<?php
namespace W3TC;


class UsageStatistics_Sources {
	static public function w3tc_usage_statistics_summary_from_history( $summary, $history ) {
		// php data
		$php_memory_100kb = Util_UsageStatistics::sum( $history, 'php_memory_100kb' );
		$php_requests = Util_UsageStatistics::sum( $history, 'php_requests' );

		if ( $php_requests > 0 ) {
			if ( !isset( $summary['php'] ) ) {
				$summary['php'] = array();
			}

			$summary['php']['memory'] = Util_UsageStatistics::bytes_to_size(
				$php_memory_100kb / $php_requests * 1024 * 10.24 );

			$summary['php']['php_requests_v'] = $php_requests;
			$summary['php']['php_requests'] =
				Util_UsageStatistics::integer( $php_requests );
			$summary['php']['php_requests_per_second'] =
				Util_UsageStatistics::value_per_period_seconds( $php_requests,
				$summary );
		}

		// apc
		if ( count( $summary['apc_servers'] ) > 0 ) {
			$apc = new UsageStatistics_Sources_Apc(
				$summary['apc_servers'] );
			$summary['apc'] = $apc->get_summary();
		}

		// memcached
		if ( count( $summary['memcached_servers'] ) > 0 ) {
			$memcached = new UsageStatistics_Sources_Memcached(
				$summary['memcached_servers'] );
			$summary['memcached'] = $memcached->get_summary();
		}

		// redis
		if ( count( $summary['redis_servers'] ) > 0 ) {
			$redis = new UsageStatistics_Sources_Redis(
				$summary['redis_servers'] );
			$summary['redis'] = $redis->get_summary();
		}

		// cpu snapshot
		$c = Dispatcher::config();
		if ( $c->get_boolean( 'stats.cpu.enabled' ) ) {
			$summary['cpu'] = array(
				'avg' => round( Util_UsageStatistics::avg( $history, 'cpu' ), 2 )
			);
		}

		// access log data
		if ( $c->get_boolean( 'stats.access_log.enabled' ) ) {
			$o = new UsageStatistics_Source_AccessLog( array(
				'webserver' => $c->get_string( 'stats.access_log.webserver' ),
				'filename' => $c->get_string( 'stats.access_log.filename' ),
				'format' => $c->get_string( 'stats.access_log.format' )
			) );

			$summary = $o->w3tc_usage_statistics_summary_from_history(
				$summary, $history );
		}

		return $summary;
	}


	static public function w3tc_usage_statistics_metric_values( $metric_values ) {
		$sources = array(
			'memcached_servers' => array(),
			'redis_servers' => array(),
			'apc_servers' => array()
		);

		$sources = apply_filters( 'w3tc_usage_statistics_sources',
			$sources );

		if ( count( $sources['memcached_servers'] ) > 0 ) {
			$memcached = new UsageStatistics_Sources_Memcached(
				$sources['memcached_servers'] );
			$metric_values['memcached'] = $memcached->get_snapshot();
		}
		if ( count( $sources['apc_servers'] ) > 0 ) {
			$apc = new UsageStatistics_Sources_Apc(
				$sources['apc_servers']
			);
			$metric_values['apc'] = $apc->get_snapshot();
		}
		if ( count( $sources['redis_servers'] ) > 0 ) {
			$redis = new UsageStatistics_Sources_Redis(
				$sources['redis_servers'] );
			$metric_values['redis'] = $redis->get_snapshot();
		}

		$c = Dispatcher::config();
		if ( $c->get_boolean( 'stats.cpu.enabled' ) ) {
			// cpu snapshot
			$cpu = sys_getloadavg();
			if ( isset( $cpu[0] ) ) {
				$metric_values['cpu'] = $cpu[0];
			}
		}

		return $metric_values;
	}


	static public function w3tc_usage_statistics_history_set( $history ) {
		$c = Dispatcher::config();
		if ( $c->get_boolean( 'stats.access_log.enabled' ) ) {
			// read access log
			$o = new UsageStatistics_Source_AccessLog( array(
				'webserver' => $c->get_string( 'stats.access_log.webserver' ),
				'filename' => $c->get_string( 'stats.access_log.filename' ),
				'format' => $c->get_string( 'stats.access_log.format' )
			) );

			$history = $o->w3tc_usage_statistics_history_set( $history );
		}

		return $history;
	}
}