<?php

namespace XF\Pub\Controller;

use XF\Mvc\FormAction;
use XF\Mvc\ParameterBag;
use XF\Mvc\Reply\AbstractReply;

class Thread extends AbstractController
{
	public function actionIndex(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id, $this->getThreadViewExtraWith());

		if ($thread->discussion_type == 'redirect')
		{
			if (!$thread->Redirect)
			{
				return $this->noPermission();
			}

			return $this->redirectPermanently($this->request->convertToAbsoluteUri($thread->Redirect->target_url));
		}

		$threadRepo = $this->getThreadRepo();

		$page = $params->page;
		$perPage = $this->options()->messagesPerPage;

		$this->assertValidPage($page, $perPage, $thread->reply_count + 1, 'threads', $thread);
		$this->assertCanonicalUrl($this->buildLink('threads', $thread, ['page' => $page]));

		$postRepo = $this->getPostRepo();

		$postList = $postRepo->findPostsForThreadView($thread)->onPage($page, $perPage);
		$posts = $postList->fetch();

		/** @var \XF\Repository\Attachment $attachmentRepo */
		$attachmentRepo = $this->repository('XF:Attachment');
		$attachmentRepo->addAttachmentsToContent($posts, 'post');

		$lastPost = $posts->last();
		if (!$lastPost)
		{
			if ($page > 1)
			{
				return $this->redirect($this->buildLink('threads', $thread));
			}
			else
			{
				// should never really happen
				return $this->error(\XF::phrase('something_went_wrong_please_try_again'));
			}
		}

		$firstPost = $posts->first();

		/** @var \XF\Entity\Post $post */

		$canInlineMod = false;
		foreach ($posts AS $post)
		{
			if ($post->canUseInlineModeration())
			{
				$canInlineMod = true;
				break;
			}
		}

		$firstUnread = null;
		foreach ($posts AS $post)
		{
			if ($post->isUnread())
			{
				$firstUnread = $post;
				break;
			}
		}

		$poll = ($thread->discussion_type == 'poll' ? $thread->Poll : null);

		$threadRepo->markThreadReadByVisitor($thread, $lastPost->post_date);
		$threadRepo->logThreadView($thread);

		$viewParams = [
			'thread' => $thread,
			'forum' => $thread->Forum,
			'posts' => $posts,
			'firstPost' => $firstPost,
			'lastPost' => $lastPost,
			'firstUnread' => $firstUnread,

			'poll' => $poll,

			'canInlineMod' => $canInlineMod,

			'page' => $page,
			'perPage' => $perPage,

			'attachmentData' => $this->getReplyAttachmentData($thread),

			'pendingApproval' => $this->filter('pending_approval', 'bool')
		];
		return $this->view('XF:Thread\View', 'thread_view', $viewParams);
	}

	protected function getThreadViewExtraWith()
	{
		$extraWith = ['User'];
		$userId = \XF::visitor()->user_id;
		if ($userId)
		{
			$extraWith[] = 'Watch|' . $userId;
			$extraWith[] = 'DraftReplies|' . $userId;
			$extraWith[] = 'ReplyBans|' . $userId;
		}

		return $extraWith;
	}

	public function actionUnread(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id, ['LastPost']);

		if (!\XF::visitor()->user_id)
		{
			return $this->redirect($this->buildLink('threads', $thread));
		}

		$postRepo = $this->getPostRepo();
		$firstUnreadDate = $thread->getVisitorReadDate();

		// this would force us to go to a new post, even if we have no read marking data for this thread
		$forceNew = $this->filter('new', 'bool');

		if (!$forceNew && $firstUnreadDate <= $this->getThreadRepo()->getReadMarkingCutOff())
		{
			// We have no read marking data for this person, so we don't know whether they've read this thread before.
			// More than likely, they haven't so we have to take them to the beginning.
			return $this->redirect($this->buildLink('threads', $thread));
		}

		$findFirstUnread = $postRepo->findNextPostsInThread($thread, $firstUnreadDate);
		$firstUnread = $findFirstUnread->skipIgnored()->fetchOne();

		if (!$firstUnread)
		{
			$firstUnread = $thread->LastPost;
		}

		if (!$firstUnread)
		{
			// sanity check, probably shouldn't happen
			return $this->redirect($this->buildLink('threads', $thread));
		}

		if ($firstUnread->post_id == $thread->first_post_id)
		{
			return $this->redirect($this->buildLink('threads', $thread));
		}

		return $this->redirect($this->plugin('XF:Thread')->getPostLink($firstUnread));
	}

	public function actionLatest(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id, ['LastPost']);
		$post = $thread->LastPost;

		if ($post)
		{
			return $this->redirect($this->plugin('XF:Thread')->getPostLink($post));
		}
		else
		{
			return $this->redirect($this->buildLink('threads', $thread));
		}
	}

	public function actionPost(ParameterBag $params)
	{
		$postId = max(0, intval($params->post_id));
		if (!$postId)
		{
			return $this->notFound();
		}

