<?php
/**
 * Piwik - Open source web analytics
 *
 * @link http://piwik.org
 * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
 * @version $Id: VisitorInterest.php 5463 2011-11-22 21:40:43Z EZdesign $
 *
 * @category Piwik_Plugins
 * @package Piwik_VisitorInterest
 */

/**
 *
 * @package Piwik_VisitorInterest
 */
class Piwik_VisitorInterest extends Piwik_Plugin
{
	public function getInformation()
	{
		$info = array(
			'description' => Piwik_Translate('VisitorInterest_PluginDescription'),
			'author' => 'Piwik',
			'author_homepage' => 'http://piwik.org/',
			'version' => Piwik_Version::VERSION,
		);
		return $info;
	}

	function getListHooksRegistered()
	{
		$hooks = array(
			'ArchiveProcessing_Day.compute' => 'archiveDay',
			'ArchiveProcessing_Period.compute' => 'archivePeriod',
			'WidgetsList.add' => 'addWidgets',
			'Menu.add' => 'addMenu',
			'API.getReportMetadata' => 'getReportMetadata',
		);
		return $hooks;
	}

	public function getReportMetadata($notification)
	{
		$reports = &$notification->getNotificationObject();
		$reports[] = array(
			'category' => Piwik_Translate('General_Visitors'),
			'name' => Piwik_Translate('VisitorInterest_WidgetLengths'),
			'module' => 'VisitorInterest',
			'action' => 'getNumberOfVisitsPerVisitDuration',
			'dimension' => Piwik_Translate('VisitorInterest_ColumnVisitDuration'),
			'metrics' => array( 'nb_visits' ),
			'processedMetrics' => false,
			'constantRowsCount' => true,
			'documentation' => Piwik_Translate('VisitorInterest_WidgetLengthsDocumentation')
					.'<br />'.Piwik_Translate('General_ChangeTagCloudView'),
			'order' => 15
		);
		
		$reports[] = array(
			'category' => Piwik_Translate('General_Visitors'),
			'name' => Piwik_Translate('VisitorInterest_WidgetPages'),
			'module' => 'VisitorInterest',
			'action' => 'getNumberOfVisitsPerPage',
			'dimension' => Piwik_Translate('VisitorInterest_ColumnPagesPerVisit'),
			'metrics' => array( 'nb_visits' ),
			'processedMetrics' => false,
			'constantRowsCount' => true,
			'documentation' => Piwik_Translate('VisitorInterest_WidgetPagesDocumentation')
					.'<br />'.Piwik_Translate('General_ChangeTagCloudView'),
			'order' => 20
		);

		$reports[] = array(
			'category' => Piwik_Translate('General_Visitors'),
			'name' => Piwik_Translate('VisitorInterest_visitsByVisitCount'),
			'module' => 'VisitorInterest',
			'action' => 'getNumberOfVisitsByVisitCount',
			'dimension' => Piwik_Translate('VisitorInterest_visitsByVisitCount'),
			'metrics' => array(
				'nb_visits',
				'nb_visits_percentage' => Piwik_Translate('General_ColumnPercentageVisits')
			),
			'processedMetrics' => false,
			'constantRowsCount' => true,
			'documentation' => Piwik_Translate('VisitorInterest_WidgetVisitsByNumDocumentation')
					.'<br />'.Piwik_Translate('General_ChangeTagCloudView'),
			'order' => 25
		);
		
		$reports[] = array(
			'category' => Piwik_Translate('General_Visitors'),
			'name' => Piwik_Translate('VisitorInterest_VisitsByDaysSinceLast'),
			'module' => 'VisitorInterest',
			'action' => 'getNumberOfVisitsByDaysSinceLast',
			'dimension' => Piwik_Translate('VisitorInterest_VisitsByDaysSinceLast'),
			'metrics' => array( 'nb_visits' ),
			'processedMetrics' => false,
			'constantRowsCount' => true,
			'documentation' => Piwik_Translate('VisitorInterest_WidgetVisitsByDaysSinceLastDocumentation'),
			'order' => 30
		);
	}

