From 828913efd2f94314bdae18dcc8cc1e2aa98c76f9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nikolas=20G=C3=B6rlitz?= <git@ngoerlitz.de>
Date: Sat, 19 Aug 2023 12:50:34 +0200
Subject: [PATCH] mentor: delete planned training session

---
 src/Router.ts                                 |  1 +
 .../TrainingSessionAdminController.ts         | 63 +++++++++++++++++--
 src/core/Config.ts                            |  3 +
 3 files changed, 62 insertions(+), 5 deletions(-)

diff --git a/src/Router.ts b/src/Router.ts
index 0ab1c3d..45ba157 100644
--- a/src/Router.ts
+++ b/src/Router.ts
@@ -157,6 +157,7 @@ router.use(
             "/training-session",
             routerGroup((r: Router) => {
                 r.put("/training", TrainingSessionAdminController.createTrainingSession);
+                r.delete("/training", TrainingSessionAdminController.deleteTrainingSession);
                 // TODO r.put("/lesson");
             })
         );
diff --git a/src/controllers/training-session/TrainingSessionAdminController.ts b/src/controllers/training-session/TrainingSessionAdminController.ts
index 043ebe3..da876f1 100644
--- a/src/controllers/training-session/TrainingSessionAdminController.ts
+++ b/src/controllers/training-session/TrainingSessionAdminController.ts
@@ -7,6 +7,9 @@ import { generateUUID } from "../../utility/UUID";
 import dayjs from "dayjs";
 import { TrainingRequest } from "../../models/TrainingRequest";
 import { TrainingSessionBelongsToUsers } from "../../models/through/TrainingSessionBelongsToUsers";
+import { HttpStatusCode } from "axios";
+import NotificationLibrary from "../../libraries/notification/NotificationLibrary";
+import { Config } from "../../core/Config";
 
 /**
  * Creates a new training session with one user and one mentor
@@ -28,7 +31,7 @@ async function createTrainingSession(request: Request, response: Response) {
     }
 
     // 1. Find out which of these users is actually enrolled in the course. To do this, query the course and it's members, and check against the array of user_ids. Create a new actual array with only those people
-    // that are actually enroled in this course.
+    // that are actually enrolled in this course.
     let courseParticipants: number[] = [];
     const course = await Course.findOne({
         where: {
@@ -38,7 +41,7 @@ async function createTrainingSession(request: Request, response: Response) {
     });
 
     if (course == null) {
-        response.sendStatus(500);
+        response.sendStatus(HttpStatusCode.BadRequest);
         return;
     }
 
@@ -50,7 +53,7 @@ async function createTrainingSession(request: Request, response: Response) {
     });
 
     if (courseParticipants.length == 0) {
-        response.status(400).send({ error: "No specified user was a member of this course." });
+        response.status(HttpStatusCode.BadRequest).send({ error: "No specified user was a member of this course." });
         return;
     }
 
@@ -65,7 +68,7 @@ async function createTrainingSession(request: Request, response: Response) {
     });
 
     if (trainingSession == null) {
-        response.sendStatus(500);
+        response.sendStatus(HttpStatusCode.InternalServerError);
         return;
     }
 
@@ -103,9 +106,59 @@ async function createTrainingSession(request: Request, response: Response) {
         });
     }
 
-    response.send(data.user_ids);
+    response.send(trainingSession);
+}
+
+/**
+ * Deletes a training session by a mentor
+ * All users that are participants of this course are placed back in the queue
+ */
+async function deleteTrainingSession(request: Request, response: Response) {
+    const user: User = request.body.user;
+    const data = request.body as {training_session_id: number};
+
+    const session = await TrainingSession.findOne({
+        where: {
+            id: data.training_session_id,
+            mentor_id: user.id,
+        },
+        include: [TrainingSession.associations.users, TrainingSession.associations.course]
+    });
+
+    if (session == null) {
+        response.sendStatus(HttpStatusCode.BadRequest);
+        return;
+    }
+
+    session.users?.forEach((participant) => {
+        NotificationLibrary.sendUserNotification({
+            user_id: participant.id,
+            author_id: user.id,
+            message_de: `Deine Session im Kurs ${session.course?.name} am ${dayjs.utc(session.date).format(Config.DATE_FORMAT)} wurde gelöscht. Dein Request wurde wieder in der Warteliste plaziert.`,
+            message_en: `Your Session in the course ${session.course?.name} on ${dayjs.utc(session.date).format(Config.DATE_FORMAT)} was deleted. Your Request was placed in the waiting list.`,
+            severity: "danger",
+            icon: "alert-triangle"
+        });
+    });
+
+    // Update training requests to reflect the now non-existent session
+    await TrainingRequest.update({
+        status: "requested",
+        training_session_id: null
+    }, {
+        where: {
+            training_session_id: session.id
+        }
+    });
+
+    // Destroying the session also destroys the related training_session_belongs_to_users
+    // entries with this course, due to their foreign relationships
+    await session.destroy();
+
+    response.sendStatus(HttpStatusCode.NoContent);
 }
 
 export default {
     createTrainingSession,
+    deleteTrainingSession
 };
diff --git a/src/core/Config.ts b/src/core/Config.ts
index ef49de9..b015afb 100644
--- a/src/core/Config.ts
+++ b/src/core/Config.ts
@@ -81,6 +81,9 @@ export const Config = {
         HOST: process.env.DB_HOST,
         PORT: Number(process.env.DB_PORT),
     },
+
+    DATE_FORMAT: "DD.MM.YYYY",
+    DATETIME_FORMAT: "DD.MM.YYYY HH:mm",
 };
 
 export const SequelizeConfig: Options = {