<?php
/**
 * Functions controlling the tracker
 *
 * @package Top_Ten
 */

/**
 * Enqueues the scripts needed by Top 10.
 *
 * @since 1.9.7
 * @return void
 */
function tptn_enqueue_scripts() {
	global $post, $ajax_tptn_tracker;

	if ( ! is_object( $post ) ) {
		return;
	}

	$track_users = tptn_get_option( 'track_users' );
	$trackers    = tptn_get_option( 'trackers' );

	if ( ( is_singular() || tptn_get_option( 'tracker_all_pages' ) ) && ( 'draft' !== $post->post_status ) && ! is_customize_preview() ) {

		$current_user        = wp_get_current_user();  // Let's get the current user.
		$post_author         = ( $current_user->ID === $post->post_author ) ? true : false; // Is the current user the post author?
		$current_user_admin  = ( current_user_can( 'manage_options' ) ) ? true : false;  // Is the current user an admin?
		$current_user_editor = ( ( current_user_can( 'edit_others_posts' ) ) && ( ! current_user_can( 'manage_options' ) ) ) ? true : false;    // Is the current user an editor?

		$include_code = true;
		if ( ( $post_author ) && ( empty( $track_users['authors'] ) ) ) {
			$include_code = false;
		}
		if ( ( $current_user_admin ) && ( empty( $track_users['admins'] ) ) ) {
			$include_code = false;
		}
		if ( ( $current_user_editor ) && ( empty( $track_users['editors'] ) ) ) {
			$include_code = false;
		}
		if ( ( $current_user->exists() ) && ( ! tptn_get_option( 'logged_in' ) ) ) {
			$include_code = false;
		}

		if ( $include_code ) {

			$id               = is_singular() ? absint( $post->ID ) : 0;
			$blog_id          = get_current_blog_id();
			$activate_counter = ! empty( $trackers['overall'] ) ? 1 : 0;     // It's 1 if we're updating the overall count.
			$activate_counter = $activate_counter + ( ! empty( $trackers['daily'] ) ? 10 : 0 );  // It's 10 if we're updating the daily count.
			$top_ten_debug    = absint( tptn_get_option( 'debug_mode' ) );
			$tracker_type     = tptn_get_option( 'tracker_type' );

			switch ( $tracker_type ) {
				case 'query_based':
					$home_url = home_url( '/' );
					break;

				case 'ajaxurl':
					$home_url = admin_url( 'admin-ajax.php' );
					break;

				case 'rest_based':
					$home_url = rest_url( 'top-10/v1/tracker' );
					break;

				default:
					$home_url = rest_url( 'top-10/v1/tracker' );
					break;
			}

			/**
			 * Filter the URL of the tracker.
			 *
			 * Other tracker types can override the URL processed by the jQuery.post request
			 * The corresponding tracker can use the below variables or append their own to $ajax_tptn_tracker
			 *
			 * @since   2.0
			 */
			$home_url = apply_filters( 'tptn_add_counter_script_url', $home_url );

			// Strip any query strings since we don't need them.
			$home_url = strtok( $home_url, '?' );

			$ajax_tptn_tracker = array(
				'ajax_url'         => $home_url,
				'top_ten_id'       => $id,
				'top_ten_blog_id'  => $blog_id,
				'activate_counter' => $activate_counter,
				'top_ten_debug'    => $top_ten_debug,
				'tptn_rnd'         => wp_rand( 1, time() ),
			);

			/**
			 * Filter the localize script arguments for the Top 10 tracker.
			 *
			 * @since 2.4.0
			 */
			$ajax_tptn_tracker = apply_filters( 'tptn_tracker_script_args', $ajax_tptn_tracker );

			wp_enqueue_script( 'tptn_tracker', plugins_url( 'includes/js/top-10-tracker.min.js', TOP_TEN_PLUGIN_FILE ), array( 'jquery' ), '1.0', true );

			wp_localize_script( 'tptn_tracker', 'ajax_tptn_tracker', $ajax_tptn_tracker );

