/**
 * Enhanced Form Functionality
 * Provides enhanced HTMX form interactions and state management
 */
class FormEnhancement {
    constructor() {
        this.init();
    }

    init() {
        this.setupHTMXEnhancements();
        this.setupFormValidation();
        this.setupLoadingStates();
        this.setupFormPersistence();
        this.setupAccessibilityEnhancements();
    }

    setupHTMXEnhancements() {
        // Global HTMX configuration
        document.addEventListener('DOMContentLoaded', () => {
            if (!document.body) {
                console.warn('FormEnhancement: document.body not available');
                return;
            }

            // Add loading indicators to HTMX requests
            document.body.addEventListener('htmx:beforeRequest', (e) => {
                this.showRequestLoading(e.target);
            });

            document.body.addEventListener('htmx:afterRequest', (e) => {
                this.hideRequestLoading(e.target);
                
                // Re-initialize components after HTMX swaps
                this.reinitializeComponents(e.target);
            });

            // Handle HTMX errors gracefully
            document.body.addEventListener('htmx:responseError', (e) => {
                this.handleHTMXError(e);
            });

            // Form-specific HTMX handling
            document.body.addEventListener('htmx:beforeSwap', (e) => {
                this.handleBeforeSwap(e);
            });

            document.body.addEventListener('htmx:afterSwap', (e) => {
                this.handleAfterSwap(e);
            });
        });
    }

    setupFormValidation() {
        // Enhanced form validation with real-time feedback
        document.addEventListener('input', (e) => {
            if (e.target.matches('input, textarea, select')) {
                this.validateField(e.target);
            }
        });

        document.addEventListener('blur', (e) => {
            if (e.target.matches('input, textarea, select')) {
                this.validateField(e.target, true);
            }
        });
    }

    setupLoadingStates() {
        // Enhanced loading states for better UX
        const style = document.createElement('style');
        style.textContent = `
            .form-loading {
                position: relative;
                pointer-events: none;
                opacity: 0.7;
            }
            
            .form-loading::after {
                content: '';
                position: absolute;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                background: rgba(255, 255, 255, 0.8);
                display: flex;
                align-items: center;
                justify-content: center;
                z-index: 1000;
            }
            
            .form-loading::before {
                content: '';
                position: absolute;
                top: 50%;
                left: 50%;
                width: 20px;
                height: 20px;
                margin: -10px 0 0 -10px;
                border: 2px solid #dbdbdb;
                border-top-color: #3273dc;
                border-radius: 50%;
                animation: spin 1s linear infinite;
                z-index: 1001;
            }
            
            @keyframes spin {
                to { transform: rotate(360deg); }
            }
            
            .field-error {
                animation: shake 0.5s ease-in-out;
            }
            
            @keyframes shake {
                0%, 20%, 40%, 60%, 80%, 100% { transform: translateX(0); }
                10%, 30%, 50%, 70%, 90% { transform: translateX(-3px); }
            }
            
            .venue-search-container {
                position: relative;
            }
            
            .venue-suggestions {
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                border: 1px solid #dbdbdb;
                border-top: none;
                border-radius: 0 0 4px 4px;
                box-shadow: 0 8px 16px rgba(10, 10, 10, 0.1);
                z-index: 1000;
                max-height: 300px;
                overflow-y: auto;
                display: none;
            }
            
            .venue-suggestion-item {
                padding: 12px;
                border-bottom: 1px solid #f5f5f5;
                cursor: pointer;
                transition: background-color 0.2s;
            }
            
            .venue-suggestion-item:hover,
            .venue-suggestion-item.is-active {
                background-color: #f5f5f5;
            }
            
            .venue-suggestion-item:last-child {
                border-bottom: none;
            }
            
            .venue-name {
                font-weight: 600;
                color: #363636;
            }
            
            .venue-address {
                color: #757575;
                font-size: 0.875rem;
                margin-top: 2px;
            }
            
            .venue-category-icon {
                color: #3273dc;
                margin-right: 8px;
            }
            
            .venue-quality {
                margin-top: 4px;
            }
            
            .venue-quality .icon {
                color: #ffdd57;
            }
            
            .venue-selected {
                border: 1px solid #48c774;
                border-radius: 6px;
                padding: 16px;
                background-color: #f6fbf6;
            }
            
            .venue-info {
                margin-bottom: 12px;
            }
            
            .venue-map-preview {
                height: 120px;
                border-radius: 4px;
                margin-bottom: 12px;
                background-color: #f5f5f5;
                position: relative;
                overflow: hidden;
            }
            
            .event-mini-map {
                height: 150px;
                border-radius: 6px;
                margin: 12px 0;
                background-color: #f5f5f5;
                position: relative;
                overflow: hidden;
            }
            
