// ========================================
// CATALOG.JS — Filter, Sort, Search, Paginate
// ========================================

const ITEMS_PER_PAGE = 12;
let currentFilters = { category: null, sizes: [], colors: [], minPrice: undefined, maxPrice: undefined, hasDiscount: false };
let currentSort = 'default';
let currentPage = 1;
let currentView = 'grid';

document.addEventListener('DOMContentLoaded', () => {
    parseURLParams();
    buildFilterUI();
    applyAndRender();
    setupEventListeners();
    setupMobileFilter();
});

function parseURLParams() {
    const params = new URLSearchParams(window.location.search);
    if (params.get('category')) currentFilters.category = params.get('category');
    if (params.get('search')) {
        const si = document.getElementById('searchInput');
        if (si) si.value = params.get('search');
    }
    if (params.get('filter') === 'discount') currentFilters.hasDiscount = true;
    if (params.get('filter') === 'new') currentSort = 'newest';
    if (params.get('sort')) currentSort = params.get('sort');

    // Update page title
    if (currentFilters.category && CATEGORIES[currentFilters.category]) {
        document.getElementById('catalogTitle').textContent = CATEGORIES[currentFilters.category].name;
        document.getElementById('catalogSubtitle').textContent = `${CATEGORIES[currentFilters.category].icon} ${CATEGORIES[currentFilters.category].name} kategoriyasidagi mahsulotlar`;
    }
}

function buildFilterUI() {
    // Categories
    const catContainer = document.getElementById('filterCategory');
    catContainer.innerHTML = `<div class="filter-option ${!currentFilters.category ? 'active' : ''}" data-cat="">
    <div class="filter-checkbox"></div><span>Barchasi</span>
  </div>`;
    Object.entries(CATEGORIES).forEach(([slug, cat]) => {
        const count = getProductsByCategory(slug).length;
        catContainer.innerHTML += `<div class="filter-option ${currentFilters.category === slug ? 'active' : ''}" data-cat="${slug}">
      <div class="filter-checkbox"></div><span>${cat.icon} ${cat.name} (${count})</span>
    </div>`;
    });
    catContainer.querySelectorAll('.filter-option').forEach(el => {
        el.addEventListener('click', () => {
            catContainer.querySelectorAll('.filter-option').forEach(e => e.classList.remove('active'));
            el.classList.add('active');
            currentFilters.category = el.dataset.cat || null;
            currentPage = 1;
            applyAndRender();
        });
    });

    // Sizes
    const sizeContainer = document.getElementById('filterSizes');
    SIZES.forEach(size => {
        const btn = document.createElement('button');
        btn.className = 'size-btn';
        btn.textContent = size;
        btn.addEventListener('click', () => {
            btn.classList.toggle('active');
            if (btn.classList.contains('active')) currentFilters.sizes.push(size);
            else currentFilters.sizes = currentFilters.sizes.filter(s => s !== size);
            currentPage = 1;
            applyAndRender();
        });
        sizeContainer.appendChild(btn);
    });

    // Colors
    const colorContainer = document.getElementById('filterColors');
    Object.entries(COLORS_MAP).forEach(([key, val]) => {
        const btn = document.createElement('button');
        btn.className = 'color-btn';
        btn.style.background = val.hex;
        btn.title = val.name;
        btn.addEventListener('click', () => {
            btn.classList.toggle('active');
            if (btn.classList.contains('active')) currentFilters.colors.push(key);
            else currentFilters.colors = currentFilters.colors.filter(c => c !== key);
            currentPage = 1;
            applyAndRender();
        });
        colorContainer.appendChild(btn);
    });

    // Discount toggle
    const discEl = document.getElementById('filterDiscount');
    if (currentFilters.hasDiscount) discEl.classList.add('active');
    discEl.addEventListener('click', () => {
        discEl.classList.toggle('active');
        currentFilters.hasDiscount = discEl.classList.contains('active');
        currentPage = 1;
        applyAndRender();
    });
}

function setupEventListeners() {
    // Sort
    document.getElementById('sortSelect').addEventListener('change', (e) => {
        currentSort = e.target.value;
        applyAndRender();
    });

