{% extends "base.html" %}

{% block title %}Resize PDF - DocuPDF{% endblock %}

{% block styles %}
<style>
    /* === MOBILE-FIRST RESPONSIVE LAYOUT === */
    
    /* Prevent body scroll when modal is open */
    body.modal-open {
        overflow: hidden;
    }
    
    /* Main container - fills viewport properly */
    .resize-container {
        height: calc(100vh - 56px); /* Subtract navbar height */
        height: calc(100dvh - 56px); /* Dynamic viewport height for mobile */
        display: flex;
        flex-direction: column;
        overflow: hidden;
    }
    
    /* Card takes full height */
    .resize-card {
        flex: 1;
        display: flex;
        flex-direction: column;
        overflow: hidden;
        margin: 0.5rem;
        border-radius: 0.5rem;
    }
    
    .resize-card .card-header {
        flex-shrink: 0;
        padding: 0.75rem 1rem;
    }
    
    .resize-card .card-header h2 {
        font-size: 1.25rem;
        margin: 0;
    }
    
    .resize-card .card-body {
        flex: 1;
        display: flex;
        flex-direction: column;
        overflow: hidden;
        padding: 0;
    }
    
    /* === PANEL LAYOUT === */
    .panels-container {
        flex: 1;
        display: flex;
        flex-direction: column;
        overflow: hidden;
    }
    
    @media (min-width: 992px) {
        .panels-container {
            flex-direction: row;
        }
    }
    
    .panel {
        flex: 1;
        display: flex;
        flex-direction: column;
        overflow: hidden;
        min-height: 0; /* Critical for flex children to scroll */
    }
    
    .panel-header {
        flex-shrink: 0;
        padding: 0.75rem 1rem;
        background: rgba(0, 0, 0, 0.2);
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .panel-header h5 {
        margin: 0;
        font-size: 1rem;
        font-weight: 600;
    }
    
    /* === SCROLLABLE CONTENT - TOUCH OPTIMIZED === */
    .panel-content {
        flex: 1;
        overflow-y: auto;
        overflow-x: hidden;
        min-height: 0;
        
        /* Enable smooth touch scrolling */
        -webkit-overflow-scrolling: touch;
        overscroll-behavior: contain;
        
        /* Hide scrollbar but keep functionality */
        scrollbar-width: thin;
        scrollbar-color: rgba(255,255,255,0.3) transparent;
    }
    
    .panel-content::-webkit-scrollbar {
        width: 4px;
    }
    
    .panel-content::-webkit-scrollbar-track {
        background: transparent;
    }
    
    .panel-content::-webkit-scrollbar-thumb {
        background: rgba(255, 255, 255, 0.3);
        border-radius: 4px;
    }
    
    /* === FILE BROWSER PANEL === */
    .file-browser-panel {
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    @media (min-width: 992px) {
        .file-browser-panel {
            border-bottom: none;
            border-right: 1px solid rgba(255, 255, 255, 0.1);
        }
    }
    
    /* Search bar */
    .search-bar {
        padding: 0.75rem 1rem;
        background: rgba(0, 0, 0, 0.1);
    }
    
    .search-bar .input-group {
        max-width: 100%;
    }
    
    .search-bar .form-control {
        font-size: 16px; /* Prevents zoom on iOS */
    }
    
    /* Breadcrumb */
    .breadcrumb-wrapper {
        padding: 0.5rem 1rem;
        background: rgba(0, 0, 0, 0.15);
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        white-space: nowrap;
    }
    
    .breadcrumb {
        margin: 0;
        flex-wrap: nowrap;
        font-size: 0.875rem;
    }
    
    /* File list */
    .file-list {
        padding: 0;
    }
    
    .file-item {
        display: flex;
        align-items: center;
        padding: 0.875rem 1rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        cursor: pointer;
        transition: background-color 0.15s ease;
        
        /* Larger touch target */
        min-height: 48px;
        
        /* Prevent text selection on touch */
        -webkit-user-select: none;
        user-select: none;
        
        /* Touch feedback */
        -webkit-tap-highlight-color: rgba(13, 110, 253, 0.3);
    }
    
