{% extends "base.html" %}

{% block title %}Edit QR Code - QR Code Management{% endblock %}

{% block content %}
<div class="form-page">
    <div class="form-card">
        <div class="form-header">
            <h1>
                <i class="fas fa-edit"></i>
                Edit QR Code
            </h1>
            <p>Modify the information for "{{ qr_code.name }}"</p>
        </div>

        <!-- Current QR Code Display -->
        <div class="current-qr-section">
            <div class="current-qr-header">
                <h3>
                    <i class="fas fa-qrcode"></i>
                    Current QR Code
                </h3>
                <p>This is the current version of your QR code</p>
            </div>
            
            <div class="current-qr-display">
                <div class="current-qr-image">
                    <img src="data:image/png;base64,{{ qr_code.qr_code_image }}" 
                         alt="{{ qr_code.name }} QR Code"
                         onclick="showCurrentQRModal()">
                    <div class="image-overlay">
                        <i class="fas fa-search-plus"></i>
                        <span>Click to enlarge</span>
                    </div>
                </div>
                
                <div class="current-qr-info">
                    <div class="qr-meta">
                        <div class="meta-item">
                            <i class="fas fa-calendar-plus"></i>
                            <span>Created: {{ qr_code.created_date.strftime('%B %d, %Y') }}</span>
                        </div>
                        <div class="meta-item">
                            <i class="fas fa-user"></i>
                            <span>By: {{ qr_code.creator.full_name }}</span>
                        </div>
                        <div class="meta-item">
                            <i class="fas fa-hashtag"></i>
                            <span>ID: #{{ qr_code.id }}</span>
                        </div>
                    </div>
                    
                    <div class="current-details">
                        <div class="detail-row">
                            <strong>Location:</strong>
                            <span>{{ qr_code.location }}</span>
                        </div>
                        <div class="detail-row">
                            <strong>Event:</strong>
                            <span>{{ qr_code.location_event }}</span>
                        </div>
                        <div class="detail-row">
                            <strong>Address:</strong>
                            <span class="address-text">{{ qr_code.location_address }}</span>
                        </div>
                    </div>
                </div>
            </div>
        </div>

        <!-- Edit Form -->
        <form method="POST" class="form" id="editQRForm">
            <!-- Change Detection Warning -->
            <div class="change-warning" id="changeWarning" style="display: none;">
                <div class="warning-header">
                    <i class="fas fa-exclamation-triangle"></i>
                    <span>Changes Detected</span>
                </div>
                <div class="warning-content">
                    <p>You have made changes to the QR code information. A new QR code will be generated to reflect these changes.</p>
                    <div class="changes-list" id="changesList">
                        <!-- Dynamic change list will be populated here -->
                    </div>
                </div>
            </div>

            <!-- Basic Information Section -->
            <div class="form-section">
                <div class="section-header">
                    <h3>
                        <i class="fas fa-info-circle"></i>
                        Basic Information
                    </h3>
                    <p>Update the essential details for your QR code</p>
                </div>

                <div class="form-group">
                    <label for="name">
                        <i class="fas fa-tag"></i>
                        QR Code Name
                    </label>
                    <input type="text" id="name" name="name" required 
                           value="{{ qr_code.name }}"
                           placeholder="Enter a descriptive name for this QR code"
                           maxlength="100"
                           data-original="{{ qr_code.name }}">
                    <small class="form-help">This name helps you identify the QR code in your dashboard</small>
                    <div class="character-counter">
                        <span id="nameCounter">{{ qr_code.name|length }}/100</span>
                    </div>
                </div>

                <div class="form-group">
                    <label for="location">
                        <i class="fas fa-map-marker-alt"></i>
                        Location Name
                    </label>
                    <input type="text" id="location" name="location" required 
                           value="{{ qr_code.location }}"
                           placeholder="e.g., Conference Room A, Main Lobby, etc."
                           maxlength="100"
                           data-original="{{ qr_code.location }}">
                    <small class="form-help">The name of the physical location where this QR code will be used</small>
                    <div class="character-counter">
                        <span id="locationCounter">{{ qr_code.location|length }}/100</span>
                    </div>
                </div>
            </div>

            <!-- Location Details Section -->
            <div class="form-section">
                <div class="section-header">
                    <h3>
                        <i class="fas fa-building"></i>
                        Location Details
                    </h3>
                    <p>Update the complete address and event information</p>
                </div>

                <div class="form-group">
                    <label for="location_address">
                        <i class="fas fa-home"></i>
                        Complete Address
                    </label>
                    <textarea id="location_address" name="location_address" required 
                              placeholder="Enter the full address including street, city, state, and ZIP code"
                              rows="3" maxlength="500"
                              data-original="{{ qr_code.location_address }}">{{ qr_code.location_address }}</textarea>
                    <small class="form-help">Include all address details for accurate location identification</small>
                    <div class="character-counter">
                        <span id="addressCounter">{{ qr_code.location_address|length }}/500</span>
                    </div>
                </div>

