<?php

class Page_News extends Page
{
	/*
	 * Member variables needed to represent a news entry.
	 */

	/**
	 * @var int ID of the news entry attributed by the database.
	 */
	private $newsId = false;
	/**
	 * @var string Title of the entry.
	 */
	private $newsTitle = false;
	/**
	 * @var string Content as text. (TODO: html-Support?)
	 */
	private $newsContent = false;
	/**
	 * @var int Unix epoch date of the news' creation.
	 */
	private $newsDate = false;
	private $helpContent = '';
	private $editHelp = false;
	private $hasSummernote = false;

	/**
	 * Implementation of the abstract doPreprocess function.
	 *
	 * Checks if the user is logged in and processes any
	 * action if one was specified in the request.
	 */
	protected function doPreprocess()
	{
		/* load summernote module if available */
		$this->hasSummernote = Module::isAvailable('summernote');

		// load user, we will need it later
		User::load();
		if (!User::isLoggedIn()) {
			Message::addError('main.no-permission');
			Util::redirect('?do=Main');
		}

		// check which action we need to do
		$action = Request::any('action', 'show');
		if ($action === 'clear') {
			// clear news input fields
			// TODO: is this the right way?
			$this->newsId = false;
			$this->newsTitle = false;
			$this->newsContent = false;
			$this->newsDate = false;
		} elseif ($action === 'show') {
			/* load latest things */
			$this->loadLatest('help');
			$this->loadLatest('news');

			/* and also the news (or help) with the given id */
			if (!$this->loadNews(Request::any('newsid'))) {
				Message::addError('news-empty');
			}

			if (Request::any('editHelp')) {
				$this->editHelp = true;
			}
		} elseif ($action === 'save') {
			// save to DB
			/* find out whether it's news or help */
			$pageType = Request::post('news-type');

			if ($pageType === 'news') {
				User::assertPermission("news.save");
				if (!$this->saveNews()) {
					// re-set the fields we got
					$this->newsTitle = Request::post('news-title', false, 'string');
					$this->newsContent = Request::post('news-content', false, 'string');
				} else {
					Message::addSuccess('news-save-success');
					$lastId = Database::lastInsertId();
					Util::redirect("?do=News&newsid=$lastId");
				}
			} elseif ($pageType === 'help') {
				User::assertPermission("help.save");
				if ($this->saveHelp()) {
					Message::addSuccess('help-save-success');
					$lastId = Database::lastInsertId();
					Util::redirect("?do=News&newsid=$lastId");
				}
			}
		} elseif ($action === 'delete') {
			// delete it
			$pageType = Request::post('news-type');

			if ($pageType === 'news') {
				User::assertPermission("news.delete");
				$this->delNews(Request::post('newsid'));
				Util::redirect('?do=News&editHelp=' . Request::any('editHelp'));
			} elseif ($pageType === 'help') {
				User::assertPermission("help.delete");
				$this->delNews(Request::post('newsid'));
				Util::redirect('?do=News&editHelp=' . Request::any('editHelp'));
			}
		} else {
			// unknown action, redirect user
			Message::addError('invalid-action', $action);
		}
	}

	/**
	 * Implementation of the abstract doRender function.
	 *
	 * Fetch the list of news from the database and paginate it.
	 */
	protected function doRender()
	{
		// fetch the list of the older news
		$lines = array();
		$paginate = new Paginate("SELECT newsid, dateline, title, content FROM vmchooser_pages WHERE type='news' ORDER BY dateline DESC", 10);
		$res = $paginate->exec();
		while ($row = $res->fetch(PDO::FETCH_ASSOC)) {
			$row['date'] = date('d.m.Y H:i', $row['dateline']);

			if ($row['newsid'] == $this->newsId) {
				$row['active'] = 'active';
			}
			$row['content'] = strip_tags(str_replace('>', '> ', $row['content']));
			$lines[] = $row;
		}
		// fetch the list of the older helps
		$linesHelp = array();
		$paginateHelp = new Paginate("SELECT newsid, dateline, content FROM vmchooser_pages WHERE type='help' ORDER BY dateline DESC", 10);
		$resHelp = $paginateHelp->exec();
		while ($row = $resHelp->fetch(PDO::FETCH_ASSOC)) {
			$row['date'] = date('d.m.Y H:i', $row['dateline']);
			if ($row['newsid'] == $this->newsId) {
				$row['active'] = 'active';
			}
			$row['content'] = strip_tags(str_replace('>', '> ', $row['content']));
			$linesHelp[] = $row;
		}

