{% 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 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:</label>
                <div class="position-relative">
                  <div class="alert-message p-3 rounded bg-dark border border-secondary" id="decodedContent" style="white-space: pre-wrap;">{{ decoded_message }}</div>
                  <button class="btn btn-sm btn-outline-light position-absolute top-0 end-0 m-2" onclick="navigator.clipboard.writeText(document.getElementById('decodedContent').innerText).then(() => this.innerHTML = '<i class=\'bi bi-check\'></i>').catch(() => alert('Failed to copy'))">
                    <i class="bi bi-clipboard"></i> Copy
                  </button>
                </div>

                <a href="/decode" class="btn btn-outline-light w-100 mt-3">
                    <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">
                                <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" 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">
                            </div>
                            <div class="form-text">
                                The image containing the hidden message/file
                            </div>
                        </div>
                    </div>
                    
                    <div class="mb-3">
                        <label class="form-label" id="dayPhraseLabel">
                            <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>
                    
                    <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="row">
                        <div class="col-md-6 mb-3">

                            <label class="form-label"><i class="bi bi-123 me-1"></i> PIN</label>
                            <div class="input-group">
                                <input type="password" name="pin" class="form-control" id="pinInput" placeholder="6-9 digits" maxlength="9">
                                <button class="btn btn-outline-secondary" type="button" id="togglePin">
                                    <i class="bi bi-eye"></i>
                                </button>
                            </div>
                            <div class="form-text">
                                If PIN was used during encoding
                            </div>
 
                        </div>
                        
                        <div class="col-md-6 mb-3">
                            <label class="form-label">
                                <i class="bi bi-file-earmark-lock me-1"></i> RSA Key
                            </label>
                            <ul class="nav nav-tabs nav-tabs-sm mb-2" role="tablist">
                                <li class="nav-item" role="presentation">
                                    <button class="nav-link active py-1 px-2 small" data-bs-toggle="tab" data-bs-target="#rsaFileTabDec" type="button">
                                        <i class="bi bi-file-earmark me-1"></i>.pem File
                                    </button>
                                </li>
                                <li class="nav-item" role="presentation">
                                    <button class="nav-link py-1 px-2 small" data-bs-toggle="tab" data-bs-target="#rsaQrTabDec" type="button">
                                        <i class="bi bi-qr-code me-1"></i>QR Code
                                    </button>
                                </li>
                            </ul>
                            <div class="tab-content">
                                <div class="tab-pane fade show active" id="rsaFileTabDec" role="tabpanel">
                                    <input type="file" name="rsa_key" class="form-control form-control-sm" id="rsaKeyInput" accept=".pem,.key,application/x-pem-file">
                                </div>
                                <div class="tab-pane fade" id="rsaQrTabDec" role="tabpanel">
                                  <input type="file" name="rsa_key_qr" class="form-control form-control-sm" id="rsaKeyQrInput" accept="image/*">
                                    <div class="form-text small">PNG, JPG, or other image of QR code</div>
                                </div>
                            </div>
                            <div class="form-text">
                                If RSA key was used during encoding (file or QR image)
                            </div>
                        </div>
                    </div>
                    
                    <!-- RSA Key Password (shown when key selected) -->
                    <div class="mb-3 d-none" id="rsaPasswordGroup">
                        <label class="form-label">
                            <i class="bi bi-key me-1"></i> RSA Key Password
                        </label>
                        <input type="password" name="rsa_password" class="form-control"
                               placeholder="Password for the .pem file (if encrypted)">
                        <div class="form-text">
                            Leave blank if your key file is not password-protected
                        </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-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>
                        Provide the <strong>same security factors</strong> (PIN and/or RSA key) used during encoding
                    </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>
                        If using an RSA key, make sure the <strong>password is correct</strong>
                    </li>
                </ul>
            </div>
        </div>
        {% endif %}
    </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;
});

// Show RSA password field when key is selected (only for .pem files, not QR)
const rsaKeyInput = document.getElementById('rsaKeyInput');
const rsaKeyQrInput = document.getElementById('rsaKeyQrInput');
const rsaPasswordGroup = document.getElementById('rsaPasswordGroup');

if (rsaKeyInput) {
    rsaKeyInput.addEventListener('change', function() {
        // Show password field only for .pem files
        rsaPasswordGroup.classList.toggle('d-none', !this.files.length);
        // Clear QR input if file is selected
        if (rsaKeyQrInput && this.files.length) {
            rsaKeyQrInput.value = '';
        }
    });
}

if (rsaKeyQrInput) {
    rsaKeyQrInput.addEventListener('change', function() {
        // Hide password field for QR codes (they're unencrypted)
        rsaPasswordGroup.classList.add('d-none');
        // Clear file input if QR is selected
        if (rsaKeyInput && this.files.length) {
            rsaKeyInput.value = '';
        }
    });
}

// Day names for date detection
const dayNames = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];

// Detect day from filename
function detectDayFromFilename(filename) {
    const dateMatch = filename.match(/_(\d{4})[-]?(\d{2})[-]?(\d{2})/);
    
    if (dateMatch) {
        const [, year, month, day] = dateMatch;
        const date = new Date(year, month - 1, day);
        return dayNames[date.getDay()];
    }
    return null;
}

// Update day phrase label
function updateDayLabel(dayName) {
    const label = document.getElementById('dayPhraseLabel');
    if (label && dayName) {
        label.innerHTML = `<i class="bi bi-chat-quote me-1"></i>Provide <span class="day-of-week-highlight">${dayName}</span>'s Phrase`;
    }
}

// PIN Toggle
document.getElementById('togglePin')?.addEventListener('click', function() {
    const input = document.getElementById('pinInput');
    const icon = this.querySelector('i');
    if (input.type === 'password') {
        input.type = 'text';
        icon.classList.replace('bi-eye', 'bi-eye-slash');
    } else {
        input.type = 'password';
        icon.classList.replace('bi-eye-slash', 'bi-eye');
    }
});

// Paste from Clipboard
document.addEventListener('paste', function(e) {
    if (!document.getElementById('decodeForm')) return;

    const items = e.clipboardData.items;
    for (let i = 0; i < items.length; i++) {
        if (items[i].type.indexOf("image") !== -1) {
            const blob = items[i].getAsFile();
            
            const stegoInput = document.querySelector('input[name="stego_image"]');
            const refInput = document.querySelector('input[name="reference_photo"]');
            
            const targetInput = (!stegoInput.files.length) ? stegoInput : refInput;
            
            const container = new DataTransfer();
            container.items.add(blob);
            targetInput.files = container.files;
            
            targetInput.dispatchEvent(new Event('change'));
            break;
        }
    }
});

// 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');
    const isStegoZone = zone.id === 'stegoDropZone';
    
    ['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');
        });
    });
    
    zone.addEventListener('drop', e => {
        if (e.dataTransfer.files.length) {
            input.files = e.dataTransfer.files;
            const file = e.dataTransfer.files[0];
            showPreview(file);
            
            if (isStegoZone) {
                const dayName = detectDayFromFilename(file.name);
                updateDayLabel(dayName);
            }
        }
    });
    
    input.addEventListener('change', function() {
        if (this.files && this.files[0]) {
            const file = this.files[0];
            showPreview(file);
            
            if (isStegoZone) {
                const dayName = detectDayFromFilename(file.name);
                updateDayLabel(dayName);
            }
        }
    });
    
    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 %}