<?php
/**
 * Stats
 *
 * @package Framework\Stats
 */

/**
 * Module for gathering post view statistics.
 */
class APP_Post_Statistics {

	public static $args;
	public static $stats_data;

	/**
	 * Initialize stats.
	 *
	 * @return void
	 */
	public static function init() {

		self::$args = self::get_args();
		self::$stats_data = array();

		scb_register_table( 'app_stats_daily', self::$args['table_daily'] );
		scb_register_table( 'app_stats_total', self::$args['table_total'] );

		add_action( 'appthemes_first_run', array( __CLASS__, 'install' ), 9 );
		add_action( 'delete_post', array( __CLASS__, 'delete_post_stats' ) );
		add_action( 'wp_ajax_reset-stats', array( __CLASS__, 'ajax_reset_post_stats' ) );

		// Cron
		$cronjob = new scbCron( '', array(
			'callback' => array( __CLASS__, 'clear_daily_stats' ),
			'schedule' => 'daily',
		) );
		add_action( 'appthemes_first_run', array( $cronjob, 'reset' ) );

	}


	/**
	 * Records page views for a post.
	 *
	 * @param int $post_id The post ID.
	 *
	 * @return bool Whether the stats get updated.
	 */
	public static function record_view( $post_id ) {
		global $wpdb;

		$today_date = date( 'Y-m-d', current_time( 'timestamp' ) );

		$post = get_post( $post_id );
		if ( ! $post || $post->post_author == get_current_user_id() ) {
			return false;
		}

		// first try and update the existing total post counter
		$update = $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->app_stats_total SET postcount = postcount+1 WHERE postnum = %d LIMIT 1", $post_id ) );

		// if it doesn't exist, then insert two new records
		// one in the total views, another in today's views
		if ( $update == 0 ) {
			$wpdb->insert( $wpdb->app_stats_total, array(
				'postnum' => $post_id,
				'postcount' => 1
			) );
			$wpdb->insert( $wpdb->app_stats_daily, array(
				'time' => $today_date,
				'postnum' => $post_id,
				'postcount' => 1
			) );
			// post exists so let's just update the counter
		} else {
			$update = $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->app_stats_daily SET postcount = postcount+1 WHERE time = %s AND postnum = %s LIMIT 1", $today_date, $post_id ) );

			// insert a new record since one hasn't been created for current day
			if ( $update == 0 ) {
				$wpdb->insert( $wpdb->app_stats_daily, array(
					'time' => $today_date,
					'postnum' => $post_id,
					'postcount' => 1
				) );
			}
		}

		// get all the post view info so we can update meta fields
		$sql = $wpdb->prepare( "SELECT t.postcount AS total, d.postcount AS today FROM $wpdb->app_stats_total AS t INNER JOIN $wpdb->app_stats_daily AS d ON t.postnum = d.postnum WHERE t.postnum = %d AND d.time = %s ", $post_id, $today_date );
		$stats = $wpdb->get_row( $sql );
		if ( ! $stats ) {
			return false;
		}

		// add the counters to temp values on the post so it's easy to call from the loop
		update_post_meta( $post_id, self::$args['meta_daily'], $stats->today );
		update_post_meta( $post_id, self::$args['meta_total'], $stats->total );

		return true;
	}


	/**
	 * Returns page views for a post.
	 *
	 * @param int $post_id The post ID.
	 * @param string $type (optional) Return total or daily page views.
	 *
	 * @return int Quantity of post views.
	 */
	public static function get_stats_by( $post_id, $type = 'total' ) {
		global $wpdb;

		$today_date = date( 'Y-m-d', current_time( 'timestamp' ) );

		if ( $type == 'today' ) {

			if ( isset( self::$stats_data[ $post_id ]['today'] ) ) {
				$counter = self::$stats_data[ $post_id ]['today'];
			} else {
				$counter = $wpdb->get_var( $wpdb->prepare( "SELECT postcount FROM $wpdb->app_stats_daily WHERE postnum = %d AND time = %s", $post_id, $today_date ) );
			}

		} else {

			if ( isset( self::$stats_data[ $post_id ]['total'] ) ) {
				$counter = self::$stats_data[ $post_id ]['total'];
			} else if ( get_post_meta( $post_id, self::$args['meta_total'], true ) ) {
				$counter = get_post_meta( $post_id, self::$args['meta_total'], true );
			} else {
				$counter = $wpdb->get_var( $wpdb->prepare( "SELECT postcount FROM $wpdb->app_stats_total WHERE postnum = %d", $post_id ) );
			}
		}

		if ( empty( $counter ) || ! is_numeric( $counter ) ) {
			$counter = 0;
		}

		// update cache
		self::$stats_data[ $post_id ][ $type ] = $counter;

		return $counter;
	}


	/**
	 * Installs stats tables.
	 *
	 * @return void
	 */
	public static function install() {
		// create the daily page view counter table
		$sql = "
			id mediumint(9) NOT NULL AUTO_INCREMENT,
			time date NOT NULL DEFAULT '0000-00-00',
			postnum int(11) NOT NULL,
			postcount int(11) NOT NULL DEFAULT '0',
			PRIMARY KEY  (id)";

		scb_install_table( 'app_stats_daily', $sql );


