{% extends "base.html" %}

{% block title %}Encode 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-lock-fill me-2"></i>Encode Secret Message</h5>
            </div>
            <div class="card-body">
                <form method="POST" enctype="multipart/form-data" id="encodeForm">
                    <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" id="refDropZone">
                                <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" id="refPreview">
                            </div>
                            <div class="form-text">
                                The secret photo both parties have (NOT transmitted)
                            </div>
                        </div>
                        
                        <div class="col-md-6 mb-3">
                            <label class="form-label">
                                <i class="bi bi-file-image me-1"></i> Carrier Image
                            </label>
                            <div class="drop-zone" id="carrierDropZone">
                                <input type="file" name="carrier" 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" id="carrierPreview">
                            </div>
                            <div class="form-text">
                                The image to hide your message in (e.g., a meme)
                            </div>
                        </div>
                    </div>
                    
                    <div class="mb-3">
                        <label class="form-label">
                            <i class="bi bi-chat-left-text me-1"></i> Secret Message
                        </label>
                        <textarea name="message" class="form-control" rows="4" id="messageInput"
                                  placeholder="Enter your secret message here..." required></textarea>
                        <div class="d-flex justify-content-between form-text">
                            <span>
                                <span id="charCount">0</span> / 50,000 characters
                                <span id="charWarning" class="text-warning d-none ms-2">
                                    <i class="bi bi-exclamation-triangle"></i> Getting long!
                                </span>
                            </span>
                            <span id="charPercent" class="text-muted">0%</span>
                        </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_of_week }}'s Phrase
                            </label>
                            <input type="text" name="day_phrase" class="form-control" 
                                   placeholder="e.g., correct horse battery" required>
                            <div class="form-text">
                                Your phrase for <strong>today</strong> (based on your local timezone)
                            </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="encodeBtn">
                        <i class="bi bi-lock me-2"></i>Encode Message
                    </button>
                </form>
                
                <hr class="my-4">
                
                <div class="row text-center text-muted small">
                    <div class="col-4">
                        <i class="bi bi-shield-check fs-4 d-block mb-1 text-success"></i>
                        AES-256-GCM Encryption
                    </div>
                    <div class="col-4">
                        <i class="bi bi-shuffle fs-4 d-block mb-1 text-info"></i>
                        Random Pixel Embedding
                    </div>
                    <div class="col-4">
                        <i class="bi bi-eye-slash fs-4 d-block mb-1 text-warning"></i>
                        Undetectable by Analysis
                    </div>
                </div>
                
                <div class="alert alert-secondary mt-4 small">
                    <i class="bi bi-info-circle me-1"></i>
                    <strong>Limits:</strong> 
                    Carrier image max ~4 megapixels (2000×2000). 
                    Files max 5MB each. 
                    Message max 50KB.
                </div>
            </div>
        </div>
    </div>
</div>
{% endblock %}

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

// Character counter
const messageInput = document.getElementById('messageInput');
const charCount = document.getElementById('charCount');
const charWarning = document.getElementById('charWarning');
const charPercent = document.getElementById('charPercent');
const maxChars = 50000;

messageInput.addEventListener('input', function() {
    const len = this.value.length;
    charCount.textContent = len.toLocaleString();
    
    const pct = Math.round((len / maxChars) * 100);
    charPercent.textContent = pct + '%';
    
    // Warning at 80%
    charWarning.classList.toggle('d-none', len < maxChars * 0.8);
    
    // Red text when near/over limit
    charCount.classList.toggle('text-danger', len > maxChars * 0.95);
});

// 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 %}