    .file-item:active {
        background-color: rgba(13, 110, 253, 0.2);
    }
    
    .file-item.selected {
        background-color: #0d6efd !important;
    }
    
    .file-item .icon {
        font-size: 1.25rem;
        margin-right: 0.75rem;
        flex-shrink: 0;
    }
    
    .file-item .filename {
        flex: 1;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        font-size: 0.9375rem;
    }
    
    .file-item .badge {
        margin-left: 0.5rem;
        flex-shrink: 0;
    }
    
    .file-item.folder .icon {
        color: #ffc107;
    }
    
    .file-item.pdf .icon {
        color: #dc3545;
    }
    
    /* Empty state */
    .empty-state {
        padding: 2rem;
        text-align: center;
        color: rgba(255, 255, 255, 0.5);
    }
    
    /* === OPTIONS PANEL === */
    .options-panel .panel-content {
        padding: 1rem;
    }
    
    /* Form groups with better spacing */
    .option-group {
        margin-bottom: 1.25rem;
        padding-bottom: 1.25rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .option-group:last-child {
        border-bottom: none;
        margin-bottom: 0;
        padding-bottom: 0;
    }
    
    .option-group label,
    .option-group .option-label {
        display: block;
        font-weight: 600;
        margin-bottom: 0.5rem;
        font-size: 0.875rem;
        color: rgba(255, 255, 255, 0.9);
    }
    
    /* Radio/Checkbox - larger touch targets */
    .option-choice {
        display: flex;
        align-items: center;
        padding: 0.625rem 0.75rem;
        margin: 0.25rem 0;
        border-radius: 0.375rem;
        cursor: pointer;
        transition: background-color 0.15s;
        
        /* Touch target */
        min-height: 44px;
        -webkit-tap-highlight-color: rgba(13, 110, 253, 0.2);
    }
    
    .option-choice:active {
        background-color: rgba(255, 255, 255, 0.1);
    }
    
    .option-choice input {
        width: 20px;
        height: 20px;
        margin-right: 0.75rem;
        flex-shrink: 0;
    }
    
    .option-choice span {
        font-size: 0.9375rem;
    }
    
    /* Sub-options (stitch direction) */
    .sub-options {
        margin-left: 1.5rem;
        padding-left: 1rem;
        border-left: 2px solid rgba(255, 255, 255, 0.2);
    }
    
    /* Color palette */
    .color-palette {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
        align-items: center;
    }
    
    .color-swatch {
        width: 44px;
        height: 44px;
        border-radius: 0.5rem;
        border: 3px solid transparent;
        cursor: pointer;
        transition: all 0.15s;
        -webkit-tap-highlight-color: transparent;
    }
    
    .color-swatch:active {
        transform: scale(0.95);
    }
    
    .color-swatch.active {
        border-color: #fff;
        box-shadow: 0 0 0 2px rgba(13, 110, 253, 0.5);
    }
    
    .color-custom-btn {
        height: 44px;
        padding: 0 1rem;
        font-size: 0.875rem;
    }
    
    /* Pattern choices - horizontal on mobile */
    .pattern-choices {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .pattern-choice {
        flex: 1;
        min-width: 80px;
        text-align: center;
        padding: 0.75rem;
        border: 2px solid rgba(255, 255, 255, 0.2);
        border-radius: 0.5rem;
        cursor: pointer;
        transition: all 0.15s;
        -webkit-tap-highlight-color: transparent;
    }
    
    .pattern-choice:active {
        background-color: rgba(255, 255, 255, 0.1);
    }
    
    .pattern-choice.active {
        border-color: #0d6efd;
        background-color: rgba(13, 110, 253, 0.2);
    }
    
    .pattern-choice input {
        display: none;
    }
    
    .pattern-choice .pattern-icon {
        font-size: 1.5rem;
        margin-bottom: 0.25rem;
    }
    
    .pattern-choice .pattern-name {
        font-size: 0.75rem;
        text-transform: uppercase;
        letter-spacing: 0.5px;
    }
    
    /* === SUBMIT BUTTON === */
    .submit-section {
        flex-shrink: 0;
        padding: 1rem;
        background: rgba(0, 0, 0, 0.2);
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .submit-btn {
        width: 100%;
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
        font-weight: 600;
        border-radius: 0.5rem;
        