		$visitor = \XF::visitor();
		$with = [
			'Thread',
			'Thread.Forum',
			'Thread.Forum.Node',
			'Thread.Forum.Node.Permissions|' . $visitor->permission_combination_id
		];

		$post = $this->em()->find('XF:Post', $postId, $with);
		if (!$post)
		{
			return $this->notFound();
		}
		if (!$post->canView($error))
		{
			return $this->noPermission($error);
		}

		return $this->redirectPermanently($this->plugin('XF:Thread')->getPostLink($post));
	}

	public function actionNewPosts(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id, ['FirstPost']);

		if (!$this->request->isXhr())
		{
			return $this->redirect($this->buildLink('threads', $thread));
		}

		$after = $this->filter('after', 'uint');
		return $this->getNewPostsReply($thread, $after);
	}

	public function actionPreview(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id, ['FirstPost']);
		$firstPost = $thread->FirstPost;

		$viewParams = [
			'thread' => $thread,
			'firstPost' => $firstPost
		];
		return $this->view('XF:Thread\Preview', 'thread_preview', $viewParams);
	}

	public function actionDraft(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id);

		/** @var \XF\ControllerPlugin\Draft $draftPlugin */
		$draftPlugin = $this->plugin('XF:Draft');

		$extraData = $this->filter([
			'attachment_hash' => 'str'
		]);

		$draftAction = $draftPlugin->updateMessageDraft($thread->draft_reply, $extraData);

		$lastDate = $this->filter('last_date', 'uint');
		$lastKnownDate = $this->filter('last_known_date', 'uint');
		$lastKnownDate = max($lastDate, $lastKnownDate);

		// the check for last date here is to make sure that we have a date we can log in a link
		if ($lastDate)
		{
			/** @var \XF\Mvc\Entity\Finder $postList */
			$postList = $this->getPostRepo()->findNewestPostsInThread($thread, $lastKnownDate)->skipIgnored();
			$hasNewPost = ($postList->total() > 0);
		}
		else
		{
			$hasNewPost = false;
		}

		$viewParams = [
			'thread' => $thread,
			'hasNewPost' => $hasNewPost,
			'lastDate' => $lastDate,
			'lastKnownDate' => $lastKnownDate
		];
		$view = $this->view('XF:Thread\Draft', 'thread_save_draft', $viewParams);
		$view->setJsonParam('hasNew', $hasNewPost);
		$draftPlugin->addDraftJsonParams($view, $draftAction);

		return $view;
	}

	/**
	 * @param \XF\Entity\Thread $thread
	 *
	 * @return \XF\Service\Thread\Replier
	 */
	protected function setupThreadReply(\XF\Entity\Thread $thread)
	{
		$message = $this->plugin('XF:Editor')->fromInput('message');

		/** @var \XF\Service\Thread\Replier $replier */
		$replier = $this->service('XF:Thread\Replier', $thread);

		$replier->setMessage($message);

		if ($thread->Forum->canUploadAndManageAttachments())
		{
			$replier->setAttachmentHash($this->filter('attachment_hash', 'str'));
		}

		return $replier;
	}

	protected function finalizeThreadReply(\XF\Service\Thread\Replier $replier)
	{
		$replier->sendNotifications();

		$thread = $replier->getThread();
		$post = $replier->getPost();
		$visitor = \XF::visitor();

		$setOptions = $this->filter('_xfSet', 'array-bool');
		if ($thread->canWatch())
		{
			if (isset($setOptions['watch_thread']))
			{
				$watch = $this->filter('watch_thread', 'bool');
				if ($watch)
				{
					/** @var \XF\Repository\ThreadWatch $threadWatchRepo */
					$threadWatchRepo = $this->repository('XF:ThreadWatch');

					$state = $this->filter('watch_thread_email', 'bool') ? 'watch_email' : 'watch_no_email';
					$threadWatchRepo->setWatchState($thread, $visitor, $state);
				}
			}
			else
			{
				// use user preferences
				$this->repository('XF:ThreadWatch')->autoWatchThread($thread, $visitor, false);
			}
		}

		if ($thread->canLockUnlock() && isset($setOptions['discussion_open']))
		{
			$thread->discussion_open = $this->filter('discussion_open', 'bool');
		}
		if ($thread->canStickUnstick() && isset($setOptions['sticky']))
		{
			$thread->sticky = $this->filter('sticky', 'bool');
		}

