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<?php

/**
 * MT - TEC - Redirect Day View to Single Event if there is only 1 event today
 *
 * from https://gist.github.com/cliffordp/773c00068499f59adccf76e6b63bcf22
 *
 * for https://theeventscalendar.com/support/forums/topic/default-view-daily-actual-event/
 */
function cliff_redirect_day_view_single_result_to_event() {

	if ( ! function_exists( 'tribe_is_day' ) ) {
		return false;
	}
	
	global $wp_query;

	$is_ajax = defined( 'DOING_AJAX' ) && DOING_AJAX;

	if ( 1 !== $wp_query->post_count || ! tribe_is_day() || $is_ajax ) {
		return false;
	}

	$event_id = $wp_query->posts[0];

	if ( tribe_is_event( $event_id ) ) {
		$current_date = date( 'Y-m-d', current_time( 'timestamp' ) );
		$event_date = tribe_get_start_date( $event_id, true, Tribe__Date_Utils:: DBDATEFORMAT );

		if ( $current_date === $event_date ) {
			$redirect_to = esc_url_raw( get_permalink( $event_id ) );

			// 301 is permanent. 302 is temporary.
			// https://en.wikipedia.org/wiki/List_of_HTTP_status_codes#3xx_Redirection
			// function's default is 302
			wp_redirect( $redirect_to );
			exit;
		}
	}
}
add_action( 'template_redirect', 'cliff_redirect_day_view_single_result_to_event' );