		// create the all-time page view counter table
		$sql = "
			id mediumint(9) NOT NULL AUTO_INCREMENT,
			postnum int(11) NOT NULL,
			postcount int(11) NOT NULL DEFAULT '0',
			PRIMARY KEY  (id)";

		scb_install_table( 'app_stats_total', $sql );
	}


	/**
	 * Uninstalls stats tables.
	 *
	 * @return void
	 */
	public static function uninstall() {
		scb_uninstall_table( 'app_stats_daily' );
		scb_uninstall_table( 'app_stats_total' );
	}


	/**
	 * Returns an array of args.
	 *
	 * @return array
	 */
	public static function get_args() {

		$defaults = array(
			'cache' => 'today',
			'table_daily' => 'app_stats_daily',
			'table_total' => 'app_stats_total',
			'meta_daily' => 'app_daily_count',
			'meta_total' => 'app_total_count',
		);

		list( $args ) = get_theme_support( 'app-stats' );

		$args = wp_parse_args( $args, $defaults );

		return $args;
	}


	/**
	 * Deletes daily stats older than one month.
	 *
	 * @return void
	 */
	public static function clear_daily_stats() {
		global $wpdb;

		$last_month = date( 'Y-m-d', strtotime( '-30 days', current_time( 'timestamp' ) ) );
		$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->app_stats_daily WHERE time <= '%s'", $last_month ) );
	}


	/**
	 * Deletes all stats when the admin option has been selected.
	 *
	 * @return bool Whether the stats get reseted.
	 */
	public static function reset_stats() {
		global $wpdb;

		// empty both stats tables
		$wpdb->query( "TRUNCATE $wpdb->app_stats_daily ;" );
		$wpdb->query( "TRUNCATE $wpdb->app_stats_total ;" );

		// update post meta mirrors to 0 views
		$sql = $wpdb->prepare( "UPDATE $wpdb->postmeta SET meta_value = '0' WHERE meta_key = %s OR meta_key = %s", self::$args['meta_daily'], self::$args['meta_total'] );
		$wpdb->query( $sql );

		return true;
	}


	/**
	 * Deletes post stats for given post ID.
	 *
	 * @param int $post_id Post ID.
	 * @param bool $delete_metadata (optional) Should the post metadata mirrors be deleted.
	 *
	 * @return bool Whether the stats get deleted.
	 */
	public static function delete_post_stats( $post_id, $delete_metadata = false ) {
		global $wpdb;

		if ( empty( self::$args ) || ! $post_id = absint( $post_id ) ) {
			return false;
		}

		// delete post stats from both tables
		$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->app_stats_daily WHERE postnum = '%d'", $post_id ) );
		$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->app_stats_total WHERE postnum = '%d'", $post_id ) );

		// delete post metadata mirrors
		if ( $delete_metadata ) {
			delete_post_meta( $post_id, self::$args['meta_daily'] );
			delete_post_meta( $post_id, self::$args['meta_total'] );
		}

		return true;
	}


	/**
	 * Deletes all stats for individual listing,
	 * called via ajax reset-stats action
	 *
	 * @return void
	 */
	public static function ajax_reset_post_stats() {

		if ( empty( self::$args ) || ! current_user_can( 'manage_options' ) || ! isset( $_GET['post_id'] ) ) {
			$response = array( 'success' => false );
			die( json_encode( $response ) );
		}

		$post_id = appthemes_numbers_only( $_GET['post_id'] );

		// delete post stats
		self::delete_post_stats( $post_id );

		// update post meta mirrors to 0 views
		update_post_meta( $post_id, self::$args['meta_daily'], '0' );
		update_post_meta( $post_id, self::$args['meta_total'], '0' );

		$response = array(
			'success' => true,
			'html' => html( 'span', array( 'class' => 'text' ), __( 'Stats has been reseted!', APP_TD ) ),
		);

		die( json_encode( $response ) );
	}


	/**
	 * Collects statistical data for displayed posts.
	 *
	 * @return void
	 */
	public static function collect_stats() {
		global $wpdb, $posts, $pageposts, $wp_query;

