From a6e7c80c539c6e85a5679ffdb604ecb4f4b57578 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Patrick=20M=C3=BCller?= <patrick@mueller-patrick.tech>
Date: Fri, 1 Oct 2021 18:04:40 +0200
Subject: [PATCH] API-31: Endpoint to get single rapla event details

---
 .../DHBWRaPlaChanges.router.ts                | 18 ++++++
 .../changes/changes.service.ts                | 61 +++++++++++++++++++
 2 files changed, 79 insertions(+)

diff --git a/src/models/dhbw-rapla-changes/DHBWRaPlaChanges.router.ts b/src/models/dhbw-rapla-changes/DHBWRaPlaChanges.router.ts
index 705d28c..1e424cc 100644
--- a/src/models/dhbw-rapla-changes/DHBWRaPlaChanges.router.ts
+++ b/src/models/dhbw-rapla-changes/DHBWRaPlaChanges.router.ts
@@ -28,3 +28,21 @@ dhbwRaPlaChangesRouter.get('/', async (req: Request, res: Response) => {
         });
     }
 });
+
+dhbwRaPlaChangesRouter.get('/:id', async (req: Request, res: Response) => {
+    try {
+        let id: string = (req.params.id ?? '').toString();
+
+        let changes = await ChangeService.getEventById('TINF19B4', id);
+
+        res.status(200).send(changes);
+    } catch (e) {
+        let errorGuid = Guid.create().toString();
+        logger.error('Error handling a request: ' + e.message, {reference: errorGuid});
+        res.status(500).send({
+            'status': 'PROCESSING_ERROR',
+            'message': 'Internal Server Error. Try again later.',
+            'reference': errorGuid
+        });
+    }
+});
diff --git a/src/models/dhbw-rapla-changes/changes/changes.service.ts b/src/models/dhbw-rapla-changes/changes/changes.service.ts
index 0182bb2..e235934 100644
--- a/src/models/dhbw-rapla-changes/changes/changes.service.ts
+++ b/src/models/dhbw-rapla-changes/changes/changes.service.ts
@@ -84,3 +84,64 @@ export const getChanges = async (course: string, week: string): Promise<Event[]>
         }
     }
 };
+
+export const getEventById = async (course: string, id: string): Promise<Event> => {
+    let conn;
+    try {
+        conn = await pool.getConnection();
+
+        let rows = await conn.query('SELECT c.change_id, c.entry_id, c.change_timestamp, c.isDeleted, c.new_summary, c.new_description, c.new_start, c.new_last_modified, c.new_end, c.new_created, c.new_location, c.new_organizer, c.new_categories, e.uid FROM rapla_changes c LEFT OUTER JOIN rapla_entries e ON c.entry_id = e.entry_id WHERE e.uid = ? ORDER BY c.change_id', id);
+
+        let eventsMap = new Map();
+
+        for (let row of rows) {
+            let change: Change = {
+                change_id: row.change_id,
+                event_id: row.event_id,
+                change_timestamp: row.change_timestamp,
+                is_deleted: row.isDeleted,
+                new_summary: row.new_summary,
+                new_description: row.new_description,
+                new_start: row.new_start,
+                new_end: row.new_end,
+                new_last_modified: row.new_last_modified,
+                new_created: row.new_created,
+                new_location: row.new_location,
+                new_organizer: row.new_organizer,
+                new_categories: row.new_categories,
+                new_recurring: row.new_recurring
+            };
+
+            if (eventsMap.has(row.entry_id)) {
+                let event = eventsMap.get(row.entry_id);
+
+                // Only adjust these fields if the event is not deleted as otherwise they would be null
+                if (!row.isDeleted) {
+                    event.latest_event_summary = row.new_summary;
+                    event.latest_start_date = row.new_start;
+                }
+                event.changes.push(change);
+
+                eventsMap.set(row.entry_id, event);
+            } else {
+                let event: Event = {
+                    event_id: row.event_id,
+                    event_uid: row.uid,
+                    latest_event_summary: row.new_summary,
+                    latest_start_date: row.new_start,
+                    changes: [change]
+                };
+
+                eventsMap.set(row.entry_id, event);
+            }
+        }
+
+        return Array.from(eventsMap.values())[0];
+    } catch (err) {
+        throw err;
+    } finally {
+        if (conn) {
+            conn.end();
+        }
+    }
+};