{% extends "base.html" %}

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

{% block content %}
<style>
/* Glowing passphrase input */
.passphrase-input-container {
    position: relative;
}

.passphrase-input {
    background: rgba(30, 40, 50, 0.8) !important;
    border: 2px solid rgba(99, 179, 237, 0.3) !important;
    color: #63b3ed !important;
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    letter-spacing: 0.5px;
    padding: 12px 16px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}

.passphrase-input:focus {
    border-color: rgba(99, 179, 237, 0.8) !important;
    box-shadow: 0 0 20px rgba(99, 179, 237, 0.4), 0 0 40px rgba(99, 179, 237, 0.2) !important;
    background: rgba(30, 40, 50, 0.95) !important;
}

.passphrase-input::placeholder {
    color: rgba(99, 179, 237, 0.4);
}

/* Glowing PIN input */
.pin-input-container .form-control {
    background: rgba(30, 40, 50, 0.8) !important;
    border: 2px solid rgba(246, 173, 85, 0.3) !important;
    color: #f6ad55 !important;
    font-family: 'Courier New', monospace;
    font-size: 1.2rem;
    letter-spacing: 3px;
    text-align: center;
    transition: all 0.3s ease;
}

.pin-input-container .form-control:focus {
    border-color: rgba(246, 173, 85, 0.8) !important;
    box-shadow: 0 0 20px rgba(246, 173, 85, 0.4), 0 0 40px rgba(246, 173, 85, 0.2) !important;
    background: rgba(30, 40, 50, 0.95) !important;
}

.pin-input-container .form-control::placeholder {
    color: rgba(246, 173, 85, 0.4);
    letter-spacing: 1px;
}

/* QR Crop Animation */
.qr-crop-container {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.3);
}

.qr-crop-container img {
    display: block;
    max-height: 180px;
    max-width: 180px;
    width: auto;
    margin: 0 auto;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.qr-crop-container .qr-original {
    opacity: 1;
}

.qr-crop-container .qr-cropped {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.3);
    opacity: 0;
    max-height: 160px;
    min-width: 140px;
    min-height: 140px;
    object-fit: contain;
}

.qr-crop-container.scan-complete .qr-original {
    opacity: 0;
    transform: scale(1.1);
    filter: blur(4px);
}

.qr-crop-container.scan-complete .qr-cropped {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

.qr-crop-container .crop-badge {
    position: absolute;
    bottom: 4px;
    right: 4px;
    font-size: 0.65rem;
    opacity: 0;
    transition: opacity 0.3s ease 0.4s;
}

.qr-crop-container.scan-complete .crop-badge {
    opacity: 1;
}
</style>

<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 or File</h5>
            </div>
            <div class="card-body">
                <form method="POST" enctype="multipart/form-data" id="encodeForm">
                    <!-- Removed client_date hidden field -->
                    
