From 8c8a014d8772bdbc4cc81b28ee3d00930e84245b Mon Sep 17 00:00:00 2001
From: radekBednarik <radek.bednarik@tesena.com>
Date: Fri, 1 Nov 2024 12:51:34 +0100
Subject: [PATCH] dev: wip

---
 src/client/client.ts           |  5 +++++
 src/helpers/helpers.ts         |  7 +++++--
 src/helpers/sequential.ts      | 25 +++++++++++++++++++++++++
 src/helpers/sequential_test.ts | 28 ++++++++++++++++++++++++++++
 4 files changed, 63 insertions(+), 2 deletions(-)
 create mode 100644 src/helpers/sequential.ts
 create mode 100644 src/helpers/sequential_test.ts

diff --git a/src/client/client.ts b/src/client/client.ts
index abfb2c8..f6fcd94 100644
--- a/src/client/client.ts
+++ b/src/client/client.ts
@@ -7,6 +7,7 @@ import VaccinationPlaces from "../vaccination/vaccination-places.ts";
 import VaccinationFacilities from "../vaccination/vaccination-facilities.ts";
 import VaccinationDeaths from "../vaccination/vaccination-deaths.ts";
 import VaccinationDemographic from "../vaccination/vaccination-demographic.ts";
+import Helpers from "../helpers/helpers.ts";
 
 /**
  * Represents single entrypoint for calling supported
@@ -35,6 +36,8 @@ export default class Client {
   public readonly vaccinationDeaths: VaccinationDeaths;
   /** @property vaccinationDemographic - represents instance of the VaccinationDemographic class */
   public readonly vaccinationDemographic: VaccinationDemographic;
+  /** @property helpers - represents instance of the Helpers class */
+  public readonly helpers: Helpers;
   /** @property instance - holds the singleton instance of the class */
   private static instance: Client;
 
@@ -61,6 +64,8 @@ export default class Client {
     this.vaccinationFacilities = new VaccinationFacilities(this.token);
     this.vaccinationDeaths = new VaccinationDeaths(this.token);
     this.vaccinationDemographic = new VaccinationDemographic(this.token);
+
+    this.helpers = new Helpers(this.token);
   }
 
   /**
diff --git a/src/helpers/helpers.ts b/src/helpers/helpers.ts
index 0f5d5f8..bc96c53 100644
--- a/src/helpers/helpers.ts
+++ b/src/helpers/helpers.ts
@@ -1,9 +1,12 @@
-import type { GetApiError } from "../common/api.ts";
-
+import Sequential from "./sequential.ts";
 export default class Helpers {
   private readonly token: string;
 
+  public readonly sequentialSameApi: Sequential;
+
   constructor(token: string) {
     this.token = token;
+
+    this.sequentialSameApi = new Sequential();
   }
 }
diff --git a/src/helpers/sequential.ts b/src/helpers/sequential.ts
new file mode 100644
index 0000000..f3a9068
--- /dev/null
+++ b/src/helpers/sequential.ts
@@ -0,0 +1,25 @@
+import type { GetApiError } from "../common/api.ts";
+
+export default class Sequential {
+  constructor() {}
+
+  public async call<T>(
+    handler: (
+      { page, itemsPerPage }: { page: number; itemsPerPage: number },
+    ) => Promise<[T, null] | [null, GetApiError]>,
+    options: { pages: { start: number; end: number }; itemsPerPage: number },
+  ) {
+    const data: Array<[T, null] | [null, GetApiError]> = [];
+
+    for (let page = options.pages.start; page <= options.pages.end; page++) {
+      const result = await handler({
+        page,
+        itemsPerPage: options.itemsPerPage,
+      });
+
+      data.push(result);
+    }
+
+    return data;
+  }
+}
diff --git a/src/helpers/sequential_test.ts b/src/helpers/sequential_test.ts
new file mode 100644
index 0000000..fe7e0a8
--- /dev/null
+++ b/src/helpers/sequential_test.ts
@@ -0,0 +1,28 @@
+import { beforeAll, describe, it } from "@std/testing/bdd";
+import { expect } from "@std/expect";
+import "@std/dotenv/load";
+import Client from "../index.ts";
+
+let client: Client;
+
+describe("helpers", () => {
+  beforeAll(() => {
+    client = Client.getInstance({ token: Deno.env.get("CLIENT_TOKEN") });
+  });
+
+  describe("call sequentially same api endpoint - hospitalizations", () => {
+    it("happy - should return data of all called pages", async () => {
+      console.log(client)
+      const result = await client.helpers.sequentialSameApi.call(
+        client.hospitalization.getHospitalizationsV3,
+        { pages: { start: 1, end: 10 }, itemsPerPage: 1 },
+      );
+
+      expect(result).toBeInstanceOf(Array);
+      expect(result).toHaveLength(10);
+      expect(result[0]).toBeInstanceOf(Array);
+      expect(result[0][1]).toBeNull();
+      expect(result[0][0]).toHaveLength(1);
+    });
+  });
+});