{% extends "base.html" %}

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

{% block content %}
<style>
/* Glowing passphrase input */
.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-unlock-fill me-2"></i>Decode Secret Message or File</h5>
            </div>
            <div class="card-body">
                {% if decoded_message %}
                <!-- Text Message Result -->
                <div class="alert alert-success">
                    <h6><i class="bi bi-check-circle me-2"></i>Message Decrypted Successfully!</h6>
                </div>
               
                <label class="form-label text-muted">Decoded Message: <small class="text-secondary">(click to copy)</small></label>
                <div class="alert-message p-3 rounded bg-dark border border-secondary mb-3" id="decodedContent" style="white-space: pre-wrap; cursor: pointer; transition: border-color 0.2s;"
                     onclick="navigator.clipboard.writeText(this.innerText).then(() => { this.style.borderColor = '#198754'; this.dataset.origText = this.innerHTML; this.innerHTML = '<i class=\'bi bi-check-circle text-success\'></i> Copied to clipboard!'; setTimeout(() => { this.innerHTML = this.dataset.origText; this.style.borderColor = ''; }, 1500); }).catch(() => alert('Failed to copy'))"
                     onmouseover="this.style.borderColor = '#6c757d'"
                     onmouseout="this.style.borderColor = ''">{{ decoded_message }}</div>

                <a href="/decode" class="btn btn-outline-light w-100">
                    <i class="bi bi-arrow-repeat me-2"></i>Decode Another
                </a>
                
                {% elif decoded_file %}
                <!-- File Result -->
                <div class="alert alert-success">
                    <h6><i class="bi bi-check-circle me-2"></i>File Decrypted Successfully!</h6>
                </div>
                
                <div class="text-center mb-4">
                    <i class="bi bi-file-earmark-check text-success" style="font-size: 4rem;"></i>
                    <h5 class="mt-3">{{ filename }}</h5>
                    <p class="text-muted mb-1">{{ file_size }}</p>
                    {% if mime_type %}
                    <small class="text-muted">Type: {{ mime_type }}</small>
                    {% endif %}
                </div>
                
                <a href="{{ url_for('decode_download', file_id=file_id) }}" class="btn btn-primary btn-lg w-100 mb-3">
                    <i class="bi bi-download me-2"></i>Download File
                </a>
                
                <div class="alert alert-warning small">
                    <i class="bi bi-clock me-1"></i>
                    <strong>File expires in 5 minutes.</strong> Download now.
                </div>
                
                <a href="/decode" class="btn btn-outline-light w-100">
                    <i class="bi bi-arrow-repeat me-2"></i>Decode Another
                </a>
                
                {% else %}
                <!-- Decode Form -->
                <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 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 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 pixel-container" id="stegoDropZone">
                                <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" id="stegoPreview">
                                <!-- 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="stegoFileName">image.png</span>
                                    </div>
                                    <div class="pixel-data-row">
                                        <span class="pixel-status-badge">Stego Loaded</span>
                                        <span class="pixel-data-value" id="stegoFileSize">--</span>
                                    </div>
                                    <div class="pixel-dimensions" id="stegoDims">-- × -- px</div>
                                </div>
                            </div>
                            <div class="form-text">
                                The image containing the hidden message/file
                            </div>
                        </div>
                    </div>
                    
                    <div class="mb-3">
                        <label class="form-label">
                            <i class="bi bi-chat-quote me-1"></i> Passphrase
                        </label>
                        <input type="text" name="passphrase" id="passphraseInput" class="form-control passphrase-input" 
                               placeholder="e.g., correct horse battery staple" required>
                        <div class="form-text">
                            The passphrase used during encoding (typically 4 words)
                        </div>
                    </div>
                    
                    <hr class="my-4">
                    
                    <h6 class="text-muted mb-3">
                        SECURITY FACTORS 
                        <span class="text-warning small">(provide same factors used during encoding)</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" id="rsaKeyInput" accept=".pem,.key,application/x-pem-file">
                        </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="rsaKeyQrInput">
                                <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">If PIN was used during encoding</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">v4.1</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="channelSelectDec">
                                <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="channelServerInfoDec" data-fingerprint="{{ (channel_fingerprint[:4] if channel_fingerprint else '') }}-••••-···-••••-{{ channel_fingerprint[-4:] if channel_fingerprint else '' }}">
                                {% if channel_configured and channel_fingerprint %}
                                <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="channelCustomInputDec">
                        <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="channelKeyInputDec">
                            </div>
                        </div>
                    </div>
                    
                    <!-- ================================================================
                         ADVANCED OPTIONS (v3.0) - Extraction Mode
                         ================================================================ -->
                    <div class="mb-4">
                        <a class="btn btn-sm btn-outline-secondary w-100" data-bs-toggle="collapse" href="#advancedOptionsDec" role="button" aria-expanded="false">
                            <i class="bi bi-gear me-1"></i> Advanced Options
                            <i class="bi bi-chevron-down ms-1" id="advancedChevronDec"></i>
                        </a>
                        
                        <div class="collapse" id="advancedOptionsDec">
                            <div class="card card-body mt-2 bg-dark border-secondary">
                                