        /* Touch optimization */
        min-height: 50px;
    }
    
    /* Selected file indicator */
    .selected-file-indicator {
        display: flex;
        align-items: center;
        padding: 0.5rem 0.75rem;
        margin-bottom: 0.75rem;
        background: rgba(13, 110, 253, 0.2);
        border-radius: 0.375rem;
        font-size: 0.875rem;
    }
    
    .selected-file-indicator .bi {
        margin-right: 0.5rem;
        color: #0d6efd;
    }
    
    .selected-file-indicator .filename {
        flex: 1;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
    
    .selected-file-indicator .clear-btn {
        padding: 0.25rem 0.5rem;
        font-size: 0.75rem;
    }
    
    /* === COLOR PICKER MODAL === */
    .color-picker-modal .modal-content {
        border-radius: 1rem;
    }
    
    .color-picker-wrapper {
        padding: 1rem;
    }
    
    .saturation-brightness-area {
        width: 100%;
        aspect-ratio: 1;
        max-width: 280px;
        margin: 0 auto;
        border-radius: 0.5rem;
        position: relative;
        cursor: crosshair;
        touch-action: none; /* Prevent scrolling while dragging */
    }
    
    .saturation-brightness-area .gradient-white {
        position: absolute;
        inset: 0;
        background: linear-gradient(to right, #fff, transparent);
        border-radius: inherit;
    }
    
    .saturation-brightness-area .gradient-black {
        position: absolute;
        inset: 0;
        background: linear-gradient(to bottom, transparent, #000);
        border-radius: inherit;
    }
    
    .sb-cursor {
        position: absolute;
        width: 20px;
        height: 20px;
        border: 3px solid #fff;
        border-radius: 50%;
        box-shadow: 0 0 0 1px #000, inset 0 0 0 1px #000;
        transform: translate(-50%, -50%);
        pointer-events: none;
    }
    
    .hue-slider-area {
        width: 100%;
        max-width: 280px;
        height: 32px;
        margin: 1rem auto 0;
        border-radius: 1rem;
        background: linear-gradient(to right, 
            #f00 0%, #ff0 17%, #0f0 33%, 
            #0ff 50%, #00f 67%, #f0f 83%, #f00 100%);
        position: relative;
        cursor: pointer;
        touch-action: none;
    }
    
    .hue-cursor {
        position: absolute;
        top: 50%;
        width: 8px;
        height: 120%;
        background: #fff;
        border: 2px solid #000;
        border-radius: 4px;
        transform: translate(-50%, -50%);
        pointer-events: none;
    }
    
    .color-preview-row {
        display: flex;
        align-items: center;
        gap: 1rem;
        margin-top: 1rem;
        max-width: 280px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .color-preview-box {
        width: 60px;
        height: 60px;
        border-radius: 0.5rem;
        border: 2px solid rgba(255, 255, 255, 0.3);
        flex-shrink: 0;
    }
    
    .color-hex-input {
        flex: 1;
        font-size: 16px; /* Prevent zoom on iOS */
        text-transform: uppercase;
        font-family: monospace;
    }
    
    /* === TABLET SPECIFIC ADJUSTMENTS === */
    @media (min-width: 768px) and (max-width: 1199px) {
        .panels-container {
            flex-direction: row;
        }
        
        .file-browser-panel {
            flex: 0 0 45%;
            border-bottom: none;
            border-right: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        .options-panel {
            flex: 0 0 55%;
        }
    }
    
    @media (max-width: 767px) {
        /* Stack panels on small screens */
        .file-browser-panel {
            flex: 0 0 50%;
            min-height: 40vh;
        }
        
        .options-panel {
            flex: 1;
            min-height: 0;
        }
    }
    
    /* Landscape tablet */
    @media (min-height: 600px) and (orientation: landscape) {
        .resize-container {
            height: calc(100vh - 56px);
            height: calc(100dvh - 56px);
        }
        
        .panels-container {
            flex-direction: row;
        }
        
        .file-browser-panel,
        .options-panel {
            flex: 1;
        }
    }
    