                <div class="form-group">
                    <label for="location_event">
                        <i class="fas fa-calendar-alt"></i>
                        Event or Purpose
                    </label>
                    <input type="text" id="location_event" name="location_event" required 
                           value="{{ qr_code.location_event }}"
                           placeholder="e.g., Weekly Team Meeting, Customer Check-in, Training Session"
                           maxlength="200"
                           data-original="{{ qr_code.location_event }}">
                    <small class="form-help">Describe the event or purpose for this QR code</small>
                    <div class="character-counter">
                        <span id="eventCounter">{{ qr_code.location_event|length }}/200</span>
                    </div>
                </div>
            </div>

            <!-- Preview New QR Code Section -->
            <div class="form-section">
                <div class="section-header">
                    <h3>
                        <i class="fas fa-eye"></i>
                        Preview Updated QR Code
                    </h3>
                    <p>See how your QR code will look with the new information</p>
                </div>

                <div class="preview-container">
                    <div class="preview-area" id="previewArea">
                        <div class="preview-placeholder">
                            <i class="fas fa-qrcode"></i>
                            <p>Make changes above to see the updated QR code preview</p>
                            <button type="button" class="btn btn-secondary btn-sm" id="generatePreview">
                                <i class="fas fa-sync-alt"></i>
                                Generate Preview
                            </button>
                        </div>
                        <canvas id="previewCanvas" width="250" height="250" style="display: none;"></canvas>
                    </div>
                    
                    <div class="preview-info" id="previewInfo" style="display: none;">
                        <h4>Updated Information</h4>
                        <div class="preview-details">
                            <div class="preview-item">
                                <strong>Name:</strong> <span id="previewName">-</span>
                            </div>
                            <div class="preview-item">
                                <strong>Location:</strong> <span id="previewLocation">-</span>
                            </div>
                            <div class="preview-item">
                                <strong>Event:</strong> <span id="previewEvent">-</span>
                            </div>
                            <div class="preview-item">
                                <strong>Address:</strong> <span id="previewAddress">-</span>
                            </div>
                        </div>
                        
                        <div class="preview-actions">
                            <button type="button" class="btn btn-info btn-sm" onclick="showPreviewModal()">
                                <i class="fas fa-expand-alt"></i>
                                View Full Size
                            </button>
                            <button type="button" class="btn btn-success btn-sm" onclick="downloadPreview()">
                                <i class="fas fa-download"></i>
                                Download Preview
                            </button>
                        </div>
                    </div>
                </div>
            </div>

            <!-- Data Comparison Section -->
            <div class="form-section">
                <div class="section-header">
                    <h3>
                        <i class="fas fa-exchange-alt"></i>
                        Data Comparison
                    </h3>
                    <p>Compare the current and updated QR code data</p>
                </div>

                <div class="comparison-container">
                    <div class="comparison-side">
                        <h4>
                            <i class="fas fa-history"></i>
                            Current Data
                        </h4>
                        <div class="data-preview">
                            <pre id="currentDataPreview">Event: {{ qr_code.location_event }}
Location: {{ qr_code.location }}
Address: {{ qr_code.location_address }}</pre>
                        </div>
                    </div>
                    
                    <div class="comparison-divider">
                        <i class="fas fa-arrow-right"></i>
                    </div>
                    
                    <div class="comparison-side">
                        <h4>
                            <i class="fas fa-edit"></i>
                            Updated Data
                        </h4>
                        <div class="data-preview">
                            <pre id="updatedDataPreview">Make changes above to see updated data...</pre>
                        </div>
                    </div>
                </div>
            </div>

            <!-- Form Actions -->
            <div class="form-actions">
                <a href="{{ url_for('dashboard') }}" class="btn btn-secondary">
                    <i class="fas fa-arrow-left"></i>
                    Back to Dashboard
                </a>
                
                <button type="button" class="btn btn-warning" id="resetChanges">
                    <i class="fas fa-undo"></i>
                    Reset Changes
                </button>
                
                <button type="submit" class="btn btn-primary" id="saveChanges">
                    <i class="fas fa-save"></i>
                    Save Changes
                </button>
            </div>
        </form>
    </div>
</div>