                    <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 scan-container" 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">
                                <!-- Scan overlay elements -->
                                <div class="scan-overlay">
                                    <div class="scan-grid"></div>
                                    <div class="scan-line"></div>
                                </div>
                                <!-- Corner brackets (shown after scan) -->
                                <div class="scan-corners">
                                    <div class="scan-corner tl"></div>
                                    <div class="scan-corner tr"></div>
                                    <div class="scan-corner bl"></div>
                                    <div class="scan-corner br"></div>
                                </div>
                                <!-- Data panel (shown after scan) -->
                                <div class="scan-data-panel">
                                    <div class="scan-data-filename">
                                        <i class="bi bi-check-circle-fill"></i>
                                        <span id="refFileName">image.jpg</span>
                                    </div>
                                    <div class="scan-data-row">
                                        <span class="scan-status-badge">Hash Acquired</span>
                                        <span class="scan-data-value" id="refFileSize">--</span>
                                    </div>
                                    <div class="scan-hash-preview" id="refHashPreview">SHA256: ················</div>
                                </div>
                            </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 pixel-container" id="carrierDropZone">
                                <input type="file" name="carrier" accept="image/*" required id="carrierInput">
                                <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">
                                <!-- Pixel blocks overlay - populated by JS -->
                                <div class="pixel-blocks"></div>
                                <!-- Pixel scan line -->
                                <div class="pixel-scan-line"></div>
                                <!-- Corner brackets -->
                                <div class="pixel-corners">
                                    <div class="pixel-corner tl"></div>
                                    <div class="pixel-corner tr"></div>
                                    <div class="pixel-corner bl"></div>
                                    <div class="pixel-corner br"></div>
                                </div>
                                <!-- Data panel -->
                                <div class="pixel-data-panel">
                                    <div class="pixel-data-filename">
                                        <i class="bi bi-check-circle-fill"></i>
                                        <span id="carrierFileName">image.jpg</span>
                                    </div>
                                    <div class="pixel-data-row">
                                        <span class="pixel-status-badge">Carrier Loaded</span>
                                        <span class="pixel-data-value" id="carrierFileSize">--</span>
                                    </div>
                                    <div class="pixel-dimensions" id="carrierDims">-- × -- px</div>
                                </div>
                            </div>
                            <div class="form-text">
                                The image to hide your message in (e.g., a meme)
                            </div>
                        </div>
                    </div>
                    
                    <!-- Capacity Info Panel (shown when carrier loaded) -->
                    <div class="alert alert-info small d-none" id="capacityPanel">
                        <div class="row align-items-center">
                            <div class="col">
                                <i class="bi bi-rulers me-1"></i>
                                <strong>Carrier:</strong> <span id="carrierDimensions">-</span>
                            </div>
                            <div class="col-auto">
                                <span class="badge bg-warning text-dark me-1" id="dctCapacityBadge">DCT: -</span>
                                <span class="badge bg-primary" id="lsbCapacityBadge">LSB: -</span>
                            </div>
                        </div>
                    </div>
                    
                    <!-- Embedding Mode Selection -->
                    <div class="mb-4">
                        <label class="form-label">
                            <i class="bi bi-cpu me-1"></i> Embedding Mode
                        </label>
                        
                        <div class="d-flex gap-2">
                            <!-- DCT Mode -->
                            <label class="mode-btn flex-fill {% if not has_dct %}opacity-50{% endif %} {% if has_dct %}active{% endif %}" id="dctModeCard" for="modeDct">
                                <input class="form-check-input" type="radio" name="embed_mode" id="modeDct" value="dct" {% if has_dct %}checked{% endif %} {% if not has_dct %}disabled{% endif %}>
                                <i class="bi bi-soundwave text-warning ms-2"></i>
                                <span class="ms-2"><strong>DCT</strong> <span class="text-muted">· Social Media</span></span>
                                <i class="bi bi-info-circle text-muted mode-info-icon ms-2" data-bs-toggle="tooltip" data-bs-html="true" title="<b>DCT Mode</b><br>• JPEG output<br>• Survives recompression<br>• ~75 KB/MP capacity"></i>
                                {% if not has_dct %}
                                <span class="small text-warning ms-2"><i class="bi bi-exclamation-triangle me-1"></i>Requires scipy</span>
                                {% endif %}
                            </label>
                            
                            <!-- LSB Mode -->
                            <label class="mode-btn flex-fill {% if not has_dct %}active{% endif %}" id="lsbModeCard" for="modeLsb">
                                <input class="form-check-input" type="radio" name="embed_mode" id="modeLsb" value="lsb" {% if not has_dct %}checked{% endif %}>
                                <i class="bi bi-grid-3x3-gap text-primary ms-2"></i>
                                <span class="ms-2"><strong>LSB</strong> <span class="text-muted">· Email & Files</span></span>
                                <i class="bi bi-info-circle text-muted mode-info-icon ms-2" data-bs-toggle="tooltip" data-bs-html="true" title="<b>LSB Mode</b><br>• Full color PNG output<br>• Higher capacity (~375 KB/MP)"></i>
                            </label>
                        </div>
                    </div>
                    