    /* Very short screens */
    @media (max-height: 500px) {
        .resize-card .card-header {
            padding: 0.5rem 1rem;
        }
        
        .resize-card .card-header h2 {
            font-size: 1rem;
        }
        
        .option-group {
            margin-bottom: 0.75rem;
            padding-bottom: 0.75rem;
        }
    }
</style>
{% endblock %}

{% block content %}
<div class="resize-container">
    <div class="card bg-dark text-white resize-card">
        <div class="card-header">
            <h2><i class="bi bi-arrows-angle-expand me-2"></i>Resize PDF for Notes</h2>
        </div>
        
        <div class="card-body">
            <form action="{{ url_for('main.resize_pdf_route', folder_path=breadcrumbs|map(attribute='path')|join('/')) }}" 
                  method="post" 
                  id="resize-form"
                  class="h-100 d-flex flex-column">
                
                <div class="panels-container">
                    <!-- FILE BROWSER PANEL -->
                    <div class="panel file-browser-panel">
                        <div class="panel-header">
                            <h5><i class="bi bi-folder2-open me-2"></i>Select PDF File</h5>
                        </div>
                        
                        <!-- Search -->
                        <div class="search-bar">
                            <div class="input-group">
                                <input type="text" 
                                       class="form-control" 
                                       name="search" 
                                       placeholder="Search PDFs..." 
                                       value="{{ search_query or '' }}"
                                       autocomplete="off">
                                <button class="btn btn-primary" type="submit">
                                    <i class="bi bi-search"></i>
                                </button>
                                {% if search_query %}
                                <a href="{{ url_for('main.resize_pdf_route') }}" class="btn btn-outline-secondary">
                                    <i class="bi bi-x-lg"></i>
                                </a>
                                {% endif %}
                            </div>
                        </div>
                        
                        <!-- Breadcrumb -->
                        <div class="breadcrumb-wrapper">
                            <nav aria-label="breadcrumb">
                                <ol class="breadcrumb mb-0">
                                    <li class="breadcrumb-item">
                                        <a href="{{ url_for('main.resize_pdf_route') }}">
                                            <i class="bi bi-house-fill"></i>
                                        </a>
                                    </li>
                                    {% for item in breadcrumbs %}
                                    <li class="breadcrumb-item">
                                        <a href="{{ url_for('main.resize_pdf_route', folder_path=item.path) }}">{{ item.name }}</a>
                                    </li>
                                    {% endfor %}
                                </ol>
                            </nav>
                        </div>
                        
                        <!-- File List -->
                        <div class="panel-content file-list" id="file-list">
                            {% if not subfolders and not pdfs %}
                            <div class="empty-state">
                                <i class="bi bi-folder-x" style="font-size: 3rem;"></i>
                                <p class="mt-2 mb-0">No files found</p>
                            </div>
                            {% else %}
                                {% for folder in subfolders %}
                                <div class="file-item folder" data-path="{{ (breadcrumbs|map(attribute='path')|list)|last if breadcrumbs else '' }}/{{ folder.name }}">
                                    <i class="bi bi-folder-fill icon"></i>
                                    <span class="filename">{{ folder.name }}</span>
                                    <i class="bi bi-chevron-right text-muted"></i>
                                </div>
                                {% endfor %}
                                
                                {% for pdf in pdfs %}
                                <div class="file-item pdf" data-filename="{{ pdf.filename }}">
                                    <i class="bi bi-file-earmark-pdf-fill icon"></i>
                                    <span class="filename">{{ pdf.filename }}</span>
                                    {% if pdf.persist %}
                                    <span class="badge bg-info"><i class="bi bi-pin-fill"></i></span>
                                    {% endif %}
                                </div>
                                {% endfor %}
                            {% endif %}
                        </div>
                        
                        <input type="hidden" name="input_pdf" id="input_pdf">
                    </div>
                    
                    <!-- OPTIONS PANEL -->
                    <div class="panel options-panel">
                        <div class="panel-header">
                            <h5><i class="bi bi-gear me-2"></i>Options</h5>
                        </div>
                        
