event_query.php

<?php
use VP\VisitPlacer\Helpers;
class Event_Query {
	public $query;

	public function __construct() {
    	$this->query = $GLOBALS['wp_query'];
    }

	function get_query_ids() {
		$category = get_query_var( 'event-category' );
		$filter = get_query_var( 'event_filter' );
		$location = get_query_var( 'location' );
		$cost = get_query_var( 'cost' );
		$start_date = get_query_var( 'start_date' );
		$end_date = get_query_var( 'end_date' );


		$args = array(
			'post_type' => 'event',
			'posts_per_page' => 100000,
			'suppress_filters' => false,
			'no_found_rows' => true,
			'update_post_meta_cache' => false,
			'fields' => 'ids',
		);

		if( $start_date && $end_date ) {
			$dates = array(
				'event_start_after'=> $start_date,
				'event_end_before' => $end_date,
			);
			$args = array_merge( $args, $dates );
		}

		if ( $category || $filter ||  $location || $cost ) {
			$taxes = array(
				'event-category' => esc_attr( $category ),
				'event_filter' => Helpers\term_whitelist( 'event_filter', $filter ),
				'location' => esc_attr( $location ),
				'cost' => esc_attr( $cost ),
			);
			$tax_output = array();

			foreach( $taxes as $key => $value ) {
				if ( !empty( $value ) ) {
					$tax_output[] = array(
				        'taxonomy' => $key,
				        'field' => 'slug',
				        'terms' => $value,
				    );
				}
			}

			$tax_query = array(
				'tax_query' => array(
				'relation' => 'AND',
					$tax_output,
				)
			);
			$args = array_merge( $args, $tax_query );
		}

		$query = new \WP_Query( $args );

		return $query->posts;
	}

	function count_results() {
		return count( $this->get_query_ids() );
	}

	function get_term_ids( $taxonomy ) {
		$post_ids = $this->get_query_ids();
		$terms_array = array();
		foreach( $post_ids as $post_id ) {
			$term_ids = wp_get_post_terms( $post_id, $taxonomy, array( 'fields' => 'ids' ) );
			foreach( $term_ids as $id ) {
				$terms_array[] = $id;
			}
		}
		return array_unique( $terms_array );
	}

	function count_taxonomy_posts( $taxonomy_term, $taxonomy ) {
		$post_ids = $this->get_query_ids();
		$args = array(
			'post_type' => 'event',
			'posts_per_page' => 1000,
			 'tax_query' => array(
				 array(
					'taxonomy' => $taxonomy,
					'field'    => 'term_id',
					'terms'    => $taxonomy_term->term_id,
				),
			 ),
			 'fields' => 'ids',
		);
		$tax_posts = get_posts( $args );
		$intersect = array_intersect( $tax_posts, $post_ids );

		return sprintf( '(%d)', count( $intersect ) );
	}

	function filtered_events() {
		$post_ids = $this->get_query_ids();
		foreach( $post_ids as $id ) :
			$event = get_post( $id ); global $post; $post = $event; setup_postdata( $post );
			get_template_part( 'partials/event', 'list' );
		endforeach; wp_reset_postdata();
	}

}