<?php
/**
 * Frontend Class File.
 *
 * @package TwinCart\WC\AdvancedAttributeFilters
 */

namespace TwinCart\WC\AdvancedAttributeFilters;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}


/**
 * Frontend Class.
 *
 * Handles product filtering, AJAX requests, and frontend logic.
 */
class Frontend {


	/**
	 * Instance of this class.
	 *
	 * @var Frontend|null
	 */
	protected static $instance = null;

	/**
	 * Initialize the class as a singleton.
	 *
	 * @return Frontend
	 */
	public static function init() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Constructor.
	 */
	public function __construct() {
		add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_scripts' ) );

		add_action( 'pre_get_posts', array( $this, 'sync_sorting_logic' ) );
		add_action( 'pre_get_posts', array( $this, 'filter_main_query' ) );
	}

	/**
	 * Enqueue frontend scripts and styles.
	 *
	 * @return void
	 */
	public function enqueue_scripts() {

		wp_enqueue_style(
			'twincaaf_advanced_attribute_filters_fields_css_front',
			plugins_url( 'public/css/advanced-attribute-filters.css', TWINCAAF_WC_ADVANCED_ATTRIBUTE_FILTERS_PATH ),
			array(),
			'1.0.0'
		);

		wp_enqueue_script(
			'twincaaf_advanced_attribute_filters_fields_scripts_front',
			plugins_url( 'public/js/advanced-attribute-filters.js', TWINCAAF_WC_ADVANCED_ATTRIBUTE_FILTERS_PATH ),
			array( 'jquery' ),
			'1.0.0',
			true
		);

		wp_localize_script(
			'twincaaf_advanced_attribute_filters_fields_scripts_front',
			'twincaaf_advanced_attribute_filters_fields_ajax_object',
			array(
				'ajax_url'       => admin_url( 'admin-ajax.php' ),
				'shop_url'       => get_permalink( wc_get_page_id( 'shop' ) ),
				'twincaaf_nonce' => wp_create_nonce( 'twincaaf_filter_action' ),
				'i18n'           => array(
					'show_filters' => __( 'Show Filters', 'advanced-attribute-filters' ),
					'hide_filters' => __( 'Hide Filters', 'advanced-attribute-filters' ),
				),
			)
		);
	}

	/**
	 * Build tax and meta queries from filters.
	 *
	 * @param array $filters Filter data.
	 * @return array
	 */
	private function build_filter_queries( $filters ) {
		// phpcs:disable
		$tax_query  = array();
		$meta_query = array();

		if (empty($filters) || ! is_array($filters)) {
			return array(
				// phpcs:ignore WordPress.DB.SlowDBQuery.slow_query_tax_query
				'tax_query'  => array(),
				// phpcs:ignore WordPress.DB.SlowDBQuery.slow_query_meta_query
				'meta_query' => array(),
			);
		}

		foreach ($filters as $key => $terms) {
			if (empty($terms)) {
				continue;
			}

			$clean_key = sanitize_key($key);


			if (strpos($clean_key, 'filter_') === 0) {
				$current_taxonomy = str_replace('filter_', 'pa_', $clean_key);
			} elseif ('product_cat' === $clean_key) {
				$current_taxonomy = 'product_cat';
			} else {
				continue;
			}

			if (! taxonomy_exists($current_taxonomy)) {
				continue;
			}


			$terms_array = is_array($terms) ? $terms : explode(',', $terms);
			$clean_terms = array_map('sanitize_title', $terms_array);

			if (! empty($clean_terms)) {
				$tax_query[] = array(
					'taxonomy' => $current_taxonomy,
					'field'    => 'slug',
					'terms'    => $clean_terms,
					'operator' => 'IN',
				);
			}
		}

		if (! empty($tax_query)) {
			$tax_query['relation'] = 'AND';
		}

		return array(
			// phpcs:ignore WordPress.DB.SlowDBQuery.slow_query_tax_query
			'tax_query'  => $tax_query,
			// phpcs:ignore WordPress.DB.SlowDBQuery.slow_query_meta_query
			'meta_query' => $meta_query,
		);
		// phpcs:enable
	}

	/**
	 * Filter the main query on page load based on URL parameters.
	 *
	 * @param \WP_Query $query The query object.
	 * @return void
	 */
	public function filter_main_query( $query ) {
		if ( is_admin() || ! $query->is_main_query() ) {
			return;
		}
		if ( ! is_shop() && ! is_product_taxonomy() ) {
			return;
		}

		// phpcs:disable WordPress.Security.NonceVerification.Recommended
		$filters = array();
		foreach ( $_GET as $key => $value ) {
			$clean_key = sanitize_text_field( wp_unslash( $key ) );
			if ( strpos( $clean_key, 'filter_' ) === 0 ) {
				$filters[ $clean_key ] = sanitize_text_field( wp_unslash( $value ) );
			}
		}
		// phpcs:enable

		if ( empty( $filters ) ) {
			return;
		}
		$query->set( 'woocommerce_term_action', 'none' );

		$queries = $this->build_filter_queries( $filters );
		if ( ! empty( $queries['tax_query'] ) ) {
			$query->set( 'tax_query', $queries['tax_query'] );
		}

		$query->set( 'post_status', 'publish' );
		// phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound -- Core WooCommerce filter
		$query->set( 'posts_per_page', apply_filters( 'loop_shop_per_page', 12 ) );

		add_filter( 'woocommerce_is_filtered', '__return_true' );

		add_filter(
			'the_posts',
			function ( $posts, $q ) use ( $query ) {
				if ( $q === $query ) {
					return $posts;
				}
				return $posts;
			},
			999,
			2
		);
	}

	/**
	 * Sync sorting logic for main query.
	 *
	 * @param \WP_Query $query The query object.
	 * @return void
	 */
	public function sync_sorting_logic( $query ) {
		if ( is_admin() || ! $query->is_main_query() ) {
			return;
		}

		if ( is_shop() || is_product_taxonomy() ) {
			$sorting_method = isset( $_GET['orderby'] ) ? sanitize_text_field( wp_unslash( $_GET['orderby'] ) ) : get_option( 'woocommerce_default_catalog_orderby', 'menu_order' ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended
			$ordering_args  = WC()->query->get_catalog_ordering_args( $sorting_method );

			$query->set( 'orderby', $ordering_args['orderby'] );
			$query->set( 'order', $ordering_args['order'] );

			if ( isset( $ordering_args['meta_key'] ) ) {
				$query->set( 'meta_key', $ordering_args['meta_key'] );
			}

			$current_orderby = $query->get( 'orderby' );
			if ( is_array( $current_orderby ) ) {
				$current_orderby['ID'] = 'DESC';
				$query->set( 'orderby', $current_orderby );
			} else {
				$query->set(
					'orderby',
					array(
						$current_orderby => $query->get( 'order' ),
						'ID'             => 'DESC',
					)
				);
			}
		}
	}
}