		$thread->saveIfChanged($null, false);

		if ($visitor->user_id)
		{
			$readDate = $thread->getVisitorReadDate();
			if ($readDate && $readDate >= $thread->getPreviousValue('last_post_date'))
			{
				$post = $replier->getPost();
				$this->getThreadRepo()->markThreadReadByVisitor($thread, $post->post_date);
			}

			$thread->draft_reply->delete();

			if ($post->message_state == 'moderated')
			{
				$this->session()->setHasContentPendingApproval();
			}
		}
	}

	public function actionReply(ParameterBag $params)
	{
		$visitor = \XF::visitor();

		$thread = $this->assertViewableThread($params->thread_id, ['Watch|' . $visitor->user_id]);
		if (!$thread->canReply($error))
		{
			return $this->noPermission($error);
		}

		$defaultMessage = '';
		$forceAttachmentHash = null;

		$quote = $this->filter('quote', 'uint');
		if ($quote)
		{
			/** @var \XF\Entity\Post $post */
			$post = $this->em()->find('XF:Post', $quote, 'User');
			if ($post && $post->thread_id == $thread->thread_id && $post->canView())
			{
				$defaultMessage = $post->getQuoteWrapper(
					$this->app->stringFormatter()->getBbCodeForQuote($post->message, 'post')
				);
				$forceAttachmentHash = '';
			}
		}
		else if ($this->request->exists('requires_captcha'))
		{
			$defaultMessage = $this->plugin('XF:Editor')->fromInput('message');
			$forceAttachmentHash = $this->filter('attachment_hash', 'str');
		}
		else
		{
			$defaultMessage = $thread->draft_reply->message;
		}

		$viewParams = [
			'thread' => $thread,
			'forum' => $thread->Forum,
			'attachmentData' => $this->getReplyAttachmentData($thread, $forceAttachmentHash),
			'defaultMessage' => $defaultMessage
		];
		return $this->view('XF:Thread\Reply', 'thread_reply', $viewParams);
	}

	public function actionAddReply(ParameterBag $params)
	{
		$this->assertPostOnly();

		$visitor = \XF::visitor();
		$thread = $this->assertViewableThread($params->thread_id, ['Watch|' . $visitor->user_id]);
		if (!$thread->canReply($error))
		{
			return $this->noPermission($error);
		}

		if ($this->filter('no_captcha', 'bool')) // JS is disabled so user hasn't seen Captcha.
		{
			$this->request->set('requires_captcha', true);
			return $this->rerouteController(__CLASS__, 'reply', $params);
		}
		else if (!$this->captchaIsValid())
		{
			return $this->error(\XF::phrase('did_not_complete_the_captcha_verification_properly'));
		}

		$replier = $this->setupThreadReply($thread);
		$replier->checkForSpam();

		if (!$replier->validate($errors))
		{
			return $this->error($errors);
		}
		$this->assertNotFlooding('post');
		$post = $replier->save();

		$this->finalizeThreadReply($replier);

		if ($this->filter('_xfWithData', 'bool') && $this->request->exists('last_date') && $post->canView())
		{
			// request was from quick reply
			$lastDate = $this->filter('last_date', 'uint');
			return $this->getNewPostsReply($thread, $lastDate);
		}
		else
		{
			$this->getThreadRepo()->markThreadReadByVisitor($thread);
			$confirmation = \XF::phrase('your_message_has_been_posted');

			if ($post->canView())
			{
				return $this->redirect($this->buildLink('posts', $post), $confirmation);
			}
			else
			{
				return $this->redirect($this->buildLink('threads', $thread, ['pending_approval' => 1]), $confirmation);
			}

		}
	}

	protected function getNewPostsReply(\XF\Entity\Thread $thread, $lastDate)
	{
		$postRepo = $this->getPostRepo();

		$limit = 3;

		/** @var \XF\Mvc\Entity\Finder $postList */
		$postList = $postRepo->findNewestPostsInThread($thread, $lastDate)->skipIgnored()->forFullView();
		$posts = $postList->fetch($limit + 1);

		// We fetched one more post than needed, if more than $limit posts were returned,
		// we can show the 'there are more posts' notice
		if ($posts->count() > $limit)
		{
			$firstUnshownPost = $posts->first();

			// Remove the extra post
			$posts = $posts->pop();
		}
		else
		{
			$firstUnshownPost = null;
		}

		// put the posts into oldest-first order
		$posts = $posts->reverse(true);

		/** @var \XF\Repository\Attachment $attachmentRepo */
		$attachmentRepo = $this->repository('XF:Attachment');
		$attachmentRepo->addAttachmentsToContent($posts, 'post');

