From 05574af1a675a48b64f3caa16e533395db174331 Mon Sep 17 00:00:00 2001
From: Shamim Rezaie <shamim@moodle.com>
Date: Thu, 9 Jan 2020 01:43:51 +1100
Subject: [PATCH] MDL-69166 enrol_fee: Implement callback functions for payment
 subsystem

---
 enrol/fee/classes/payment/provider.php | 78 ++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 enrol/fee/classes/payment/provider.php

diff --git a/enrol/fee/classes/payment/provider.php b/enrol/fee/classes/payment/provider.php
new file mode 100644
index 00000000000..56e40e2ff18
--- /dev/null
+++ b/enrol/fee/classes/payment/provider.php
@@ -0,0 +1,78 @@
+<?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/>.
+
+/**
+ * Payment subsystem callback implementation for enrol_fee.
+ *
+ * @package    enrol_fee
+ * @category   payment
+ * @copyright  2020 Shamim Rezaie <shamim@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace enrol_fee\payment;
+
+/**
+ * Payment subsystem callback implementation for enrol_fee.
+ *
+ * @copyright  2020 Shamim Rezaie <shamim@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class provider implements \core_payment\local\callback\provider {
+
+    /**
+     * Callback function that returns the enrolment cost for the course that $instanceid enrolment instance belongs to.
+     *
+     * @param int $instanceid The enrolment instance id
+     * @return array['amount' => float, 'currency' => string]
+     */
+    public static function get_cost(int $instanceid): array {
+        global $DB;
+
+        $instance = $DB->get_record('enrol', ['enrol' => 'fee', 'id' => $instanceid], '*', MUST_EXIST);
+
+        return [
+            'amount' => (float) $instance->cost,
+            'currency' => $instance->currency,
+        ];
+    }
+
+    /**
+     * Callback function that delivers what the user paid for to them.
+     *
+     * @param int $instanceid The enrolment instance id
+     * @return bool Whether successful or not
+     */
+    public static function deliver_order(int $instanceid): bool {
+        global $DB, $USER;
+
+        $instance = $DB->get_record('enrol', ['enrol' => 'fee', 'id' => $instanceid], '*', MUST_EXIST);
+
+        $plugin = enrol_get_plugin('fee');
+
+        if ($instance->enrolperiod) {
+            $timestart = time();
+            $timeend   = $timestart + $instance->enrolperiod;
+        } else {
+            $timestart = 0;
+            $timeend   = 0;
+        }
+
+        $plugin->enrol_user($instance, $USER->id, $instance->roleid, $timestart, $timeend);
+
+        return true;
+    }
+}