<!-- Current QR Code Modal -->
<div id="currentQRModal" class="modal">
    <div class="modal-content qr-modal">
        <div class="modal-header">
            <h3>Current QR Code - {{ qr_code.name }}</h3>
            <button class="modal-close" onclick="closeCurrentQRModal()">
                <i class="fas fa-times"></i>
            </button>
        </div>
        <div class="modal-body">
            <div class="modal-qr-display">
                <div class="modal-qr-image">
                    <img src="data:image/png;base64,{{ qr_code.qr_code_image }}" 
                         alt="{{ qr_code.name }} QR Code">
                </div>
                <div class="modal-qr-details">
                    <h4>QR Code Information</h4>
                    <div class="modal-detail-item">
                        <i class="fas fa-tag"></i>
                        <span><strong>Name:</strong> {{ qr_code.name }}</span>
                    </div>
                    <div class="modal-detail-item">
                        <i class="fas fa-map-marker-alt"></i>
                        <span><strong>Location:</strong> {{ qr_code.location }}</span>
                    </div>
                    <div class="modal-detail-item">
                        <i class="fas fa-calendar-alt"></i>
                        <span><strong>Event:</strong> {{ qr_code.location_event }}</span>
                    </div>
                    <div class="modal-detail-item">
                        <i class="fas fa-home"></i>
                        <span><strong>Address:</strong> {{ qr_code.location_address }}</span>
                    </div>
                    <div class="modal-detail-item">
                        <i class="fas fa-calendar-plus"></i>
                        <span><strong>Created:</strong> {{ qr_code.created_date.strftime('%B %d, %Y at %H:%M') }}</span>
                    </div>
                    <div class="modal-detail-item">
                        <i class="fas fa-user"></i>
                        <span><strong>Created by:</strong> {{ qr_code.creator.full_name }}</span>
                    </div>
                </div>
            </div>
        </div>
        <div class="modal-footer">
            <button onclick="downloadCurrentQR()" class="btn btn-info">
                <i class="fas fa-download"></i>
                Download Current
            </button>
            <button onclick="closeCurrentQRModal()" class="btn btn-secondary">
                Close
            </button>
        </div>
    </div>
</div>

<!-- Preview QR Code Modal -->
<div id="previewQRModal" class="modal">
    <div class="modal-content qr-modal">
        <div class="modal-header">
            <h3>Updated QR Code Preview</h3>
            <button class="modal-close" onclick="closePreviewModal()">
                <i class="fas fa-times"></i>
            </button>
        </div>
        <div class="modal-body">
            <div class="modal-qr-preview">
                <div class="modal-qr-image">
                    <canvas id="modalPreviewCanvas" width="350" height="350"></canvas>
                </div>
                <div class="modal-qr-info">
                    <h4>Updated QR Code Information</h4>
                    <div class="modal-info-grid">
                        <div class="info-item">
                            <strong>Name:</strong>
                            <span id="modalPreviewName">-</span>
                        </div>
                        <div class="info-item">
                            <strong>Location:</strong>
                            <span id="modalPreviewLocation">-</span>
                        </div>
                        <div class="info-item">
                            <strong>Event:</strong>
                            <span id="modalPreviewEvent">-</span>
                        </div>
                        <div class="info-item">
                            <strong>Address:</strong>
                            <span id="modalPreviewAddress">-</span>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <div class="modal-footer">
            <button onclick="downloadPreviewQR()" class="btn btn-success">
                <i class="fas fa-download"></i>
                Download Preview
            </button>
            <button onclick="closePreviewModal()" class="btn btn-secondary">
                Close Preview
            </button>
        </div>
    </div>
</div>
{% endblock %}

{% block extra_scripts %}
<!-- QR Code Generation Library -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/qrious/4.0.2/qrious.min.js"></script>

<script>
document.addEventListener('DOMContentLoaded', function() {
    initializeQRCodeEditing();
});

// Global variables
let originalData = {};
let hasChanges = false;

function initializeQRCodeEditing() {
    const form = document.getElementById('editQRForm');
    
    // Store original data
    storeOriginalData();
    
    // Initialize character counters
    initializeCharacterCounters();
    
    // Initialize change detection
    initializeChangeDetection();
    
    // Initialize preview functionality
    initializePreviewFunctionality();
    
    // Form submission handling
    form.addEventListener('submit', function(e) {
        if (!validateForm()) {
            e.preventDefault();
            return false;
        }
        
        if (!hasChanges) {
            e.preventDefault();
            showToast('No changes detected. Please modify the information to update the QR code.', 'info');
            return false;
        }
        
        // Confirm changes before submission
        if (!confirmSaveChanges()) {
            e.preventDefault();
            return false;
        }
        
        // Show loading state
        const submitBtn = form.querySelector('button[type="submit"]');
        submitBtn.innerHTML = '<i class="fas fa-spinner fa-spin"></i> Saving Changes...';
        submitBtn.disabled = true;
    });
    
    // Reset changes functionality
    document.getElementById('resetChanges').addEventListener('click', resetAllChanges);
    
