{% extends "base.html" %}

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

{% block content %}
<style>
/* Accordion styling */
.step-accordion .accordion-button {
    background: rgba(35, 45, 55, 0.8);
    color: #fff;
    padding: 0.75rem 1rem;
    border-left: 3px solid rgba(255, 230, 153, 0.3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transition: all 0.3s ease;
}
.step-accordion .accordion-button:hover {
    background: rgba(45, 55, 65, 0.9);
    border-left-color: rgba(255, 230, 153, 0.5);
}
.step-accordion .accordion-button:not(.collapsed) {
    background: linear-gradient(90deg, rgba(255, 230, 153, 0.12) 0%, rgba(40, 50, 60, 0.85) 40%, rgba(40, 50, 60, 0.85) 100%);
    color: #fff;
    box-shadow: inset 0 1px 0 rgba(255, 230, 153, 0.1);
    border-left: 3px solid #ffe699;
}
.step-accordion .accordion-button::after {
    filter: brightness(0) invert(1);
    opacity: 0.5;
}
.step-accordion .accordion-button:not(.collapsed)::after {
    opacity: 0.9;
}
.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 - uses .qr-scan-container from style.css */
</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: CARRIER & MODE
                             ================================================================ -->
                        <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> Carrier & 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">

                                    <input type="hidden" name="carrier_type" id="carrierTypeInput" value="image">

                                    <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-earmark me-1"></i> Carrier File
                                            </label>
                                            <div id="imageCarrierSection">
                                                <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" id="imageCarrierHint">Image to hide your message in</div>
                                            </div>

                                            <!-- Audio Carrier (hidden by default, shown when audio type selected) -->
                                            <div class="d-none" id="audioCarrierSection">
                                                <div class="drop-zone pixel-container" id="audioCarrierDropZone">
                                                    <input type="file" name="audio_carrier" accept="audio/*" id="audioCarrierInput">
                                                    <div class="drop-zone-label">
                                                        <i class="bi bi-music-note-beamed fs-3 d-block mb-2 text-muted"></i>
                                                        <span class="text-muted">Drop audio or click</span>
                                                    </div>
                                                    <div class="pixel-data-panel">
                                                        <div class="pixel-data-filename"><i class="bi bi-check-circle-fill"></i><span id="audioCarrierFileName">audio.wav</span></div>
                                                        <div class="pixel-data-row"><span class="pixel-status-badge">Audio Loaded</span><span class="pixel-data-value" id="audioCarrierFileSize">--</span></div>
                                                        <div class="pixel-dimensions" id="audioCarrierDuration">--:-- duration</div>
                                                    </div>
                                                </div>
                                                <div class="form-text" id="audioCarrierHint">Audio file to hide your message in</div>
                                            </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>

                                    <!-- Audio Capacity Info (v4.3.0) -->
                                    <div class="alert alert-info small d-none mb-3" id="audioCapacityPanel">
                                        <div class="d-flex justify-content-between align-items-center">
                                            <span><i class="bi bi-music-note-beamed me-1"></i><span id="audioInfo">-</span></span>
                                            <span>
                                                <span class="badge bg-primary me-1" id="lsbAudioCapacityBadge">LSB: -</span>
                                                <span class="badge bg-warning text-dark" id="spreadCapacityBadge">Spread: -</span>
                                            </span>
                                        </div>
                                    </div>

