<?php

/**
 * @file pages/issue/IssueHandler.inc.php
 *
 * Copyright (c) 2014-2020 Simon Fraser University
 * Copyright (c) 2003-2020 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @class IssueHandler
 * @ingroup pages_issue
 *
 * @brief Handle requests for issue functions.
 */

import ('classes.issue.IssueAction');
import('classes.handler.Handler');

class IssueHandler extends Handler {
	/** @var IssueGalley retrieved issue galley */
	var $_galley = null;


	/**
	 * @copydoc PKPHandler::authorize()
	 */
	function authorize($request, &$args, $roleAssignments) {
		import('lib.pkp.classes.security.authorization.ContextRequiredPolicy');
		$this->addPolicy(new ContextRequiredPolicy($request));

		import('classes.security.authorization.OjsJournalMustPublishPolicy');
		$this->addPolicy(new OjsJournalMustPublishPolicy($request));

		import('classes.security.authorization.OjsIssueRequiredPolicy');
		// the 'archives' op does not need this policy so it is left out of the operations array.
		$this->addPolicy(new OjsIssueRequiredPolicy($request, $args, array('view', 'download')));

		return parent::authorize($request, $args, $roleAssignments);
	}

	/**
	 * @see PKPHandler::initialize()
	 * @param $args array Arguments list
	 */
	function initialize($request, $args = array()) {
		// Get the issue galley
		$galleyId = isset($args[1]) ? $args[1] : 0;
		if ($galleyId) {
			$issue = $this->getAuthorizedContextObject(ASSOC_TYPE_ISSUE);
			$galleyDao = DAORegistry::getDAO('IssueGalleyDAO'); /* @var $galleyDao IssueGalleyDAO */
			$journal = $request->getJournal();
			$galley = $galleyDao->getByBestId($galleyId, $issue->getId());

			// Invalid galley id, redirect to issue page
			if (!$galley) $request->redirect(null, null, 'view', $issue->getId());

			$this->setGalley($galley);
		}
	}

	/**
	 * Display about index page.
	 */
	function index($args, $request) {
		$this->current($args, $request);
	}

	/**
	 * Display current issue page.
	 */
	function current($args, $request) {
		$journal = $request->getJournal();
		$issueDao = DAORegistry::getDAO('IssueDAO'); /* @var $issueDao IssueDAO */
		$issue = $issueDao->getCurrent($journal->getId(), true);

		if ($issue != null) {
			$request->redirect(null, 'issue', 'view', $issue->getBestIssueId());
		}

		$this->setupTemplate($request);
		$templateMgr = TemplateManager::getManager($request);
		// consider public identifiers
		$pubIdPlugins = PluginRegistry::loadCategory('pubIds', true);
		$templateMgr->assign('pubIdPlugins', $pubIdPlugins);
		$templateMgr->display('frontend/pages/issue.tpl');
	}

	/**
	 * View an issue.
	 * @param $args array
	 * @param $request PKPRequest
	 */
	function view($args, $request) {
		$issue = $this->getAuthorizedContextObject(ASSOC_TYPE_ISSUE);
		$this->setupTemplate($request);
		$templateMgr = TemplateManager::getManager($request);
		$journal = $request->getJournal();

		if (($galley = $this->getGalley()) && $this->userCanViewGalley($request)) {
			if (!HookRegistry::call('IssueHandler::view::galley', array(&$request, &$issue, &$galley))) {
				$request->redirect(null, null, 'download', array($issue->getBestIssueId($journal), $galley->getBestGalleyId($journal)));
			}
		} else {
			self::_setupIssueTemplate($request, $issue, $request->getUserVar('showToc') ? true : false);
			$templateMgr->assign('issueId', $issue->getBestIssueId());

			// consider public identifiers
			$pubIdPlugins = PluginRegistry::loadCategory('pubIds', true);
			$templateMgr->assign('pubIdPlugins', $pubIdPlugins);
			$templateMgr->display('frontend/pages/issue.tpl');
		}
	}

	/**
	 * Display the issue archive listings
	 * @param $args array
	 * @param $request PKPRequest
	 */
	function archive($args, $request) {
		$this->setupTemplate($request);
		$page = isset($args[0]) ? (int) $args[0] : 1;
		$templateMgr = TemplateManager::getManager($request);
		$context = $request->getContext();

		$count = $context->getData('itemsPerPage') ? $context->getData('itemsPerPage') : Config::getVar('interface', 'items_per_page');
		$offset = $page > 1 ? ($page - 1) * $count : 0;

		$params = array(
			'contextId' => $context->getId(),
			'orderBy' => 'seq',
			'orderDirection' => 'ASC',
			'count' => $count,
			'offset' => $offset,
			'isPublished' => true,
		);
		$issues = iterator_to_array(Services::get('issue')->getMany($params));
		$total = Services::get('issue')->getMax($params);

		$showingStart = $offset + 1;
		$showingEnd = min($offset + $count, $offset + count($issues));
		$nextPage = $total > $showingEnd ? $page + 1 : null;
		$prevPage = $showingStart > 1 ? $page - 1 : null;