    // Price filter
    document.getElementById('applyPrice').addEventListener('click', () => {
        const min = document.getElementById('priceMin').value;
        const max = document.getElementById('priceMax').value;
        currentFilters.minPrice = min ? parseInt(min) : undefined;
        currentFilters.maxPrice = max ? parseInt(max) : undefined;
        currentPage = 1;
        applyAndRender();
    });

    // Clear filters
    document.getElementById('clearFilters').addEventListener('click', clearAllFilters);

    // View toggle
    document.getElementById('gridViewBtn')?.addEventListener('click', () => { setView('grid'); });
    document.getElementById('listViewBtn')?.addEventListener('click', () => { setView('list'); });

    // Navbar search
    const si = document.getElementById('searchInput');
    if (si) {
        si.addEventListener('input', debounce(() => { currentPage = 1; applyAndRender(); }, 300));
    }
}

function setupMobileFilter() {
    const mobileBtn = document.getElementById('mobileFilterBtn');
    const sidebar = document.getElementById('filterSidebar');
    const overlay = document.getElementById('filterOverlay');

    if (window.innerWidth <= 768) mobileBtn.style.display = 'inline-flex';

    window.addEventListener('resize', () => {
        mobileBtn.style.display = window.innerWidth <= 768 ? 'inline-flex' : 'none';
    });

    mobileBtn?.addEventListener('click', () => {
        sidebar.classList.add('active');
        overlay.classList.add('active');
    });

    overlay?.addEventListener('click', () => {
        sidebar.classList.remove('active');
        overlay.classList.remove('active');
    });
}

function setView(view) {
    currentView = view;
    const grid = document.getElementById('productsGrid');
    grid.classList.toggle('list-view', view === 'list');
    document.getElementById('gridViewBtn')?.classList.toggle('active', view === 'grid');
    document.getElementById('listViewBtn')?.classList.toggle('active', view === 'list');
}

function clearAllFilters() {
    currentFilters = { category: null, sizes: [], colors: [], minPrice: undefined, maxPrice: undefined, hasDiscount: false };
    currentSort = 'default';
    currentPage = 1;
    document.getElementById('priceMin').value = '';
    document.getElementById('priceMax').value = '';
    document.getElementById('sortSelect').value = 'default';
    document.querySelectorAll('.filter-option.active, .size-btn.active, .color-btn.active').forEach(el => el.classList.remove('active'));
    document.querySelector('[data-cat=""]')?.classList.add('active');
    const si = document.getElementById('searchInput');
    if (si) si.value = '';
    applyAndRender();
}

function applyAndRender() {
    let products = [...PRODUCTS];

    // Search
    const query = document.getElementById('searchInput')?.value?.trim();
    if (query) products = searchProducts(query);

    // Filter
    products = filterProducts(products, currentFilters);

    // Sort
    products = sortProducts(products, currentSort);

    // Update count
    document.getElementById('productCount').textContent = `${products.length} ta mahsulot`;

    // Pagination
    const totalPages = Math.ceil(products.length / ITEMS_PER_PAGE);
    const start = (currentPage - 1) * ITEMS_PER_PAGE;
    const pageProducts = products.slice(start, start + ITEMS_PER_PAGE);

    // Render products
    const grid = document.getElementById('productsGrid');
    const noResults = document.getElementById('noResults');
    grid.innerHTML = '';

    if (pageProducts.length === 0) {
        grid.style.display = 'none';
        noResults.style.display = 'block';
    } else {
        grid.style.display = '';
        noResults.style.display = 'none';
        pageProducts.forEach(p => grid.appendChild(renderProductCard(p)));
    }

    renderPagination(totalPages);
}

function renderPagination(totalPages) {
    const container = document.getElementById('pagination');
    container.innerHTML = '';
    if (totalPages <= 1) return;

    for (let i = 1; i <= totalPages; i++) {
        const btn = document.createElement('button');
        btn.className = `btn btn-sm ${i === currentPage ? 'btn-primary' : 'btn-outline'}`;
        btn.textContent = i;
        btn.addEventListener('click', () => {
            currentPage = i;
            applyAndRender();
            window.scrollTo({ top: 0, behavior: 'smooth' });
        });
        container.appendChild(btn);
    }
}

function debounce(fn, ms) {
    let timer;
    return (...args) => { clearTimeout(timer); timer = setTimeout(() => fn(...args), ms); };
}