                    <!-- Payload Type Selector -->
                    <div class="mb-3">
                        <label class="form-label">
                            <i class="bi bi-box me-1"></i> What to Encode
                        </label>
                        <div class="btn-group w-100" role="group">
                            <input type="radio" class="btn-check" name="payload_type" id="payloadText" value="text" checked>
                            <label class="btn btn-outline-primary" for="payloadText">
                                <i class="bi bi-chat-left-text me-1"></i> Text Message
                            </label>
                            
                            <input type="radio" class="btn-check" name="payload_type" id="payloadFile" value="file">
                            <label class="btn btn-outline-primary" for="payloadFile">
                                <i class="bi bi-file-earmark me-1"></i> File
                            </label>
                        </div>
                    </div>
                    
                    <!-- Text Message Input -->
                    <div class="mb-3" id="textPayloadSection">
                        <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..."></textarea>
                        <div class="d-flex justify-content-between form-text">
                            <span>
                                <span id="charCount">0</span> / 250,000 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>
                    
                    <!-- File Upload Input -->
                    <div class="mb-3 d-none" id="filePayloadSection">
                        <label class="form-label">
                            <i class="bi bi-file-earmark me-1"></i> File to Embed
                        </label>
                        <div class="drop-zone" id="payloadDropZone">
                            <input type="file" name="payload_file" id="payloadFileInput">
                            <div class="drop-zone-label" id="payloadDropLabel">
                                <i class="bi bi-cloud-arrow-up fs-3 d-block mb-2 text-muted"></i>
                                <span class="text-muted">Drop any file or click to browse</span>
                                <div class="small text-muted mt-1">Max {{ max_payload_kb }} KB</div>
                            </div>
                        </div>
                        <div class="form-text">
                            Supports any file type: PDF, ZIP, documents, etc.
                        </div>
                        <div id="fileInfo" class="d-none mt-2 p-2 bg-dark rounded">
                            <i class="bi bi-file-earmark-check text-success me-2"></i>
                            <span id="fileInfoName"></span>
                            <span class="text-muted">(<span id="fileInfoSize"></span>)</span>
                        </div>
                    </div>
                    
                    <!-- Passphrase input with glow styling -->
                    <div class="mb-3">
                        <label class="form-label" id="passphraseLabel">
                            <i class="bi bi-chat-quote me-1"></i> Passphrase
                        </label>
                        <div class="passphrase-input-container">
                            <input type="text" name="passphrase" class="form-control passphrase-input" 
                                   placeholder="e.g., apple forest thunder mountain" required
                                   id="passphraseInput">
                        </div>
                        <div class="form-text">
                            Your passphrase for this message
                        </div>
                        <div class="form-text mt-1" id="passphraseWarning" style="display: none;">
                            <i class="bi bi-exclamation-triangle text-warning me-1"></i>
                            Passphrase should have at least {{ recommended_passphrase_words }} words for good security
                        </div>
                    </div>
                    
                    <hr class="my-4">
                    
                    <h6 class="text-muted mb-3">
                        SECURITY FACTORS 
                        <span class="text-warning small">(provide at least one: PIN or RSA Key)</span>
                    </h6>
                    
                    <div class="mb-3">
                      <div class="security-box">
                        <label class="form-label">
                            <i class="bi bi-file-earmark-lock me-1"></i> RSA Key
                        </label>

                        <!-- RSA Input Method Toggle -->
                        <div class="btn-group w-100 mb-2" role="group">
                            <input type="radio" class="btn-check" name="rsa_input_method" id="rsaMethodFile" value="file" checked>
                            <label class="btn btn-outline-secondary btn-sm" for="rsaMethodFile">
                                <i class="bi bi-file-earmark me-1"></i>.pem File
                            </label>

                            <input type="radio" class="btn-check" name="rsa_input_method" id="rsaMethodQr" value="qr">
                            <label class="btn btn-outline-secondary btn-sm" for="rsaMethodQr">
                                <i class="bi bi-qr-code me-1"></i>QR Code
                            </label>
                        </div>