		$templateMgr->assign(array(
			'issues' => $issues,
			'showingStart' => $showingStart,
			'showingEnd' => $showingEnd,
			'total' => $total,
			'nextPage' => $nextPage,
			'prevPage' => $prevPage,
		));

		$templateMgr->display('frontend/pages/issueArchive.tpl');
	}

	/**
	 * Downloads an issue galley file
	 * @param $args array ($issueId, $galleyId)
	 * @param $request Request
	 */
	function download($args, $request) {
		if ($this->userCanViewGalley($request)) {
			$issue = $this->getAuthorizedContextObject(ASSOC_TYPE_ISSUE);
			$galley = $this->getGalley();

			if (!HookRegistry::call('IssueHandler::download', array(&$issue, &$galley))) {
				import('classes.file.IssueFileManager');
				$issueFileManager = new IssueFileManager($issue->getId());
				return $issueFileManager->downloadById($galley->getFileId(), $request->getUserVar('inline')?true:false);
			}
		}
	}

	/**
	 * Get the retrieved issue galley
	 * @return IssueGalley
	 */
	function getGalley() {
		return $this->_galley;
	}

	/**
	 * Set a retrieved issue galley
	 * @param $galley IssueGalley
	 */
	function setGalley($galley) {
		$this->_galley = $galley;
	}

	/**
	 * Determines whether or not a user can view an issue galley.
	 * @param $request Request
	 */
	function userCanViewGalley($request) {

		import('classes.issue.IssueAction');
		$issueAction = new IssueAction();

		$journal = $request->getJournal();
		$user = $request->getUser();
		$userId = $user ? $user->getId() : 0;
		$issue = $this->getAuthorizedContextObject(ASSOC_TYPE_ISSUE);
		$galley = $this->getGalley();

		// If this is an editorial user who can view unpublished issue galleys,
		// bypass further validation
		if ($issueAction->allowedIssuePrePublicationAccess($journal, $user)) return true;

		// Ensure reader has rights to view the issue galley
		if ($issue->getPublished()) {
			$subscriptionRequired = $issueAction->subscriptionRequired($issue, $journal);
			$isSubscribedDomain = $issueAction->subscribedDomain($request, $journal, $issue->getId());

			// Check if login is required for viewing.
			if (!$isSubscribedDomain && !Validation::isLoggedIn() && $journal->getData('restrictArticleAccess')) {
				Validation::redirectLogin();
			}

			// If no domain/ip subscription, check if user has a valid subscription
			// or if the user has previously purchased the issue
			if (!$isSubscribedDomain && $subscriptionRequired) {
				// Check if user has a valid subscription
				$subscribedUser = $issueAction->subscribedUser($user, $journal, $issue->getId());
				if (!$subscribedUser) {
					// Check if payments are enabled,
					$paymentManager = Application::getPaymentManager($journal);

					if ($paymentManager->purchaseIssueEnabled() || $paymentManager->membershipEnabled() ) {
						// If only pdf files are being restricted, then approve all non-pdf galleys
						// and continue checking if it is a pdf galley
						if ($paymentManager->onlyPdfEnabled() && !$galley->isPdfGalley()) return true;

						if (!Validation::isLoggedIn()) {
							Validation::redirectLogin("payment.loginRequired.forIssue");
						}

						// If the issue galley has been purchased, then allow reader access
						$completedPaymentDao = DAORegistry::getDAO('OJSCompletedPaymentDAO'); /* @var $completedPaymentDao OJSCompletedPaymentDAO */
						$dateEndMembership = $user->getSetting('dateEndMembership', 0);
						if ($completedPaymentDao->hasPaidPurchaseIssue($userId, $issue->getId()) || (!is_null($dateEndMembership) && $dateEndMembership > time())) {
							return true;
						} else {
							// Otherwise queue an issue purchase payment and display payment form
							$queuedPayment = $paymentManager->createQueuedPayment($request, PAYMENT_TYPE_PURCHASE_ISSUE, $userId, $issue->getId(), $journal->getData('purchaseIssueFee'));
							$paymentManager->queuePayment($queuedPayment);

							$paymentForm = $paymentManager->getPaymentForm($queuedPayment);
							$paymentForm->display($request);
							exit;
						}
					}

					if (!Validation::isLoggedIn()) {
						Validation::redirectLogin("reader.subscriptionRequiredLoginText");
					}
					$request->redirect(null, 'about', 'subscriptions');
				}
			}
		} else {
			$request->redirect(null, 'index');
		}
		return true;
	}

	function setupTemplate($request) {
		parent::setupTemplate($request);
		AppLocale::requireComponents(LOCALE_COMPONENT_PKP_READER, LOCALE_COMPONENT_APP_EDITOR);
	}

