From 3e5e78a2c9b9209b4fae87bf9a1663d30095249a Mon Sep 17 00:00:00 2001
From: Rajesh Taneja <rajesh@moodle.com>
Date: Fri, 29 Nov 2013 14:19:12 +0800
Subject: [PATCH] MDL-40058 mod_wiki: Replaced add_to_log for page diff view
 with event

---
 mod/wiki/classes/event/page_diff_viewed.php | 100 ++++++++++++++++++++
 mod/wiki/diff.php                           |  14 ++-
 mod/wiki/lang/en/wiki.php                   |   1 +
 3 files changed, 114 insertions(+), 1 deletion(-)
 create mode 100644 mod/wiki/classes/event/page_diff_viewed.php

diff --git a/mod/wiki/classes/event/page_diff_viewed.php b/mod/wiki/classes/event/page_diff_viewed.php
new file mode 100644
index 00000000000..487ae03be2d
--- /dev/null
+++ b/mod/wiki/classes/event/page_diff_viewed.php
@@ -0,0 +1,100 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * mod_wiki diff viewed event.
+ *
+ * @package    mod_wiki
+ * @copyright  2013 Rajesh Taneja <rajesh@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace mod_wiki\event;
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * mod_wiki diff viewed event class.
+ *
+ * @package    mod_wiki
+ * @copyright  2013 Rajesh Taneja <rajesh@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class page_diff_viewed extends \core\event\base {
+    /**
+     * Init method.
+     *
+     * @return void
+     */
+    protected function init() {
+        $this->data['crud'] = 'r';
+        $this->data['level'] = self::LEVEL_PARTICIPATING;
+        $this->data['objecttable'] = 'wiki_pages';
+    }
+
+    /**
+     * Return localised event name.
+     *
+     * @return string
+     */
+    public static function get_name() {
+        return get_string('eventdiffviewed', 'mod_wiki');
+    }
+
+    /**
+     * Returns description of what happened.
+     *
+     * @return string
+     */
+    public function get_description() {
+        return 'User with id ' . $this->userid . ' viewed wiki diff for page id ' . $this->objectid;
+    }
+
+    /**
+     * Return the legacy event log data.
+     *
+     * @return array
+     */
+    protected function get_legacy_logdata() {
+        return(array($this->courseid, 'wiki', 'diff', 'diff.php?pageid=' . $this->objectid . '&comparewith=' .
+            $this->other['comparewith'] . '&compare=' .  $this->other['compare'], $this->objectid,
+            $this->context->instanceid));
+    }
+
+    /**
+     * Get URL related to the action.
+     *
+     * @return \moodle_url
+     */
+    public function get_url() {
+        return new \moodle_url('/mod/wiki/diff.php', array(
+            'pageid' => $this->objectid,
+            'comparewith' => $this->other['comparewith'],
+            'compare' => $this->other['compare']
+            ));
+    }
+
+    /**
+     * Custom validation.
+     *
+     * @throws \coding_exception
+     * @return void
+     */
+    protected function validate_data() {
+        if (!isset($this->other['comparewith']) || !isset($this->other['compare'])) {
+            throw new \coding_exception('The comparewith and compare need to be set in $other');
+        }
+    }
+}
diff --git a/mod/wiki/diff.php b/mod/wiki/diff.php
index cdd354c0d67..70c6de3acb0 100644
--- a/mod/wiki/diff.php
+++ b/mod/wiki/diff.php
@@ -73,7 +73,19 @@ $wikipage = new page_wiki_diff($wiki, $subwiki, $cm);
 $wikipage->set_page($page);
 $wikipage->set_comparison($compare, $comparewith);
 
-add_to_log($course->id, "wiki", "diff", "diff.php?pageid=".$pageid."&comparewith=".$comparewith."&compare=".$compare, $pageid, $cm->id);
+$event = \mod_wiki\event\page_diff_viewed::create(
+        array(
+            'context' => context_module::instance($cm->id),
+            'objectid' => $pageid,
+            'other' => array(
+                'comparewith' => $comparewith,
+                'compare' => $compare
+                )
+            ));
+$event->add_record_snapshot('wiki_pages', $page);
+$event->add_record_snapshot('wiki', $wiki);
+$event->add_record_snapshot('wiki_subwikis', $subwiki);
+$event->trigger();
 
 $wikipage->print_header();
 
diff --git a/mod/wiki/lang/en/wiki.php b/mod/wiki/lang/en/wiki.php
index 67fabc55f17..1d965185606 100644
--- a/mod/wiki/lang/en/wiki.php
+++ b/mod/wiki/lang/en/wiki.php
@@ -62,6 +62,7 @@ $string['editing'] = 'Editing wiki page';
 $string['editingcomment'] = 'Editing comment';
 $string['editingpage'] = 'Editing this page \'{$a}\'';
 $string['editsection'] = 'edit';
+$string['eventdiffviewed'] = 'Wiki diff viewed';
 $string['eventhistoryviewed'] = 'Wiki history viewed';
 $string['eventpageviewed'] = 'Wiki page viewed';
 $string['eventpageupdated'] = 'Wiki page updated';