                        <!-- .pem File Input -->
                        <div id="rsaFileSection">
                            <input type="file" name="rsa_key" class="form-control form-control-sm" accept=".pem">
                        </div>

                        <!-- QR Code Input -->
                        <div id="rsaQrSection" class="d-none">
                            <div class="drop-zone p-3" id="qrDropZone">
                                <input type="file" name="rsa_key_qr" accept="image/*" id="rsaQrInput">
                                <div class="drop-zone-label text-center">
                                    <i class="bi bi-qr-code-scan fs-4 d-block text-muted mb-1"></i>
                                    <span class="text-muted small">Drop QR image or click to browse</span>
                                </div>
                                <!-- Crop animation container -->
                                <div class="qr-scan-container qr-crop-container d-none" id="qrCropContainer">
                                    <img class="qr-original" id="qrOriginal" alt="Original">
                                    <img class="qr-cropped" id="qrCropped" alt="Cropped QR">
                                    <!-- Data panel -->
                                    <div class="qr-data-panel">
                                        <div class="qr-data-filename">
                                            <i class="bi bi-check-circle-fill"></i>
                                            <span>RSA Key loaded</span>
                                        </div>
                                        <div class="qr-data-row">
                                            <span class="qr-status-badge">RSA Key</span>
                                            <span class="qr-data-value">--</span>
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- Key Password (always visible) -->
                        <div class="input-group input-group-sm mt-2">
                            <input type="password" name="rsa_password" class="form-control" id="rsaPasswordInput" placeholder="Key password (if encrypted)">
                            <button class="btn btn-outline-secondary" type="button" data-toggle-password="rsaPasswordInput">
                                <i class="bi bi-eye"></i>
                            </button>
                        </div>
                      </div>
                    </div>

                    <!-- PIN + Channel Row -->
                    <div class="row">
                        <div class="col-md-6 mb-3">
                          <div class="security-box h-100">
                            <label class="form-label"><i class="bi bi-123 me-1"></i> PIN</label>
                            <div class="input-group pin-input-container">
                              <input type="password" name="pin" class="form-control" id="pinInput" placeholder="••••••" maxlength="9">
                              <button class="btn btn-outline-secondary" type="button" data-toggle-password="pinInput">
                                <i class="bi bi-eye"></i>
                              </button>
                            </div>
                            <div class="form-text">Static 6-9 digit PIN</div>
                          </div>
                        </div>

                        <div class="col-md-6 mb-3">
                          <div class="security-box h-100">
                            <label class="form-label">
                                <i class="bi bi-broadcast me-1"></i> Channel
                                <span class="badge bg-info ms-1">v4.0</span>
                                <a href="/about#channel-keys" class="text-muted ms-1" title="Learn about channels"><i class="bi bi-info-circle"></i></a>
                            </label>

                            <select class="form-select" name="channel_key" id="channelSelect">
                                <option value="auto" selected>Auto{% if channel_configured %} (Server Key){% endif %}</option>
                                <option value="none">Public</option>
                                {% if saved_channel_keys %}
                                <optgroup label="Saved Keys">
                                    {% for key in saved_channel_keys %}
                                    <option value="{{ key.channel_key }}" data-key-id="{{ key.id }}">{{ key.name }} ({{ key.channel_key[:4] }}...)</option>
                                    {% endfor %}
                                </optgroup>
                                {% endif %}
                                <option value="custom">Custom...</option>
                            </select>

                            <!-- Server channel indicator (compact) -->
                            <div class="small text-success mt-2 {% if not channel_configured %}d-none{% endif %}" id="channelServerInfo" data-fingerprint="{{ channel_fingerprint[:4] }}-••••-···-••••-{{ channel_fingerprint[-4:] if channel_fingerprint else '' }}">
                                {% if channel_configured %}
                                <i class="bi bi-shield-lock me-1"></i>
                                Server: <code>{{ channel_fingerprint[:4] }}-••••-···-••••-{{ channel_fingerprint[-4:] }}</code>
                                {% endif %}
                            </div>
                          </div>
                        </div>
                    </div>