	function addWidgets()
	{
		Piwik_AddWidget( 'General_Visitors', 'VisitorInterest_WidgetLengths', 'VisitorInterest', 'getNumberOfVisitsPerVisitDuration');
		Piwik_AddWidget( 'General_Visitors', 'VisitorInterest_WidgetPages', 'VisitorInterest', 'getNumberOfVisitsPerPage');
		Piwik_AddWidget( 'General_Visitors', 'VisitorInterest_visitsByVisitCount', 'VisitorInterest', 'getNumberOfVisitsByVisitCount');
		Piwik_AddWidget( 'General_Visitors', 'VisitorInterest_VisitsByDaysSinceLast', 'VisitorInterest', 'getNumberOfVisitsByDaysSinceLast');
	}
	
	function addMenu()
	{
		Piwik_RenameMenuEntry('General_Visitors', 'VisitFrequency_SubmenuFrequency',
							  'General_Visitors', 'VisitorInterest_Engagement' );
	}

	function postLoad()
	{
		Piwik_AddAction('template_headerVisitsFrequency', array('Piwik_VisitorInterest','headerVisitsFrequency'));
		Piwik_AddAction('template_footerVisitsFrequency', array('Piwik_VisitorInterest','footerVisitsFrequency'));
	}
	
	protected static $timeGap = array(
			array(0, 0.5),
			array(0.5, 1),
			array(1, 2),
			array(2, 4),
			array(4, 6),
			array(6, 8),
			array(8, 11),
			array(11, 15),
			array(15)
		);
		
	protected static $pageGap = array(
			array(1, 1),
			array(2, 2),
			array(3, 3),
			array(4, 4),
			array(5, 5),
			array(6, 7),
			array(8, 10),
			array(11, 14),
			array(15, 20),
			array(20)
		);

	/**
	 * The set of ranges used when calculating the 'visitors who visited at least N times' report.
	 */
	protected static $visitNumberGap = array(
			array(1, 1),
			array(2, 2),
			array(3, 3),
			array(4, 4),
			array(5, 5),
			array(6, 6),
			array(7, 7),
			array(8, 8),
			array(9, 14),
			array(15, 25),
			array(26, 50),
			array(51, 100),
			array(101, 200),
			array(200)
		);
	
	/**
	 * The set of ranges used when calculating the 'days since last visit' report.
	 */
	protected static $daysSinceLastVisitGap = array(
			array(0, 0),
			array(1, 1),
			array(2, 2),
			array(3, 3),
			array(4, 4),
			array(5, 5),
			array(6, 6),
			array(7, 7),
			array(8, 14),
			array(15, 30),
			array(31, 60),
			array(61, 120),
			array(121, 364),
			array(364)
		);

	function archivePeriod( $notification )
	{
		$archiveProcessing = $notification->getNotificationObject();
		
		if(!$archiveProcessing->shouldProcessReportsForPlugin($this->getPluginName())) return;
		
		$dataTableToSum = array(
				'VisitorInterest_timeGap',
				'VisitorInterest_pageGap',
				'VisitorInterest_visitsByVisitCount',
				'VisitorInterest_daysSinceLastVisit'
		);
		$archiveProcessing->archiveDataTable($dataTableToSum);
	}
	
	public function archiveDay( $notification )
	{
		$this->archiveProcessing = $notification->getNotificationObject();

		if(!$this->archiveProcessing->shouldProcessReportsForPlugin($this->getPluginName())) return;
		
		// these prefixes are prepended to the 'SELECT as' parts of each SELECT expression. detecting
		// these prefixes allows us to get all the data in one query.
		$timeGapPrefix = 'tg';
		$pageGapPrefix = 'pg';
		$visitsByVisitNumPrefix = 'vbvn';
		$daysSinceLastVisitPrefix = 'dslv';

		// extra condition for the SQL SELECT that makes sure only returning visits are counted
		// when creating the 'days since last visit' report. the SELECT expression below it
		// is used to count all new visits.
		$daysSinceLastExtraCondition = 'and log_visit.visitor_returning = 1';
		$selectAs = $daysSinceLastVisitPrefix.'General_NewVisits';
		$newVisitCountSelect = "sum(case when log_visit.visitor_returning = 0 then 1 else 0 end) as `$selectAs`";

