/** 상품 그리드·페이지네이션 렌더링 */
import { state } from './state.js';
import { ITEMS_PER_PAGE, STATUS_META, STATUS_COLOR } from './config.js';
import { updateSummary } from './main.js';

export function renderProducts(page = 1) {
    const grid = document.getElementById('product-grid');
    const tableWrapper = document.getElementById('product-table-wrapper');
    const tableBody = document.getElementById('product-table-body');
    const summaryBar = document.getElementById('selection-summary');
    const paginationContainer = document.getElementById('pagination');

    if (!grid || !tableWrapper) return;

    // 1. 결과가 0개인 경우 (그리드/테이블 공통 안내)
    if (state.visibleProducts.length === 0) {
        grid.classList.remove('grid', 'hidden');
        grid.innerHTML = `
            <div class="flex flex-col items-center justify-center py-20 w-full text-center">
                <span class="material-symbols-outlined text-6xl text-slate-300 dark:text-slate-700 mb-4">search_off</span>
                <h3 class="text-lg font-bold text-slate-900 dark:text-white mb-2">검색 결과가 없습니다</h3>
                <p class="text-slate-500 dark:text-slate-400 text-sm">입력하신 검색어나 선택한 필터를 확인해 주세요.</p>
            </div>
        `;
        tableWrapper.classList.add('hidden');
        if (paginationContainer) paginationContainer.innerHTML = '';
        return;
    }

    // 2. 뷰 모드에 따른 컨테이너 노출 설정
    if (state.viewMode === 'grid') {
        grid.classList.remove('hidden');
        grid.classList.add('grid');
        tableWrapper.classList.add('hidden');
        summaryBar.classList.add('hidden');
    } else {
        grid.classList.add('hidden');
        tableWrapper.classList.remove('hidden');
        updateSummary();
    }

    // 3. 현재 페이지 데이터 슬라이싱
    const startIndex = (page - 1) * ITEMS_PER_PAGE;
    const pagedProducts = state.visibleProducts.slice(startIndex, startIndex + ITEMS_PER_PAGE);

    if (state.viewMode === 'grid') {
        grid.innerHTML = '';
        pagedProducts.forEach((product) => {
            const isSold = STATUS_META[product.status]?.soldOut === true;
            grid.insertAdjacentHTML('beforeend', `
                <div class="group flex flex-col gap-4 cursor-pointer" onclick="openModal('${product.id}')">
                    <div class="relative w-full aspect-[4/5] bg-slate-50 dark:bg-slate-800 rounded-xl overflow-hidden shadow-sm group-hover:shadow-md transition-shadow">
                        <div class="w-full h-full bg-center bg-no-repeat bg-cover transform ${isSold ? 'grayscale opacity-80' : 'group-hover:scale-105'} transition-transform duration-500"
                             style="background-image: url('${product.images[0]}')"></div>
                        <div class="absolute top-3 left-3">
                            <span class="px-2 py-1 text-[10px] uppercase tracking-wider font-bold rounded ${STATUS_COLOR[product.status]} backdrop-blur-md border">
                                ${product.status}
                            </span>
                        </div>
                    </div>
                    <div class="flex flex-col gap-1">
                        <h3 class="text-slate-900 dark:text-white text-base font-semibold leading-tight ${isSold ? 'line-through text-slate-400' : ''}">${product.title}</h3>
                        <p class="text-slate-500 dark:text-slate-400 text-sm font-normal line-clamp-1">${product.description}</p>
                    </div>
                </div>
            `);
        });
    } else {
        // 테이블 렌더링 (이전과 동일, 가격 포함)
        tableBody.innerHTML = pagedProducts.map(product => {
            const isSelectable = STATUS_META[product.status]?.selectable !== false;
            return `
                <tr class="hover:bg-slate-50 dark:hover:bg-slate-800/50 transition-colors cursor-pointer" onclick="if(event.target.type !== 'checkbox') openModal('${product.id}')">
                    <td class="py-4 px-4 text-center" onclick="event.stopPropagation()">
                        <input type="checkbox" class="product-check rounded border-slate-300 w-4 h-4 ${isSelectable ? 'cursor-pointer' : 'opacity-20 cursor-not-allowed'}" 
                               ${state.selectedIds.has(product.id) ? 'checked' : ''} 
                               ${isSelectable ? '' : 'disabled'}
                               onchange="window.toggleSelectItem('${product.id}')">
                    </td>
                    <td class="py-4 px-4 font-semibold text-slate-900 dark:text-white">${product.title}</td>
                    <td class="py-4 px-4 text-slate-500 text-xs">${product.category}</td>
                    <td class="py-4 px-4 text-right font-bold text-slate-900 dark:text-white">₩${product.price.toLocaleString()}</td>
                    <td class="py-4 px-4 text-center">
                        <span class="px-2 py-0.5 rounded text-[10px] font-bold border ${STATUS_COLOR[product.status]}">${product.status}</span>
                    </td>
                </tr>`;
        }).join('');
    }