            .map-loading {
                position: absolute;
                top: 50%;
                left: 50%;
                transform: translate(-50%, -50%);
                color: #757575;
            }
            
            .show-full-map {
                margin-top: 8px;
            }
            
            .location-info {
                display: flex;
                align-items: center;
                margin-bottom: 8px;
            }
            
            .location-info .icon {
                margin-right: 8px;
                color: #3273dc;
            }
            
            .enhanced-event-view {
                border: 1px solid #dbdbdb;
                border-radius: 6px;
                padding: 20px;
                margin-bottom: 20px;
                background: white;
                box-shadow: 0 2px 4px rgba(10, 10, 10, 0.1);
                transition: box-shadow 0.3s ease;
            }
            
            .enhanced-event-view:hover {
                box-shadow: 0 4px 8px rgba(10, 10, 10, 0.15);
            }
            
            .event-location-enhanced {
                margin: 12px 0;
                padding: 12px;
                background-color: #f8f9fa;
                border-radius: 6px;
                border-left: 4px solid #3273dc;
            }
            
            .rsvp-actions {
                margin-top: 12px;
            }
            
            .rsvp-actions .button {
                margin-right: 8px;
                margin-bottom: 8px;
            }
            
            .rsvp-counts {
                display: flex;
                gap: 16px;
                margin-bottom: 8px;
            }
            
            .rsvp-count {
                display: flex;
                align-items: center;
                gap: 4px;
                color: #757575;
                font-size: 0.875rem;
            }
            
            .rsvp-count .icon {
                color: #3273dc;
            }
            
            .rsvp-count .count {
                font-weight: 600;
                color: #363636;
            }
        `;
        document.head.appendChild(style);
    }

    setupFormPersistence() {
        // Save form data to localStorage to prevent data loss
        const formElements = document.querySelectorAll('form[hx-post]');
        
        formElements.forEach(form => {
            const formId = this.getFormId(form);
            
            // Load saved data
            this.loadFormData(form, formId);
            
            // Save data on input
            form.addEventListener('input', () => {
                this.saveFormData(form, formId);
            });
            
            // Clear saved data on successful submit
            form.addEventListener('htmx:afterRequest', (e) => {
                if (e.detail.successful) {
                    this.clearFormData(formId);
                }
            });
        });
    }

    setupAccessibilityEnhancements() {
        // Enhanced accessibility features
        document.addEventListener('DOMContentLoaded', () => {
            // Add skip links for better keyboard navigation
            this.addSkipLinks();
            
            // Enhance focus management
            this.setupFocusManagement();
            
            // Add ARIA live regions for dynamic content
            this.setupLiveRegions();
        });
    }

    showRequestLoading(element) {
        // Add loading state to the target element
        const target = element.hasAttribute('hx-target') ? 
            document.querySelector(element.getAttribute('hx-target')) : element;
            
        if (target) {
            target.classList.add('form-loading');
        }
        
        // Also add loading to button if it's a button
        if (element.tagName === 'BUTTON') {
            element.classList.add('is-loading');
            element.disabled = true;
        }
    }

    hideRequestLoading(element) {
        // Remove loading state
        const target = element.hasAttribute('hx-target') ? 
            document.querySelector(element.getAttribute('hx-target')) : element;
            
        if (target) {
            target.classList.remove('form-loading');
        }
        
        // Remove button loading state
        if (element.tagName === 'BUTTON') {
            element.classList.remove('is-loading');
            element.disabled = false;
        }
    }

    reinitializeComponents(target) {
        // Reinitialize venue search if needed
        const venueInput = target.querySelector('#venue-search-input');
        const venueSuggestions = target.querySelector('#venue-suggestions');
        
        if (venueInput && venueSuggestions && !window.venueSearch) {
            window.venueSearch = new VenueSearch('venue-search-input', 'venue-suggestions');
        }
        
        // Reinitialize mini maps
        const miniMaps = target.querySelectorAll('.event-mini-map[data-lat][data-lng]');
        miniMaps.forEach(mapContainer => {
            const lat = parseFloat(mapContainer.dataset.lat);
            const lng = parseFloat(mapContainer.dataset.lng);
            const venueName = mapContainer.dataset.venueName || 'Event Location';
            
            if (lat && lng && !mapContainer.querySelector('.maplibregl-map')) {
                initializeMiniMap(mapContainer, lat, lng, venueName);
            }
        });
    }

    handleHTMXError(e) {
        console.error('HTMX request error:', e);
        
        // Show user-friendly error message
        this.showErrorNotification('Something went wrong. Please try again.');
        
