image or click to browse</span>
                                </div>
                                <img class="drop-zone-preview d-none">
                            </div>
                            <div class="form-text">
                                The same reference photo used for encoding
                            </div>
                        </div>
                        
                        <div class="col-md-6 mb-3">
                            <label class="form-label">
                                <i class="bi bi-file-earmark-image me-1"></i> Stego Image
                            </label>
                            <div class="drop-zone">
                                <input type="file" name="stego_image" accept="image/*" required>
                                <div class="drop-zone-label">
                                    <i class="bi bi-cloud-arrow-up fs-3 d-block mb-2 text-muted"></i>
                                    <span class="text-muted">Drop image or click to browse</span>
                                </div>
                                <img class="drop-zone-preview d-none">
                            </div>
                            <div class="form-text">
                                The image containing the hidden message
                            </div>
                        </div>
                    </div>
                    
                    <div class="row">
                        <div class="col-md-8 mb-3">
                            <label class="form-label">
                                <i class="bi bi-chat-quote me-1"></i> Day Phrase
                            </label>
                            <input type="text" name="day_phrase" class="form-control" 
                                   placeholder="e.g., correct horse battery" required>
                            <div class="form-text">
                                The phrase for the day the message was encoded
                            </div>
                        </div>
                        
                        <div class="col-md-4 mb-3">
                            <label class="form-label">
                                <i class="bi bi-123 me-1"></i> PIN
                            </label>
                            <input type="password" name="pin" class="form-control" 
                                   placeholder="123456" maxlength="10">
                            <div class="form-text">
                                Your static 6-digit PIN
                            </div>
                        </div>
                    </div>
                    
                    <button type="submit" class="btn btn-primary btn-lg w-100" id="decodeBtn">
                        <i class="bi bi-unlock me-2"></i>Decode Message
                    </button>
                </form>
                
                {% endif %}
            </div>
        </div>
        
        <div class="card mt-4">
            <div class="card-body">
                <h6 class="text-muted mb-3"><i class="bi bi-question-circle me-2"></i>Troubleshooting</h6>
                <ul class="list-unstyled text-muted small mb-0">
                    <li class="mb-2">
                        <i class="bi bi-dot"></i>
                        Make sure you're using the <strong>exact same reference photo</strong> file
                    </li>
                    <li class="mb-2">
                        <i class="bi bi-dot"></i>
                        Use the phrase for the <strong>day the message was encoded</strong>, not today
                    </li>
                    <li class="mb-2">
                        <i class="bi bi-dot"></i>
                        Ensure the stego image hasn't been <strong>resized or recompressed</strong>
                    </li>
                    <li class="mb-0">
                        <i class="bi bi-dot"></i>
                        Double-check your <strong>PIN</strong> is correct
                    </li>
                </ul>
            </div>
        </div>
    </div>
</div>
{% endblock %}

{% block scripts %}
<script>
// Form submit loading state
document.getElementById('decodeForm')?.addEventListener('submit', function() {
    const btn = document.getElementById('decodeBtn');
    btn.innerHTML = '<span class="spinner-border spinner-border-sm me-2"></span>Decoding...';
    btn.disabled = true;
});

// Drag & drop with preview
document.querySelectorAll('.drop-zone').forEach(zone => {
    const input = zone.querySelector('input[type="file"]');
    const label = zone.querySelector('.drop-zone-label');
    const preview = zone.querySelector('.drop-zone-preview');
    
    // Drag events
    ['dragenter', 'dragover'].forEach(evt => {
        zone.addEventListener(evt, e => {
            e.preventDefault();
            zone.classList.add('drag-over');
        });
    });
    
    ['dragleave', 'drop'].forEach(evt => {
        zone.addEventListener(evt, e => {
            e.preventDefault();
            zone.classList.remove('drag-over');
        });
    });
    
    // Handle drop
    zone.addEventListener('drop', e => {
        if (e.dataTransfer.files.length) {
            input.files = e.dataTransfer.files;
            showPreview(e.dataTransfer.files[0]);
        }
    });
    
    // Handle click selection
    input.addEventListener('change', function() {
        if (this.files && this.files[0]) {
            showPreview(this.files[0]);
        }
    });
    
    function showPreview(file) {
        if (!file.type.startsWith('image/')) return;
        
        const reader = new FileReader();
        reader.onload = e => {
            preview.src = e.target.result;
            preview.classList.remove('d-none');
            label.innerHTML = '<i class="bi bi-check-circle text-success me-1"></i>' + file.name;
        };
        reader.readAsDataURL(file);
    }
});
</script>
{% endblock %}