    // Generate preview functionality
    document.getElementById('generatePreview').addEventListener('click', function() {
        if (validateForm()) {
            generateQRPreview();
        }
    });
}

function storeOriginalData() {
    originalData = {
        name: document.getElementById('name').dataset.original,
        location: document.getElementById('location').dataset.original,
        location_address: document.getElementById('location_address').dataset.original,
        location_event: document.getElementById('location_event').dataset.original
    };
}

function initializeCharacterCounters() {
    const counters = [
        { input: 'name', counter: 'nameCounter', max: 100 },
        { input: 'location', counter: 'locationCounter', max: 100 },
        { input: 'location_address', counter: 'addressCounter', max: 500 },
        { input: 'location_event', counter: 'eventCounter', max: 200 }
    ];
    
    counters.forEach(item => {
        const input = document.getElementById(item.input);
        const counter = document.getElementById(item.counter);
        
        if (input && counter) {
            input.addEventListener('input', function() {
                const length = this.value.length;
                counter.textContent = `${length}/${item.max}`;
                
                if (length > item.max * 0.9) {
                    counter.classList.add('warning');
                } else {
                    counter.classList.remove('warning');
                }
            });
        }
    });
}

function initializeChangeDetection() {
    const inputs = document.querySelectorAll('#name, #location, #location_address, #location_event');
    
    inputs.forEach(input => {
        input.addEventListener('input', function() {
            detectChanges();
            updateDataComparison();
        });
        
        input.addEventListener('blur', function() {
            validateField(this);
        });
    });
}

function detectChanges() {
    const currentData = {
        name: document.getElementById('name').value.trim(),
        location: document.getElementById('location').value.trim(),
        location_address: document.getElementById('location_address').value.trim(),
        location_event: document.getElementById('location_event').value.trim()
    };
    
    const changes = [];
    let hasAnyChanges = false;
    
    Object.keys(originalData).forEach(key => {
        if (currentData[key] !== originalData[key]) {
            changes.push({
                field: key,
                original: originalData[key],
                current: currentData[key]
            });
            hasAnyChanges = true;
        }
    });
    
    hasChanges = hasAnyChanges;
    updateChangeWarning(changes);
    updateSaveButton();
}

function updateChangeWarning(changes) {
    const warningDiv = document.getElementById('changeWarning');
    const changesList = document.getElementById('changesList');
    
    if (changes.length > 0) {
        let changesHTML = '<ul>';
        changes.forEach(change => {
            const fieldName = getFieldDisplayName(change.field);
            changesHTML += `
                <li>
                    <strong>${fieldName}:</strong>
                    <br>
                    <span class="change-from">From: "${change.original}"</span>
                    <br>
                    <span class="change-to">To: "${change.current}"</span>
                </li>
            `;
        });
        changesHTML += '</ul>';
        
        changesList.innerHTML = changesHTML;
        warningDiv.style.display = 'block';
        warningDiv.classList.add('fade-in');
    } else {
        warningDiv.style.display = 'none';
        warningDiv.classList.remove('fade-in');
    }
}

function getFieldDisplayName(fieldName) {
    const fieldNames = {
        name: 'QR Code Name',
        location: 'Location Name',
        location_address: 'Complete Address',
        location_event: 'Event or Purpose'
    };
    return fieldNames[fieldName] || fieldName;
}

function updateSaveButton() {
    const saveBtn = document.getElementById('saveChanges');
    
    if (hasChanges) {
        saveBtn.classList.remove('btn-primary');
        saveBtn.classList.add('btn-success');
        saveBtn.innerHTML = '<i class="fas fa-save"></i> Save Changes';
        saveBtn.disabled = false;
    } else {
        saveBtn.classList.remove('btn-success');
        saveBtn.classList.add('btn-primary');
        saveBtn.innerHTML = '<i class="fas fa-save"></i> No Changes';
        saveBtn.disabled = true;
    }
}

function updateDataComparison() {
    const currentData = {
        name: document.getElementById('name').value.trim(),
        location: document.getElementById('location').value.trim(),
        location_address: document.getElementById('location_address').value.trim(),
        location_event: document.getElementById('location_event').value.trim()
    };
    
    let updatedDataText = '';
    if (currentData.location_event) updatedDataText += `Event: ${currentData.location_event}\n`;
    if (currentData.location) updatedDataText += `Location: ${currentData.location}\n`;
    if (currentData.location_address) updatedDataText += `Address: ${currentData.location_address}`;
    
    document.getElementById('updatedDataPreview').textContent = 
        updatedDataText || 'No data to preview...';
}

function initializePreviewFunctionality() {
    // Auto-update preview info when form changes
    const inputs = document.querySelectorAll('#name, #location, #location_address, #location_event');
    
    inputs.forEach(input => {
        input.addEventListener('input', updatePreviewInfo);
    });
}

function updatePreviewInfo() {
    const name = document.getElementById('name').value.trim() || '-';
    const location = document.getElementById('location').value.trim() || '-';
    const event = document.getElementById('location_event').value.trim() || '-';
    const address = document.getElementById('location_address').value.trim() || '-';
    
    document.getElementById('previewName').textContent = name;
    document.getElementById('previewLocation').textContent = location;
    document.getElementById('previewEvent').textContent = event;
    document.getElementById('previewAddress').textContent = address;
}

function generateQRPreview() {
    const name = document.getElementById('name').value.trim();
    const location = document.getElementById('location').value.trim();
    const address = document.getElementById('location_address').value.trim();
    const event = document.getElementById('location_event').value.trim();
    
    if (!name || !location || !address || !event) {
        showToast('Please fill in all required fields before generating preview', 'warning');
        return;
    }
    