                    <!-- Custom Channel Key Input (shown when Custom selected) -->
                    <div class="mb-4 d-none" id="channelCustomInput">
                        <div class="security-box">
                            <label class="form-label"><i class="bi bi-key me-1"></i> Custom Channel Key</label>
                            <div class="input-group">
                                <input type="text" name="channel_key_custom" class="form-control font-monospace"
                                       placeholder="XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX"
                                       pattern="[A-Za-z0-9]{4}(-[A-Za-z0-9]{4}){7}"
                                       id="channelKeyInput">
                                <button class="btn btn-outline-secondary" type="button" id="channelKeyGenerate" title="Generate random key">
                                    <i class="bi bi-shuffle"></i>
                                </button>
                            </div>
                            <div class="invalid-feedback" id="channelKeyError">
                                Invalid format. Use: XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX
                            </div>
                        </div>
                    </div>
                    
                    <!-- Advanced Options (DCT sub-options only) -->
                    <div class="mb-4 {% if not has_dct %}d-none{% endif %}" id="advancedOptionsContainer">
                        <a class="btn btn-sm btn-outline-secondary w-100" data-bs-toggle="collapse" href="#advancedOptions" role="button" aria-expanded="false">
                            <i class="bi bi-gear me-1"></i> DCT Options
                            <i class="bi bi-chevron-down ms-1" id="advancedChevron"></i>
                        </a>
                        
                        <div class="collapse" id="advancedOptions">
                            <div class="card card-body mt-2 bg-dark border-secondary py-3">
                                
                                <!-- DCT Color Mode - Compact -->
                                <div class="mb-3">
                                    <label class="form-label small mb-2">
                                        <i class="bi bi-palette me-1"></i> Color
                                    </label>
                                    <div class="d-flex gap-2">
                                        <label class="mode-btn equal-width active" id="dctColorCard" for="dctColorColor">
                                            <input class="form-check-input" type="radio" name="dct_color_mode" id="dctColorColor" value="color" checked>
                                            <i class="bi bi-palette-fill text-success"></i>
                                            <span class="ms-2"><strong>Color</strong> <span class="badge bg-success ms-1">Default</span></span>
                                        </label>
                                        <label class="mode-btn equal-width" id="dctGrayscaleCard" for="dctColorGrayscale">
                                            <input class="form-check-input" type="radio" name="dct_color_mode" id="dctColorGrayscale" value="grayscale">
                                            <i class="bi bi-circle-half text-secondary"></i>
                                            <span class="ms-2"><strong>Grayscale</strong></span>
                                        </label>
                                    </div>
                                </div>
                                
                                <!-- DCT Output Format - Compact -->
                                <div class="mb-0">
                                    <label class="form-label small mb-2">
                                        <i class="bi bi-file-image me-1"></i> Format
                                    </label>
                                    <div class="d-flex gap-2">
                                        <label class="mode-btn equal-width active" id="dctJpegCard" for="dctFormatJpeg">
                                            <input class="form-check-input" type="radio" name="dct_output_format" id="dctFormatJpeg" value="jpeg" checked>
                                            <i class="bi bi-file-earmark-richtext text-warning"></i>
                                            <span class="ms-2"><strong>JPEG</strong> <span class="badge bg-warning text-dark ms-1">Default</span></span>
                                        </label>
                                        <label class="mode-btn equal-width" id="dctPngCard" for="dctFormatPng">
                                            <input class="form-check-input" type="radio" name="dct_output_format" id="dctFormatPng" value="png">
                                            <i class="bi bi-file-earmark-image text-primary"></i>
                                            <span class="ms-2"><strong>PNG</strong> <span class="text-muted d-none d-sm-inline">· Lossless</span></span>
                                        </label>
                                    </div>
                                </div>
                                
                            </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
                    </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 ~24 megapixels (6000x4000). 
                    Files max 30MB upload. 
                    Payload max {{ max_payload_kb }} KB.
                </div>
            </div>
        </div>
    </div>
</div>
{% endblock %}