		}
	}

}
add_action( 'wp_enqueue_scripts', 'tptn_enqueue_scripts' );


/**
 * Function to add additional queries to query_vars.
 *
 * @since   2.0.0
 *
 * @param   array $vars   Query variables array.
 * @return  array Query variables array with Top 10 parameters appended
 */
function tptn_query_vars( $vars ) {
	// Add these to the list of queryvars that WP gathers.
	$vars[] = 'top_ten_id';
	$vars[] = 'top_ten_blog_id';
	$vars[] = 'activate_counter';
	$vars[] = 'view_counter';
	$vars[] = 'top_ten_debug';

	/**
	 * Function to add additional queries to query_vars.
	 *
	 * @since   2.6.0
	 *
	 * @param array $vars Updated Query variables array with Top 10 queries added.
	 */
	return apply_filters( 'tptn_query_vars', $vars );
}
add_filter( 'query_vars', 'tptn_query_vars' );


/**
 * Parses the WordPress object to update/display the count.
 *
 * @since   2.0.0
 *
 * @param   object $wp WordPress object.
 */
function tptn_parse_request( $wp ) {

	if ( empty( $wp ) ) {
		global $wp;
	}

	if ( ! isset( $wp->query_vars ) || ! is_array( $wp->query_vars ) ) {
		return;
	}

	if ( array_key_exists( 'top_ten_id', $wp->query_vars ) && empty( $wp->query_vars['top_ten_id'] ) ) {
		exit;
	}

	if ( array_key_exists( 'top_ten_id', $wp->query_vars ) && array_key_exists( 'activate_counter', $wp->query_vars ) && ! empty( $wp->query_vars['top_ten_id'] ) ) {

		$id               = absint( $wp->query_vars['top_ten_id'] );
		$blog_id          = absint( $wp->query_vars['top_ten_blog_id'] );
		$activate_counter = absint( $wp->query_vars['activate_counter'] );

		$str = tptn_update_count( $id, $blog_id, $activate_counter );

		// If the debug parameter is set then we output $str else we send a No Content header.
		if ( array_key_exists( 'top_ten_debug', $wp->query_vars ) && 1 === absint( $wp->query_vars['top_ten_debug'] ) ) {
			header( 'content-type: application/x-javascript' );
			wp_send_json( $str );
		} else {
			header( 'HTTP/1.0 204 No Content' );
			header( 'Cache-Control: max-age=15, s-maxage=0' );
		}

		// Stop anything else from loading as it is not needed.
		exit;

	} elseif ( array_key_exists( 'top_ten_id', $wp->query_vars ) && array_key_exists( 'view_counter', $wp->query_vars ) && ! empty( $wp->query_vars['top_ten_id'] ) ) {

		$id = absint( $wp->query_vars['top_ten_id'] );

		if ( $id > 0 ) {

			$output = get_tptn_post_count( $id );

			header( 'content-type: application/x-javascript' );
			echo 'document.write("' . $output . '");'; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped

			// Stop anything else from loading as it is not needed.
			exit;
		}
	} else {
		return;
	}
}
add_action( 'parse_request', 'tptn_parse_request' );


/**
 * Parse the ajax response.
 *
 * @since 2.4.0
 */
function tptn_tracker_parser() {

	$id               = isset( $_POST['top_ten_id'] ) ? absint( sanitize_text_field( wp_unslash( $_POST['top_ten_id'] ) ) ) : 0; // phpcs:ignore WordPress.Security.NonceVerification.Missing
	$blog_id          = isset( $_POST['top_ten_blog_id'] ) ? absint( sanitize_text_field( wp_unslash( $_POST['top_ten_blog_id'] ) ) ) : 0; // phpcs:ignore WordPress.Security.NonceVerification.Missing
	$activate_counter = isset( $_POST['activate_counter'] ) ? absint( sanitize_text_field( wp_unslash( $_POST['activate_counter'] ) ) ) : 0; // phpcs:ignore WordPress.Security.NonceVerification.Missing
	$top_ten_debug    = isset( $_POST['top_ten_debug'] ) ? absint( sanitize_text_field( wp_unslash( $_POST['top_ten_debug'] ) ) ) : 0; // phpcs:ignore WordPress.Security.NonceVerification.Missing