		$today_date = date( 'Y-m-d', current_time( 'timestamp' ) );

		if ( isset( $posts ) && is_array( $posts ) ) {
			foreach ( $posts as $post ) {
				$post_ids[] = $post->ID;
			}
		}

		if ( isset( $pageposts ) && is_array( $pageposts ) ) {
			foreach ( $pageposts as $post ) {
				$post_ids[] = $post->ID;
			}
		}

		if ( isset( $wp_query->posts ) && is_array( $wp_query->posts ) ) {
			foreach ( $wp_query->posts as $post ) {
				$post_ids[] = $post->ID;
			}
		}

		if ( isset( $post_ids ) && is_array( $post_ids ) ) {
			$post_ids = array_unique( $post_ids );
			$post_list = implode( ",", $post_ids );
			if ( in_array( self::$args['cache'], array( 'today', 'both' ) ) ) {
				$todays = $wpdb->get_results( $wpdb->prepare( "SELECT postcount, postnum FROM $wpdb->app_stats_daily WHERE postnum IN ($post_list) AND time = %s", $today_date ) );
			}
			if ( in_array( self::$args['cache'], array( 'total', 'both' ) ) ) {
				$totals = $wpdb->get_results( "SELECT postcount, postnum FROM $wpdb->app_stats_total WHERE postnum IN ($post_list)" );
			}
		}

		if ( isset( $todays ) && is_array( $todays ) ) {
			foreach ( $todays as $today ) {
				self::$stats_data[ $today->postnum ]['today'] = $today->postcount;
			}
		}

		if ( isset( $totals ) && is_array( $totals ) ) {
			foreach ( $totals as $total ) {
				self::$stats_data[ $total->postnum ]['total'] = $total->postcount;
			}
		}

		if ( isset( $post_ids ) && is_array( $post_ids ) ) {
			foreach ( $post_ids as $post_id ) {
				if ( in_array( self::$args['cache'], array( 'today', 'both' ) ) ) {
					if ( ! isset( self::$stats_data[ $post_id ]['today'] ) ) {
						self::$stats_data[ $post_id ]['today'] = 0;
					}
				}
				if ( in_array( self::$args['cache'], array( 'total', 'both' ) ) ) {
					if ( ! isset( self::$stats_data[ $post_id ]['total'] ) ) {
						self::$stats_data[ $post_id ]['total'] = 0;
					}
				}
			}
		}

	}

}


/**
 * Prints total and daily page views for a post.
 *
 * @param int $post_id The post ID.
 *
 * @return void
 */
function appthemes_stats_counter( $post_id ) {

	if ( ! current_theme_supports( 'app-stats' ) ) {
		return false;
	}

	$today = appthemes_get_stats_by( $post_id, 'today' );
	$total = appthemes_get_stats_by( $post_id, 'total' );

	if ( $total > 0 ) {
		printf( __( '%d total views, %d today', APP_TD ), $total, $today );
	} else {
		_e( 'No views yet', APP_TD );
	}
}


/**
 * Records page views for a post.
 *
 * @param int $post_id The post ID.
 *
 * @return bool Whether the stats get updated.
 */
function appthemes_stats_update( $post_id ) {

	if ( ! current_theme_supports( 'app-stats' ) ) {
		return false;
	}

	return APP_Post_Statistics::record_view( $post_id );
}


/**
 * Collects statistical data for displayed posts.
 *
 * @return void
 */
function appthemes_collect_stats() {

	if ( ! current_theme_supports( 'app-stats' ) ) {
		return false;
	}

	APP_Post_Statistics::collect_stats();
}


/**
 * Returns page views for a post.
 *
 * @param int $post_id The post ID.
 * @param string $type (optional) Return total or daily page views.
 *
 * @return int Quantity of post views.
 */
function appthemes_get_stats_by( $post_id, $type = 'total' ) {

	if ( ! current_theme_supports( 'app-stats' ) ) {
		return false;
	}

	return APP_Post_Statistics::get_stats_by( $post_id, $type );
}


/**
 * Deletes all stats when the admin option has been selected.
 *
 * @return bool Whether the stats get reseted.
 */
function appthemes_reset_stats() {

	if ( ! current_theme_supports( 'app-stats' ) || ! current_user_can( 'manage_options' ) ) {
		return false;
	}

	return APP_Post_Statistics::reset_stats();
}


/**
 * Prints reset listing stats link for admins. Use only in loop.
 *
 * @return void
 */
function appthemes_reset_stats_link() {
	global $post;

	if ( ! current_theme_supports( 'app-stats' ) || ! current_user_can( 'manage_options' ) || ! in_the_loop() ) {
		return;
	}

?>
	<script type="text/javascript">
	// <![CDATA[
		jQuery(document).ready(function() {
			jQuery('a.reset-stats-link').click(function(){
				jQuery.ajax({
					url: '<?php echo esc_js( admin_url( 'admin-ajax.php', 'relative' ) ); ?>',
					beforeSend: function() {
						jQuery(this).parent().fadeOut('slow');
					},
					context: this,
					dataType: "json",
					data: {
						action: 'reset-stats',
						post_id: jQuery(this).data('rel')
					},
					success: function( data ) {
						if ( data.success ) {
							jQuery(this).parent().html(data.html).fadeIn('slow');
						}
					}
				});
				return false;
			});
		});
	// ]]>
	</script>
<?php
	$link = html( 'a', array( 'class' => 'reset-stats-link', 'href' => '#', 'data-rel' => $post->ID, 'title' => __( 'Reset listing statistics', APP_TD ) ), __( 'Reset stats', APP_TD ) );
	echo html( 'p', array( 'class' => 'edit' ), $link );
}