{% extends "base.html" %}

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

{% block content %}
<style>
/* Accordion styling */
.step-accordion .accordion-button {
    background: rgba(30, 40, 50, 0.6);
    color: #fff;
    padding: 0.75rem 1rem;
    border-left: 3px solid transparent;
    transition: all 0.3s ease;
}
.step-accordion .accordion-button:not(.collapsed) {
    background: linear-gradient(90deg, rgba(99, 179, 237, 0.15) 0%, rgba(40, 50, 60, 0.8) 40%, rgba(40, 50, 60, 0.8) 100%);
    color: #fff;
    box-shadow: inset 0 1px 0 rgba(99, 179, 237, 0.1);
    border-left: 3px solid rgba(99, 179, 237, 0.6);
}
.step-accordion .accordion-button::after {
    filter: invert(1);
}
.step-accordion .accordion-body {
    background: rgba(30, 40, 50, 0.4);
    padding: 1rem;
}
.step-accordion .accordion-item {
    border-color: rgba(255,255,255,0.1);
    background: transparent;
}
.step-accordion .accordion-item:first-child .accordion-button {
    border-radius: 0;
}
.step-accordion .accordion-item:last-child .accordion-button.collapsed {
    border-radius: 0;
}
.step-summary {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.5);
    margin-left: auto;
    padding-right: 1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 50%;
}
.step-summary.has-content {
    color: rgba(99, 179, 237, 0.8);
}
.step-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.step-number {
    background: rgba(246, 173, 85, 0.2);
    color: #f6ad55;
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: bold;
    border: 1px solid rgba(246, 173, 85, 0.3);
}
.step-number.complete {
    background: rgba(72, 187, 120, 0.2);
    color: #48bb78;
    border-color: rgba(72, 187, 120, 0.3);
}

/* 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;
}
.passphrase-input:focus {
    border-color: rgba(99, 179, 237, 0.8) !important;
    box-shadow: 0 0 20px rgba(99, 179, 237, 0.4) !important;
}
.passphrase-input::placeholder {
    color: rgba(99, 179, 237, 0.4);
}

/* 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;
}
.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) !important;
}

/* QR Crop Animation */
.qr-crop-container {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.3);
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 120px;
}
.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);
}
</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 p-0">
                <form method="POST" enctype="multipart/form-data" id="encodeForm">

                    <div class="accordion step-accordion" id="encodeAccordion">

                        <!-- ================================================================
                             STEP 1: IMAGES
                             ================================================================ -->
                        <div class="accordion-item">
                            <h2 class="accordion-header">
                                <button class="accordion-button" type="button" data-bs-toggle="collapse" data-bs-target="#stepImages">
                                    <span class="step-title">
                                        <span class="step-number" id="stepImagesNumber">1</span>
                                        <i class="bi bi-images me-1"></i> Images & Mode
                                    </span>
                                    <span class="step-summary" id="stepImagesSummary">Select reference & carrier</span>
                                </button>
                            </h2>
                            <div id="stepImages" class="accordion-collapse collapse show" data-bs-parent="#encodeAccordion">
                                <div class="accordion-body">

                                    <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 id="refPhotoInput">
                                                <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</span>
                                                </div>
                                                <img class="drop-zone-preview d-none" id="refPreview">
                                                <div class="scan-overlay"><div class="scan-grid"></div><div class="scan-line"></div></div>
                                                <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>
                                                <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>
                                            </div>
                                            <div class="form-text">Secret photo both parties have</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</span>
                                                </div>
                                                <img class="drop-zone-preview d-none" id="carrierPreview">
                                                <div class="pixel-blocks"></div>
                                                <div class="pixel-scan-line"></div>
                                                <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>
                                                <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">-- x -- px</div>
                                                </div>
                                            </div>
                                            <div class="form-text">Image to hide your message in</div>
                                        </div>
                                    </div>

                                    <!-- Capacity Info -->
                                    <div class="alert alert-info small d-none mb-3" id="capacityPanel">
                                        <div class="d-flex justify-content-between align-items-center">
                                            <span><i class="bi bi-rulers me-1"></i><span id="carrierDimensions">-</span></span>
                                            <span>
                                                <span class="badge bg-warning text-dark me-1" id="dctCapacityBadge">DCT: -</span>
                                                <span class="badge bg-primary" id="lsbCapacityBadge">LSB: -</span>
                                            </span>
                                        </div>
                                    </div>

                                    <!-- Embedding Mode -->
                                    <label class="form-label"><i class="bi bi-cpu me-1"></i> Embedding Mode</label>
                                    <div class="d-flex gap-2 mb-2">
                                        <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 d-none d-sm-inline">· Social</span></span>
                                        </label>
                                        <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 d-none d-sm-inline">· Email</span></span>
                                        </label>
                                    </div>

