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+<?php
+/**
+ * Display a conversation in the browser
+ *
+ * PHP version 5
+ *
+ * @category Action
+ * @package Laconica
+ * @author Evan Prodromou <evan@controlyourself.ca>
+ * @license http://www.fsf.org/licensing/licenses/agpl.html AGPLv3
+ * @link http://laconi.ca/
+ *
+ * Laconica - a distributed open-source microblogging tool
+ * Copyright (C) 2009, Control Yourself, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+if (!defined('LACONICA')) {
+ exit(1);
+}
+
+require_once INSTALLDIR.'/lib/noticelist.php';
+
+/**
+ * Conversation tree in the browser
+ *
+ * @category Action
+ * @package Laconica
+ * @author Evan Prodromou <evan@controlyourself.ca>
+ * @license http://www.fsf.org/licensing/licenses/agpl.html AGPLv3
+ * @link http://laconi.ca/
+ */
+
+class ConversationAction extends Action
+{
+ var $id = null;
+ var $page = null;
+
+ /**
+ * Initialization.
+ *
+ * @param array $args Web and URL arguments
+ *
+ * @return boolean false if id not passed in
+ */
+
+ function prepare($args)
+ {
+ parent::prepare($args);
+ $this->id = $this->trimmed('id');
+ if (empty($this->id)) {
+ return false;
+ }
+ $this->page = $this->trimmed('page');
+ if (empty($this->page)) {
+ $this->page = 1;
+ }
+ return true;
+ }
+
+ /**
+ * Handle the action
+ *
+ * @param array $args Web and URL arguments
+ *
+ * @return void
+ */
+
+ function handle($args)
+ {
+ parent::handle($args);
+ $this->showPage();
+ }
+
+ /**
+ * Returns the page title
+ *
+ * @return string page title
+ */
+
+ function title()
+ {
+ return _("Conversation");
+ }
+
+ /**
+ * Show content.
+ *
+ * Display a hierarchical unordered list in the content area.
+ * Uses ConversationTree to do most of the heavy lifting.
+ *
+ * @return void
+ */
+
+ function showContent()
+ {
+ // FIXME this needs to be a tree, not a list
+
+ $qry = 'SELECT * FROM notice WHERE conversation = %s ';
+
+ $offset = ($this->page-1) * NOTICES_PER_PAGE;
+ $limit = NOTICES_PER_PAGE + 1;
+
+ $txt = sprintf($qry, $this->id);
+
+ $notices = Notice::getStream($txt,
+ 'notice:conversation:'.$this->id,
+ $offset, $limit);
+
+ $ct = new ConversationTree($notices, $this);
+
+ $cnt = $ct->show();
+
+ $this->pagination($this->page > 1, $cnt > NOTICES_PER_PAGE,
+ $this->page, 'conversation', array('id' => $this->id));
+ }
+
+}
+
+/**
+ * Conversation tree
+ *
+ * The widget class for displaying a hierarchical list of notices.
+ *
+ * @category Widget
+ * @package Laconica
+ * @author Evan Prodromou <evan@controlyourself.ca>
+ * @license http://www.fsf.org/licensing/licenses/agpl.html AGPLv3
+ * @link http://laconi.ca/
+ */
+
+class ConversationTree extends NoticeList
+{
+ var $tree = null;
+ var $table = null;
+
+ /**
+ * Show the tree of notices
+ *
+ * @return void
+ */
+
+ function show()
+ {
+ $cnt = 0;
+
+ $this->tree = array();
+ $this->table = array();
+
+ while ($this->notice->fetch()) {
+
+ $cnt++;
+
+ $id = $this->notice->id;
+ $notice = clone($this->notice);
+
+ $this->table[$id] = $notice;
+
+ if (is_null($notice->reply_to)) {
+ $this->tree['root'] = array($notice->id);
+ } else if (array_key_exists($notice->reply_to, $this->tree)) {
+ $this->tree[$notice->reply_to][] = $notice->id;
+ } else {
+ $this->tree[$notice->reply_to] = array($notice->id);
+ }
+ }
+
+ $this->out->elementStart('div', array('id' =>'notices_primary'));
+ $this->out->element('h2', null, _('Notices'));
+ $this->out->elementStart('ol', array('class' => 'notices xoxo'));
+
+ if (array_key_exists('root', $this->tree)) {
+ $rootid = $this->tree['root'][0];
+ $this->showNoticePlus($rootid);
+ }
+
+ $this->out->elementEnd('ol');
+ $this->out->elementEnd('div');
+
+ return $cnt;
+ }
+
+ /**
+ * Shows a notice plus its list of children.
+ *
+ * @param integer $id ID of the notice to show
+ *
+ * @return void
+ */
+
+ function showNoticePlus($id)
+ {
+ $notice = $this->table[$id];
+
+ // We take responsibility for doing the li
+
+ $this->out->elementStart('li', array('class' => 'hentry notice',
+ 'id' => 'notice-' . $id));
+
+ $item = $this->newListItem($notice);
+ $item->show();
+
+ if (array_key_exists($id, $this->tree)) {
+ $children = $this->tree[$id];
+
+ $this->out->elementStart('ol', array('class' => 'notices'));
+
+ foreach ($children as $child) {
+ $this->showNoticePlus($child);
+ }
+
+ $this->out->elementEnd('ol');
+ }
+
+ $this->out->elementEnd('li');
+ }
+
+ /**
+ * Override parent class to return our preferred item.
+ *
+ * @param Notice $notice Notice to display
+ *
+ * @return NoticeListItem a list item to show
+ */
+
+ function newListItem($notice)
+ {
+ return new ConversationTreeItem($notice, $this->out);
+ }
+}
+
+/**
+ * Conversation tree list item
+ *
+ * Special class of NoticeListItem for use inside conversation trees.
+ *
+ * @category Widget
+ * @package Laconica
+ * @author Evan Prodromou <evan@controlyourself.ca>
+ * @license http://www.fsf.org/licensing/licenses/agpl.html AGPLv3
+ * @link http://laconi.ca/
+ */
+
+class ConversationTreeItem extends NoticeListItem
+{
+ /**
+ * start a single notice.
+ *
+ * The default creates the <li>; we skip, since the ConversationTree
+ * takes care of that.
+ *
+ * @return void
+ */
+
+ function showStart()
+ {
+ return;
+ }
+
+ /**
+ * finish the notice
+ *
+ * The default closes the <li>; we skip, since the ConversationTree
+ * takes care of that.
+ *
+ * @return void
+ */
+
+ function showEnd()
+ {
+ return;
+ }
+
+ /**
+ * show link to notice conversation page
+ *
+ * Since we're only used on the conversation page, we skip this
+ *
+ * @return void
+ */
+
+ function showContext()
+ {
+ return;
+ }
+}