                                    <!-- Mode & Carrier Type toggles (aligned row) -->
                                    <div class="row">
                                        <div class="col-md-6">
                                            <div id="imageModeGroup">
                                                <div class="d-flex gap-2 align-items-center flex-wrap mb-2">
                                                    <div class="btn-group btn-group-sm" role="group">
                                                        <input type="radio" class="btn-check" name="embed_mode" id="modeDct" value="dct" {% if has_dct %}checked{% endif %} {% if not has_dct %}disabled{% endif %}>
                                                        <label class="btn btn-outline-secondary btn-sm text-nowrap" for="modeDct" id="dctModeLabel"><i class="bi bi-soundwave me-1"></i>DCT</label>
                                                        <input type="radio" class="btn-check" name="embed_mode" id="modeLsb" value="lsb" {% if not has_dct %}checked{% endif %}>
                                                        <label class="btn btn-outline-secondary btn-sm text-nowrap" for="modeLsb"><i class="bi bi-grid-3x3-gap me-1"></i>LSB</label>
                                                    </div>
                                                    <span class="text-muted d-none d-sm-inline">|</span>
                                                    <span class="d-flex gap-2 align-items-center" id="outputOptions">
                                                        <div class="btn-group btn-group-sm" role="group">
                                                            <input type="radio" class="btn-check" name="dct_color_mode" id="colorMode" value="color" checked>
                                                            <label class="btn btn-outline-secondary btn-sm" for="colorMode">Color</label>
                                                            <input type="radio" class="btn-check" name="dct_color_mode" id="grayMode" value="grayscale">
                                                            <label class="btn btn-outline-secondary btn-sm" for="grayMode" id="grayModeLabel">Gray</label>
                                                        </div>
                                                        <div class="btn-group btn-group-sm" role="group">
                                                            <input type="radio" class="btn-check" name="dct_output_format" id="jpegFormat" value="jpeg" checked>
                                                            <label class="btn btn-outline-secondary btn-sm" for="jpegFormat" id="jpegFormatLabel">JPEG</label>
                                                            <input type="radio" class="btn-check" name="dct_output_format" id="pngFormat" value="png">
                                                            <label class="btn btn-outline-secondary btn-sm" for="pngFormat">PNG</label>
                                                        </div>
                                                    </span>
                                                </div>
                                            </div>
                                            <!-- Audio Modes (hidden by default) -->
                                            <div class="d-none" id="audioModeGroup">
                                                <div class="btn-group btn-group-sm mb-2" role="group">
                                                    <input type="radio" class="btn-check" name="embed_mode" id="modeAudioLsb" value="audio_lsb">
                                                    <label class="btn btn-outline-secondary btn-sm text-nowrap" for="modeAudioLsb"><i class="bi bi-grid-3x3-gap me-1"></i>LSB</label>
                                                    <input type="radio" class="btn-check" name="embed_mode" id="modeAudioSpread" value="audio_spread">
                                                    <label class="btn btn-outline-secondary btn-sm text-nowrap" for="modeAudioSpread"><i class="bi bi-broadcast me-1"></i>Spread</label>
                                                </div>
                                            </div>
                                            <div class="form-text" id="modeHint">
                                                <i class="bi bi-{% if has_dct %}phone{% else %}hdd{% endif %} me-1"></i>{% if has_dct %}Survives social media compression{% else %}Higher capacity for direct transfers{% endif %}
                                            </div>
                                        </div>
                                        <div class="col-md-6">
                                            <div class="d-flex align-items-center gap-2">
                                                <div class="btn-group btn-group-sm" role="group">
                                                    <input type="radio" class="btn-check" name="carrier_type_select" id="typeImage" value="image" checked>
                                                    <label class="btn btn-outline-secondary btn-sm text-nowrap" for="typeImage"><i class="bi bi-image me-1"></i>Image</label>
                                                    <input type="radio" class="btn-check" name="carrier_type_select" id="typeAudio" value="audio" {% if not has_audio %}disabled{% endif %}>
                                                    <label class="btn btn-outline-secondary btn-sm text-nowrap {% if not has_audio %}disabled text-muted{% endif %}" for="typeAudio"><i class="bi bi-music-note-beamed me-1"></i>Audio</label>
                                                </div>
                                                {% if not has_audio %}
                                                <span class="form-text text-warning mb-0" style="font-size: 0.7rem;"><i class="bi bi-exclamation-triangle me-1"></i>Requires numpy + soundfile</span>
                                                {% endif %}
                                            </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 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>
                Covertly Embedded
            </div>
        </div>
    </div>
</div>
{% endblock %}