                                    <!-- DCT Options (inline, compact) -->
                                    <div class="{% if not has_dct %}d-none{% endif %}" id="dctOptionsInline">
                                        <div class="row g-2 mt-2" id="dctOptionsRow">
                                            <div class="col-6">
                                                <select class="form-select form-select-sm" name="dct_color_mode" id="dctColorSelect">
                                                    <option value="color" selected>Color</option>
                                                    <option value="grayscale">Grayscale</option>
                                                </select>
                                            </div>
                                            <div class="col-6">
                                                <select class="form-select form-select-sm" name="dct_output_format" id="dctFormatSelect">
                                                    <option value="jpeg" selected>JPEG</option>
                                                    <option value="png">PNG</option>
                                                </select>
                                            </div>
                                        </div>
                                    </div>

                                </div>
                            </div>
                        </div>

                        <!-- ================================================================
                             STEP 2: PAYLOAD
                             ================================================================ -->
                        <div class="accordion-item">
                            <h2 class="accordion-header">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#stepPayload">
                                    <span class="step-title">
                                        <span class="step-number" id="stepPayloadNumber">2</span>
                                        <i class="bi bi-box me-1"></i> Payload
                                    </span>
                                    <span class="step-summary" id="stepPayloadSummary">Message or file to hide</span>
                                </button>
                            </h2>
                            <div id="stepPayload" class="accordion-collapse collapse" data-bs-parent="#encodeAccordion">
                                <div class="accordion-body">

                                    <!-- Payload Type Toggle -->
                                    <div class="btn-group w-100 mb-3" 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>

                                    <!-- Text Message -->
                                    <div id="textPayloadSection">
                                        <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> chars</span>
                                            <span id="charPercent" class="text-muted">0%</span>
                                        </div>
                                    </div>

                                    <!-- File Upload -->
                                    <div class="d-none" id="filePayloadSection">
                                        <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 file or click (max {{ max_payload_kb }} KB)</span>
                                            </div>
                                        </div>
                                        <div id="fileInfo" class="d-none mt-2 p-2 bg-dark rounded small">
                                            <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>

                                </div>
                            </div>
                        </div>

                        <!-- ================================================================
                             STEP 3: SECURITY
                             ================================================================ -->
                        <div class="accordion-item">
                            <h2 class="accordion-header">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#stepSecurity">
                                    <span class="step-title">
                                        <span class="step-number" id="stepSecurityNumber">3</span>
                                        <i class="bi bi-shield-lock me-1"></i> Security
                                    </span>
                                    <span class="step-summary" id="stepSecuritySummary">Passphrase & keys</span>
                                </button>
                            </h2>
                            <div id="stepSecurity" class="accordion-collapse collapse" data-bs-parent="#encodeAccordion">
                                <div class="accordion-body">

                                    <!-- Passphrase -->
                                    <div class="mb-3">
                                        <label class="form-label"><i class="bi bi-chat-quote me-1"></i> Passphrase</label>
                                        <input type="text" name="passphrase" class="form-control passphrase-input"
                                               placeholder="e.g., apple forest thunder mountain" required id="passphraseInput">
                                        <div class="form-text">Your passphrase for this message</div>
                                    </div>

                                    <hr class="my-3 opacity-25">
                                    <div class="small text-muted mb-2">Provide at least one: PIN or RSA Key</div>

                                    <div class="row">
                                        <!-- PIN -->
                                        <div class="col-md-6 mb-2">
                                            <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>
                                        </div>

                                        <!-- Channel -->
                                        <div class="col-md-6 mb-2">
                                            <div class="security-box h-100">
                                                <label class="form-label"><i class="bi bi-broadcast me-1"></i> Channel</label>
                                                <select class="form-select form-select-sm" name="channel_key" id="channelSelect">
                                                    <option value="auto" selected>Auto{% if channel_configured %} (Server){% 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 }}">{{ key.name }}</option>
                                                        {% endfor %}
                                                    </optgroup>
                                                    {% endif %}
                                                    <option value="custom">Custom...</option>
                                                </select>
                                            </div>
                                        </div>
                                    </div>

                                    <!-- Custom Channel Key -->
                                    <div class="mb-3 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 form-control-sm font-monospace"
                                                       placeholder="XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX" id="channelKeyInput">
                                                <button class="btn btn-outline-secondary btn-sm" type="button" id="channelKeyScan" title="Scan QR"><i class="bi bi-camera"></i></button>
                                                <button class="btn btn-outline-secondary btn-sm" type="button" id="channelKeyGenerate" title="Generate"><i class="bi bi-shuffle"></i></button>
                                            </div>
                                        </div>
                                    </div>

