<?php

/**
 * Daily task to send emails to the owners of content items
 * when the review date rolls around
 *
 * 
 * @todo create a page cache for the inherited so that we dont unneccesary need to look up parent pages
 * @package contentreview
 */
class ContentReviewEmails extends BuildTask {

	/**
	 * Holds a cached array for looking up members via their ID
	 *
	 * @var array
	 */
	protected static $member_cache = array();
	
	/**
	 * 
	 * @param SS_HTTPRequest $request
	 */
	public function run($request) {
		// Disable subsite filter (if installed)
		if (ClassInfo::exists('Subsite')) {
			$oldSubsiteState = Subsite::$disable_subsite_filter;
			Subsite::$disable_subsite_filter = true;
		}
		
		$overduePages = array();
		
		$now = class_exists('SS_Datetime') ? SS_Datetime::now()->URLDate() : SSDatetime::now()->URLDate();
		
		// First grab all the pages with a custom setting
		$pages = Page::get('Page')->where('"SiteTree"."NextReviewDate" <= \''.$now.'\'');
		
		$this->getOverduePagesForOwners($pages, $overduePages);
		
		
		// Lets send one email to one owner with all the pages in there instead of no of pages of emails
		foreach($overduePages as $memberID => $pages) {
			$this->notifyOwner($memberID, $pages);
		}
		
		// Revert subsite filter (if installed)
		if(ClassInfo::exists('Subsite')) {
			Subsite::$disable_subsite_filter = $oldSubsiteState;
		}
	}
	
	/**
	 * 
	 * @param SS_list $pages
	 * @param array &$pages
	 * @return array
	 */
	protected function getOverduePagesForOwners(SS_list $pages, array &$overduePages) {
		
		foreach($pages as $page) {
			if(!$page->canBeReviewedBy()) {
				continue;
			}
			$option = $page->getOptions();
			foreach($option->ContentReviewOwners() as $owner) {
				if(!isset(self::$member_cache[$owner->ID])) {
					self::$member_cache[$owner->ID] = $owner;
				}
				if(!isset($overduePages[$owner->ID])) {
					$overduePages[$owner->ID] = new ArrayList();
				}
				$overduePages[$owner->ID]->push($page);
			}
		}
		return $overduePages;
	}
	
	/**
	 * 
	 * @param int $owner
	 * @param array $pages
	 */
	protected function notifyOwner($ownerID, SS_List $pages) {
		$owner = self::$member_cache[$ownerID];
		$sender = Security::findAnAdministrator();
		$senderEmail = ($sender->Email) ? $sender->Email : Config::inst()->get('Email', 'admin_email');

		$subject = _t('ContentReviewEmails.SUBJECT', 'Page(s) are due for content review');
		$email = new Email();
		$email->setTo($owner->Email);
		$email->setFrom($senderEmail);
		$email->setTemplate('ContentReviewEmail');
		$email->setSubject($subject);
		$email->populateTemplate(array(
			"Recipient" => $owner,
			"Sender" => $sender,
			"Pages" => $pages
		));
		$email->send();
	}
}