{% block scripts %}
<script src="{{ url_for('static', filename='js/soosef.js') }}"></script>
<script>
// ============================================================================
// MODE HINT - Dynamic text based on selected embedding mode
// ============================================================================
const modeHints = {
    dct: { icon: 'phone', text: 'Survives social media compression' },
    lsb: { icon: 'hdd', text: 'Higher capacity, outputs Color PNG' },
    audio_lsb: { icon: 'soundwave', text: 'Highest capacity, lossless carriers only (WAV/FLAC)' },
    audio_spread: { icon: 'broadcast', text: 'Lower capacity, survives lossy conversion (MP3/AAC)' }
};

document.querySelectorAll('input[name="embed_mode"]').forEach(radio => {
    radio.addEventListener('change', function() {
        const hint = document.getElementById('modeHint');
        const data = modeHints[this.value];
        if (hint && data) {
            hint.innerHTML = `<i class="bi bi-${data.icon} me-1"></i>${data.text}`;
        }
    });
});

// ============================================================================
// CARRIER TYPE TOGGLE (v4.3.0)
// ============================================================================

const carrierTypeRadios = document.querySelectorAll('input[name="carrier_type_select"]');
const carrierTypeInput = document.getElementById('carrierTypeInput');
const imageCarrierSection = document.getElementById('imageCarrierSection');
const audioCarrierSection = document.getElementById('audioCarrierSection');
const imageModeGroup = document.getElementById('imageModeGroup');
const audioModeGroup = document.getElementById('audioModeGroup');
const capacityPanel = document.getElementById('capacityPanel');
const audioCapacityPanel = document.getElementById('audioCapacityPanel');

carrierTypeRadios.forEach(radio => {
    radio.addEventListener('change', function() {
        const isAudio = this.value === 'audio';
        carrierTypeInput.value = this.value;

        // Toggle carrier sections
        if (imageCarrierSection) imageCarrierSection.classList.toggle('d-none', isAudio);
        if (audioCarrierSection) audioCarrierSection.classList.toggle('d-none', !isAudio);

        // Toggle required attribute so hidden inputs don't block form submission
        const imgCarrier = document.getElementById('carrierInput');
        const audCarrier = document.getElementById('audioCarrierInput');
        if (imgCarrier) { if (isAudio) imgCarrier.removeAttribute('required'); else imgCarrier.setAttribute('required', ''); }
        if (audCarrier) { if (isAudio) audCarrier.setAttribute('required', ''); else audCarrier.removeAttribute('required'); }

        // Toggle mode groups
        if (imageModeGroup) imageModeGroup.classList.toggle('d-none', isAudio);
        if (audioModeGroup) audioModeGroup.classList.toggle('d-none', !isAudio);

        // Toggle capacity panels
        if (capacityPanel) capacityPanel.classList.add('d-none');
        if (audioCapacityPanel) audioCapacityPanel.classList.add('d-none');

        // Select default mode for the active type and update hint
        if (isAudio) {
            const audioLsb = document.getElementById('modeAudioLsb');
            if (audioLsb) { audioLsb.checked = true; audioLsb.dispatchEvent(new Event('change')); }
        } else {
            // Reset to DCT if available, else LSB
            const dctRadio = document.getElementById('modeDct');
            const lsbRadio = document.getElementById('modeLsb');
            if (dctRadio && !dctRadio.disabled) {
                dctRadio.checked = true; dctRadio.dispatchEvent(new Event('change'));
            } else if (lsbRadio) {
                lsbRadio.checked = true; lsbRadio.dispatchEvent(new Event('change'));
            }
        }

        // Clear carrier file selections
        const carrierInput = document.getElementById('carrierInput');
        const audioCarrierInput = document.getElementById('audioCarrierInput');
        if (carrierInput) carrierInput.value = '';
        if (audioCarrierInput) audioCarrierInput.value = '';

        // Reset previews
        document.getElementById('carrierPreview')?.classList.add('d-none');

        // Update step title
        const stepImagesTitle = document.querySelector('#stepImages')?.closest('.accordion-item')?.querySelector('.accordion-button .step-title');
        if (stepImagesTitle) {
            const icon = stepImagesTitle.querySelector('i:not(.step-number i)');
            const textNode = stepImagesTitle.childNodes[stepImagesTitle.childNodes.length - 1];
            if (icon) {
                icon.className = isAudio ? 'bi bi-music-note-beamed me-1' : 'bi bi-images me-1';
            }
        }

        updateImagesSummary();
    });
});