                                    <!-- RSA Key -->
                                    <div class="mb-3">
                                        <div class="security-box">
                                            <label class="form-label"><i class="bi bi-file-earmark-lock me-1"></i> RSA Key <span class="text-muted">(optional)</span></label>
                                            <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</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</label>
                                            </div>
                                            <div id="rsaFileSection">
                                                <input type="file" name="rsa_key" class="form-control form-control-sm" accept=".pem">
                                            </div>
                                            <div id="rsaQrSection" class="d-none d-flex flex-column">
                                                <input type="hidden" name="rsa_key_pem" id="rsaKeyPem">
                                                <div class="drop-zone p-2 w-100" 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-5 d-block text-muted mb-1"></i>
                                                        <span class="text-muted small">Drop QR image</span>
                                                    </div>
                                                    <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">
                                                    </div>
                                                </div>
                                                <button type="button" class="btn btn-outline-secondary btn-sm w-100 mt-2" id="rsaQrWebcam">
                                                    <i class="bi bi-camera me-1"></i>Scan with Camera
                                                </button>
                                            </div>
                                            <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>

                                </div>
                            </div>
                        </div>

                    </div>

                    <!-- Submit Button -->
                    <div class="p-3">
                        <button type="submit" class="btn btn-primary btn-lg w-100" id="encodeBtn">
                            <i class="bi bi-lock me-2"></i>Encode
                        </button>
                    </div>

                </form>
            </div>
        </div>

        <!-- Footer info -->
        <div class="row text-center text-muted small mt-3">
            <div class="col-4">
                <i class="bi bi-shield-check fs-5 d-block mb-1 text-success"></i>
                AES-256-GCM
            </div>
            <div class="col-4">
                <i class="bi bi-shuffle fs-5 d-block mb-1 text-info"></i>
                Random Pixels
            </div>
            <div class="col-4">
                <i class="bi bi-eye-slash fs-5 d-block mb-1 text-warning"></i>
                Undetectable
            </div>
        </div>
    </div>
</div>
{% endblock %}

{% block scripts %}
<script src="{{ url_for('static', filename='js/stegasoo.js') }}"></script>
<script>
// ============================================================================
// ACCORDION SUMMARY UPDATES
// ============================================================================

function updateImagesSummary() {
    const ref = document.getElementById('refPhotoInput')?.files[0];
    const carrier = document.getElementById('carrierInput')?.files[0];
    const mode = document.querySelector('input[name="embed_mode"]:checked')?.value?.toUpperCase() || 'LSB';
    const summary = document.getElementById('stepImagesSummary');
    const stepNum = document.getElementById('stepImagesNumber');

    if (ref && carrier) {
        const refName = ref.name.length > 12 ? ref.name.slice(0, 10) + '..' : ref.name;
        const carName = carrier.name.length > 12 ? carrier.name.slice(0, 10) + '..' : carrier.name;
        summary.textContent = `${refName} + ${carName}, ${mode}`;
        summary.classList.add('has-content');
        stepNum.classList.add('complete');
        stepNum.innerHTML = '<i class="bi bi-check"></i>';
    } else if (ref || carrier) {
        summary.textContent = ref ? ref.name.slice(0, 15) : carrier.name.slice(0, 15);
        summary.classList.remove('has-content');
        stepNum.classList.remove('complete');
        stepNum.textContent = '1';
    } else {
        summary.textContent = 'Select reference & carrier';
        summary.classList.remove('has-content');
        stepNum.classList.remove('complete');
        stepNum.textContent = '1';
    }
}

function updatePayloadSummary() {
    const isText = document.getElementById('payloadText')?.checked;
    const message = document.getElementById('messageInput')?.value || '';
    const file = document.getElementById('payloadFileInput')?.files[0];
    const summary = document.getElementById('stepPayloadSummary');
    const stepNum = document.getElementById('stepPayloadNumber');

    if (isText && message.trim()) {
        const preview = message.trim().slice(0, 25) + (message.length > 25 ? '...' : '');
        summary.textContent = `"${preview}"`;
        summary.classList.add('has-content');
        stepNum.classList.add('complete');
        stepNum.innerHTML = '<i class="bi bi-check"></i>';
    } else if (!isText && file) {
        summary.textContent = file.name.slice(0, 20);
        summary.classList.add('has-content');
        stepNum.classList.add('complete');
        stepNum.innerHTML = '<i class="bi bi-check"></i>';
    } else {
        summary.textContent = 'Message or file to hide';
        summary.classList.remove('has-content');
        stepNum.classList.remove('complete');
        stepNum.textContent = '2';
    }
}