		$data = array(
			'token' => Session::get('token'),
			'latestDate' => ($this->newsDate ? date('d.m.Y H:i', $this->newsDate) : '--'),
			'latestContent' => $this->newsContent,
			'latestTitle' => $this->newsTitle,
			'latestHelp' => $this->helpContent,
			'editHelp' => $this->editHelp,
			'list' => $lines,
			'listHelp' => $linesHelp,
			'hasSummernote' => $this->hasSummernote,
		);
		Permission::addGlobalTags($data['perms'], null, ['news.save', 'news.delete', 'help.save', 'help.delete']);

		$paginate->render('page-news', $data);
	}

	/**
	 * Loads the news with the given ID into the form.
	 *
	 * @param int $newsId ID of the news to be shown.
	 *
	 * @return bool true if loading that news worked
	 */
	private function loadNews($newsId)
	{
		// check to see if we need to request a specific newsid
		if ($newsId !== false) {
			$row = Database::queryFirst('SELECT newsid, title, content, dateline, type FROM vmchooser_pages WHERE newsid = :newsid LIMIT 1', array(
				'newsid' => $newsId,
			));
		} else {
			$row = Database::queryFirst("SELECT newsid, title, content, dateline, type FROM vmchooser_pages WHERE type='news' ORDER BY dateline DESC LIMIT 1");
		}

		// fetch the news to be shown
		if ($row !== false) {
			if ($row['type'] == 'news') {
				$this->newsId = $row['newsid'];
				$this->newsTitle = $row['title'];
				$this->newsContent = $row['content'];
				$this->newsDate = $row['dateline'];
				$this->editHelp = false;
			} else {
				$this->editHelp = true;
				$this->helpContent = $row['content'];
			}
		}

		return $row !== false;
	}

	private function loadLatest($type)
	{
		$row = Database::queryFirst("SELECT newsid, title, content, dateline, type FROM vmchooser_pages WHERE type=:type ORDER BY dateline DESC LIMIT 1", ['type' => $type]);
		if ($row !== false) {
			if ($row['type'] == 'news') {
				$this->newsId = $row['newsid'];
				$this->newsTitle = $row['title'];
				$this->newsContent = $row['content'];
				$this->newsDate = $row['dateline'];
			} else {
				$this->helpContent = $row['content'];
			}
		}
	}

	/**
	 * Save the given $newsTitle and $newsContent as POST'ed into the database.
	 */
	private function saveNews()
	{
		// check if news content were set by the user
		$newsTitle = Request::post('news-title');
		$newsContent = Request::post('news-content');
		if ($newsContent !== '' && $newsTitle !== '') {
			// we got title and content, save it to DB
			Database::exec("INSERT INTO vmchooser_pages (dateline, title, content, type) VALUES (:dateline, :title, :content, 'news')", array(
				'dateline' => time(),
				'title' => $newsTitle,
				'content' => $newsContent,
			));

			return true;
		} else {
			Message::addError('main.empty-field');

			return false;
		}
	}

	private function saveHelp()
	{
		$content = Request::post('help-content');
		if ($content !== '') {
			Database::exec("INSERT INTO vmchooser_pages (dateline, content, type) VALUES (:dateline, :content, 'help')", array(
				'dateline' => time(),
				'content' => $content,
			));

			return true;
		} else {
			Message::addError('main.empty-field');

			return false;
		}
	}

	/**
	 * Delete the news entry with ID $newsId.
	 *
	 * @param int $newsId ID of the entry to be deleted.
	 */
	private function delNews($newsId)
	{
		// sanity check: is newsId even numeric?
		if (!is_numeric($newsId)) {
			Message::addError('main.value-invalid', 'newsid', $newsId);
		} else {
			// check passed - do delete
			Database::exec('DELETE FROM vmchooser_pages WHERE newsid = :newsid LIMIT 1', array(
				'newsid' => $newsId,
			));
			Message::addSuccess('news-del-success');
		}
	}
}