<?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 $Id$
 * 
 * @category Piwik
 * @package Piwik
 */

/**
 * Parent class of all plugins Controllers (located in /plugins/PluginName/Controller.php
 * It defines some helper functions controllers can use.
 * 
 * @package Piwik
 */
abstract class Piwik_Controller
{
	/**
	 * Plugin name, eg. Referers
	 * @var string
	 */
	protected $pluginName;
	
	/**
	 * Date string
	 * 
	 * @var string
	 */
	protected $strDate;
	
	/**
	 * Piwik_Date object or null if the requested date is a range
	 * 
	 * @var Piwik_Date|null 
	 */
	protected $date;
	
	/**
	 * Builds the controller object, reads the date from the request, extracts plugin name from 
	 */
	function __construct()
	{
		$aPluginName = explode('_', get_class($this));
		$this->pluginName = $aPluginName[1];
		$this->strDate = Piwik_Common::getRequestVar('date', 'yesterday', 'string');
		try{
			// the date looks like YYYY-MM-DD we can build it
			$this->date = Piwik_Date::factory($this->strDate);
			$this->strDate = $this->date->toString();
		} catch(Exception $e){
			// the date looks like YYYY-MM-DD,YYYY-MM-DD or other format
			$this->date = null;
		}
	}
	
	/**
	 * Returns the name of the default method that will be called 
	 * when visiting: index.php?module=PluginName without the action parameter
	 * 
	 * @return string
	 */
	function getDefaultAction()
	{
		return 'index';
	}

	protected $standardColumnNameToTranslation = array(
		'label' => 'General_ColumnLabel',
		'nb_visits' => 'General_ColumnNbVisits',
		'nb_actions' => 'General_ColumnNbActions',
		'max_actions' => 'General_ColumnMaxActions',
		'sum_visit_length' => 'General_ColumnSumVisitLength',
		'nb_uniq_visitors' => 'General_ColumnNbUniqVisitors',
		'nb_actions_per_visit' => 'General_ColumnActionsPerVisit',
		'avg_time_on_site' => 'General_ColumnAvgTimeOnSite',
		'bounce_rate' => 'General_ColumnBounceRate',
	
		'revenue_per_visit' => 'General_ColumnValuePerVisit',
		'goals_conversion_rate' => 'General_ColumnVisitsWithConversions',
	);

	/**
	 * Given an Object implementing Piwik_iView interface, we either:
	 * - echo the output of the rendering if fetch = false
	 * - returns the output of the rendering if fetch = true
	 *
	 * @param Piwik_ViewDataTable $view
	 * @param bool $fetch
	 * @return string|void
	 */
	protected function renderView( Piwik_ViewDataTable $view, $fetch = false)
	{
		Piwik_PostEvent(	'Controller.renderView', 
							$this, 
							array(	'view' => $view,
									'controllerName' => $view->getCurrentControllerName(),
									'controllerAction' => $view->getCurrentControllerAction(),
									'apiMethodToRequestDataTable' => $view->getApiMethodToRequestDataTable(),
									'controllerActionCalledWhenRequestSubTable' => $view->getControllerActionCalledWhenRequestSubTable(),
							)
				);

		$standardColumnNameToTranslation = array_map('Piwik_Translate', $this->standardColumnNameToTranslation);
		$view->setColumnsTranslations($standardColumnNameToTranslation);
		$view->main();
		$rendered = $view->getView()->render();
		if($fetch)
		{
			return $rendered;
		}
		echo $rendered;
	}
	
	/**
	 * Returns a ViewDataTable object of an Evolution graph 
	 * for the last30 days/weeks/etc. of the current period, relative to the current date.
	 *
	 * @param string $currentModuleName
	 * @param string $currentControllerAction
	 * @param string $apiMethod
	 * @return Piwik_ViewDataTable_GenerateGraphHTML_ChartEvolution
	 */
	protected function getLastUnitGraph($currentModuleName, $currentControllerAction, $apiMethod)
	{
		$view = Piwik_ViewDataTable::factory('graphEvolution');
		$view->init( $currentModuleName, $currentControllerAction, $apiMethod );
		
