<?php
/**
 * Template part for displaying product category page
 *
 * @package Matreshka
 */

$current_category = get_queried_object();
$active_subcat = isset( $_GET['subcat'] ) ? intval( $_GET['subcat'] ) : 'all';

$category_product_tax_query = array(
	'relation' => 'AND',
	array(
		'taxonomy'         => 'product_cat',
		'field'            => 'term_id',
		'terms'            => array( (int) $current_category->term_id ),
		'include_children' => true,
	),
);

if ( function_exists( 'wc_get_product_visibility_term_ids' ) ) {
	$product_visibility_terms = wc_get_product_visibility_term_ids();
	$excluded_visibility_terms = array_filter(
		array(
			$product_visibility_terms['exclude-from-catalog'] ?? 0,
		)
	);

	if ( ! empty( $excluded_visibility_terms ) ) {
		$category_product_tax_query[] = array(
			'taxonomy' => 'product_visibility',
			'field'    => 'term_taxonomy_id',
			'terms'    => $excluded_visibility_terms,
			'operator' => 'NOT IN',
		);
	}
}

$category_products_query = new WP_Query(
	array(
		'post_type'              => 'product',
		'post_status'            => 'publish',
		'posts_per_page'         => -1,
		'fields'                 => 'ids',
		'orderby'                => array(
			'menu_order' => 'ASC',
			'title'      => 'ASC',
		),
		'order'                  => 'ASC',
		'no_found_rows'          => true,
		'update_post_meta_cache' => false,
		'update_post_term_cache' => true,
		'tax_query'              => $category_product_tax_query,
		'meta_query'             => array(
			array(
				'key'   => '_stock_status',
				'value' => 'instock',
			),
		),
	)
);

$all_products             = $category_products_query->posts;
$products_by_subcategory  = array();
$products_per_all_section = 20;
$products_per_page        = 50;
$paged                    = max( 1, (int) get_query_var( 'paged' ) );
$category_link            = get_term_link( $current_category );

if ( is_wp_error( $category_link ) ) {
	$category_link = get_permalink( wc_get_page_id( 'shop' ) );
}

foreach ( $all_products as $product_id ) {
	$product_cats = wp_get_post_terms( $product_id, 'product_cat' );

	$added = false;
	if ( ! empty( $product_cats ) ) {
		foreach ( $product_cats as $cat ) {
			// Group descendant terms under the direct child of the current category.
			$direct_child = null;

			if ( (int) $cat->parent === (int) $current_category->term_id ) {
				$direct_child = $cat;
			} elseif ( (int) $cat->term_id !== (int) $current_category->term_id ) {
				$ancestors = get_ancestors( $cat->term_id, 'product_cat' );

				if ( in_array( (int) $current_category->term_id, array_map( 'intval', $ancestors ), true ) ) {
					$child_term_id = (int) $cat->term_id;

					foreach ( $ancestors as $ancestor_id ) {
						$ancestor = get_term( $ancestor_id, 'product_cat' );

						if ( $ancestor && ! is_wp_error( $ancestor ) && (int) $ancestor->parent === (int) $current_category->term_id ) {
							$child_term_id = (int) $ancestor->term_id;
							break;
						}
					}

					$direct_child = get_term( $child_term_id, 'product_cat' );
				}
			}

			if ( $direct_child && ! is_wp_error( $direct_child ) ) {
				if ( ! isset( $products_by_subcategory[ $direct_child->term_id ] ) ) {
					$products_by_subcategory[ $direct_child->term_id ] = array(
						'name'     => $direct_child->name,
						'products' => array(),
					);
				}
				$products_by_subcategory[ $direct_child->term_id ]['products'][] = $product_id;
				$added = true;
				break;
			}
		}
	}

	if ( ! $added ) {
		if ( ! isset( $products_by_subcategory[0] ) ) {
			$products_by_subcategory[0] = array(
				'name'     => $current_category->name,
				'products' => array(),
			);
		}
		$products_by_subcategory[0]['products'][] = $product_id;
	}
}