{% block scripts %}
<script src="{{ url_for('static', filename='js/stegasoo.js') }}"></script>
<script>
// ============================================================================
// ENCODE PAGE - Payload type switching
// ============================================================================

const payloadTextRadio = document.getElementById('payloadText');
const payloadFileRadio = document.getElementById('payloadFile');
const textSection = document.getElementById('textPayloadSection');
const fileSection = document.getElementById('filePayloadSection');
const messageInput = document.getElementById('messageInput');
const payloadFileInput = document.getElementById('payloadFileInput');

function updatePayloadSection() {
    const isText = payloadTextRadio.checked;
    textSection.classList.toggle('d-none', !isText);
    fileSection.classList.toggle('d-none', isText);
    
    if (isText) {
        messageInput.setAttribute('required', '');
        payloadFileInput.removeAttribute('required');
    } else {
        messageInput.removeAttribute('required');
        payloadFileInput.setAttribute('required', '');
    }
}

payloadTextRadio?.addEventListener('change', updatePayloadSection);
payloadFileRadio?.addEventListener('change', updatePayloadSection);

// ============================================================================
// ENCODE PAGE - Passphrase validation
// ============================================================================

const passphraseInput = document.getElementById('passphraseInput');
const passphraseWarning = document.getElementById('passphraseWarning');

passphraseInput?.addEventListener('input', function() {
    const words = this.value.trim().split(/\s+/).filter(w => w.length > 0);
    const recommendedWords = {{ recommended_passphrase_words }};
    
    if (passphraseWarning) {
        passphraseWarning.style.display = (words.length > 0 && words.length < recommendedWords) ? 'block' : 'none';
    }
});

// ============================================================================
// ENCODE PAGE - Payload file info
// ============================================================================

payloadFileInput?.addEventListener('change', function() {
    const fileInfo = document.getElementById('fileInfo');
    const fileInfoName = document.getElementById('fileInfoName');
    const fileInfoSize = document.getElementById('fileInfoSize');
    
    if (this.files && this.files[0]) {
        const file = this.files[0];
        fileInfo?.classList.remove('d-none');
        if (fileInfoName) fileInfoName.textContent = file.name;
        if (fileInfoSize) fileInfoSize.textContent = (file.size / 1024).toFixed(1) + ' KB';
        
        const label = document.getElementById('payloadDropLabel');
        if (label) label.innerHTML = `<i class="bi bi-check-circle text-success me-1"></i>${file.name}`;
    } else {
        fileInfo?.classList.add('d-none');
    }
});

// ============================================================================
// ENCODE PAGE - Character counter
// ============================================================================

messageInput?.addEventListener('input', function() {
    const count = this.value.length;
    const max = 250000;
    const percent = Math.round((count / max) * 100);
    
    const charCount = document.getElementById('charCount');
    const charPercent = document.getElementById('charPercent');
    const charWarning = document.getElementById('charWarning');
    
    if (charCount) charCount.textContent = count.toLocaleString();
    if (charPercent) charPercent.textContent = percent + '%';
    charWarning?.classList.toggle('d-none', percent < 80);
});

// ============================================================================
// ENCODE PAGE - Carrier capacity
// ============================================================================

const capacityPanel = document.getElementById('capacityPanel');
const carrierInput = document.getElementById('carrierInput');

carrierInput?.addEventListener('change', function() {
    if (this.files && this.files[0]) {
        fetchCapacityComparison(this.files[0]);
    }
});

function fetchCapacityComparison(file) {
    const formData = new FormData();
    formData.append('carrier', file);
    
    fetch('/api/compare-capacity', {
        method: 'POST',
        body: formData
    })
    .then(response => response.json())
    .then(data => {
        if (data.error) return;
        
        const dims = document.getElementById('carrierDimensions');
        const lsbBadge = document.getElementById('lsbCapacityBadge');
        const dctBadge = document.getElementById('dctCapacityBadge');
        
        if (dims) dims.textContent = `${data.width} × ${data.height} (${(data.width * data.height / 1000000).toFixed(1)} MP)`;
        if (lsbBadge) lsbBadge.textContent = `LSB: ${data.lsb.capacity_kb} KB`;
        if (dctBadge) dctBadge.textContent = `DCT: ${data.dct.capacity_kb} KB`;
        
        capacityPanel?.classList.remove('d-none');
    })
    .catch(err => console.error('Capacity fetch failed:', err));
}

