update delete behavior when have thread and beautify code

back/mails/room/Room.ts

@@ -0,0 +1,46 @@
+import { deleteRoom, getRoomNbMessageAndThread, getRoomOnMessageId } from "../../db/Room-db";
+
+export default class Room {
+    private _roomId: number;
+    constructor() {
+        this._roomId;
+    }
+
+    setRoomId(roomId: number): Room {
+        this._roomId = roomId;
+        return this;
+    }
+
+    get roomId(): number {
+        return this._roomId;
+    }
+
+    async setRoomIdOnMessageId(messageId: number): Promise<Room> {
+        const res = await getRoomOnMessageId(messageId);
+        if (res.length == 0) {
+            throw "Message has no room";
+        }
+        this._roomId = res[0].room_id;
+        return this;
+    }
+
+    async shouldDelete(): Promise<boolean> {
+        if (!this._roomId) {
+            throw "shouldDelete needs to have a roomId set.";
+        }
+        const res = await getRoomNbMessageAndThread(this._roomId);
+        if (res.length === 0) return true;
+        if (res[0].nbMessage === 0 && res[0].nbThread === 0) {
+            return true;
+        }
+        return false;
+    }
+
+    async delete(): Promise<Room> {
+        if (!this._roomId) {
+            throw "shouldDelete needs to have a roomId set.";
+        }
+        await deleteRoom(this._roomId);
+        return this;
+    }
+}