// Main JavaScript functionality for the Dify Learning Platform

document.addEventListener('DOMContentLoaded', function() {
    // Initialize tooltips
    initializeTooltips();
    
    // Initialize animations
    initializeAnimations();
    
    // Initialize progress tracking
    initializeProgressTracking();
    
    // Initialize search functionality
    initializeSearch();
});

/**
 * Initialize Bootstrap tooltips
 */
function initializeTooltips() {
    var tooltipTriggerList = [].slice.call(document.querySelectorAll('[data-bs-toggle="tooltip"]'));
    var tooltipList = tooltipTriggerList.map(function (tooltipTriggerEl) {
        return new bootstrap.Tooltip(tooltipTriggerEl);
    });
}

/**
 * Initialize scroll animations
 */
function initializeAnimations() {
    // Fade in elements on scroll
    const observerOptions = {
        threshold: 0.1,
        rootMargin: '0px 0px -50px 0px'
    };
    
    const observer = new IntersectionObserver(function(entries) {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                entry.target.classList.add('fade-in');
            }
        });
    }, observerOptions);
    
    // Observe elements for animation
    document.querySelectorAll('.tutorial-card, .project-card, .feature-item').forEach(el => {
        observer.observe(el);
    });
}

/**
 * Initialize progress tracking
 */
function initializeProgressTracking() {
    // Track page views
    trackPageView();
    
    // Track tutorial interactions
    document.querySelectorAll('.tutorial-card .btn').forEach(btn => {
        btn.addEventListener('click', function(e) {
            const tutorialTitle = this.closest('.tutorial-card').querySelector('.card-title').textContent;
            trackEvent('tutorial_started', { tutorial: tutorialTitle });
        });
    });
    
    // Track project interactions
    document.querySelectorAll('.project-card .btn').forEach(btn => {
        btn.addEventListener('click', function(e) {
            const projectTitle = this.closest('.project-card').querySelector('.card-title').textContent;
            trackEvent('project_started', { project: projectTitle });
        });
    });
}

/**
 * Initialize search functionality
 */
function initializeSearch() {
    const searchInput = document.getElementById('search-input');
    if (searchInput) {
        searchInput.addEventListener('input', debounce(handleSearch, 300));
    }
}

/**
 * Handle search functionality
 */
function handleSearch(event) {
    const query = event.target.value.toLowerCase().trim();
    const tutorials = document.querySelectorAll('.tutorial-card');
    const projects = document.querySelectorAll('.project-card');
    
    // Filter tutorials
    tutorials.forEach(card => {
        const title = card.querySelector('.card-title').textContent.toLowerCase();
        const description = card.querySelector('.card-text').textContent.toLowerCase();
        const isVisible = title.includes(query) || description.includes(query) || query === '';
        
        card.closest('.path-item, .col-md-6, .col-lg-4')?.style.setProperty('display', isVisible ? '' : 'none');
    });
    
    // Filter projects
    projects.forEach(card => {
        const title = card.querySelector('.card-title').textContent.toLowerCase();
        const description = card.querySelector('.card-text').textContent.toLowerCase();
        const isVisible = title.includes(query) || description.includes(query) || query === '';
        
        card.closest('.col-md-6, .col-lg-4')?.style.setProperty('display', isVisible ? '' : 'none');
    });
    
    // Show/hide sections based on results
    updateSearchResults(query);
}

/**
 * Update search results display
 */
function updateSearchResults(query) {
    const tutorialSection = document.querySelector('.learning-path');
    const projectSection = document.querySelector('#projects');
    
    if (query) {
        const visibleTutorials = document.querySelectorAll('.tutorial-card:not([style*="display: none"])');
        const visibleProjects = document.querySelectorAll('.project-card:not([style*="display: none"])');
        
        // Show no results message if needed
        if (visibleTutorials.length === 0 && visibleProjects.length === 0) {
            showNoResultsMessage();
        } else {
            hideNoResultsMessage();
        }
    } else {
        hideNoResultsMessage();
    }
}

/**
 * Show no results message
 */
function showNoResultsMessage() {
    let noResultsMsg = document.getElementById('no-results-message');
    if (!noResultsMsg) {
        noResultsMsg = document.createElement('div');
        noResultsMsg.id = 'no-results-message';
        noResultsMsg.className = 'alert alert-info text-center';
        noResultsMsg.innerHTML = `
            <i data-feather="search" class="me-2"></i>
            No tutorials or projects found matching your search.
        `;
        document.querySelector('.container').appendChild(noResultsMsg);
        feather.replace();
    }
    noResultsMsg.style.display = 'block';
}

/**
 * Hide no results message
 */
function hideNoResultsMessage() {
    const noResultsMsg = document.getElementById('no-results-message');
    if (noResultsMsg) {
        noResultsMsg.style.display = 'none';
    }
}