    // Generate QR code data
    const qrData = `Event: ${event}\nLocation: ${location}\nAddress: ${address}`;
    
    // Generate QR code
    const canvas = document.getElementById('previewCanvas');
    const qr = new QRious({
        element: canvas,
        value: qrData,
        size: 250,
        level: 'M'
    });
    
    // Show preview
    document.querySelector('.preview-placeholder').style.display = 'none';
    canvas.style.display = 'block';
    document.getElementById('previewInfo').style.display = 'block';
    
    // Update preview info
    updatePreviewInfo();
    
    showToast('QR code preview generated successfully!', 'success');
}

function showPreviewModal() {
    const canvas = document.getElementById('previewCanvas');
    if (canvas.style.display === 'none') {
        showToast('Please generate a preview first', 'warning');
        return;
    }
    
    // Copy canvas to modal
    const modalCanvas = document.getElementById('modalPreviewCanvas');
    const modalContext = modalCanvas.getContext('2d');
    modalContext.clearRect(0, 0, modalCanvas.width, modalCanvas.height);
    modalContext.drawImage(canvas, 0, 0, modalCanvas.width, modalCanvas.height);
    
    // Update modal info
    document.getElementById('modalPreviewName').textContent = document.getElementById('previewName').textContent;
    document.getElementById('modalPreviewLocation').textContent = document.getElementById('previewLocation').textContent;
    document.getElementById('modalPreviewEvent').textContent = document.getElementById('previewEvent').textContent;
    document.getElementById('modalPreviewAddress').textContent = document.getElementById('previewAddress').textContent;
    
    // Show modal
    const modal = document.getElementById('previewQRModal');
    modal.style.display = 'flex';
    setTimeout(() => modal.classList.add('show'), 10);
}

function closePreviewModal() {
    const modal = document.getElementById('previewQRModal');
    modal.classList.remove('show');
    setTimeout(() => {
        modal.style.display = 'none';
    }, 200);
}

function showCurrentQRModal() {
    const modal = document.getElementById('currentQRModal');
    modal.style.display = 'flex';
    setTimeout(() => modal.classList.add('show'), 10);
}

function closeCurrentQRModal() {
    const modal = document.getElementById('currentQRModal');
    modal.classList.remove('show');
    setTimeout(() => {
        modal.style.display = 'none';
    }, 200);
}

function downloadCurrentQR() {
    const qrImage = '{{ qr_code.qr_code_image }}';
    const qrName = '{{ qr_code.name }}';
    
    const link = document.createElement('a');
    link.href = 'data:image/png;base64,' + qrImage;
    link.download = qrName.replace(/[^a-z0-9]/gi, '_').toLowerCase() + '_current_qr.png';
    link.click();
    
    showToast('Current QR code downloaded!', 'success');
}

function downloadPreview() {
    const canvas = document.getElementById('previewCanvas');
    if (canvas.style.display === 'none') {
        showToast('Please generate a preview first', 'warning');
        return;
    }
    
    const name = document.getElementById('name').value.trim();
    const link = document.createElement('a');
    link.download = name.replace(/[^a-z0-9]/gi, '_').toLowerCase() + '_updated_preview.png';
    link.href = canvas.toDataURL();
    link.click();
    
    showToast('Preview QR code downloaded!', 'success');
}

function downloadPreviewQR() {
    const canvas = document.getElementById('modalPreviewCanvas');
    const name = document.getElementById('name').value.trim();
    
    const link = document.createElement('a');
    link.download = name.replace(/[^a-z0-9]/gi, '_').toLowerCase() + '_updated_preview.png';
    link.href = canvas.toDataURL();
    link.click();
    
    showToast('Preview QR code downloaded!', 'success');
}

function resetAllChanges() {
    if (!hasChanges) {
        showToast('No changes to reset', 'info');
        return;
    }
    
    if (!confirm('Are you sure you want to reset all changes? This will restore the original values.')) {
        return;
    }
    
    // Reset all form fields to original values
    document.getElementById('name').value = originalData.name;
    document.getElementById('location').value = originalData.location;
    document.getElementById('location_address').value = originalData.location_address;
    document.getElementById('location_event').value = originalData.location_event;
    
    // Update character counters
    document.getElementById('nameCounter').textContent = `${originalData.name.length}/100`;
    document.getElementById('locationCounter').textContent = `${originalData.location.length}/100`;
    document.getElementById('addressCounter').textContent = `${originalData.location_address.length}/500`;
    document.getElementById('eventCounter').textContent = `${originalData.location_event.length}/200`;
    