		$visitor = \XF::visitor();
		$threadRead = $thread->Read[$visitor->user_id];

		if ($visitor->user_id)
		{
			if (!$firstUnshownPost || ($threadRead && $firstUnshownPost->post_date <= $threadRead->thread_read_date))
			{
				$this->getThreadRepo()->markThreadReadByVisitor($thread);
			}
		}

		$last = $posts->last();
		if ($last)
		{
			$lastDate = $last->post_date;
		}

		$viewParams = [
			'thread' => $thread,
			'posts' => $posts,
			'firstUnshownPost' => $firstUnshownPost
		];
		$view = $this->view('XF:Thread\NewPosts', 'thread_new_posts', $viewParams);
		$view->setJsonParam('lastDate', $lastDate);
		return $view;
	}

	public function actionReplyPreview(ParameterBag $params)
	{
		$this->assertPostOnly();

		$thread = $this->assertViewableThread($params->thread_id);
		if (!$thread->canReply($error))
		{
			return $this->noPermission($error);
		}

		$replier = $this->setupThreadReply($thread);
		if (!$replier->validate($errors))
		{
			return $this->error($errors);
		}

		$post = $replier->getPost();
		$attachments = [];

		$tempHash = $this->filter('attachment_hash', 'str');
		if ($tempHash && $thread->Forum->canUploadAndManageAttachments())
		{
			$attachRepo = $this->repository('XF:Attachment');
			$attachments = $attachRepo->findAttachmentsByTempHash($tempHash)->fetch();
		}

		return $this->plugin('XF:BbCodePreview')->actionPreview(
			$post->message, 'post', $post->User, $attachments, $thread->canViewAttachments()
		);
	}

	public function actionMultiQuote()
	{
		$this->assertPostOnly();

		/** @var \XF\ControllerPlugin\Quote $quotePlugin */
		$quotePlugin = $this->plugin('XF:Quote');

		$quotes = $this->filter('quotes', 'json-array');
		if (!$quotes)
		{
			return $this->error(\XF::phrase('no_messages_selected'));
		}
		$quotes = $quotePlugin->prepareQuotes($quotes);

		$postFinder = $this->finder('XF:Post');

		$posts = $postFinder
			->with(['User', 'Thread', 'Thread.Forum'])
			->where('post_id', array_keys($quotes))
			->order('post_date', 'DESC')
			->fetch()
			->filterViewable();

		if ($this->request->exists('insert'))
		{
			$insertOrder = $this->filter('insert', 'array');
			return $quotePlugin->actionMultiQuote($posts, $insertOrder, $quotes, 'post');
		}
		else
		{
			$viewParams = [
				'quotes' => $quotes,
				'posts' => $posts
			];
			return $this->view('XF:Thread\MultiQuote', 'thread_multi_quote', $viewParams);
		}
	}

	/**
	 * @param \XF\Entity\Thread $thread
	 *
	 * @return \XF\Service\Thread\Editor
	 */
	protected function setupThreadEdit(\XF\Entity\Thread $thread)
	{
		/** @var \XF\Service\Thread\Editor $editor */
		$editor = $this->service('XF:Thread\Editor', $thread);

		$prefixId = $this->filter('prefix_id', 'uint');
		if ($prefixId != $thread->prefix_id && !$thread->Forum->isPrefixUsable($prefixId))
		{
			$prefixId = 0; // not usable, just blank it out
		}
		$editor->setPrefix($prefixId);

		$editor->setTitle($this->filter('title', 'str'));

		$canLockUnlock = $thread->canLockUnlock();
		if ($canLockUnlock)
		{
			$editor->setDiscussionOpen($this->filter('discussion_open', 'bool'));
		}

		$canStickUnstick = $thread->canStickUnstick($error);
		if ($canStickUnstick)
		{
			$editor->setSticky($this->filter('sticky', 'bool'));
		}

		$customFields = $this->filter('custom_fields', 'array');
		$editor->setCustomFields($customFields);

		return $editor;
	}

	public function actionEdit(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id);
		if (!$thread->canEdit($error))
		{
			return $this->noPermission($error);
		}
		$forum = $thread->Forum;

		$noInlineMod = $this->filter('_xfNoInlineMod', 'bool');
		$forumName = $this->filter('_xfForumName', 'bool');

		if ($this->isPost())
		{
			$editor = $this->setupThreadEdit($thread);

			if (!$editor->validate($errors))
			{
				return $this->error($errors);
			}

			$editor->save();

			if ($this->filter('_xfWithData', 'bool') && $this->filter('_xfInlineEdit', 'bool'))
			{
				$viewParams = [
					'thread' => $thread,
					'forum' => $forum,