                        <div class="panel-content">
                            <!-- Selected File Indicator -->
                            <div class="selected-file-indicator" id="selected-indicator" style="display: none;">
                                <i class="bi bi-file-earmark-pdf-fill"></i>
                                <span class="filename" id="selected-filename"></span>
                                <button type="button" class="btn btn-outline-danger btn-sm clear-btn" id="clear-selection">
                                    <i class="bi bi-x"></i>
                                </button>
                            </div>
                            
                            <!-- Output Filename -->
                            <div class="option-group">
                                <label for="output_pdf">Output Filename</label>
                                <input type="text" 
                                       class="form-control" 
                                       id="output_pdf" 
                                       name="output_pdf" 
                                       placeholder="Select a PDF first..."
                                       required>
                            </div>
                            
                            <!-- Processing Mode -->
                            <div class="option-group">
                                <span class="option-label">Processing Mode</span>
                                
                                <label class="option-choice">
                                    <input type="radio" name="mode" value="notes_only" checked>
                                    <span>Add notes area to full page</span>
                                </label>
                                
                                <label class="option-choice">
                                    <input type="radio" name="mode" value="split">
                                    <span>Split page into two pages</span>
                                </label>
                                
                                <label class="option-choice">
                                    <input type="radio" name="mode" value="stitch">
                                    <span>Stitch split columns on one page</span>
                                </label>
                                
                                <!-- Stitch Sub-options -->
                                <div class="sub-options" id="stitch-options" style="display: none;">
                                    <span class="option-label">Stitch Direction</span>
                                    <label class="option-choice">
                                        <input type="radio" name="stitch_direction" value="horizontal" checked>
                                        <span>Horizontal</span>
                                    </label>
                                    <label class="option-choice">
                                        <input type="radio" name="stitch_direction" value="vertical">
                                        <span>Vertical</span>
                                    </label>
                                </div>
                            </div>
                            
                            <!-- Add Space Option -->
                            <div class="option-group">
                                <label class="option-choice">
                                    <input type="checkbox" id="add_space" name="add_space" checked>
                                    <span>Add space for notes</span>
                                </label>
                            </div>
                            
                            <!-- Background Color -->
                            <div class="option-group">
                                <span class="option-label">Background Color</span>
                                <div class="color-palette">
                                    <div class="color-swatch" data-color="#FDF5E6" style="background-color: #FDF5E6;" title="Cream"></div>
                                    <div class="color-swatch" data-color="#FFFFFF" style="background-color: #FFFFFF;" title="White"></div>
                                    <div class="color-swatch" data-color="#F5F5F5" style="background-color: #F5F5F5;" title="Light Gray"></div>
                                    <div class="color-swatch" data-color="#E6F7FF" style="background-color: #E6F7FF;" title="Light Blue"></div>
                                    <div class="color-swatch" data-color="#FFF9E6" style="background-color: #FFF9E6;" title="Light Yellow"></div>
                                    <button type="button" class="btn btn-outline-light color-custom-btn" data-bs-toggle="modal" data-bs-target="#colorPickerModal">
                                        <i class="bi bi-palette me-1"></i>Custom
                                    </button>
                                </div>
                                <input type="hidden" name="bg_color" id="bg_color" value="#FDF5E6">
                            </div>
                            
                            <!-- Background Pattern -->
                            <div class="option-group">
                                <span class="option-label">Background Pattern</span>
                                <div class="pattern-choices">
                                    <label class="pattern-choice active">
                                        <input type="radio" name="pattern" value="" checked>
                                        <div class="pattern-icon">▢</div>
                                        <div class="pattern-name">None</div>
                                    </label>
                                    <label class="pattern-choice">
                                        <input type="radio" name="pattern" value="grid">
                                        <div class="pattern-icon">▦</div>
                                        <div class="pattern-name">Grid</div>
                                    </label>
                                    <label class="pattern-choice">
                                        <input type="radio" name="pattern" value="dots">
                                        <div class="pattern-icon">⠿</div>
                                        <div class="pattern-name">Dots</div>
                                    </label>
                                </div>
                            </div>
                        </div>
                        