// Get only direct subcategories that have visible in-stock products.
$subcategories = get_terms(
	array(
		'taxonomy'   => 'product_cat',
		'hide_empty' => true,
		'pad_counts' => true,
		'parent'     => $current_category->term_id,
	)
);

if ( is_wp_error( $subcategories ) ) {
	$subcategories = array();
}

$subcategories = array_values(
	array_filter(
		$subcategories,
		function ( $subcategory ) use ( $products_by_subcategory ) {
			return ! empty( $products_by_subcategory[ $subcategory->term_id ]['products'] );
		}
	)
);

$has_subcategory_filters = ! empty( $subcategories );

if ( $has_subcategory_filters ) {
	$ordered_products_by_subcategory = array();

	foreach ( $subcategories as $subcategory ) {
		$ordered_products_by_subcategory[ $subcategory->term_id ] = $products_by_subcategory[ $subcategory->term_id ];
	}

	if ( ! empty( $products_by_subcategory[0] ) ) {
		$ordered_products_by_subcategory[0] = $products_by_subcategory[0];
	}

	$products_by_subcategory = $ordered_products_by_subcategory;
}

if ( 'all' !== $active_subcat && empty( $products_by_subcategory[ $active_subcat ] ) ) {
	$active_subcat = 'all';
	$paged         = 1;
}

$is_all_subcategories_view = ( 'all' === $active_subcat && $has_subcategory_filters );
$is_full_grid_view         = ( 'all' !== $active_subcat || ! $has_subcategory_filters );
?>

<!-- navigation -->
<section>
	<div class="container navigation ">
		<div class="d-flex w-100">
			<a href="<?php echo esc_url( get_permalink( wc_get_page_id( 'shop' ) ) ); ?>">
				<img src="<?php echo esc_url( get_template_directory_uri() . '/assets/icons/AltArrowLeft.svg' ); ?>" alt="Back to shop">
			</a>
			<h2 class="category-title montserrat-semibold"><?php echo esc_html( $current_category->name ); ?></h2>
		</div>
	</div>
</section>

<!-- section-subcategories -->
<?php if ( $has_subcategory_filters ) : ?>
<section>
	<div class="container">
		<div class="container-subcategories">
			<a href="<?php echo esc_url( $category_link ); ?>" class="btn btn-secondary montserrat-medium subcategory-filter <?php echo ( $active_subcat === 'all' ) ? 'active' : ''; ?>" data-subcategory="all">
				Все товары
			</a>
			<?php foreach ( $subcategories as $subcategory ) : ?>
				<a href="<?php echo esc_url( add_query_arg( 'subcat', $subcategory->term_id, $category_link ) ); ?>" class="btn btn-secondary montserrat-medium subcategory-filter <?php echo ( $active_subcat == $subcategory->term_id ) ? 'active' : ''; ?>" data-subcategory="<?php echo esc_attr( $subcategory->term_id ); ?>">
					<?php echo esc_html( $subcategory->name ); ?>
				</a>
			<?php endforeach; ?>
		</div>
	</div>
</section>
<?php endif; ?>

<!-- Loading indicator -->
<div class="category-loading" style="display: none;">
	<div class="spinner-border text-primary" role="status">
		<span class="visually-hidden">Loading...</span>
	</div>
</div>

<!-- section-products -->
<?php
if ( ! empty( $products_by_subcategory ) ) :
	// Display products grouped by subcategory
	foreach ( $products_by_subcategory as $subcat_id => $subcat_data ) :
		if ( empty( $subcat_data['products'] ) ) continue;

		if ( 'all' !== $active_subcat && (int) $active_subcat !== (int) $subcat_id ) {
			continue;
		}