					'noInlineMod' => $noInlineMod,
					'forumName' => $forumName
				];
				$reply = $this->view('XF:Thread\EditInline', 'thread_edit_new_thread', $viewParams);
				$reply->setJsonParam('message', \XF::phrase('your_changes_have_been_saved'));
				return $reply;
			}
			return $this->redirect($this->buildLink('threads', $thread));
		}
		else
		{
			$prefix = $thread->Prefix;
			$prefixes = $forum->getUsablePrefixes($prefix);

			$viewParams = [
				'thread' => $thread,
				'forum' => $forum,
				'prefixes' => $prefixes,

				'noInlineMod' => $noInlineMod,
				'forumName' => $forumName
			];
			return $this->view('XF:Thread\Edit', 'thread_edit', $viewParams);
		}
	}

	public function actionQuickClose(ParameterBag $params)
	{
		$this->assertPostOnly();

		$thread = $this->assertViewableThread($params->thread_id);
		if (!$thread->canLockUnlock($error))
		{
			return $this->error($error);
		}

		/** @var \XF\Service\Thread\Editor $editor */
		$editor = $this->service('XF:Thread\Editor', $thread);

		if ($thread->discussion_open)
		{
			$editor->setDiscussionOpen(false);
			$text = \XF::phrase('open_thread');
		}
		else
		{
			$editor->setDiscussionOpen(true);
			$text = \XF::phrase('close_thread');
		}

		if (!$editor->validate($errors))
		{
			return $this->error($errors);
		}

		$editor->save();

		$reply = $this->redirect($this->getDynamicRedirect());
		$reply->setJsonParams([
			'text' => $text,
			'discussion_open' => $thread->discussion_open
		]);
		return $reply;
	}

	public function actionQuickStick(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id);
		if (!$thread->canStickUnstick($error))
		{
			return $this->error($error);
		}

		/** @var \XF\Service\Thread\Editor $editor */
		$editor = $this->service('XF:Thread\Editor', $thread);

		if ($thread->sticky)
		{
			$editor->setSticky(false);
			$text = \XF::phrase('stick_thread');
		}
		else
		{
			$editor->setSticky(true);
			$text = \XF::phrase('unstick_thread');
		}

		if (!$editor->validate($errors))
		{
			return $this->error($errors);
		}

		$editor->save();

		if ($this->filter('_xfWithData', 'bool') && !$this->filter('_xfRedirect', 'str'))
		{
			$reply = $this->view('XF:Thread\QuickStick');
			$reply->setJsonParams([
				'text' => $text,
				'sticky' => $thread->sticky,
				'message' => \XF::phrase('redirect_changes_saved_successfully')
			]);
			return $reply;
		}
		else
		{
			return $this->redirect($this->getDynamicRedirect());
		}
	}

	public function actionPollCreate(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id);

		$breadcrumbs = $thread->getBreadcrumbs();

		/** @var \XF\ControllerPlugin\Poll $pollPlugin */
		$pollPlugin = $this->plugin('XF:Poll');
		return $pollPlugin->actionCreate('thread', $thread, $breadcrumbs);
	}

	public function actionPollEdit(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id);
		$poll = $thread->Poll;

		$breadcrumbs = $thread->getBreadcrumbs();

		/** @var \XF\ControllerPlugin\Poll $pollPlugin */
		$pollPlugin = $this->plugin('XF:Poll');
		return $pollPlugin->actionEdit($poll, $breadcrumbs);
	}

	public function actionPollDelete(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id);
		$poll = $thread->Poll;

		$breadcrumbs = $thread->getBreadcrumbs();

		/** @var \XF\ControllerPlugin\Poll $pollPlugin */
		$pollPlugin = $this->plugin('XF:Poll');
		return $pollPlugin->actionDelete($poll, $breadcrumbs);
	}

	public function actionPollVote(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id);
		$poll = $thread->Poll;

		$breadcrumbs = $thread->getBreadcrumbs();

		/** @var \XF\ControllerPlugin\Poll $pollPlugin */
		$pollPlugin = $this->plugin('XF:Poll');
		return $pollPlugin->actionVote($poll, $breadcrumbs);
	}

	public function actionPollResults(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id);
		$poll = $thread->Poll;

		$breadcrumbs = $thread->getBreadcrumbs();

		/** @var \XF\ControllerPlugin\Poll $pollPlugin */
		$pollPlugin = $this->plugin('XF:Poll');
		return $pollPlugin->actionResults($poll, $breadcrumbs);
	}

	public function actionDelete(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id);
		if (!$thread->canDelete('soft', $error))
		{
			return $this->noPermission($error);
		}

		if ($this->isPost())
		{
			$type = $this->filter('hard_delete', 'bool') ? 'hard' : 'soft';
			$reason = $this->filter('reason', 'str');

			if (!$thread->canDelete($type, $error))
			{
				return $this->noPermission($error);
			}