// ============================================================================
// ENCODE PAGE - Mode switching (LSB/DCT)
// ============================================================================

// Initialize tooltips for mode info icons
document.querySelectorAll('[data-bs-toggle="tooltip"]').forEach(el => {
    new bootstrap.Tooltip(el);
});

// Mode button active state toggle
const modeRadios = document.querySelectorAll('input[name="embed_mode"]');
const modeBtns = { 'dct': document.getElementById('dctModeCard'), 'lsb': document.getElementById('lsbModeCard') };

modeRadios.forEach(radio => {
    radio.addEventListener('change', () => {
        Object.values(modeBtns).forEach(btn => btn?.classList.remove('active'));
        modeBtns[radio.value]?.classList.add('active');
    });
});

// Show/hide DCT options
const modeDct = document.getElementById('modeDct');
const advancedOptionsContainer = document.getElementById('advancedOptionsContainer');

document.querySelectorAll('input[name="embed_mode"]').forEach(radio => {
    radio.addEventListener('change', () => {
        advancedOptionsContainer?.classList.toggle('d-none', !modeDct?.checked);
    });
});

// DCT color mode button active state toggle
const colorModeRadios = document.querySelectorAll('input[name="dct_color_mode"]');
const colorModeBtns = { 'color': document.getElementById('dctColorCard'), 'grayscale': document.getElementById('dctGrayscaleCard') };

colorModeRadios.forEach(radio => {
    radio.addEventListener('change', () => {
        Object.values(colorModeBtns).forEach(btn => btn?.classList.remove('active'));
        colorModeBtns[radio.value]?.classList.add('active');
    });
});

// DCT format button active state toggle
const formatRadios = document.querySelectorAll('input[name="dct_output_format"]');
const formatBtns = { 'png': document.getElementById('dctPngCard'), 'jpeg': document.getElementById('dctJpegCard') };

formatRadios.forEach(radio => {
    radio.addEventListener('change', () => {
        Object.values(formatBtns).forEach(btn => btn?.classList.remove('active'));
        formatBtns[radio.value]?.classList.add('active');
    });
});

// Advanced options chevron
const advancedOptionsEl = document.getElementById('advancedOptions');
advancedOptionsEl?.addEventListener('show.bs.collapse', () => {
    document.getElementById('advancedChevron')?.classList.replace('bi-chevron-down', 'bi-chevron-up');
});
advancedOptionsEl?.addEventListener('hide.bs.collapse', () => {
    document.getElementById('advancedChevron')?.classList.replace('bi-chevron-up', 'bi-chevron-down');
});

// ============================================================================
// ENCODE PAGE - Duplicate file check
// ============================================================================

function checkDuplicateFiles() {
    const refInput = document.querySelector('input[name="reference_photo"]');
    const carInput = document.querySelector('input[name="carrier"]');
    
    if (refInput?.files[0] && carInput?.files[0]) {
        if (refInput.files[0].name === carInput.files[0].name && 
            refInput.files[0].size === carInput.files[0].size) {
            alert("Security Warning: You cannot use the same image for both Reference and Carrier!");
            carInput.value = '';
            document.getElementById('carrierPreview')?.classList.add('d-none');
            const label = document.querySelector('#carrierDropZone .drop-zone-label');
            if (label) {
                label.innerHTML = '<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>';
            }
            capacityPanel?.classList.add('d-none');
        }
    }
}

document.querySelector('input[name="reference_photo"]')?.addEventListener('change', checkDuplicateFiles);
document.querySelector('input[name="carrier"]')?.addEventListener('change', checkDuplicateFiles);
</script>
{% endblock %}