Adicionar funcionalidades para o Book Club

application/usecases/saveBookSuggestionForBookClubUseCase/saveBookSuggestionForBookClubUseCase.ts

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+import ChatService from "../../../domain/service/chatService";
+import SaveBookSuggestionForBookClubUseCaseInput from "./saveBookSuggestionForBookClubUseCaseInput";
+import BookSuggestionsRepository from "../../../domain/repository/bookSuggestionsRepository";
+import BookSuggestion from "../../../domain/entity/bookSuggestion";
+
+export default class SaveBookSuggestionForBookClubUseCase {
+  private bookSuggestionsRepository: BookSuggestionsRepository;
+
+  private chatService: ChatService;
+
+  constructor({
+    chatService,
+    bookSuggestionsRepository,
+  }: {
+    chatService: ChatService;
+    bookSuggestionsRepository: BookSuggestionsRepository;
+  }) {
+    this.chatService = chatService;
+    this.bookSuggestionsRepository = bookSuggestionsRepository;
+  }
+
+  async execute({ title, link, channelId }: SaveBookSuggestionForBookClubUseCaseInput): Promise<void> {
+    const bookSuggestionAlreadyExists = this.bookSuggestionsRepository.findByTitle(title);
+    if (bookSuggestionAlreadyExists) {
+      this.chatService.sendMessageToChannel(
+        `Infelizmente o conteúdo **"${title}"** já tinha sido sugerido.`,
+        channelId
+      );
+      return;
+    }
+
+    this.bookSuggestionsRepository.add(new BookSuggestion({ title, link }));
+    this.chatService.sendMessageToChannel(`A sugestão **"${title}"** foi enviada.`, channelId);
+  }
+}

application/usecases/saveBookSuggestionForBookClubUseCase/saveBookSuggestionForBookClubUseCaseInput.ts

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+export default interface SaveBookSuggestionForBookClubUseCaseInput {
+  title: string;
+  link: string;
+  channelId: string;
+}

domain/entity/bookSuggestion.ts

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+export default class BookSuggestion {
+  private readonly title: string;
+
+  private readonly link: string;
+
+  constructor({ title, link }: { title: string; link: string }) {
+    this.title = title;
+    this.link = link;
+  }
+
+  getTitle(): string {
+    return this.title;
+  }
+
+  getLink(): string {
+    return this.link;
+  }
+}

domain/repository/bookSuggestionsRepository.ts

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+import BookSuggestion from "../entity/bookSuggestion";
+
+export default interface BookSuggestionsRepository {
+  add(bookSuggestion: BookSuggestion): void;
+  findByTitle(title: string): BookSuggestion | null;
+}

vitest/application/usecases/saveBookSuggestionForBookClubUseCase.spec.ts

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+import { vi, describe, it, expect } from "vitest";
+import SaveBookSuggestionForBookClubUseCase from "../../../application/usecases/saveBookSuggestionForBookClubUseCase/saveBookSuggestionForBookClubUseCase";
+import BookSuggestion from "../../../domain/entity/bookSuggestion";
+
+describe("send book suggestion for book club use case", () => {
+  it("should save in book suggestions repository the suggested book", async () => {
+    const bookSuggestionsRepository = {
+      add: vi.fn(),
+      findByTitle: vi.fn(),
+    };
+
+    const chatService = {
+      sendMessageToChannel: vi.fn(),
+    };
+
+    await new SaveBookSuggestionForBookClubUseCase({
+      bookSuggestionsRepository,
+      chatService,
+    }).execute({
+      title: "The Lord of the Rings",
+      link: "https://www.amazon.com/Lord-Rings-1-3-J-R-R-Tolkien/dp/0618260307",
+      channelId: "855861944930402342",
+    });
+
+    expect(bookSuggestionsRepository.add).toHaveBeenCalledWith({
+      title: "The Lord of the Rings",
+      link: "https://www.amazon.com/Lord-Rings-1-3-J-R-R-Tolkien/dp/0618260307",
+    });
+  });
+
+  it("should send a message from chatService thanking the user", async () => {
+    const bookSuggestionsRepository = {
+      add: vi.fn(),
+      findByTitle: vi.fn(),
+    };
+
+    const chatService = {
+      sendMessageToChannel: vi.fn(),
+    };
+
+    const spy = vi.spyOn(chatService, "sendMessageToChannel");
+
+    await new SaveBookSuggestionForBookClubUseCase({
+      bookSuggestionsRepository,
+      chatService,
+    }).execute({
+      title: "The Lord of the Rings",
+      link: "https://www.amazon.com/Lord-Rings-1-3-J-R-R-Tolkien/dp/0618260307",
+      channelId: "855861944930402342",
+    });
+
+    expect(spy).toHaveBeenCalledTimes(1);
+    expect(spy).toHaveBeenCalledWith('A sugestão **"The Lord of the Rings"** foi enviada.', "855861944930402342");
+  });
+
+  it("should send a message from chatService in case the book was already suggested", async () => {
+    const bookSuggestionsRepository = {
+      add: vi.fn(),
+      findByTitle: () =>
+        new BookSuggestion({
+          title: "The Lord of the Rings",
+          link: "https://www.amazon.com/Lord-Rings-1-3-J-R-R-Tolkien/dp/0618260307",
+        }),
+    };
+
+    const chatService = {
+      sendMessageToChannel: vi.fn(),
+    };
+
+    const spy = vi.spyOn(chatService, "sendMessageToChannel");
+
+    await new SaveBookSuggestionForBookClubUseCase({
+      bookSuggestionsRepository,
+      chatService,
+    }).execute({
+      title: "The Lord of the Rings",
+      link: "https://www.amazon.com/Lord-Rings-1-3-J-R-R-Tolkien/dp/0618260307",
+      channelId: "855861944930402342",
+    });
+
+    expect(spy).toHaveBeenCalledTimes(1);
+    expect(spy).toHaveBeenCalledWith(
+      'Infelizmente o conteúdo **"The Lord of the Rings"** já tinha sido sugerido.',
+      "855861944930402342"
+    );
+  });
+});