			/** @var \XF\Service\Thread\Deleter $deleter */
			$deleter = $this->service('XF:Thread\Deleter', $thread);

			if ($this->filter('starter_alert', 'bool'))
			{
				$deleter->setSendAlert(true, $this->filter('starter_alert_reason', 'str'));
			}

			$deleter->delete($type, $reason);

			$this->plugin('XF:InlineMod')->clearIdFromCookie('thread', $thread->thread_id);

			return $this->redirect($this->buildLink('forums', $thread->Forum));
		}
		else
		{
			$viewParams = [
				'thread' => $thread,
				'forum' => $thread->Forum
			];
			return $this->view('XF:Thread\Delete', 'thread_delete', $viewParams);
		}
	}

	public function actionUndelete(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id);
		if (!$thread->canUndelete($error))
		{
			return $this->noPermission($error);
		}

		if ($this->isPost())
		{
			if ($thread->discussion_state == 'deleted')
			{
				$thread->discussion_state = 'visible';
				$thread->save();
			}

			return $this->redirect($this->buildLink('threads', $thread));
		}
		else
		{
			$viewParams = [
				'thread' => $thread,
				'forum' => $thread->Forum
			];
			return $this->view('XF:Thread\Undelete', 'thread_undelete', $viewParams);
		}
	}

	public function actionApprove(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id);
		if (!$thread->canApproveUnapprove($error))
		{
			return $this->noPermission($error);
		}

		if ($this->isPost())
		{
			/** @var \XF\Service\Thread\Approver $approver */
			$approver = \XF::service('XF:Thread\Approver', $thread);
			$approver->approve();

			return $this->redirect($this->buildLink('threads', $thread));
		}
		else
		{
			$viewParams = [
				'thread' => $thread,
				'forum' => $thread->Forum
			];
			return $this->view('XF:Thread\Approve', 'thread_approve', $viewParams);
		}
	}

	/**
	 * @param \XF\Entity\Thread $thread
	 * @param \XF\Entity\Forum $forum
	 *
	 * @return \XF\Service\Thread\Mover
	 */
	protected function setupThreadMove(\XF\Entity\Thread $thread, \XF\Entity\Forum $forum)
	{
		$options = $this->filter([
			'notify_watchers' => 'bool',
			'starter_alert' => 'bool',
			'starter_alert_reason' => 'str',
			'prefix_id' => 'uint'
		]);

		$redirectType = $this->filter('redirect_type', 'str');
		if ($redirectType == 'permanent')
		{
			$options['redirect'] = true;
			$options['redirect_length'] = 0;
		}
		else if ($redirectType == 'temporary')
		{
			$options['redirect'] = true;
			$options['redirect_length'] = $this->filter('redirect_length', 'timeoffset');
		}
		else
		{
			$options['redirect'] = false;
			$options['redirect_length'] = 0;
		}

		/** @var \XF\Service\Thread\Mover $mover */
		$mover = $this->service('XF:Thread\Mover', $thread);

		if ($options['starter_alert'])
		{
			$mover->setSendAlert(true, $options['starter_alert_reason']);
		}

		if ($options['notify_watchers'])
		{
			$mover->setNotifyWatchers();
		}

		if ($options['redirect'])
		{
			$mover->setRedirect(true, $options['redirect_length']);
		}

		if ($options['prefix_id'] !== null)
		{
			$mover->setPrefix($options['prefix_id']);
		}

		$mover->addExtraSetup(function($thread, $forum)
		{
			$thread->title = $this->filter('title', 'str');
		});

		return $mover;
	}

	public function actionMove(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id);
		if (!$thread->canMove($error))
		{
			return $this->noPermission($error);
		}
		$forum = $thread->Forum;

		if ($this->isPost())
		{
			$targetNodeId = $this->filter('target_node_id', 'uint');

			/** @var \XF\Entity\Forum $forum */
			$targetForum = $this->app()->em()->find('XF:Forum', $targetNodeId);
			if (!$targetForum || !$targetForum->canView())
			{
				return $this->error(\XF::phrase('requested_forum_not_found'));
			}

			$this->setupThreadMove($thread, $targetForum)->move($targetForum);

			return $this->redirect($this->buildLink('threads', $thread));
		}
		else
		{
			/** @var \XF\Repository\Node $nodeRepo */
			$nodeRepo = $this->app()->repository('XF:Node');
			$nodes = $nodeRepo->getFullNodeList()->filterViewable();