                                <!-- Extraction Mode Selection -->
                                <div class="mb-0">
                                    <label class="form-label">
                                        <i class="bi bi-cpu me-1"></i> Extraction Mode
                                        <span class="badge bg-info ms-1">v3.0</span>
                                    </label>
                                    
                                    <div class="d-flex gap-2">
                                        <!-- Auto Mode -->
                                        <label class="mode-btn flex-fill active" id="autoModeCard" for="modeAuto">
                                            <input class="form-check-input" type="radio" name="embed_mode" id="modeAuto" value="auto" checked>
                                            <i class="bi bi-magic text-success"></i>
                                            <span class="ms-2"><strong>Auto</strong> <span class="text-muted d-none d-sm-inline">· Try both</span></span>
                                        </label>
                                        
                                        <!-- LSB Mode -->
                                        <label class="mode-btn flex-fill" id="lsbModeCardDec" for="modeLsbDec">
                                            <input class="form-check-input" type="radio" name="embed_mode" id="modeLsbDec" value="lsb">
                                            <i class="bi bi-grid-3x3-gap text-primary"></i>
                                            <span class="ms-2"><strong>LSB</strong> <span class="text-muted d-none d-sm-inline">· Spatial</span></span>
                                        </label>
                                        
                                        <!-- DCT Mode -->
                                        <label class="mode-btn flex-fill {% if not has_dct %}opacity-50{% endif %}" id="dctModeCardDec" for="modeDctDec">
                                            <input class="form-check-input" type="radio" name="embed_mode" id="modeDctDec" value="dct" {% if not has_dct %}disabled{% endif %}>
                                            <i class="bi bi-soundwave text-warning"></i>
                                            <span class="ms-2"><strong>DCT</strong> <span class="text-muted d-none d-sm-inline">· Frequency</span></span>
                                        </label>
                                    </div>
                                    
                                    <div class="form-text mt-2">
                                        <i class="bi bi-lightbulb me-1"></i>
                                        <strong>Auto</strong> tries LSB first, then DCT.
                                        {% if not has_dct %}
                                        <span class="text-warning ms-2"><i class="bi bi-exclamation-triangle me-1"></i>DCT requires scipy</span>
                                        {% endif %}
                                    </div>
                                </div>
                                
                            </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
                    </button>
                </form>
                
                {% endif %}
            </div>
        </div>
        
        {% if not decoded_message and not decoded_file %}
        <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-check-circle-fill text-success me-1"></i>
                        Use the <strong>exact same reference photo</strong> file (byte-for-byte identical)
                    </li>
                    <li class="mb-2">
                        <i class="bi bi-check-circle-fill text-success me-1"></i>
                        Enter the <strong>exact passphrase</strong> used during encoding (case-sensitive, spacing matters)
                    </li>
                    <li class="mb-2">
                        <i class="bi bi-check-circle-fill text-success me-1"></i>
                        Provide the <strong>same security factors</strong> (PIN and/or RSA key) used during encoding
                    </li>
                    <li class="mb-2">
                        <i class="bi bi-exclamation-triangle-fill text-warning me-1"></i>
                        Ensure the stego image hasn't been <strong>resized, cropped, or recompressed</strong>
                    </li>
                    <li class="mb-2">
                        <i class="bi bi-exclamation-triangle-fill text-warning me-1"></i>
                        <strong>Format compatibility:</strong> v4.0 cannot decode messages from v3.1 or earlier (different format)
                    </li>
                    <li class="mb-2">
                        <i class="bi bi-broadcast text-info me-1"></i>
                        <strong>Channel key:</strong> Use the same channel (Auto/Public/Custom) that was used during encoding
                    </li>
                    <li class="mb-2">
                        <i class="bi bi-info-circle-fill text-info me-1"></i>
                        If using an RSA key, verify the <strong>password is correct</strong> (if key is encrypted)
                    </li>
                    <li class="mb-0">
                        <i class="bi bi-info-circle-fill text-info me-1"></i>
                        If auto-detection fails, try specifying <strong>LSB or DCT mode</strong> in Advanced Options
                    </li>
                </ul>
            </div>
        </div>
        {% endif %}
    </div>
</div>
{% endblock %}

{% block scripts %}
<script src="{{ url_for('static', filename='js/stegasoo.js') }}"></script>
<script>
// Extraction mode button active state toggle
const extractModeRadios = document.querySelectorAll('input[name="embed_mode"]');
const extractModeBtns = { 
    'auto': document.getElementById('autoModeCard'), 
    'lsb': document.getElementById('lsbModeCardDec'), 
    'dct': document.getElementById('dctModeCardDec') 
};

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

// Advanced options chevron
const advancedOptionsDec = document.getElementById('advancedOptionsDec');
advancedOptionsDec?.addEventListener('show.bs.collapse', () => {
    document.getElementById('advancedChevronDec')?.classList.replace('bi-chevron-down', 'bi-chevron-up');
});
advancedOptionsDec?.addEventListener('hide.bs.collapse', () => {
    document.getElementById('advancedChevronDec')?.classList.replace('bi-chevron-up', 'bi-chevron-down');
});
</script>
{% endblock %}