    // Reset preview
    document.querySelector('.preview-placeholder').style.display = 'block';
    document.getElementById('previewCanvas').style.display = 'none';
    document.getElementById('previewInfo').style.display = 'none';
    
    // Clear errors
    clearAllErrors();
    
    // Re-detect changes (should be none now)
    detectChanges();
    updateDataComparison();
    
    showToast('All changes have been reset', 'success');
}

function validateForm() {
    const requiredFields = [
        { id: 'name', name: 'QR Code Name' },
        { id: 'location', name: 'Location Name' },
        { id: 'location_address', name: 'Complete Address' },
        { id: 'location_event', name: 'Event or Purpose' }
    ];
    
    let isValid = true;
    
    requiredFields.forEach(field => {
        if (!validateField(document.getElementById(field.id))) {
            isValid = false;
        }
    });
    
    return isValid;
}

function validateField(input) {
    const value = input.value.trim();
    
    if (input.hasAttribute('required') && !value) {
        showFieldError(input, 'This field is required');
        return false;
    }
    
    // Specific field validations
    if (input.id === 'name' && value && value.length < 3) {
        showFieldError(input, 'Name must be at least 3 characters');
        return false;
    }
    
    if (input.id === 'location_address' && value && value.length < 10) {
        showFieldError(input, 'Please provide a complete address');
        return false;
    }
    
    clearFieldError(input);
    return true;
}

function showFieldError(input, message) {
    const formGroup = input.closest('.form-group');
    formGroup.classList.add('has-error');
    
    let errorElement = formGroup.querySelector('.error-message');
    if (!errorElement) {
        errorElement = document.createElement('div');
        errorElement.className = 'error-message';
        formGroup.appendChild(errorElement);
    }
    
    errorElement.textContent = message;
}

function clearFieldError(input) {
    const formGroup = input.closest('.form-group');
    formGroup.classList.remove('has-error');
    
    const errorElement = formGroup.querySelector('.error-message');
    if (errorElement) {
        errorElement.remove();
    }
}

function clearAllErrors() {
    const errorMessages = document.querySelectorAll('.error-message');
    errorMessages.forEach(error => error.remove());
    
    const errorGroups = document.querySelectorAll('.form-group.has-error');
    errorGroups.forEach(group => group.classList.remove('has-error'));
}

function confirmSaveChanges() {
    const changeCount = Object.keys(originalData).filter(key => {
        const currentValue = document.getElementById(key).value.trim();
        return currentValue !== originalData[key];
    }).length;
    
    return confirm(
        `You have made ${changeCount} change${changeCount !== 1 ? 's' : ''} to this QR code.\n\n` +
        'Saving will generate a new QR code with the updated information.\n\n' +
        'Are you sure you want to continue?'
    );
}

function showToast(message, type = 'info') {
    const toast = document.createElement('div');
    toast.className = `toast toast-${type}`;
    toast.innerHTML = `
        <div class="toast-content">
            <i class="fas ${getToastIcon(type)}"></i>
            <span>${message}</span>
        </div>
    `;
    
    toast.style.cssText = `
        position: fixed;
        top: 20px;
        right: 20px;
        background: white;
        border-radius: 8px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        padding: 1rem;
        z-index: 1000;
        opacity: 0;
        transform: translateX(100%);
        transition: all 0.3s ease;
        border-left: 4px solid ${getToastColor(type)};
        max-width: 400px;
    `;
    
    document.body.appendChild(toast);
    
    setTimeout(() => {
        toast.style.opacity = '1';
        toast.style.transform = 'translateX(0)';
    }, 100);
    
    setTimeout(() => {
        toast.style.opacity = '0';
        toast.style.transform = 'translateX(100%)';
        setTimeout(() => {
            if (document.body.contains(toast)) {
                document.body.removeChild(toast);
            }
        }, 300);
    }, 4000);
}

function getToastIcon(type) {
    const icons = {
        success: 'fa-check-circle',
        error: 'fa-exclamation-circle',
        warning: 'fa-exclamation-triangle',
        info: 'fa-info-circle'
    };
    return icons[type] || icons.info;
}

function getToastColor(type) {
    const colors = {
        success: '#059669',
        error: '#dc2626',
        warning: '#d97706',
        info: '#0891b2'
    };
    return colors[type] || colors.info;
}

// Close modals when clicking outside
document.addEventListener('click', function(e) {
    const previewModal = document.getElementById('previewQRModal');
    const currentModal = document.getElementById('currentQRModal');
    
    if (e.target === previewModal) {
        closePreviewModal();
    }
    
    if (e.target === currentModal) {
        closeCurrentQRModal();
    }
});

// Close modals with Escape key
document.addEventListener('keydown', function(e) {
    if (e.key === 'Escape') {
        closePreviewModal();
        closeCurrentQRModal();
    }
});

