/* Linda Lindsay for Ward B School Trustee - Modern Website JavaScript */

(function() {
    'use strict';

    // DOM Content Loaded Event
    document.addEventListener('DOMContentLoaded', function() {
        initMobileNavigation();
        initSmoothScrolling();
        initFormValidation();
        initImageLazyLoading();
        initAccessibility();
        initAnalytics();
    });

    /**
     * Mobile Navigation
     */
    function initMobileNavigation() {
        const mobileToggle = document.querySelector('.mobile-nav-toggle');
        const nav = document.querySelector('.nav');
        
        if (mobileToggle && nav) {
            mobileToggle.addEventListener('click', function() {
                nav.classList.toggle('active');
                mobileToggle.setAttribute('aria-expanded', 
                    nav.classList.contains('active') ? 'true' : 'false'
                );
            });

            // Close mobile nav when clicking outside
            document.addEventListener('click', function(e) {
                if (!mobileToggle.contains(e.target) && !nav.contains(e.target)) {
                    nav.classList.remove('active');
                    mobileToggle.setAttribute('aria-expanded', 'false');
                }
            });

            // Close mobile nav on escape key
            document.addEventListener('keydown', function(e) {
                if (e.key === 'Escape' && nav.classList.contains('active')) {
                    nav.classList.remove('active');
                    mobileToggle.setAttribute('aria-expanded', 'false');
                }
            });
        }
    }

    /**
     * Smooth Scrolling for Anchor Links
     */
    function initSmoothScrolling() {
        const anchorLinks = document.querySelectorAll('a[href^="#"]');
        
        anchorLinks.forEach(link => {
            link.addEventListener('click', function(e) {
                const href = this.getAttribute('href');
                
                if (href === '#') return;
                
                const target = document.querySelector(href);
                if (target) {
                    e.preventDefault();
                    
                    const headerHeight = document.querySelector('.header')?.offsetHeight || 0;
                    const targetPosition = target.offsetTop - headerHeight - 20;
                    
                    window.scrollTo({
                        top: targetPosition,
                        behavior: 'smooth'
                    });
                }
            });
        });
    }

    /**
     * Form Validation
     */
    function initFormValidation() {
        const forms = document.querySelectorAll('form');
        
        forms.forEach(form => {
            form.addEventListener('submit', function(e) {
                if (!validateForm(this)) {
                    e.preventDefault();
                }
            });

            // Real-time validation
            const inputs = form.querySelectorAll('input, textarea, select');
            inputs.forEach(input => {
                input.addEventListener('blur', function() {
                    validateField(this);
                });
            });
        });
    }

    /**
     * Validate Form
     */
    function validateForm(form) {
        let isValid = true;
        const inputs = form.querySelectorAll('input[required], textarea[required], select[required]');
        
        inputs.forEach(input => {
            if (!validateField(input)) {
                isValid = false;
            }
        });
        
        return isValid;
    }

    /**
     * Validate Individual Field
     */
    function validateField(field) {
        const value = field.value.trim();
        const type = field.type;
        let isValid = true;
        let message = '';

        // Clear previous errors
        clearFieldError(field);

        // Required field validation
        if (field.hasAttribute('required') && !value) {
            isValid = false;
            message = 'This field is required.';
        }
        // Email validation
        else if (type === 'email' && value) {
            const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
            if (!emailRegex.test(value)) {
                isValid = false;
                message = 'Please enter a valid email address.';
            }
        }
        // Phone validation
        else if (type === 'tel' && value) {
            const phoneRegex = /^[\+]?[1-9]?[\d\s\-\(\)]{7,15}$/;
            if (!phoneRegex.test(value)) {
                isValid = false;
                message = 'Please enter a valid phone number.';
            }
        }

        if (!isValid) {
            showFieldError(field, message);
        }

        return isValid;
    }

    /**
     * Show Field Error
     */
    function showFieldError(field, message) {
        field.classList.add('error');
        
        let errorElement = field.parentNode.querySelector('.field-error');
        if (!errorElement) {
            errorElement = document.createElement('div');
            errorElement.className = 'field-error';
            errorElement.style.color = '#dc3545';
            errorElement.style.fontSize = '0.875rem';
            errorElement.style.marginTop = '0.25rem';
            field.parentNode.appendChild(errorElement);
        }
        
        errorElement.textContent = message;
    }

    /**
     * Clear Field Error
     */
    function clearFieldError(field) {
        field.classList.remove('error');
        const errorElement = field.parentNode.querySelector('.field-error');
        if (errorElement) {
            errorElement.remove();
        }
    }

    /**
     * Image Lazy Loading
     */
    function initImageLazyLoading() {
        const images = document.querySelectorAll('img[data-src]');
        
        if ('IntersectionObserver' in window) {
            const imageObserver = new IntersectionObserver((entries, observer) => {
                entries.forEach(entry => {
                    if (entry.isIntersecting) {
                        const img = entry.target;
                        img.src = img.dataset.src;
                        img.classList.remove('lazy');
                        imageObserver.unobserve(img);
                    }
                });
            });

            images.forEach(img => imageObserver.observe(img));
        } else {
            // Fallback for browsers without IntersectionObserver
            images.forEach(img => {
                img.src = img.dataset.src;
                img.classList.remove('lazy');
            });
        }
    }

    /**
     * Accessibility Enhancements
     */
    function initAccessibility() {
        // Skip to main content link
        const skipLink = document.querySelector('.skip-link');
        if (skipLink) {
            skipLink.addEventListener('click', function(e) {
                e.preventDefault();
                const main = document.querySelector('main') || document.querySelector('#main');
                if (main) {
                    main.focus();
                    main.scrollIntoView();
                }
            });
        }