	$str = tptn_update_count( $id, $blog_id, $activate_counter );

	// If the debug parameter is set then we output $str else we send a No Content header.
	if ( 1 === $top_ten_debug ) {
		echo esc_html( $str );
	} else {
		header( 'HTTP/1.0 204 No Content' );
		header( 'Cache-Control: max-age=15, s-maxage=0' );
	}

	wp_die();
}
add_action( 'wp_ajax_nopriv_tptn_tracker', 'tptn_tracker_parser' );
add_action( 'wp_ajax_tptn_tracker', 'tptn_tracker_parser' );


/**
 * Function to update the count in the database.
 *
 * @since 2.6.0
 *
 * @param int $id Post ID.
 * @param int $blog_id Blog ID.
 * @param int $activate_counter Activate counter flag.
 *
 * @return string Response on database update.
 */
function tptn_update_count( $id, $blog_id, $activate_counter ) {

	global $wpdb;

	$table_name    = $wpdb->base_prefix . 'top_ten';
	$top_ten_daily = $wpdb->base_prefix . 'top_ten_daily';
	$str           = '';

	if ( $id > 0 ) {

		if ( ( 1 === $activate_counter ) || ( 11 === $activate_counter ) ) {

			$tt = $wpdb->query( $wpdb->prepare( "INSERT INTO {$table_name} (postnumber, cntaccess, blog_id) VALUES( %d, '1',  %d ) ON DUPLICATE KEY UPDATE cntaccess= cntaccess+1 ", $id, $blog_id ) ); // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.PreparedSQL.InterpolatedNotPrepared

			$str .= ( false === $tt ) ? 'tte' : 'tt' . $tt;
		}

		if ( ( 10 === $activate_counter ) || ( 11 === $activate_counter ) ) {

			$current_date = current_time( 'Y-m-d H' );

			$ttd = $wpdb->query( $wpdb->prepare( "INSERT INTO {$top_ten_daily} (postnumber, cntaccess, dp_date, blog_id) VALUES( %d, '1',  %s,  %d ) ON DUPLICATE KEY UPDATE cntaccess= cntaccess+1 ", $id, $current_date, $blog_id ) ); // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.PreparedSQL.InterpolatedNotPrepared

			$str .= ( false === $ttd ) ? ' ttde' : ' ttd' . $ttd;
		}
	}

	/**
	 * Filter the response on database update.
	 *
	 * @since 2.6.0
	 *
	 * @param string $str Response string.
	 * @param int $id Post ID.
	 * @param int $blog_id Blog ID.
	 * @param int $activate_counter Activate counter flag.
	 */
	return apply_filters( 'tptn_update_count', $str, $id, $blog_id, $activate_counter );
}


/**
 * Function returns the different types of trackers.
 *
 * @since 2.4.0
 * @return array Tracker types.
 */
function tptn_get_tracker_types() {

	$trackers = array(
		array(
			'id'          => 'rest_based',
			'name'        => __( 'REST API based', 'top-10' ),
			'description' => __( 'Uses the REST API to record visits', 'top-10' ),
		),
		array(
			'id'          => 'query_based',
			'name'        => __( 'Query variable based', 'top-10' ),
			'description' => __( 'Uses query variables to record visits', 'top-10' ),
		),
		array(
			'id'          => 'ajaxurl',
			'name'        => __( 'Ajaxurl based', 'top-10' ),
			'description' => __( 'Uses admin-ajax.php which is inbuilt within WordPress to process the tracker', 'top-10' ),
		),
	);

	/**
	 * Filter the array containing the types of trackers to add your own.
	 *
	 * @since 2.4.0
	 *
	 * @param string $trackers Different trackers.
	 */
	return apply_filters( 'tptn_get_tracker_types', $trackers );
}