		// if the date is not yet a nicely formatted date range ie. YYYY-MM-DD,YYYY-MM-DD we build it
		// otherwise the current controller action is being called with the good date format already so it's fine
		// see constructor
		if( !is_null($this->date))
		{
			$view->setParametersToModify( 
				$this->getGraphParamsModified( array('date' => $this->strDate))
				);
		}
		
		return $view;
	}

	/**
	 * Returns the array of new processed parameters once the parameters are applied.
	 * For example: if you set range=last30 and date=2008-03-10, 
	 *  the date element of the returned array will be "2008-02-10,2008-03-10"
	 * 
	 * Parameters you can set:
	 * - range: last30, previous10, etc.
	 * - date: YYYY-MM-DD, today, yesterday
	 * - period: day, week, month, year
	 * 
	 * @param array  paramsToSet = array( 'date' => 'last50', 'viewDataTable' =>'sparkline' )
	 */
	protected function getGraphParamsModified($paramsToSet = array())
	{
		if(!isset($paramsToSet['range']))
		{
			$range = 'last30';
		}
		else
		{
			$range = $paramsToSet['range'];
		}
		
		if(!isset($paramsToSet['date']))
		{
			$endDate = $this->strDate;
		}
		else
		{
			$endDate = $paramsToSet['date'];
		}
		
		if(!isset($paramsToSet['period']))
		{
			$period = Piwik_Common::getRequestVar('period');
		}
		else
		{
			$period = $paramsToSet['period'];
		}
		$last30Relative = new Piwik_Period_Range($period, $range );
		
		$last30Relative->setDefaultEndDate(Piwik_Date::factory($endDate));
		
		$paramDate = $last30Relative->getDateStart()->toString() . "," . $last30Relative->getDateEnd()->toString();
		
		$params = array_merge($paramsToSet , array(	'date' => $paramDate ) );
		
		return $params;
	}
	
	/**
	 * Returns a numeric value from the API.
	 * Works only for API methods that originally returns numeric values (there is no cast here)
	 *
	 * @param string $methodToCall, eg. Referers.getNumberOfDistinctSearchEngines
	 * @return int|float
	 */
	protected function getNumericValue( $methodToCall )
	{
		$requestString = 'method='.$methodToCall.'&format=original';
		$request = new Piwik_API_Request($requestString);
		return $request->process();
	}

	/**
	 * Returns the current URL to use in a img src=X to display a sparkline.
	 * $action must be the name of a Controller method that requests data using the Piwik_ViewDataTable::factory
	 * It will automatically build a sparkline by setting the viewDataTable=sparkline parameter in the URL.
	 * It will also computes automatically the 'date' for the 'last30' days/weeks/etc. 
	 *
	 * @param string $action, eg. method name of the controller to call in the img src
	 * @param array array of name => value of parameters to set in the generated GET url 
	 * @return string the generated URL
	 */
	protected function getUrlSparkline( $action, $customParameters = array() )
	{
		$params = $this->getGraphParamsModified( 
					array(	'viewDataTable' => 'sparkline', 
							'action' => $action,
							'module' => $this->pluginName)
					+ $customParameters
				);
		$url = Piwik_Url::getCurrentQueryStringWithParametersModified($params);
		return $url;
	}
	
	protected function setGeneralVariablesView($view)
	{
		$view->date = $this->strDate;
		
		try {
			$this->setPeriodVariablesView($view);
			$period = Piwik_Period::factory(Piwik_Common::getRequestVar('period'), Piwik_Date::factory($this->strDate));
			$view->prettyDate = $period->getLocalizedLongString();
			$idSite = Piwik_Common::getRequestVar('idSite');
			$view->idSite = $idSite;
			$site = new Piwik_Site($idSite);
			$view->siteName = $site->getName();
			$view->siteMainUrl = $site->getMainUrl();
			