        // Keyboard navigation for buttons
        const buttons = document.querySelectorAll('button, .btn');
        buttons.forEach(button => {
            button.addEventListener('keydown', function(e) {
                if (e.key === 'Enter' || e.key === ' ') {
                    e.preventDefault();
                    this.click();
                }
            });
        });

        // Focus management for modals
        document.addEventListener('keydown', function(e) {
            if (e.key === 'Tab') {
                trapFocus(e);
            }
        });
    }

    /**
     * Trap Focus for Modals
     */
    function trapFocus(e) {
        const modal = document.querySelector('.modal.active');
        if (!modal) return;

        const focusableElements = modal.querySelectorAll(
            'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])'
        );
        
        const firstElement = focusableElements[0];
        const lastElement = focusableElements[focusableElements.length - 1];

        if (e.shiftKey) {
            if (document.activeElement === firstElement) {
                lastElement.focus();
                e.preventDefault();
            }
        } else {
            if (document.activeElement === lastElement) {
                firstElement.focus();
                e.preventDefault();
            }
        }
    }

    /**
     * Analytics and Tracking
     */
    function initAnalytics() {
        // Track page views
        trackPageView();
        
        // Track button clicks
        const trackingButtons = document.querySelectorAll('[data-track]');
        trackingButtons.forEach(button => {
            button.addEventListener('click', function() {
                const action = this.dataset.track;
                trackEvent('button_click', action);
            });
        });

        // Track form submissions
        const forms = document.querySelectorAll('form');
        forms.forEach(form => {
            form.addEventListener('submit', function() {
                const formName = this.name || this.id || 'unknown_form';
                trackEvent('form_submit', formName);
            });
        });

        // Track scroll depth
        let scrollDepth = 0;
        window.addEventListener('scroll', throttle(function() {
            const currentScroll = window.scrollY + window.innerHeight;
            const totalHeight = document.documentElement.scrollHeight;
            const currentDepth = Math.round((currentScroll / totalHeight) * 100);
            
            if (currentDepth > scrollDepth && currentDepth % 25 === 0) {
                scrollDepth = currentDepth;
                trackEvent('scroll_depth', `${currentDepth}%`);
            }
        }, 1000));
    }

    /**
     * Track Page View
     */
    function trackPageView() {
        const page = window.location.pathname + window.location.search;
        trackEvent('page_view', page);
    }

    /**
     * Track Event
     */
    function trackEvent(action, label) {
        // Google Analytics 4 tracking
        if (typeof gtag !== 'undefined') {
            gtag('event', action, {
                event_label: label,
                event_category: 'website_interaction'
            });
        }
        
        // Console log for development
        if (window.location.hostname === 'localhost' || window.location.hostname === '127.0.0.1') {
            console.log('Track Event:', action, label);
        }
    }

    /**
     * Throttle Function
     */
    function throttle(func, limit) {
        let inThrottle;
        return function() {
            const args = arguments;
            const context = this;
            if (!inThrottle) {
                func.apply(context, args);
                inThrottle = true;
                setTimeout(() => inThrottle = false, limit);
            }
        };
    }

    /**
     * Debounce Function
     */
    function debounce(func, wait, immediate) {
        let timeout;
        return function() {
            const context = this;
            const args = arguments;
            const later = function() {
                timeout = null;
                if (!immediate) func.apply(context, args);
            };
            const callNow = immediate && !timeout;
            clearTimeout(timeout);
            timeout = setTimeout(later, wait);
            if (callNow) func.apply(context, args);
        };
    }

    /**
     * Utility: Get URL Parameters
     */
    function getURLParam(param) {
        const urlParams = new URLSearchParams(window.location.search);
        return urlParams.get(param);
    }

    /**
     * Utility: Format Phone Number
     */
    function formatPhoneNumber(phoneNumberString) {
        const cleaned = ('' + phoneNumberString).replace(/\D/g, '');
        const match = cleaned.match(/^(\d{3})(\d{3})(\d{4})$/);
        if (match) {
            return '(' + match[1] + ') ' + match[2] + '-' + match[3];
        }
        return null;
    }

    /**
     * Utility: Copy to Clipboard
     */
    function copyToClipboard(text) {
        if (navigator.clipboard) {
            navigator.clipboard.writeText(text).then(function() {
                showNotification('Copied to clipboard!');
            });
        } else {
            // Fallback for older browsers
            const textArea = document.createElement('textarea');
            textArea.value = text;
            document.body.appendChild(textArea);
            textArea.select();
            document.execCommand('copy');
            document.body.removeChild(textArea);
            showNotification('Copied to clipboard!');
        }
    }

    /**
     * Show Notification
     */
    function showNotification(message, type = 'success') {
        const notification = document.createElement('div');
        notification.className = `notification notification-${type}`;
        notification.textContent = message;
        notification.style.cssText = `
            position: fixed;
            top: 20px;
            right: 20px;
            background: var(--primary-green);
            color: white;
            padding: 1rem 2rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-medium);
            z-index: 10000;
            opacity: 0;
            transition: opacity 0.3s ease;
        `;
        
        document.body.appendChild(notification);
        
        setTimeout(() => {
            notification.style.opacity = '1';
        }, 10);
        
        setTimeout(() => {
            notification.style.opacity = '0';
            setTimeout(() => {
                document.body.removeChild(notification);
            }, 300);
        }, 3000);
    }

    // Export utility functions to global scope for external use
    window.LindaLindsayUtils = {
        trackEvent,
        getURLParam,
        formatPhoneNumber,
        copyToClipboard,
        showNotification
    };

})();