Creating delete function

classes/framework.php

@@ -915,6 +915,30 @@ public function getLibraryUsage($id, $skipcontent = false) {
         );
     }
 
+    /**
+     * Implements getLibraryUsageNames
+     *
+     * Get the names of dependencies to other libraries
+     *
+     * @param int $id
+     * @return array The array contains the names of the dependet libraries
+     */
+
+    public function getLibraryUsageNames($id) {
+        global $DB;
+
+        // Count the libraries and get their names
+        $librariesNames = $DB->get_records_sql(
+            "SELECT rl.title
+        FROM {hvp_libraries_libraries} ll
+        JOIN {hvp_libraries} rl ON rl.id = ll.library_id
+        WHERE ll.required_library_id = ?", array($id)
+        );
+
+        // Return a list with the library names
+        return $librariesNames;
+    }
+
     /**
      * Implements getLibraryContentCount
      */

delete_library_page.php

@@ -0,0 +1,96 @@
+<?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/>.
+/**
+ * Responsible for handling the deletion of a library
+ *
+ * @package    mod_hvp
+ * @copyright  2016 Joubel AS <contact@joubel.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+require_once("../../config.php");
+require_once($CFG->libdir.'/adminlib.php');
+require_once("locallib.php");
+
+// No guest autologin.
+require_login(0, false);
+
+$libraryid = required_param('library_id', PARAM_INT);
+$confirm = optional_param('confirm', 0, PARAM_BOOL);  // Confirmation flag
+$pageurl = new moodle_url('/mod/hvp/delete_library_page.php', array('library_id' => $libraryid));
+$PAGE->set_url($pageurl);
+admin_externalpage_setup('h5plibraries');
+$PAGE->set_title("{$SITE->shortname}: " . get_string('deletelibrary', 'hvp'));
+
+// Inform Moodle which menu entry currently is active!
+$core = \mod_hvp\framework::instance();
+global $DB;
+
+// Check if the library exists and has no dependencies
+$library = $DB->get_record('hvp_libraries', array('id' => $libraryid), '*', MUST_EXIST);
+$usage = $core->h5pF->getLibraryUsage($libraryid);
+$usageNames = $core->h5pF->getLibraryUsageNames($libraryid);
+$usageNamesArray = array_keys($usageNames);
+$usageNamesString = implode(', ', $usageNamesArray);
+
+$PAGE->set_heading(get_string('deleteheading', 'hvp', $library->title . ' (' . \H5PCore::libraryVersion($library) . ')'));
+
+if ($confirm) {
+    if ($usage['content'] === 0) {
+        $dependencies = $DB->get_records('hvp_libraries_libraries', array('required_library_id' => $library->id));
+
+        foreach ($dependencies as $dependency) {
+            //Get all dependent libraries
+            $dependentLibrary = $DB->get_record('hvp_libraries', array('id' => $dependency->library_id));
+
+            if ($dependentLibrary) {
+                // Delete dependent libraries
+                \H5PCore::deleteFileTree($core->h5pF->getH5pPath() . '/libraries/' . "{$dependentLibrary->name}-{$dependentLibrary->major_version}.{$dependentLibrary->minor_version}");
+
+                $DB->delete_records('hvp_libraries_libraries', array('library_id' => $dependentLibrary->id));
+                $DB->delete_records('hvp_libraries_languages', array('library_id' => $dependentLibrary->id));
+                $DB->delete_records('hvp_libraries', array('id' => $dependentLibrary->id));
+            }
+        }
+
+        // Delete inital library
+        $librarybase = $core->h5pF->getH5pPath() . '/libraries/';
+        $libname = "{$library->name}-{$library->major_version}.{$library->minor_version}";
+        \H5PCore::deleteFileTree("{$librarybase}{$libname}");
+
+        // Remove library data from database.
+        $DB->delete_records('hvp_libraries_libraries', array('library_id' => $library->id));
+        $DB->delete_records('hvp_libraries_languages', array('library_id' => $library->id));
+        $DB->delete_records('hvp_libraries', array('id' => $library->id));
+
+        redirect(new moodle_url('/mod/hvp/library_list.php'), get_string('librarydeleted',  'hvp', $library->title . ' (' . \H5PCore::libraryVersion($library) . ')'), null, \core\output\notification::NOTIFY_SUCCESS);
+    } else {
+        // Library cannot be deleted, show error message
+        echo $OUTPUT->header();
+        echo $OUTPUT->notification(get_string('cannotdeletelibrary',  'hvp', $library->title . ' (' . \H5PCore::libraryVersion($library) . ')'), 'notifyproblem');
+        echo $OUTPUT->continue_button(new moodle_url('/mod/hvp/library_list.php'));
+        echo $OUTPUT->footer();
+    }
+} else {
+    // Ask for confirmation
+    echo $OUTPUT->header();
+    echo $OUTPUT->confirm(
+        get_string('confirmlibrary',  'hvp', $usageNamesString),
+        new moodle_url('/mod/hvp/delete_library_page.php', array('library_id' => $libraryid, 'confirm' => 1)),
+        new moodle_url('/mod/hvp/library_list.php')
+    );
+    echo $OUTPUT->footer();
+}

lang/en/hvp.php

@@ -167,6 +167,13 @@
 $string['upgradeerrortoohighversion'] = 'Parameters contain %used while only %supported or earlier are supported.';
 $string['upgradeerrornotsupported'] = 'Parameters contain %used which is not supported.';
 
+// Delete H5P library page labels
+$string['deletelibrary'] = 'Delete H5P library';
+$string['deleteheading'] = 'Delete {$a}';
+$string['cannotdeletelibrary'] = 'Could not delete library {$a}';
+$string['librarydeleted'] = 'You have successfully deleted {$a}';
+$string['confirmlibrary'] = 'Are you sure you want to delete this library? You will also delete {$a}';
+
 // Results / report page.
 $string['user'] = 'User';
 $string['score'] = 'Score';

library_list.php

@@ -87,6 +87,12 @@
             $restrictedurl = null;
         }
 
+        // Generate delete URL for all libraries
+            $deleteurl = (new moodle_url('/mod/hvp/delete_library_page.php', array(
+                'library_id' => $library->id
+            )))->out(false);
+
+
         $settings['libraryList']['listData'][] = array(
             'title' => $library->title . ' (' . \H5PCore::libraryVersion($library) . ')',
             'restricted' => $restricted,
@@ -96,7 +102,7 @@
             'numLibraryDependencies' => $usage['libraries'],
             'upgradeUrl' => $upgradeurl,
             'detailsUrl' => null, // Not implemented in Moodle.
-            'deleteUrl' => null // Not implemented in Moodle.
+            'deleteUrl' => $deleteurl
         );
 
         $i++;