import assert from "node:assert/strict";
import test from "node:test";
import { getGmailCredentials, sendEmail, type MailTransport } from "./email";

const env = {
  GMAIL_SMTP_USER: "rjbulk01@gmail.com",
  GMAIL_SMTP_APP_PASSWORD: "test-app-password",
};

test("getGmailCredentials rejects missing Gmail configuration", () => {
  assert.throws(
    () => getGmailCredentials({}),
    { message: "Gmail email credentials are not configured" },
  );
});

test("sendEmail uses the authenticated Gmail user and forwards the message", async () => {
  const sent: unknown[] = [];
  const transport: MailTransport = {
    async sendMail(message) {
      sent.push(message);
      return {};
    },
  };

  await sendEmail(
    {
      to: "customer@example.com",
      subject: "Delivery statement",
      html: "<p>Statement attached.</p>",
      attachments: [
        {
          filename: "statement.pdf",
          content: Buffer.from("pdf-bytes"),
        },
      ],
    },
    { env, transport },
  );

  assert.deepEqual(sent, [
    {
      from: "rjbulk01@gmail.com",
      to: "customer@example.com",
      subject: "Delivery statement",
      html: "<p>Statement attached.</p>",
      attachments: [
        {
          filename: "statement.pdf",
          content: Buffer.from("pdf-bytes"),
        },
      ],
    },
  ]);
});

test("sendEmail hides provider error details and credentials", async () => {
  const secret = "test-app-password";
  const transport: MailTransport = {
    async sendMail() {
      throw new Error(`authentication failed for ${secret}`);
    },
  };

  await assert.rejects(
    sendEmail(
      {
        to: "customer@example.com",
        subject: "Delivery statement",
        html: "<p>Statement attached.</p>",
      },
      { env, transport },
    ),
    (error: unknown) =>
      error instanceof Error &&
      error.message === "Gmail email send failed" &&
      !error.message.includes(secret),
  );
});