			$minDate = $site->getCreationDate();
			$view->minDateYear = $minDate->toString('Y');
			$view->minDateMonth = $minDate->toString('m');
			$view->minDateDay = $minDate->toString('d');

			$maxDate = Piwik_Date::factory('today');
			$view->maxDateYear = $maxDate->toString('Y');
			$view->maxDateMonth = $maxDate->toString('m');
			$view->maxDateDay = $maxDate->toString('d');

			$view->debugTrackVisitsInsidePiwikUI = Zend_Registry::get('config')->Debug->track_visits_inside_piwik_ui;

			$view->isSuperUser = Zend_Registry::get('access')->isSuperUser();
		} catch(Exception $e) {
			self::redirectToIndex(Piwik::getModule(), Piwik::getAction());
		}
	}
	
	public static function setPeriodVariablesView($view)
	{
		if(isset($view->period))
		{
			return;
		}
		$currentPeriod = Piwik_Common::getRequestVar('period');
		$availablePeriods = array('day', 'week', 'month', 'year');
		if(!in_array($currentPeriod,$availablePeriods))
		{
			throw new Exception("Period must be one of: ".implode(",",$availablePeriods));
		}
		$periodNames = array(
			'day' => array('singular' => Piwik_Translate('CoreHome_PeriodDay'), 'plural' => Piwik_Translate('CoreHome_PeriodDays')),
			'week' => array('singular' => Piwik_Translate('CoreHome_PeriodWeek'), 'plural' => Piwik_Translate('CoreHome_PeriodWeeks')),
			'month' => array('singular' => Piwik_Translate('CoreHome_PeriodMonth'), 'plural' => Piwik_Translate('CoreHome_PeriodMonths')),
			'year' => array('singular' => Piwik_Translate('CoreHome_PeriodYear'), 'plural' => Piwik_Translate('CoreHome_PeriodYears')),
		);
		
		$found = array_search($currentPeriod,$availablePeriods);
		if($found !== false)
		{
			unset($availablePeriods[$found]);
		}
		$view->period = $currentPeriod;
		$view->otherPeriods = $availablePeriods;
		$view->periodsNames = $periodNames;
	}
	
	function redirectToIndex($moduleToRedirect, $actionToRedirect)
	{
		$sitesId = Piwik_SitesManager_API::getSitesIdWithAtLeastViewAccess();
		if(!empty($sitesId))
		{
			$firstSiteId = $sitesId[0];
			$firstSite = new Piwik_Site($firstSiteId);
			if ($firstSite->getCreationDate()->isToday()) 
			{
				$defaultDate = 'today';
			}
			else
			{
				$defaultDate = Zend_Registry::get('config')->General->default_day;
			}
			$defaultPeriod = Zend_Registry::get('config')->General->default_period;
			header("Location:index.php?module=".$moduleToRedirect."&action=".$actionToRedirect."&idSite=$firstSiteId&period=$defaultPeriod&date=$defaultDate");
		}
		else
		{
			if(Piwik::isUserIsSuperUser())
			{
				Piwik_ExitWithMessage("Error: no website were found in this Piwik installation. 
				<br>Check the table '". Piwik::prefixTable('site') ."' that should contain your Piwik websites.", false, true);
			}
			$currentLogin = Piwik::getCurrentUserLogin();
			if(!empty($currentLogin)
				&& $currentLogin != 'anonymous')
			{
				$errorMessage = sprintf(Piwik_Translate('CoreHome_NoPrivileges'),$currentLogin);
				$errorMessage .= "<br /><br />&nbsp;&nbsp;&nbsp;<b><a href='index.php?module=". Zend_Registry::get('auth')->getName() ."&amp;action=logout'>&rsaquo; ". Piwik_Translate('General_Logout'). "</a></b><br />";
				Piwik_ExitWithMessage($errorMessage, false, true);
			}
			else
			{
				Piwik_FrontController::dispatch('Login', false);
			}
		}
		exit;
	}
}