	/**
	 * Given an issue, set up the template with all the required variables for
	 * frontend/objects/issue_toc.tpl to function properly (i.e. current issue
	 * and view issue).
	 * @param $issue object The issue to display
	 * @param $showToc boolean iff false and a custom cover page exists,
	 * 	the cover page will be displayed. Otherwise table of contents
	 * 	will be displayed.
	 */
	static function _setupIssueTemplate($request, $issue, $showToc = false) {
		$journal = $request->getJournal();
		$user = $request->getUser();
		$templateMgr = TemplateManager::getManager($request);

		// Determine pre-publication access
		// FIXME: Do that. (Bug #8278)

		$templateMgr->assign(array(
			'issueIdentification' => $issue->getIssueIdentification(),
			'issueTitle' => $issue->getLocalizedTitle(),
			'issueSeries' => $issue->getIssueIdentification(array('showTitle' => false)),
		));

		$locale = AppLocale::getLocale();

		$templateMgr->assign(array(
			'locale' => $locale,
		));

		$issueGalleyDao = DAORegistry::getDAO('IssueGalleyDAO'); /* @var $issueGalleyDao IssueGalleyDAO */

		$genreDao = DAORegistry::getDAO('GenreDAO'); /* @var $genreDao GenreDAO */
		$primaryGenres = $genreDao->getPrimaryByContextId($journal->getId())->toArray();
		$primaryGenreIds = array_map(function($genre) {
			return $genre->getId();
		}, $primaryGenres);

		// Show scheduled submissions if this is a preview
		import('classes.submission.Submission'); // import STATUS_ constants
		$allowedStatuses = [STATUS_PUBLISHED];
		if (!$issue->getPublished()) {
			$allowedStatuses[] = STATUS_SCHEDULED;
		}

		$issueSubmissions = iterator_to_array(Services::get('submission')->getMany([
			'contextId' => $journal->getId(),
			'issueIds' => [$issue->getId()],
			'status' => $allowedStatuses,
			'orderBy' => 'seq',
			'orderDirection' => 'ASC',
		]));

		$sections = Application::get()->getSectionDao()->getByIssueId($issue->getId());
		$issueSubmissionsInSection = [];
		foreach ($sections as $section) {
			$issueSubmissionsInSection[$section->getId()] = [
				'title' => $section->getLocalizedTitle(),
				'articles' => [],
			];
		}
		foreach ($issueSubmissions as $submission) {
			if (!$sectionId = $submission->getCurrentPublication()->getData('sectionId')) {
				continue;
			}
			$issueSubmissionsInSection[$sectionId]['articles'][] = $submission;
		}

		$templateMgr->assign(array(
			'issue' => $issue,
			'issueGalleys' => $issueGalleyDao->getByIssueId($issue->getId()),
			'publishedSubmissions' => $issueSubmissionsInSection,
			'primaryGenreIds' => $primaryGenreIds,
		));

		// Subscription Access
		import('classes.issue.IssueAction');
		$issueAction = new IssueAction();
		$subscriptionRequired = $issueAction->subscriptionRequired($issue, $journal);
		$subscribedUser = $issueAction->subscribedUser($user, $journal);
		$subscribedDomain = $issueAction->subscribedDomain($request, $journal);

		if ($subscriptionRequired && !$subscribedUser && !$subscribedDomain) {
			$templateMgr->assign('subscriptionExpiryPartial', true);

			// Partial subscription expiry for issue
			$partial = $issueAction->subscribedUser($user, $journal, $issue->getId());
			if (!$partial) $issueAction->subscribedDomain($request, $journal, $issue->getId());
			$templateMgr->assign('issueExpiryPartial', $partial);

			// Partial subscription expiry for articles
			$articleExpiryPartial = array();
			foreach ($issueSubmissions as $issueSubmission) {
				$partial = $issueAction->subscribedUser($user, $journal, $issue->getId(), $issueSubmission->getId());
				if (!$partial) $issueAction->subscribedDomain($request, $journal, $issue->getId(), $issueSubmission->getId());
				$articleExpiryPartial[$issueSubmission->getId()] = $partial;
			}
			$templateMgr->assign('articleExpiryPartial', $articleExpiryPartial);
		}

		$completedPaymentDao = DAORegistry::getDAO('OJSCompletedPaymentDAO'); /* @var $completedPaymentDao OJSCompletedPaymentDAO */
		$templateMgr->assign(array(
			'hasAccess' => !$subscriptionRequired ||
				$issue->getAccessStatus() == ISSUE_ACCESS_OPEN ||
				$subscribedUser || $subscribedDomain ||
				($user && $completedPaymentDao->hasPaidPurchaseIssue($user->getId(), $issue->getId()))
		));

		import('classes.payment.ojs.OJSPaymentManager');
		$paymentManager = Application::getPaymentManager($journal);
		if ( $paymentManager->onlyPdfEnabled() ) {
			$templateMgr->assign('restrictOnlyPdf', true);
		}
		if ( $paymentManager->purchaseArticleEnabled() ) {
			$templateMgr->assign('purchaseArticleEnabled', true);
		}
	}
}