			$viewParams = [
				'thread' => $thread,
				'forum' => $forum,
				'prefixes' => $forum->getUsablePrefixes(),
				'nodeTree' => $nodeRepo->createNodeTree($nodes)
			];
			return $this->view('XF:Thread\Move', 'thread_move', $viewParams);
		}
	}

	public function actionTags(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id);
		if (!$thread->canEditTags($error))
		{
			return $this->noPermission($error);
		}

		/** @var \XF\Service\Tag\Changer $tagger */
		$tagger = $this->service('XF:Tag\Changer', 'thread', $thread);

		if ($this->isPost())
		{
			$tagger->setEditableTags($this->filter('tags', 'str'));
			if ($tagger->hasErrors())
			{
				return $this->error($tagger->getErrors());
			}

			$tagger->save();

			return $this->redirect($this->buildLink('threads', $thread));
		}
		else
		{
			$grouped = $tagger->getExistingTagsByEditability();

			$viewParams = [
				'thread' => $thread,
				'forum' => $thread->Forum,
				'editableTags' => $grouped['editable'],
				'uneditableTags' => $grouped['uneditable']
			];
			return $this->view('XF:Thread\Tags', 'thread_tags', $viewParams);
		}
	}

	public function actionWatch(ParameterBag $params)
	{
		$visitor = \XF::visitor();
		if (!$visitor->user_id)
		{
			return $this->noPermission();
		}

		$thread = $this->assertViewableThread($params->thread_id);
		if (!$thread->canWatch($error))
		{
			return $this->noPermission($error);
		}

		if ($this->isPost())
		{
			if ($this->filter('stop', 'bool'))
			{
				$newState = 'delete';
			}
			else if ($this->filter('email_subscribe', 'bool'))
			{
				$newState = 'watch_email';
			}
			else
			{
				$newState = 'watch_no_email';
			}

			/** @var \XF\Repository\ThreadWatch $watchRepo */
			$watchRepo = $this->repository('XF:ThreadWatch');
			$watchRepo->setWatchState($thread, $visitor, $newState);

			$redirect = $this->redirect($this->buildLink('threads', $thread));
			$redirect->setJsonParam('switchKey', $newState == 'delete' ? 'watch' : 'unwatch');
			return $redirect;
		}
		else
		{
			$viewParams = [
				'thread' => $thread,
				'isWatched' => !empty($thread->Watch[$visitor->user_id]),
				'forum' => $thread->Forum
			];
			return $this->view('XF:Thread\Watch', 'thread_watch', $viewParams);
		}
	}

	/**
	 * @param \XF\Entity\Thread $thread
	 *
	 * @return \XF\Service\Thread\ReplyBan|null
	 */
	protected function setupThreadReplyBan(\XF\Entity\Thread $thread)
	{
		$input = $this->filter([
			'username' => 'str',
			'ban_length' => 'str',
			'ban_length_value' => 'uint',
			'ban_length_unit' => 'str',

			'send_alert' => 'bool',
			'reason' => 'str'
		]);

		if (!$input['username'])
		{
			return null;
		}

		/** @var \XF\Entity\User $user */
		$user = $this->finder('XF:User')->where('username', $input['username'])->fetchOne();
		if (!$user)
		{
			throw $this->exception(
				$this->notFound(\XF::phrase('requested_user_x_not_found', ['name' => $input['username']]))
			);
		}

		/** @var \XF\Service\Thread\ReplyBan $replyBanService */
		$replyBanService = $this->service('XF:Thread\ReplyBan', $thread, $user);

		if ($input['ban_length'] == 'temporary')
		{
			$replyBanService->setExpiryDate($input['ban_length_unit'], $input['ban_length_value']);
		}
		else
		{
			$replyBanService->setExpiryDate(0);
		}

		$replyBanService->setSendAlert($input['send_alert']);
		$replyBanService->setReason($input['reason']);

		return $replyBanService;
	}

	public function actionReplyBans(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id);
		if (!$thread->canReplyBan($error))
		{
			return $this->noPermission($error);
		}

		if ($this->isPost())
		{
			$delete = $this->filter('delete', 'array-bool');
			$delete = array_filter($delete);

			$replyBanService = $this->setupThreadReplyBan($thread);
			if ($replyBanService)
			{
				if (!$replyBanService->validate($errors))
				{
					return $this->error($errors);
				}

				$replyBanService->save();

				// don't try to delete the record we just added
				unset($delete[$replyBanService->getUser()->user_id]);
			}

			if ($delete)
			{
				$replyBans = $thread->ReplyBans;
				foreach (array_keys($delete) AS $userId)
				{
					if (isset($replyBans[$userId]))
					{
						$replyBans[$userId]->delete();
					}
				}
			}

			return $this->redirect($this->getDynamicRedirect($this->buildLink('threads', $thread), false));
		}
		else
		{
			/** @var \XF\Repository\ThreadReplyBan $replyBanRepo */
			$replyBanRepo = $this->repository('XF:ThreadReplyBan');
			$replyBanFinder = $replyBanRepo->findReplyBansForThread($thread)->order('ban_date');