/**
 * Track page views for analytics
 */
function trackPageView() {
    const pageData = {
        page: window.location.pathname,
        title: document.title,
        timestamp: new Date().toISOString()
    };
    
    // Store in localStorage for demo purposes
    const visits = JSON.parse(localStorage.getItem('dify_visits') || '[]');
    visits.push(pageData);
    localStorage.setItem('dify_visits', JSON.stringify(visits.slice(-100))); // Keep last 100 visits
}

/**
 * Track custom events
 */
function trackEvent(eventName, eventData = {}) {
    const event = {
        name: eventName,
        data: eventData,
        timestamp: new Date().toISOString(),
        page: window.location.pathname
    };
    
    // Store in localStorage for demo purposes
    const events = JSON.parse(localStorage.getItem('dify_events') || '[]');
    events.push(event);
    localStorage.setItem('dify_events', JSON.stringify(events.slice(-100))); // Keep last 100 events
    
    console.log('Event tracked:', event);
}

/**
 * Utility function to debounce function calls
 */
function debounce(func, wait) {
    let timeout;
    return function(...args) {
        const later = () => {
            clearTimeout(timeout);
            func.apply(this, args);
        };
        clearTimeout(timeout);
        timeout = setTimeout(later, wait);
    };
}

/**
 * Smooth scroll to element
 */
function smoothScrollTo(element, offset = 80) {
    const targetPosition = element.offsetTop - offset;
    window.scrollTo({
        top: targetPosition,
        behavior: 'smooth'
    });
}

/**
 * Show loading spinner
 */
function showLoader(container) {
    const loader = document.createElement('div');
    loader.className = 'text-center py-4';
    loader.innerHTML = `
        <div class="spinner-border text-primary" role="status">
            <span class="visually-hidden">Loading...</span>
        </div>
    `;
    container.appendChild(loader);
    return loader;
}

/**
 * Hide loading spinner
 */
function hideLoader(loader) {
    if (loader && loader.parentNode) {
        loader.parentNode.removeChild(loader);
    }
}

/**
 * Show toast notification
 */
function showToast(message, type = 'info') {
    const toast = document.createElement('div');
    toast.className = `toast align-items-center text-white bg-${type} border-0`;
    toast.setAttribute('role', 'alert');
    toast.setAttribute('aria-live', 'assertive');
    toast.setAttribute('aria-atomic', 'true');
    
    toast.innerHTML = `
        <div class="d-flex">
            <div class="toast-body">
                ${message}
            </div>
            <button type="button" class="btn-close btn-close-white me-2 m-auto" data-bs-dismiss="toast"></button>
        </div>
    `;
    
    // Add to toast container or create one
    let toastContainer = document.getElementById('toast-container');
    if (!toastContainer) {
        toastContainer = document.createElement('div');
        toastContainer.id = 'toast-container';
        toastContainer.className = 'toast-container position-fixed top-0 end-0 p-3';
        toastContainer.style.zIndex = '9999';
        document.body.appendChild(toastContainer);
    }
    
    toastContainer.appendChild(toast);
    
    // Initialize and show toast
    const bsToast = new bootstrap.Toast(toast);
    bsToast.show();
    
    // Remove from DOM after hiding
    toast.addEventListener('hidden.bs.toast', () => {
        toast.remove();
    });
}

/**
 * Copy text to clipboard
 */
async function copyToClipboard(text) {
    try {
        await navigator.clipboard.writeText(text);
        showToast('Copied to clipboard!', 'success');
    } catch (err) {
        console.error('Failed to copy:', err);
        showToast('Failed to copy to clipboard', 'danger');
    }
}

/**
 * Format time duration
 */
function formatDuration(minutes) {
    if (minutes < 60) {
        return `${minutes} min`;
    } else {
        const hours = Math.floor(minutes / 60);
        const remainingMinutes = minutes % 60;
        return remainingMinutes > 0 ? `${hours}h ${remainingMinutes}m` : `${hours}h`;
    }
}

/**
 * Calculate reading time for content
 */
function calculateReadingTime(text, wordsPerMinute = 200) {
    const wordCount = text.split(/\s+/).length;
    const minutes = Math.ceil(wordCount / wordsPerMinute);
    return Math.max(1, minutes);
}

/**
 * Initialize progress bars with animation
 */
function animateProgressBar(progressBar, targetWidth) {
    let currentWidth = 0;
    const increment = targetWidth / 20;
    const interval = setInterval(() => {
        currentWidth += increment;
        if (currentWidth >= targetWidth) {
            currentWidth = targetWidth;
            clearInterval(interval);
        }
        progressBar.style.width = `${currentWidth}%`;
    }, 50);
}

// Export functions for use in other scripts
window.DifyLearning = {
    trackEvent,
    showToast,
    copyToClipboard,
    formatDuration,
    calculateReadingTime,
    smoothScrollTo,
    showLoader,
    hideLoader,
    animateProgressBar
};