    // [중요] 전체 선택 체크박스 상태 동기화
    const selectAllCheck = document.getElementById('select-all-current');
    if (selectAllCheck) {
        const startIndex = (page - 1) * ITEMS_PER_PAGE;
        const currentSelectableItems = state.visibleProducts.slice(startIndex, startIndex + ITEMS_PER_PAGE).filter((p) => STATUS_META[p.status]?.selectable !== false);

        selectAllCheck.checked = currentSelectableItems.length > 0 && currentSelectableItems.every((p) => state.selectedIds.has(p.id));
    }

    renderPagination();
}

export function renderPagination() {
    const container = document.getElementById('pagination');
    if (!container) return;
    const totalPages = Math.ceil(state.visibleProducts.length / ITEMS_PER_PAGE);
    const { currentPage } = state;

    let html = `<button onclick="changePage(${currentPage - 1})" class="size-10 flex items-center justify-center ${currentPage === 1 ? 'invisible' : ''}"><svg viewBox="0 0 24 24" fill="none"
     stroke="#64748B" stroke-width="3"
     stroke-linecap="round" stroke-linejoin="round"
     class="w-5 h-5">
  <path d="M15 18l-6-6 6-6" />
</svg>
</button>`;
    for (let i = 1; i <= totalPages; i++) {
        html += `<button onclick="changePage(${i})" class="size-10 font-bold rounded-lg ${i === currentPage ? 'bg-primary text-white' : 'text-slate-500'}">${i}</button>`;
    }
    html += `<button onclick="changePage(${currentPage + 1})" class="size-10 flex items-center justify-center ${currentPage === totalPages ? 'invisible' : ''}"><svg viewBox="0 0 24 24" fill="none"
     stroke="#64748B" stroke-width="3"
     stroke-linecap="round" stroke-linejoin="round"
     class="w-5 h-5">
  <path d="M9 18l6-6-6-6" />
</svg>
</button>`;
    container.innerHTML = html;
}

export function changePage(page) {
    state.currentPage = page;
    renderProducts(page);
    window.scrollTo({ top: 0, behavior: 'smooth' });
}

/** 모든 필터를 초기 상태로 되돌리는 함수 */
function resetAllFilters() {
    state.searchKeyword = '';
    const searchInput = document.getElementById('search-input');
    if (searchInput) searchInput.value = '';

    state.activeCategories.clear();
    state.activeCategories.add('All');

    // 상태 필터 초기화 (config에서 defaultActive인 것만)
    import('./config.js').then(({ STATUS_FILTERS }) => {
        state.activeStatuses.clear();
        STATUS_FILTERS.filter((f) => f.defaultActive).forEach((f) => state.activeStatuses.add(f.key));

        // UI 전체 갱신
        applyFilters();
        renderStatusChips();
        renderCategoryChips(productsData);
    });
}