		// create the select expressions to use
		$timeGapSelects = Piwik_ArchiveProcessing_Day::buildReduceByRangeSelect(
			'visit_total_time', self::getSecondsGap(), 'log_visit', $timeGapPrefix);
		$pageGapSelects = Piwik_ArchiveProcessing_Day::buildReduceByRangeSelect(
			'visit_total_actions', self::$pageGap, 'log_visit', $pageGapPrefix);
		$visitsByVisitNumSelects = Piwik_ArchiveProcessing_Day::buildReduceByRangeSelect(
			'visitor_count_visits', self::$visitNumberGap, 'log_visit', $visitsByVisitNumPrefix);

		$daysSinceLastVisitSelects = Piwik_ArchiveProcessing_Day::buildReduceByRangeSelect(
			'visitor_days_since_last', self::$daysSinceLastVisitGap, 'log_visit', $daysSinceLastVisitPrefix,
			$daysSinceLastExtraCondition);
		array_unshift($daysSinceLastVisitSelects, $newVisitCountSelect);

		$selects = array_merge(
			$timeGapSelects, $pageGapSelects, $visitsByVisitNumSelects, $daysSinceLastVisitSelects);

		// select data for every report
		$row = $this->archiveProcessing->queryVisitsSimple(implode(',', $selects));
		
		// archive visits by total time report
		$recordName = 'VisitorInterest_timeGap';
		$this->archiveRangeStats($recordName, $row, Piwik_Archive::INDEX_NB_VISITS, $timeGapPrefix);
		
		// archive visits by total actions report
		$recordName = 'VisitorInterest_pageGap';
		$this->archiveRangeStats($recordName, $row, Piwik_Archive::INDEX_NB_VISITS, $pageGapPrefix);
		
		// archive visits by visit number report
		$recordName = 'VisitorInterest_visitsByVisitCount';
		$this->archiveRangeStats($recordName, $row, Piwik_Archive::INDEX_NB_VISITS, $visitsByVisitNumPrefix);
		
		// archive days since last visit report
		$recordName = 'VisitorInterest_daysSinceLastVisit';
		$this->archiveRangeStats($recordName, $row, Piwik_Archive::INDEX_NB_VISITS, $daysSinceLastVisitPrefix);
	}
	
	/**
	 * Transforms and returns the set of ranges used to calculate the 'visits by total time'
	 * report from ranges in minutes to equivalent ranges in seconds.
	 */
	protected static function getSecondsGap()
	{
		$secondsGap = array();
		foreach(self::$timeGap as $gap)
		{
			if (count($gap) == 2)
			{
				$secondsGap[] = array($gap[0] * 60, $gap[1] * 60);
			}
			else
			{
				$secondsGap[] = array($gap[0] * 60);
			}
		}
		return $secondsGap;
	}

	/**
	 * Creates and archives a DataTable from some (or all) elements of a supplied database
	 * row.
	 *
	 * @param string $recordName The record name to use when inserting the new archive.
	 * @param array $row The database row to use.
	 * @param string $selectAsPrefix The string to look for as the prefix of SELECT as 
	 *                               expressions. Elements in $row that have a SELECT as
	 *                               with this string as a prefix are used in creating
	 *                               the DataTable.'
	 */
	protected function archiveRangeStats($recordName, $row, $index, $selectAsPrefix)
	{
		// create the DataTable from parts of the result row
		$dataTable = $this->archiveProcessing->getSimpleDataTableFromRow($row, $index, $selectAsPrefix);

		// insert the data table as a blob archive
		$this->archiveProcessing->insertBlobRecord($recordName, $dataTable->getSerialized());
		destroy($dataTable);
	}
	
	static public function headerVisitsFrequency($notification)
	{
		$out =& $notification->getNotificationObject();
		$out = '<div id="leftcolumn">';
	}
	
	static public function footerVisitsFrequency($notification)
	{
		$out =& $notification->getNotificationObject();
		$out = '</div>
			<div id="rightcolumn">
			';
		$out .= Piwik_FrontController::getInstance()->fetchDispatch('VisitorInterest','index');
		$out .= '</div>';
	}
}

