group-call-002 - declarative filters

group-call-002/app.js

@@ -1,16 +1,20 @@
 import express from "express";
 import { EventsCollection } from "./EventsCollection.js";
 import { UsersCollection } from "./UsersCollection.js";
-import { getTicketsAvailable } from "./getTicketsAvailable.js";
+import { getTicketsByQuery } from "./getTicketsByQuery.js";
 
 const app = express();
 
 app.get("/", (req, res) => {
-  res.send("Hello World!");
+  res.send("Hello World");
 });
 
 app.get("/tickets-available", (req, res) => {
-  return res.json(getTicketsAvailable(req.query));
+  return res.json(getTicketsByQuery({ ...query, status: "upcoming" }));
+});
+
+app.get("/tickets", (req, res) => {
+  return res.json(getTicketsByQuery(req.query));
 });
 
 const port = 3000 || process.env.PORT;

group-call-002/getTicketsByQuery.js

@@ -0,0 +1,44 @@
+import { UsersCollection } from "./UsersCollection.js";
+import { EventsCollection } from "./EventsCollection.js";
+
+const Filters = {
+  BY_NAME: {
+    execute({ query: { eventName }, event }) {
+      return !eventName || event.eventName.includes(eventName);
+    },
+  },
+  BY_DATE: {
+    execute({ query: { eventDate }, event }) {
+      return !eventDate || event.eventDate === eventDate;
+    },
+  },
+  BY_QUANTITY: {
+    execute({ query: { quantity }, event }) {
+      return !quantity || event.quantity >= quantity;
+    },
+  },
+  BY_STATUS: {
+    execute({ query: { status }, event }) {
+      return !status || event.eventStatus === status;
+    },
+  },
+  BY_USER_VIP: {
+    execute({ event, user }) {
+      return user?.isVIP || !event.onlyVIPUsers;
+    },
+  },
+};
+
+export function getTicketsByQuery(query) {
+  const user = UsersCollection.find().find((user) => user.userId === +query.userId);
+
+  return EventsCollection.find().filter((event) => {
+    return Object.values(Filters).every(({ execute }) =>
+      execute({
+        event,
+        user,
+        query,
+      }),
+    );
+  });
+}

group-call-002/getTicketsByQuery.test.js

@@ -0,0 +1,19 @@
+import { getTicketsByQuery } from "./getTicketsByQuery.js";
+
+describe("getTicketsByQuery", () => {
+  test("returns empty array when there are no events", () => {
+    const events = getTicketsByQuery({
+      eventName: "Con",
+      quantity: 101,
+      status: "upcoming",
+    });
+    expect(events.length).toBe(0);
+  });
+  test(`returns all events with "Con" for VIP User`, () => {
+    const events = getTicketsByQuery({
+      userId: 1,
+      eventName: "Con",
+    });
+    expect(events.length).toBe(2);
+  });
+});

group-call-002/package.json

@@ -6,6 +6,7 @@
   "type": "module",
   "scripts": {
     "start": "node app.js",
+    "dev:watch": "node --watch app.js",
     "test": "jest"
   },
   "repository": {