function updateSecuritySummary() {
    const passphrase = document.getElementById('passphraseInput')?.value || '';
    const pin = document.getElementById('pinInput')?.value || '';
    const rsaFile = document.querySelector('input[name="rsa_key"]')?.files[0];
    const rsaPem = document.getElementById('rsaKeyPem')?.value || '';
    const summary = document.getElementById('stepSecuritySummary');
    const stepNum = document.getElementById('stepSecurityNumber');

    const parts = [];
    if (passphrase.trim()) parts.push('passphrase');
    if (pin) parts.push('PIN');
    if (rsaFile || rsaPem) parts.push('RSA');

    if (parts.length > 0) {
        summary.textContent = parts.join(' + ');
        summary.classList.add('has-content');
        if (passphrase.trim() && (pin || rsaFile || rsaPem)) {
            stepNum.classList.add('complete');
            stepNum.innerHTML = '<i class="bi bi-check"></i>';
        }
    } else {
        summary.textContent = 'Passphrase & keys';
        summary.classList.remove('has-content');
        stepNum.classList.remove('complete');
        stepNum.textContent = '3';
    }
}

// Attach listeners
document.getElementById('refPhotoInput')?.addEventListener('change', updateImagesSummary);
document.getElementById('carrierInput')?.addEventListener('change', updateImagesSummary);
document.querySelectorAll('input[name="embed_mode"]').forEach(r => r.addEventListener('change', updateImagesSummary));

document.getElementById('messageInput')?.addEventListener('input', updatePayloadSummary);
document.getElementById('payloadFileInput')?.addEventListener('change', updatePayloadSummary);
document.querySelectorAll('input[name="payload_type"]').forEach(r => r.addEventListener('change', updatePayloadSummary));

document.getElementById('passphraseInput')?.addEventListener('input', updateSecuritySummary);
document.getElementById('pinInput')?.addEventListener('input', updateSecuritySummary);
document.querySelector('input[name="rsa_key"]')?.addEventListener('change', updateSecuritySummary);

// ============================================================================
// 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', '');
    }
    updatePayloadSummary();
}

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

// ============================================================================
// FILE INFO DISPLAY
// ============================================================================

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');
    }
});

// ============================================================================
// CHARACTER COUNTER
// ============================================================================

messageInput?.addEventListener('input', function() {
    const count = this.value.length;
    document.getElementById('charCount').textContent = count.toLocaleString();
    document.getElementById('charPercent').textContent = Math.round((count / 250000) * 100) + '%';
});

// ============================================================================
// CAPACITY FETCH
// ============================================================================

const carrierInput = document.getElementById('carrierInput');
carrierInput?.addEventListener('change', function() {
    if (this.files && this.files[0]) {
        const formData = new FormData();
        formData.append('carrier', this.files[0]);
        fetch('/api/compare-capacity', { method: 'POST', body: formData })
            .then(r => r.json())
            .then(data => {
                if (data.error) return;
                document.getElementById('carrierDimensions').textContent = `${data.width} x ${data.height}`;
                document.getElementById('lsbCapacityBadge').textContent = `LSB: ${data.lsb.capacity_kb} KB`;
                document.getElementById('dctCapacityBadge').textContent = `DCT: ${data.dct.capacity_kb} KB`;
                document.getElementById('capacityPanel')?.classList.remove('d-none');
            }).catch(() => {});
    }
});

// ============================================================================
// MODE SWITCHING
// ============================================================================

const modeRadios = document.querySelectorAll('input[name="embed_mode"]');
const modeBtns = { 'dct': document.getElementById('dctModeCard'), 'lsb': document.getElementById('lsbModeCard') };
const dctOptionsRow = document.getElementById('dctOptionsRow');

modeRadios.forEach(radio => {
    radio.addEventListener('change', () => {
        Object.values(modeBtns).forEach(btn => btn?.classList.remove('active'));
        modeBtns[radio.value]?.classList.add('active');
        dctOptionsRow?.classList.toggle('d-none', radio.value !== 'dct');
    });
});

// Show DCT options if DCT selected initially
if (document.getElementById('modeDct')?.checked) {
    dctOptionsRow?.classList.remove('d-none');
}

// ============================================================================
// 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("You cannot use the same image for both Reference and Carrier!");
            carInput.value = '';
            document.getElementById('carrierPreview')?.classList.add('d-none');
            updateImagesSummary();
        }
    }
}

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