// Warn user about unsaved changes when leaving page
window.addEventListener('beforeunload', function(e) {
    if (hasChanges) {
        e.preventDefault();
        e.returnValue = '';
        return 'You have unsaved changes. Are you sure you want to leave?';
    }
});
</script>

<style>
/* Edit QR Code Page Specific Styles */
.form-page {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1rem;
}

.form-card {
    background: var(--white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow);
    padding: 2rem;
    margin-bottom: 2rem;
}

.form-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
}

.form-header h1 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.form-header p {
    color: var(--gray-500);
    font-size: 1rem;
}

/* Current QR Code Section */
.current-qr-section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--gray-50), var(--white));
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-200);
}

.current-qr-header {
    text-align: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--gray-200);
}

.current-qr-header h3 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

.current-qr-header p {
    color: var(--gray-600);
    font-size: 0.875rem;
}

.current-qr-display {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 2rem;
    align-items: center;
}

.current-qr-image {
    position: relative;
    background: var(--white);
    padding: 1rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: var(--transition);
}

.current-qr-image:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.current-qr-image img {
    width: 150px;
    height: 150px;
    border-radius: var(--radius);
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    color: var(--white);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    opacity: 0;
    transition: var(--transition);
}

.current-qr-image:hover .image-overlay {
    opacity: 1;
}

.image-overlay i {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.current-qr-info {
    display: grid;
    gap: 1.5rem;
}

.qr-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--gray-600);
    background: var(--white);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
}

.meta-item i {
    color: var(--primary-color);
}

.current-details {
    display: grid;
    gap: 0.75rem;
}

.detail-row {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 0.5rem;
    font-size: 0.875rem;
    padding: 0.5rem;
    background: var(--white);
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
}

.detail-row strong {
    color: var(--gray-700);
    font-weight: 600;
}

.detail-row span {
    color: var(--gray-900);
}

.address-text {
    word-break: break-word;
    line-height: 1.4;
}

/* Change Warning Section */
.change-warning {
    margin-bottom: 2rem;
    padding: 1rem;
    background: rgba(217, 119, 6, 0.1);
    border: 1px solid var(--warning-color);
    border-radius: var(--radius-lg);
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.change-warning.fade-in {
    opacity: 1;
    transform: translateY(0);
}

.warning-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--warning-color);
    margin-bottom: 0.75rem;
}

.warning-content p {
    color: #92400e;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.changes-list ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 0.75rem;
}

.changes-list li {
    padding: 0.75rem;
    background: var(--white);
    border-radius: var(--radius);
    border-left: 3px solid var(--warning-color);
    font-size: 0.875rem;
}

.change-from {
    color: var(--danger-color);
    font-style: italic;
}

.change-to {
    color: var(--success-color);
    font-weight: 500;
}

/* Form Sections */
.form-section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-200);
}

.section-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--gray-200);
}

.section-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

.section-header p {
    color: var(--gray-600);
    font-size: 0.875rem;
}

/* Form Groups */
.form-group {
    position: relative;
    margin-bottom: 1.5rem;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    transition: var(--transition);
    background-color: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-help {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--gray-500);
}

/* Character Counters */
.character-counter {
    position: absolute;
    bottom: -1.5rem;
    right: 0;
    font-size: 0.75rem;
    color: var(--gray-400);
}

.character-counter.warning {
    color: var(--warning-color);
    font-weight: 600;
}

/* Preview Container */
.preview-container {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 2rem;
    align-items: center;
}

.preview-area {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 250px;
    background: var(--white);
    border-radius: var(--radius-lg);
    border: 2px dashed var(--gray-300);
    padding: 1rem;
}

.preview-placeholder {
    text-align: center;
    color: var(--gray-500);
}

.preview-placeholder i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--gray-400);
}

.preview-placeholder p {
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.preview-info {
    padding: 1rem;
    background: var(--white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
}

.preview-info h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.preview-details {
    display: grid;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.preview-item {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.preview-item strong {
    color: var(--gray-700);
    font-weight: 600;
}

.preview-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Data Comparison */
.comparison-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1rem;
    align-items: center;
}

.comparison-side h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 0.75rem;
}

.data-preview {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 1rem;
    min-height: 120px;
}

.data-preview pre {
    margin: 0;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--gray-700);
    white-space: pre-wrap;
    word-wrap: break-word;
    line-height: 1.4;
}

.comparison-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    font-size: 1.125rem;
}

/* Form Actions */
.form-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--gray-200);
}

/* Error States */
.form-group.has-error input,
.form-group.has-error select,
.form-group.has-error textarea {
    border-color: var(--danger-color);
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.error-message {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--danger-color);
    font-weight: 500;
}

/* Button States */
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn.btn-success {
    background: var(--success-color);
    color: var(--white);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(5, 150, 105, 0); }
    100% { box-shadow: 0 0 0 0 rgba(5, 150, 105, 0); }
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    opacity: 1;
}