        // Remove loading states
        this.hideRequestLoading(e.target);
    }

    handleBeforeSwap(e) {
        // Store focus information before swap
        const activeElement = document.activeElement;
        if (activeElement && activeElement.id) {
            this.lastFocusedId = activeElement.id;
        }
    }

    handleAfterSwap(e) {
        // Restore focus after swap if possible
        if (this.lastFocusedId) {
            const element = document.getElementById(this.lastFocusedId);
            if (element) {
                element.focus();
            }
            this.lastFocusedId = null;
        }
        
        // Announce content change to screen readers
        this.announceContentChange('Form updated');
    }

    validateField(field, showErrors = false) {
        const value = field.value.trim();
        const fieldContainer = field.closest('.field');
        const helpElement = fieldContainer?.querySelector('.help');
        
        // Remove existing error states
        field.classList.remove('is-danger');
        fieldContainer?.classList.remove('field-error');
        
        // Basic validation
        if (field.required && !value) {
            if (showErrors) {
                this.showFieldError(field, 'This field is required');
            }
            return false;
        }
        
        // Email validation
        if (field.type === 'email' && value) {
            const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
            if (!emailRegex.test(value)) {
                if (showErrors) {
                    this.showFieldError(field, 'Please enter a valid email address');
                }
                return false;
            }
        }
        
        // Length validation
        if (field.minLength && value.length < field.minLength) {
            if (showErrors) {
                this.showFieldError(field, `Minimum length is ${field.minLength} characters`);
            }
            return false;
        }
        
        // Custom validation for event name
        if (field.name === 'name' && value.length < 10) {
            if (showErrors) {
                this.showFieldError(field, 'Event name must be at least 10 characters');
            }
            return false;
        }
        
        // Clear any existing errors
        this.clearFieldError(field);
        return true;
    }

    showFieldError(field, message) {
        field.classList.add('is-danger');
        const fieldContainer = field.closest('.field');
        fieldContainer?.classList.add('field-error');
        
        let helpElement = fieldContainer?.querySelector('.help.is-danger');
        if (!helpElement) {
            helpElement = document.createElement('p');
            helpElement.className = 'help is-danger';
            field.parentNode.appendChild(helpElement);
        }
        
        helpElement.textContent = message;
        
        // Announce error to screen readers
        this.announceError(message);
    }

    clearFieldError(field) {
        field.classList.remove('is-danger');
        const fieldContainer = field.closest('.field');
        fieldContainer?.classList.remove('field-error');
        
        const errorHelp = fieldContainer?.querySelector('.help.is-danger');
        if (errorHelp) {
            errorHelp.remove();
        }
    }

    getFormId(form) {
        // Generate a unique ID for form persistence
        const action = form.getAttribute('hx-post') || form.action;
        return `form_${btoa(action).replace(/[^a-zA-Z0-9]/g, '')}`;
    }

    saveFormData(form, formId) {
        const formData = new FormData(form);
        const data = {};
        
        for (let [key, value] of formData.entries()) {
            data[key] = value;
        }
        
        try {
            localStorage.setItem(formId, JSON.stringify(data));
        } catch (e) {
            console.warn('Could not save form data:', e);
        }
    }

    loadFormData(form, formId) {
        try {
            const savedData = localStorage.getItem(formId);
            if (!savedData) return;
            
            const data = JSON.parse(savedData);
            
            Object.keys(data).forEach(key => {
                const field = form.querySelector(`[name="${key}"]`);
                if (field && !field.value) {
                    field.value = data[key];
                }
            });
        } catch (e) {
            console.warn('Could not load form data:', e);
        }
    }

    clearFormData(formId) {
        try {
            localStorage.removeItem(formId);
        } catch (e) {
            console.warn('Could not clear form data:', e);
        }
    }

    addSkipLinks() {
        const skipLinks = document.createElement('div');
        skipLinks.className = 'skip-links';
        skipLinks.innerHTML = `
            <a href="#main-content" class="button is-small is-primary skip-link">Skip to main content</a>
            <a href="#venue-search-input" class="button is-small is-info skip-link">Skip to venue search</a>
        `;
        
        // Add styles for skip links
        const style = document.createElement('style');
        style.textContent = `
            .skip-links {
                position: absolute;
                top: -100px;
                left: 0;
                z-index: 9999;
            }
            
