// Main application state
let allProjects = [];
let filteredProjects = [];
let currentPlatformFilter = 'all';
let currentUsecaseFilter = 'all';
let currentSearchQuery = '';
let currentSort = 'name';

// Load projects data
async function loadProjects() {
    try {
        const response = await fetch('projects.json');
        allProjects = await response.json();
        filteredProjects = [...allProjects];
        renderProjects();
        updateProjectCount();
    } catch (error) {
        console.error('Error loading projects:', error);
        document.getElementById('projects-grid').innerHTML = `
            <div class="no-results">
                <h3>Error loading projects</h3>
                <p>Unable to load the projects data. Please try refreshing the page.</p>
            </div>
        `;
    }
}

// Apply all filters
function applyFilters() {
    filteredProjects = allProjects.filter(project => {
        // Platform filter
        const platformMatch = currentPlatformFilter === 'all' ||
                            project.platforms.includes(currentPlatformFilter);

        // Use case filter
        const usecaseMatch = currentUsecaseFilter === 'all' ||
                           project.usecases.includes(currentUsecaseFilter);

        // Search query
        const searchMatch = currentSearchQuery === '' ||
                          project.name.toLowerCase().includes(currentSearchQuery.toLowerCase()) ||
                          project.description.toLowerCase().includes(currentSearchQuery.toLowerCase());

        return platformMatch && usecaseMatch && searchMatch;
    });

    sortProjects();
    renderProjects();
    updateProjectCount();
}

// Sort projects
function sortProjects() {
    switch (currentSort) {
        case 'name':
            filteredProjects.sort((a, b) => a.name.localeCompare(b.name));
            break;
        case 'platform':
            filteredProjects.sort((a, b) => {
                const platformA = a.platforms[0] || '';
                const platformB = b.platforms[0] || '';
                return platformA.localeCompare(platformB);
            });
            break;
        case 'usecase':
            filteredProjects.sort((a, b) => {
                const usecaseA = a.usecases[0] || '';
                const usecaseB = b.usecases[0] || '';
                return usecaseA.localeCompare(usecaseB);
            });
            break;
    }
}

// Render projects to the grid
function renderProjects() {
    const grid = document.getElementById('projects-grid');

    if (filteredProjects.length === 0) {
        grid.innerHTML = `
            <div class="no-results">
                <h3>No projects found</h3>
                <p>Try adjusting your filters or search query.</p>
            </div>
        `;
        return;
    }

    grid.innerHTML = filteredProjects.map(project => createProjectCard(project)).join('');
}

// Create a project card HTML
function createProjectCard(project) {
    const platformTags = project.platforms
        .map(p => `<span class="meta-tag platform-tag">${formatTag(p)}</span>`)
        .join('');

    const usecaseTags = project.usecases
        .map(u => `<span class="meta-tag usecase-tag">${formatTag(u)}</span>`)
        .join('');

    const starBadge = project.github_repo
        ? `<img src="https://img.shields.io/github/stars/${project.github_repo}?style=flat-square" alt="GitHub stars" class="github-stars-badge">`
        : '';

    return `
        <div class="project-card">
            <h3>
                <a href="${project.url}" target="_blank" rel="noopener">${escapeHtml(project.name)}</a>
                ${starBadge}
            </h3>
            <p class="project-description">${escapeHtml(project.description)}</p>
            <div class="project-meta">
                ${platformTags}
                ${usecaseTags}
            </div>
        </div>
    `;
}

// Format tag names for display
function formatTag(tag) {
    return tag
        .split('-')
        .map(word => word.charAt(0).toUpperCase() + word.slice(1))
        .join(' ');
}

// Escape HTML to prevent XSS
function escapeHtml(text) {
    const div = document.createElement('div');
    div.textContent = text;
    return div.innerHTML;
}

// Update project count display
function updateProjectCount() {
    const count = document.getElementById('project-count');
    count.textContent = `(${filteredProjects.length} of ${allProjects.length})`;
}

// Set up event listeners
function setupEventListeners() {
    // Platform filter buttons
    document.querySelectorAll('#platform-filters .filter-btn').forEach(btn => {
        btn.addEventListener('click', () => {
            // Remove active class from all platform buttons
            document.querySelectorAll('#platform-filters .filter-btn').forEach(b => {
                b.classList.remove('active');
            });

            // Add active class to clicked button
            btn.classList.add('active');

            // Update filter
            currentPlatformFilter = btn.dataset.filter;
            applyFilters();
        });
    });

    // Use case filter buttons
    document.querySelectorAll('#usecase-filters .filter-btn').forEach(btn => {
        btn.addEventListener('click', () => {
            // Remove active class from all usecase buttons
            document.querySelectorAll('#usecase-filters .filter-btn').forEach(b => {
                b.classList.remove('active');
            });

            // Add active class to clicked button
            btn.classList.add('active');

            // Update filter
            currentUsecaseFilter = btn.dataset.filter;
            applyFilters();
        });
    });

    // Search input
    const searchInput = document.getElementById('search-input');
    searchInput.addEventListener('input', (e) => {
        currentSearchQuery = e.target.value;
        applyFilters();
    });

    // Sort select
    const sortSelect = document.getElementById('sort-select');
    sortSelect.addEventListener('change', (e) => {
        currentSort = e.target.value;
        sortProjects();
        renderProjects();
    });
}

// Initialize the application
document.addEventListener('DOMContentLoaded', () => {
    setupEventListeners();
    loadProjects();
});