                        <!-- Submit Button -->
                        <div class="submit-section">
                            <button type="submit" class="btn btn-primary submit-btn" id="submit-btn" disabled>
                                <i class="bi bi-check-lg me-2"></i>Resize PDF
                            </button>
                        </div>
                    </div>
                </div>
            </form>
        </div>
    </div>
</div>

<!-- Color Picker Modal -->
<div class="modal fade color-picker-modal" id="colorPickerModal" tabindex="-1">
    <div class="modal-dialog modal-dialog-centered">
        <div class="modal-content bg-dark text-white">
            <div class="modal-header border-secondary">
                <h5 class="modal-title">
                    <i class="bi bi-palette me-2"></i>Choose Color
                </h5>
                <button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal"></button>
            </div>
            <div class="modal-body">
                <div class="color-picker-wrapper" id="color-picker-ui">
                    <!-- Saturation/Brightness Area -->
                    <div class="saturation-brightness-area" id="sb-area">
                        <div class="gradient-white"></div>
                        <div class="gradient-black"></div>
                        <div class="sb-cursor" id="sb-cursor"></div>
                    </div>
                    
                    <!-- Hue Slider -->
                    <div class="hue-slider-area" id="hue-slider">
                        <div class="hue-cursor" id="hue-cursor"></div>
                    </div>
                    
                    <!-- Preview & Hex Input -->
                    <div class="color-preview-row">
                        <div class="color-preview-box" id="color-preview"></div>
                        <input type="text" class="form-control color-hex-input" id="color-hex-input" value="#FF0000" maxlength="7">
                    </div>
                </div>
            </div>
            <div class="modal-footer border-secondary">
                <button type="button" class="btn btn-outline-secondary" data-bs-dismiss="modal">Cancel</button>
                <button type="button" class="btn btn-primary" id="save-color-btn">
                    <i class="bi bi-check-lg me-1"></i>Apply Color
                </button>
            </div>
        </div>
    </div>
</div>
{% endblock %}

{% block scripts %}
<script>
document.addEventListener('DOMContentLoaded', () => {
    // === ELEMENTS ===
    const fileList = document.getElementById('file-list');
    const inputPdf = document.getElementById('input_pdf');
    const outputPdf = document.getElementById('output_pdf');
    const submitBtn = document.getElementById('submit-btn');
    const selectedIndicator = document.getElementById('selected-indicator');
    const selectedFilename = document.getElementById('selected-filename');
    const clearSelection = document.getElementById('clear-selection');
    const stitchOptions = document.getElementById('stitch-options');
    const addSpaceCheckbox = document.getElementById('add_space');
    const bgColorInput = document.getElementById('bg_color');
    
    let selectedRow = null;
    
    // === FILE SELECTION ===
    function selectFile(filename, element) {
        // Remove previous selection
        if (selectedRow) {
            selectedRow.classList.remove('selected');
        }
        
        // Set new selection
        selectedRow = element;
        selectedRow.classList.add('selected');
        inputPdf.value = filename;
        
        // Show indicator
        selectedFilename.textContent = filename;
        selectedIndicator.style.display = 'flex';
        
        // Enable submit
        submitBtn.disabled = false;
        
        // Update output filename
        updateOutputFilename();
    }
    
    function clearFileSelection() {
        if (selectedRow) {
            selectedRow.classList.remove('selected');
            selectedRow = null;
        }
        inputPdf.value = '';
        outputPdf.value = '';
        selectedIndicator.style.display = 'none';
        submitBtn.disabled = true;
    }
    
    // File list click handler
    fileList.addEventListener('click', (e) => {
        const fileItem = e.target.closest('.file-item');
        if (!fileItem) return;
        
        if (fileItem.classList.contains('folder')) {
            // Navigate to folder
            const path = fileItem.dataset.path;
            window.location.href = `/resize/browse/${path}`;
        } else if (fileItem.classList.contains('pdf')) {
            // Select PDF
            selectFile(fileItem.dataset.filename, fileItem);
        }
    });
    
    // Clear selection button
    clearSelection.addEventListener('click', clearFileSelection);
    