.modal-content.qr-modal {
    max-width: 700px;
    width: 100%;
}

.modal-qr-display,
.modal-qr-preview {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 2rem;
    align-items: center;
}

.modal-qr-image {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
}

.modal-qr-image img {
    max-width: 250px;
    height: auto;
    border-radius: var(--radius);
}

.modal-qr-details,
.modal-qr-info {
    display: grid;
    gap: 1rem;
}

.modal-qr-details h4,
.modal-qr-info h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.modal-detail-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.5rem;
    background: var(--white);
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
    font-size: 0.875rem;
}

.modal-detail-item i {
    color: var(--primary-color);
    width: 16px;
    margin-top: 0.125rem;
}

.modal-info-grid {
    display: grid;
    gap: 0.75rem;
}

.info-item {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.info-item strong {
    color: var(--gray-700);
    font-weight: 600;
}

.info-item span {
    color: var(--gray-900);
    word-break: break-word;
}

/* Responsive Design */
@media (max-width: 768px) {
    .form-page {
        padding: 0 0.5rem;
    }
    
    .form-card {
        padding: 1.5rem;
    }
    
    .form-section {
        padding: 1rem;
    }
    
    .current-qr-display {
        grid-template-columns: 1fr;
        gap: 1rem;
        text-align: center;
    }
    
    .qr-meta {
        justify-content: center;
    }
    
    .detail-row {
        grid-template-columns: 1fr;
        gap: 0.25rem;
        text-align: center;
    }
    
    .preview-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .comparison-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .comparison-divider {
        transform: rotate(90deg);
    }
    
    .form-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .modal-qr-display,
    .modal-qr-preview {
        grid-template-columns: 1fr;
        gap: 1rem;
        text-align: center;
    }
    
    .info-item {
        grid-template-columns: 1fr;
        gap: 0.25rem;
    }
    
    .character-counter {
        position: static;
        text-align: right;
        margin-top: 0.5rem;
    }
}

@media (max-width: 480px) {
    .form-header h1 {
        font-size: 1.5rem;
        flex-direction: column;
        gap: 0.25rem;
    }
    
    .section-header h3 {
        font-size: 1.125rem;
        flex-direction: column;
        gap: 0.25rem;
        text-align: center;
    }
    
    .modal-content {
        margin: 0.5rem;
        max-height: calc(100vh - 1rem);
    }
    
    .current-qr-image img {
        width: 120px;
        height: 120px;
    }
    
    .preview-actions {
        flex-direction: column;
    }
}

/* Loading States */
.btn.loading {
    position: relative;
    pointer-events: none;
}

.btn.loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Focus Styles for Accessibility */
.btn:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .form-section {
        border: 2px solid var(--gray-600);
    }
    
    .current-qr-section {
        border: 2px solid var(--primary-color);
    }
    
    .change-warning {
        border: 2px solid var(--warning-color);
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .change-warning {
        opacity: 1;
        transform: none;
    }
    
    .btn.btn-success {
        animation: none;
    }
}

/* Print Styles */
@media print {
    .form-actions,
    .modal,
    .character-counter,
    .preview-actions,
    .change-warning {
        display: none !important;
    }
    
    .form-page {
        max-width: none;
        padding: 0;
    }
    
    .form-card {
        box-shadow: none;
        border: 1px solid #000;
    }
    
    .form-section {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #000;
    }
}

/* Toast Notification Styles */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 1rem;
    z-index: 1000;
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.3s ease;
    max-width: 400px;
    border-left: 4px solid;
}

.toast.show {
    opacity: 1;
    transform: translateX(0);
}

.toast-content {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
}

.toast.toast-success { border-left-color: var(--success-color); }
.toast.toast-error { border-left-color: var(--danger-color); }
.toast.toast-warning { border-left-color: var(--warning-color); }
.toast.toast-info { border-left-color: var(--info-color); }

.toast.toast-success .toast-content { color: var(--success-color); }
.toast.toast-error .toast-content { color: var(--danger-color); }
.toast.toast-warning .toast-content { color: var(--warning-color); }
.toast.toast-info .toast-content { color: var(--info-color); }

/* Fade-in Animation */
.fade-in {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Canvas Styling */
canvas {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

/* Enhanced Modal Styles */
.modal-content {
    background: var(--white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideUp 0.3s ease-out;
}

@keyframes modalSlideUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
}

.modal-close {
    background: none;
    border: none;
    padding: 0.5rem;
    border-radius: var(--radius);
    cursor: pointer;
    color: var(--gray-500);
    transition: var(--transition);
}

.modal-close:hover {
    background-color: var(--gray-100);
    color: var(--gray-700);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1.5rem;
    border-top: 1px solid var(--gray-200);
}
</style>
{% endblock %}