		$total_products       = count( $subcat_data['products'] );
		$total_pages          = $is_full_grid_view ? (int) ceil( $total_products / $products_per_page ) : 1;
		$current_page         = min( $paged, max( 1, $total_pages ) );
		$show_more_card       = $is_all_subcategories_view && $subcat_id && $total_products > $products_per_all_section;
		$all_section_limit    = $show_more_card ? max( 0, $products_per_all_section - 1 ) : $products_per_all_section;
		$display_products     = $is_full_grid_view
			? array_slice( $subcat_data['products'], ( $current_page - 1 ) * $products_per_page, $products_per_page )
			: array_slice( $subcat_data['products'], 0, $all_section_limit );
		$product_container_class = $is_full_grid_view ? 'new-products-grid' : 'product-cards container-products';
?>
<section class="subcategory-section" data-subcategory-group="<?php echo esc_attr( $subcat_id ); ?>">
	<div class="container mb-5">
		<div class="container-interesting">
			<?php if ( $is_all_subcategories_view && $subcat_id ) : ?>
				<a href="<?php echo esc_url( add_query_arg( 'subcat', $subcat_id, $category_link ) ); ?>" class="montserrat-bold subcategory-title subcategory-title-link">
					<?php echo esc_html( $subcat_data['name'] ); ?>
					<img src="<?php echo esc_url( get_template_directory_uri() . '/assets/icons/AltArrowRight.svg' ); ?>" alt="arrow right">
				</a>
			<?php else : ?>
				<h2 class="montserrat-bold subcategory-title">
					<?php echo esc_html( $subcat_data['name'] ); ?>
				</h2>
			<?php endif; ?>
			<div class="<?php echo esc_attr( $product_container_class ); ?>">
				<?php
				foreach ( $display_products as $product_id ) :
					$product = wc_get_product( $product_id );
					if ( ! $product ) continue;
					
					$product_link = get_permalink( $product_id );
					$product_image = wp_get_attachment_image_url( $product->get_image_id(), 'woocommerce_thumbnail' );
					$product_title = $product->get_name();
					$regular_price = $product->get_regular_price();
					$sale_price = $product->get_sale_price();
					
					$weight = $product->get_weight();
					$weight_text = $weight ? $weight . 'г' : '200г';

					$is_liked = matreshka_is_in_wishlist( $product_id );
					$like_icon = $is_liked ? get_template_directory_uri() . '/assets/icons/Heart.svg' : get_template_directory_uri() . '/assets/icons/like.svg';
				?>
					<div class="product-card" data-product-id="<?php echo esc_attr( $product_id ); ?>" data-product-subcategory="<?php echo esc_attr( $subcat_id ); ?>">
						<a class="link-product" href="<?php echo esc_url( $product_link ); ?>">
							<div class="product-card-img">
								<?php echo matreshka_get_product_card_image_html( $product, $product_title ); ?>
							</div>
							<p class="montserrat-medium">
								<?php echo esc_html( $product_title ); ?>
							</p>
							<span class="montserrat-medium"><?php echo esc_html( $weight_text ); ?></span>
						</a>
						<div class="product-card-bottom">
							<?php echo matreshka_get_product_price_html( $product ); ?>
							<img src="<?php echo esc_url( $like_icon ); ?>"
								 alt="like icon"
								 class="like-icon <?php echo $is_liked ? 'active' : ''; ?>">
						</div>
						<button class="btn w-100 btn-secondary montserrat-bold add-to-cart-btn" 
								data-product_id="<?php echo esc_attr( $product_id ); ?>" 
								data-product_sku="<?php echo esc_attr( $product->get_sku() ); ?>">
							В корзину
						</button>
					</div>
				<?php endforeach; ?>
				<?php if ( $show_more_card ) : ?>
					<a class="product-card subcategory-more-card" href="<?php echo esc_url( add_query_arg( 'subcat', $subcat_id, $category_link ) ); ?>" aria-label="<?php echo esc_attr( sprintf( 'Смотреть больше товаров в категории %s', $subcat_data['name'] ) ); ?>">
						<div class="subcategory-more-card__content">
							<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 -960 960 960" width="24px" fill="#969696" style="
								display: flex;
								margin: 0 auto;
								width: 60px;
								height: 60px;
								color: #cccccc;
							"><path d="m492-240 25-84q54-13 88.5-56T640-480q0-66-47-113t-113-47q-57 0-100 34.5T324-517l-84 25q5-96 74-162t166-66q100 0 170 70t70 170q0 97-66 166t-162 74ZM139-60l-79-79 171-171-151-50 400-120L360-80l-50-151L139-60Z"></path></svg>
							<div class="subcategory-more-card__title montserrat-semibold">
								<?php echo esc_html( sprintf( 'Смотреть больше товаров в категории «%s»', $subcat_data['name'] ) ); ?>
							</div>
							<span class="subcategory-more-card__button montserrat-bold">
								Смотреть больше
							</span>
						</div>
					</a>
				<?php endif; ?>
			</div>