    // === OUTPUT FILENAME GENERATION ===
    function updateOutputFilename() {
        if (!inputPdf.value) return;
        
        const baseName = inputPdf.value.replace(/\.pdf$/i, '');
        const mode = document.querySelector('input[name="mode"]:checked').value;
        const addSpace = addSpaceCheckbox.checked;
        
        let suffix = '_' + mode;
        
        if (mode === 'stitch') {
            const direction = document.querySelector('input[name="stitch_direction"]:checked').value;
            suffix += `_${direction.substring(0, 4)}`;
        }
        
        if (addSpace) {
            suffix += '_notes';
        }
        
        outputPdf.value = `${baseName}${suffix}.pdf`;
    }
    
    // === MODE SWITCHING ===
    document.querySelectorAll('input[name="mode"]').forEach(radio => {
        radio.addEventListener('change', () => {
            const isStitch = radio.value === 'stitch' && radio.checked;
            stitchOptions.style.display = isStitch ? 'block' : 'none';
            updateOutputFilename();
        });
    });
    
    document.querySelectorAll('input[name="stitch_direction"]').forEach(radio => {
        radio.addEventListener('change', updateOutputFilename);
    });
    
    addSpaceCheckbox.addEventListener('change', updateOutputFilename);
    
    // === PATTERN SELECTION ===
    document.querySelectorAll('.pattern-choice').forEach(choice => {
        choice.addEventListener('click', () => {
            document.querySelectorAll('.pattern-choice').forEach(c => c.classList.remove('active'));
            choice.classList.add('active');
        });
    });
    
    // === COLOR PALETTE ===
    const colorSwatches = document.querySelectorAll('.color-swatch');
    
    function setActiveColor(color) {
        bgColorInput.value = color;
        localStorage.setItem('resizeBgColor', color);
        
        colorSwatches.forEach(swatch => {
            swatch.classList.toggle('active', swatch.dataset.color.toUpperCase() === color.toUpperCase());
        });
    }
    
    colorSwatches.forEach(swatch => {
        swatch.addEventListener('click', () => {
            setActiveColor(swatch.dataset.color);
        });
    });
    
    // Load saved color
    const savedColor = localStorage.getItem('resizeBgColor') || '#FDF5E6';
    setActiveColor(savedColor);
    
    // === COLOR PICKER ===
    const sbArea = document.getElementById('sb-area');
    const sbCursor = document.getElementById('sb-cursor');
    const hueSlider = document.getElementById('hue-slider');
    const hueCursor = document.getElementById('hue-cursor');
    const colorPreview = document.getElementById('color-preview');
    const colorHexInput = document.getElementById('color-hex-input');
    const saveColorBtn = document.getElementById('save-color-btn');
    
    let hsv = { h: 0, s: 1, v: 1 };
    
    function hsvToRgb(h, s, v) {
        let r, g, b;
        const i = Math.floor(h / 60);
        const f = h / 60 - i;
        const p = v * (1 - s);
        const q = v * (1 - f * s);
        const t = v * (1 - (1 - f) * s);
        
        switch (i % 6) {
            case 0: r = v; g = t; b = p; break;
            case 1: r = q; g = v; b = p; break;
            case 2: r = p; g = v; b = t; break;
            case 3: r = p; g = q; b = v; break;
            case 4: r = t; g = p; b = v; break;
            case 5: r = v; g = p; b = q; break;
        }
        
        return {
            r: Math.round(r * 255),
            g: Math.round(g * 255),
            b: Math.round(b * 255)
        };
    }
    
    function rgbToHex(r, g, b) {
        return '#' + [r, g, b].map(x => x.toString(16).padStart(2, '0')).join('').toUpperCase();
    }
    
    function hexToHsv(hex) {
        const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
        if (!result) return { h: 0, s: 1, v: 1 };
        
        let r = parseInt(result[1], 16) / 255;
        let g = parseInt(result[2], 16) / 255;
        let b = parseInt(result[3], 16) / 255;
        
        const max = Math.max(r, g, b);
        const min = Math.min(r, g, b);
        const d = max - min;
        
        let h = 0;
        const s = max === 0 ? 0 : d / max;
        const v = max;
        
        if (max !== min) {
            switch (max) {
                case r: h = (g - b) / d + (g < b ? 6 : 0); break;
                case g: h = (b - r) / d + 2; break;
                case b: h = (r - g) / d + 4; break;
            }
            h /= 6;
        }
        
        return { h: h * 360, s, v };
    }
    
    function updateColorPicker() {
        const rgb = hsvToRgb(hsv.h, hsv.s, hsv.v);
        const hex = rgbToHex(rgb.r, rgb.g, rgb.b);
        
