<?php
	function wp_statistics_export_data() {
		GLOBAL $WP_Statistics, $wpdb; // this is how you get access to the database

		$manage_cap = wp_statistics_validate_capability( $WP_Statistics->get_option('manage_capability', 'manage_options') );

		if( current_user_can( $manage_cap ) ) {
			$table = $_POST['table-to-export'];
			$type = $_POST['export-file-type'];
			$headers = $_POST['export-headers'];
			
			// Validate the table name the user passed to us.
			if( !( $table == "useronline" || $table == "visit" || $table == "visitor" || $table == "exclusions" || $table == "pages" || $table == "search" ) ) { $table = FALSE; } 
			
			// Validate the file type the user passed to us.
			if( !( $type == "xml" || $type == "csv" || $type == "tsv" ) ) { $table = FALSE; } 
			
			if($table && $type) {
			
				require($WP_Statistics->plugin_dir . '/includes/classes/php-export-data.class.php');
				
				$file_name = WPS_EXPORT_FILE_NAME . '-' . $WP_Statistics->Current_Date('Y-m-d-H-i');
				
				switch($type) {
					case 'xml':
						$exporter = new ExportDataExcel('browser', "{$file_name}.xml");
						
						break;
					case 'csv':
						$exporter = new ExportDataCSV('browser', "{$file_name}.csv");
						
						break;
					case 'tsv':
						$exporter = new ExportDataTSV('browser', "{$file_name}.tsv");
						
						break;
				}

				$exporter->initialize();
				
				// We need to limit the number of results we retrieve to ensure we don't run out of memory
				$query_base = "SELECT * FROM {$wpdb->prefix}statistics_{$table}";
				$query = $query_base . ' LIMIT 0,1000';

				$i = 1;
				$more_results = true;
				$result = $wpdb->get_results($query, ARRAY_A);

				// If we didn't get any rows, don't output anything.
				if( count( $result ) < 1 ) { echo "No data in table!"; exit; }
				
				if( $headers ) {
					foreach( $result[0] as $key => $col ) { $columns[] = $key; }
					$exporter->addRow($columns);
				}
				
				
				while( $more_results ) {
					foreach($result as $row) {
						$exporter->addRow($row);
						
						// Make sure we've flushed the output buffer so we don't run out of memory on large exports.
						ob_flush();
						flush();
					}
					
					unset( $result );
					$wpdb->flush();
					
					$query = $query_base . ' LIMIT ' . ($i * 1000) . ',1000';
					$result = $wpdb->get_results($query, ARRAY_A);
					
					if( count( $result ) == 0 ) { $more_results = false; }
					
					$i++;
				}
				
				$exporter->finalize();
				
				exit;
			}
		}
	}
?>