// Audio carrier file change handler
const audioCarrierInput = document.getElementById('audioCarrierInput');
audioCarrierInput?.addEventListener('change', function() {
    if (this.files && this.files[0]) {
        const file = this.files[0];
        document.getElementById('audioCarrierFileName').textContent = file.name;
        document.getElementById('audioCarrierFileSize').textContent = (file.size / 1024).toFixed(1) + ' KB';

        // Fetch audio capacity
        const formData = new FormData();
        formData.append('carrier', file);
        fetch('/api/audio-capacity', { method: 'POST', body: formData })
            .then(r => r.json())
            .then(data => {
                if (data.error) return;
                const info = `${data.format || 'Audio'} · ${data.sample_rate}Hz · ${data.channels}ch · ${data.duration}s`;
                document.getElementById('audioInfo').textContent = info;
                document.getElementById('lsbAudioCapacityBadge').textContent = `LSB: ${(data.lsb_capacity / 1024).toFixed(1)} KB`;
                document.getElementById('spreadCapacityBadge').textContent = `Spread: ${(data.spread_capacity / 1024).toFixed(1)} KB`;
                document.getElementById('audioCapacityPanel')?.classList.remove('d-none');
                if (data.duration) {
                    document.getElementById('audioCarrierDuration').textContent = data.duration + 's duration';
                }
            }).catch(() => {});

        // Trigger the drop zone animation
        const dropZone = document.getElementById('audioCarrierDropZone');
        if (dropZone) {
            dropZone.classList.add('has-file');
        }

        updateImagesSummary();
    }
});

// ============================================================================
// ACCORDION SUMMARY UPDATES
// ============================================================================

function updateImagesSummary() {
    const ref = document.getElementById('refPhotoInput')?.files[0];
    const isAudio = carrierTypeInput?.value === 'audio';
    const carrier = isAudio
        ? document.getElementById('audioCarrierInput')?.files[0]
        : 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 = isAudio ? 'Select reference & audio' : '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.getElementById('audioCarrierInput')?.addEventListener('change', updateImagesSummary);
document.querySelectorAll('input[name="embed_mode"]').forEach(r => r.addEventListener('change', updateImagesSummary));
document.querySelectorAll('#audioModeGroup 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 dctModeLabel = document.getElementById('dctModeLabel');
const grayModeInput = document.getElementById('grayMode');
const grayModeLabel = document.getElementById('grayModeLabel');
const jpegFormatInput = document.getElementById('jpegFormat');
const jpegFormatLabel = document.getElementById('jpegFormatLabel');
const colorModeInput = document.getElementById('colorMode');
const pngFormatInput = document.getElementById('pngFormat');

// Apply disabled styling to DCT if not available
if (document.getElementById('modeDct')?.disabled) {
    dctModeLabel?.classList.add('disabled', 'text-muted');
}

function updateOutputOptions(mode) {
    const isLsb = mode === 'lsb';
    if (isLsb) {
        // LSB only supports Color + PNG
        colorModeInput.checked = true;
        pngFormatInput.checked = true;
        grayModeInput.disabled = true;
        jpegFormatInput.disabled = true;
        grayModeLabel?.classList.add('disabled', 'text-muted');
        jpegFormatLabel?.classList.add('disabled', 'text-muted');
    } else {
        // DCT: reset to defaults (Color + JPEG) and enable all
        colorModeInput.checked = true;
        jpegFormatInput.checked = true;
        grayModeInput.disabled = false;
        jpegFormatInput.disabled = false;
        grayModeLabel?.classList.remove('disabled', 'text-muted');
        jpegFormatLabel?.classList.remove('disabled', 'text-muted');
    }
}

modeRadios.forEach(radio => {
    radio.addEventListener('change', () => updateOutputOptions(radio.value));
});

// Initialize output options based on initial mode
const initialMode = document.querySelector('input[name="embed_mode"]:checked')?.value || 'lsb';
updateOutputOptions(initialMode);

// ============================================================================
// 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 %}