            .skip-link:focus {
                position: absolute;
                top: 10px;
                left: 10px;
            }
        `;
        
        document.head.appendChild(style);
        document.body.insertBefore(skipLinks, document.body.firstChild);
    }

    setupFocusManagement() {
        // Enhance focus management for better keyboard navigation
        document.addEventListener('keydown', (e) => {
            // Escape key handling
            if (e.key === 'Escape') {
                // Close any open modals or dropdowns
                this.closeOpenElements();
            }
        });
    }

    setupLiveRegions() {
        // Add ARIA live regions for announcements
        const liveRegion = document.createElement('div');
        liveRegion.id = 'live-announcements';
        liveRegion.setAttribute('aria-live', 'polite');
        liveRegion.setAttribute('aria-atomic', 'true');
        liveRegion.style.position = 'absolute';
        liveRegion.style.left = '-10000px';
        liveRegion.style.width = '1px';
        liveRegion.style.height = '1px';
        liveRegion.style.overflow = 'hidden';
        
        document.body.appendChild(liveRegion);
        this.liveRegion = liveRegion;
    }

    announceContentChange(message) {
        if (this.liveRegion) {
            this.liveRegion.textContent = message;
            setTimeout(() => {
                this.liveRegion.textContent = '';
            }, 1000);
        }
    }

    announceError(message) {
        if (this.liveRegion) {
            this.liveRegion.textContent = `Error: ${message}`;
            setTimeout(() => {
                this.liveRegion.textContent = '';
            }, 3000);
        }
    }

    showErrorNotification(message) {
        const notification = document.createElement('div');
        notification.className = 'notification is-danger';
        notification.innerHTML = `
            <button class="delete"></button>
            <span class="icon"><i class="fas fa-exclamation-triangle"></i></span>
            <span>${message}</span>
        `;
        
        // Insert at top of page
        const container = document.querySelector('.container') || document.body;
        container.insertBefore(notification, container.firstChild);
        
        // Auto-remove after 5 seconds
        setTimeout(() => {
            if (notification.parentNode) {
                notification.parentNode.removeChild(notification);
            }
        }, 5000);
        
        // Handle delete button
        const deleteBtn = notification.querySelector('.delete');
        if (deleteBtn) {
            deleteBtn.addEventListener('click', () => {
                notification.parentNode.removeChild(notification);
            });
        }
        
        // Announce error
        this.announceError(message);
    }

    closeOpenElements() {
        // Close venue suggestions
        if (window.venueSearch) {
            window.venueSearch.hideSuggestions();
        }
        
        // Close map modal
        if (window.closeMapPicker) {
            window.closeMapPicker();
        }
        
        // Close any Bulma modals
        const activeModals = document.querySelectorAll('.modal.is-active');
        activeModals.forEach(modal => {
            modal.classList.remove('is-active');
        });
    }
}

// Initialize form enhancements
document.addEventListener('DOMContentLoaded', function() {
    window.formEnhancement = new FormEnhancement();
});

// Global utility functions
window.showFullEventMap = function(lat, lng, eventName) {
    // Create a full-size map modal for mobile devices
    const modal = document.createElement('div');
    modal.className = 'modal is-active';
    modal.innerHTML = `
        <div class="modal-background" onclick="this.parentElement.remove()"></div>
        <div class="modal-content">
            <div class="box">
                <h3 class="title is-4">${eventName}</h3>
                <div id="full-event-map" style="height: 400px; width: 100%;"></div>
                <div class="mt-4">
                    <button class="button" onclick="this.closest('.modal').remove()">Close</button>
                </div>
            </div>
        </div>
        <button class="modal-close is-large" onclick="this.parentElement.remove()"></button>
    `;
    
    document.body.appendChild(modal);
    
    // Initialize full map
    setTimeout(() => {
        if (window.maplibregl) {
            const fullMap = new maplibregl.Map({
                container: 'full-event-map',
                style: {
                    'version': 8,
                    'sources': {
                        'osm': {
                            'type': 'raster',
                            'tiles': ['https://tile.openstreetmap.org/{z}/{x}/{y}.png'],
                            'tileSize': 256,
                            'attribution': '© OpenStreetMap contributors'
                        }
                    },
                    'layers': [{
                        'id': 'osm',
                        'type': 'raster',
                        'source': 'osm'
                    }]
                },
                center: [lng, lat],
                zoom: 15
            });
            
            new maplibregl.Marker()
                .setLngLat([lng, lat])
                .setPopup(new maplibregl.Popup().setText(eventName))
                .addTo(fullMap);
        } else {
            // Fallback when MapLibreGL is not available
            document.getElementById('full-event-map').innerHTML = `
                <div class="map-fallback" style="height: 400px; display: flex; align-items: center; justify-content: center; background: #f5f5f5; border: 1px solid #ddd;">
                    <div class="has-text-centered">
                        <span class="icon is-large"><i class="fas fa-map-marker-alt fa-2x"></i></span><br>
                        <strong>${eventName}</strong><br>
                        <small>${lat.toFixed(4)}, ${lng.toFixed(4)}</small>
                    </div>
                </div>
            `;
        }
    }, 100);
};