			<?php if ( $is_full_grid_view && $total_pages > 1 ) : ?>
				<nav class="matreshka-pagination mt-5" aria-label="Page navigation">
					<ul class="pagination justify-content-center">
						<?php if ( $current_page > 1 ) : ?>
							<li class="page-item">
								<a class="page-link" href="<?php echo esc_url( 'all' !== $active_subcat ? add_query_arg( 'subcat', $active_subcat, get_pagenum_link( $current_page - 1 ) ) : get_pagenum_link( $current_page - 1 ) ); ?>" aria-label="Previous">
									<span aria-hidden="true">«</span>
								</a>
							</li>
						<?php else : ?>
							<li class="page-item disabled">
								<span class="page-link">«</span>
							</li>
						<?php endif; ?>

						<?php
						$range = 2;
						for ( $i = 1; $i <= $total_pages; $i++ ) :
							if ( 1 === $i || $total_pages === $i || ( $i >= $current_page - $range && $i <= $current_page + $range ) ) :
								$page_link = 'all' !== $active_subcat ? add_query_arg( 'subcat', $active_subcat, get_pagenum_link( $i ) ) : get_pagenum_link( $i );
								if ( $i === $current_page ) :
									?>
									<li class="page-item active" aria-current="page">
										<span class="page-link"><?php echo esc_html( $i ); ?></span>
									</li>
								<?php else : ?>
									<li class="page-item">
										<a class="page-link" href="<?php echo esc_url( $page_link ); ?>">
											<?php echo esc_html( $i ); ?>
										</a>
									</li>
								<?php endif; ?>
							<?php elseif ( $i === $current_page - $range - 1 || $i === $current_page + $range + 1 ) : ?>
								<li class="page-item disabled">
									<span class="page-link">...</span>
								</li>
							<?php endif; ?>
						<?php endfor; ?>

						<?php if ( $current_page < $total_pages ) : ?>
							<li class="page-item">
								<a class="page-link" href="<?php echo esc_url( 'all' !== $active_subcat ? add_query_arg( 'subcat', $active_subcat, get_pagenum_link( $current_page + 1 ) ) : get_pagenum_link( $current_page + 1 ) ); ?>" aria-label="Next">
									<span aria-hidden="true">»</span>
								</a>
							</li>
						<?php else : ?>
							<li class="page-item disabled">
								<span class="page-link">»</span>
							</li>
						<?php endif; ?>
					</ul>
				</nav>
			<?php endif; ?>
		</div>
	</div>
</section>
<?php
	endforeach;
else :
	?>
	<section>
		<div class="container mb-5">
			<div class="text-center py-5" style="min-height: 400px; display: flex; flex-direction: column; justify-content: center; align-items: center;">
				<h2 class="montserrat-bold" style="font-size: 2rem; margin-bottom: 1rem; color: #333;">
					Здесь пока пусто
				</h2>
				<p class="montserrat-medium" style="font-size: 1.25rem; color: #666;">
					В этой категории пока нет товаров
				</p>
			</div>
		</div>
	</section>
	<?php
	endif;
?>
<?php wp_reset_postdata(); ?>