        // Update SB area background
        sbArea.style.backgroundColor = `hsl(${hsv.h}, 100%, 50%)`;
        
        // Update cursors
        sbCursor.style.left = `${hsv.s * 100}%`;
        sbCursor.style.top = `${(1 - hsv.v) * 100}%`;
        hueCursor.style.left = `${(hsv.h / 360) * 100}%`;
        
        // Update preview and input
        colorPreview.style.backgroundColor = hex;
        colorHexInput.value = hex;
    }
    
    // Pointer handlers for touch support
    function handleSBInteraction(e) {
        const rect = sbArea.getBoundingClientRect();
        const clientX = e.touches ? e.touches[0].clientX : e.clientX;
        const clientY = e.touches ? e.touches[0].clientY : e.clientY;
        
        hsv.s = Math.max(0, Math.min(1, (clientX - rect.left) / rect.width));
        hsv.v = Math.max(0, Math.min(1, 1 - (clientY - rect.top) / rect.height));
        
        updateColorPicker();
    }
    
    function handleHueInteraction(e) {
        const rect = hueSlider.getBoundingClientRect();
        const clientX = e.touches ? e.touches[0].clientX : e.clientX;
        
        hsv.h = Math.max(0, Math.min(360, ((clientX - rect.left) / rect.width) * 360));
        
        updateColorPicker();
    }
    
    // SB Area events
    let sbDragging = false;
    
    sbArea.addEventListener('mousedown', (e) => {
        sbDragging = true;
        handleSBInteraction(e);
    });
    
    sbArea.addEventListener('touchstart', (e) => {
        sbDragging = true;
        handleSBInteraction(e);
        e.preventDefault();
    }, { passive: false });
    
    document.addEventListener('mousemove', (e) => {
        if (sbDragging) handleSBInteraction(e);
    });
    
    document.addEventListener('touchmove', (e) => {
        if (sbDragging) {
            handleSBInteraction(e);
            e.preventDefault();
        }
    }, { passive: false });
    
    document.addEventListener('mouseup', () => sbDragging = false);
    document.addEventListener('touchend', () => sbDragging = false);
    
    // Hue Slider events
    let hueDragging = false;
    
    hueSlider.addEventListener('mousedown', (e) => {
        hueDragging = true;
        handleHueInteraction(e);
    });
    
    hueSlider.addEventListener('touchstart', (e) => {
        hueDragging = true;
        handleHueInteraction(e);
        e.preventDefault();
    }, { passive: false });
    
    document.addEventListener('mousemove', (e) => {
        if (hueDragging) handleHueInteraction(e);
    });
    
    document.addEventListener('touchmove', (e) => {
        if (hueDragging) {
            handleHueInteraction(e);
            e.preventDefault();
        }
    }, { passive: false });
    
    document.addEventListener('mouseup', () => hueDragging = false);
    document.addEventListener('touchend', () => hueDragging = false);
    
    // Hex input
    colorHexInput.addEventListener('change', () => {
        const value = colorHexInput.value.trim();
        if (/^#[0-9A-Fa-f]{6}$/.test(value)) {
            hsv = hexToHsv(value);
            updateColorPicker();
        }
    });
    
    // Save color button
    saveColorBtn.addEventListener('click', () => {
        setActiveColor(colorHexInput.value);
        bootstrap.Modal.getInstance(document.getElementById('colorPickerModal')).hide();
    });
    
    // Initialize color picker when modal opens
    document.getElementById('colorPickerModal').addEventListener('show.bs.modal', () => {
        hsv = hexToHsv(bgColorInput.value || '#FDF5E6');
        updateColorPicker();
    });
    
    // Initialize
    updateColorPicker();
});
</script>
{% endblock %}