			$viewParams = [
				'thread' => $thread,
				'forum' => $thread->Forum,
				'bans' => $replyBanFinder->fetch()
			];
			return $this->view('XF:Thread\ReplyBans', 'thread_reply_bans', $viewParams);
		}
	}

	public function actionModeratorActions(ParameterBag $params)
	{
		$thread = $this->assertViewableThread($params->thread_id);
		if (!$thread->canViewModeratorLogs($error))
		{
			return $this->noPermission($error);
		}

		$breadcrumbs = $thread->getBreadcrumbs();
		$prefix = $this->app()->templater()->fn('prefix', ['thread', $thread, 'escaped']);
		$title = $prefix . $thread->title;

		$this->request()->set('page', $params->page);

		/** @var \XF\ControllerPlugin\ModeratorLog $modLogPlugin */
		$modLogPlugin = $this->plugin('XF:ModeratorLog');
		return $modLogPlugin->actionModeratorActions(
			$thread,
			['threads/moderator-actions', $thread],
			$title, $breadcrumbs
		);
	}

	/**
	 * @param $threadId
	 * @param array $extraWith
	 *
	 * @return \XF\Entity\Thread
	 *
	 * @throws \XF\Mvc\Reply\Exception
	 */
	protected function assertViewableThread($threadId, array $extraWith = [])
	{
		$visitor = \XF::visitor();

		$extraWith[] = 'Forum';
		$extraWith[] = 'Forum.Node';
		$extraWith[] = 'Forum.Node.Permissions|' . $visitor->permission_combination_id;
		if ($visitor->user_id)
		{
			$extraWith[] = 'Read|' . $visitor->user_id;
			$extraWith[] = 'Forum.Read|' . $visitor->user_id;
		}

		/** @var \XF\Entity\Thread $thread */
		$thread = $this->em()->find('XF:Thread', $threadId, $extraWith);
		if (!$thread)
		{
			throw $this->exception($this->notFound(\XF::phrase('requested_thread_not_found')));
		}

		if (!$thread->canView($error))
		{
			throw $this->exception($this->noPermission($error));
		}

		$this->plugin('XF:Node')->applyNodeContext($thread->Forum->Node);
		$this->setContentKey('thread-' . $thread->thread_id);

		return $thread;
	}

	protected function getReplyAttachmentData(\XF\Entity\Thread $thread, $forceAttachmentHash = null)
	{
		/** @var \XF\Entity\Forum $forum */
		$forum = $thread->Forum;

		if ($forum && $forum->canUploadAndManageAttachments())
		{
			if ($forceAttachmentHash !== null)
			{
				$attachmentHash = $forceAttachmentHash;
			}
			else
			{
				$attachmentHash = $thread->draft_reply->attachment_hash;
			}

			/** @var \XF\Repository\Attachment $attachmentRepo */
			$attachmentRepo = $this->repository('XF:Attachment');
			return $attachmentRepo->getEditorData('post', $thread, $attachmentHash);
		}
		else
		{
			return null;
		}
	}

	protected function canUpdateSessionActivity($action, ParameterBag $params, AbstractReply &$reply, &$viewState)
	{
		if (strtolower($action) == 'addreply')
		{
			$viewState = 'valid';
			return true;
		}
		return parent::canUpdateSessionActivity($action, $params, $reply, $viewState);
	}

	public static function getActivityDetails(array $activities)
	{
		return self::getActivityDetailsForContent(
			$activities, \XF::phrase('viewing_thread'), 'thread_id',
			function(array $ids)
			{
				$threads = \XF::em()->findByIds(
					'XF:Thread',
					$ids,
					['Forum', 'Forum.Node', 'Forum.Node.Permissions|' . \XF::visitor()->permission_combination_id]
				);

				$router = \XF::app()->router('public');
				$data = [];

				foreach ($threads->filterViewable() AS $id => $thread)
				{
					$data[$id] = [
						'title' => $thread->title,
						'url' => $router->buildLink('threads', $thread)
					];
				}

				return $data;
			}
		);
	}

	/**
	 * @return \XF\Repository\Thread
	 */
	protected function getThreadRepo()
	{
		return $this->repository('XF:Thread');
	}

	/**
	 * @return \XF\Repository\Post
	 */
	protected function getPostRepo()
	{
		return $this->repository('XF:Post');
	}
}