import { describe, expect, it, mock } from "bun:test";
import { createPostmarkClient } from "./client.js";

const mockSendEmail = mock(() =>
  Promise.resolve({ MessageID: "test-message-id-123" }),
);

void mock.module("postmark", () => ({
  ServerClient: class MockServerClient {
    sendEmail = mockSendEmail;
  },
}));

describe("createPostmarkClient", () => {
  it("should create an EmailClient with sendEmail method", () => {
    const client = createPostmarkClient("test-api-key");
    expect(typeof client.sendEmail).toBe("function");
  });

  it("should throw an error if API key is empty", () => {
    expect(() => createPostmarkClient("")).toThrow(
      "Postmark API key is required",
    );
  });

  it("should convert our interface to Postmark format and return converted result", async () => {
    const client = createPostmarkClient("test-api-key");

    const result = await client.sendEmail({
      from: "sender@example.com",
      to: "recipient@example.com",
      subject: "Test Subject",
      htmlBody: "<p>HTML</p>",
      textBody: "Text",
    });

    expect(mockSendEmail).toHaveBeenCalledWith({
      From: "sender@example.com",
      To: "recipient@example.com",
      Subject: "Test Subject",
      HtmlBody: "<p>HTML</p>",
      TextBody: "Text",
    });
    expect(result.messageId).toBe("test-message-id-123");
  });
});