import { afterEach, describe, expect, test, vi } from "vitest";
import { buildRetryJobOptions, buildTransactionalMailJob, queueNames, type TypedQueue } from "@toolctrl/queue";
import { queueTransactionalEmail } from "./TransactionalEmailQueue.server";

const runtimeQueue = {
  add: vi.fn(async () => ({ id: "job_from_env" })),
  close: vi.fn(async () => undefined),
};
const originalRedisEnv = {
  BULLMQ_REDIS_URL: process.env.BULLMQ_REDIS_URL,
  REDIS_URL: process.env.REDIS_URL,
};

function restoreRedisEnv() {
  for (const [key, value] of Object.entries(originalRedisEnv)) {
    if (value === undefined) {
      delete process.env[key];
    } else {
      process.env[key] = value;
    }
  }
}

vi.mock("@toolctrl/queue/runtime", () => ({
  createQueue: vi.fn(() => runtimeQueue),
}));

afterEach(() => {
  vi.clearAllMocks();
  restoreRedisEnv();
});

describe("queueTransactionalEmail", () => {
  test("fails closed without Redis configuration", async () => {
    await expect(
      queueTransactionalEmail(
        {
          to: "user@example.com",
          subject: "Reset password",
          body: "<p>Reset</p>",
          alias: "password-reset",
        },
        {
          env: {},
        }
      )
    ).rejects.toThrow("Redis connection required to enqueue transactional email.");
  });

  test("enqueues transactional email payloads", async () => {
    const add = vi.fn(async () => ({ id: "job_1" }));
    const queue = { add } as unknown as TypedQueue<typeof queueNames.email>;

    const result = await queueTransactionalEmail(
      {
        to: "user@example.com",
        subject: "Reset password",
        body: "<p>Reset</p>",
        alias: "password-reset",
        tenantId: "tenant_1",
        userId: "user_1",
        data: { action_url: "https://example.com/reset" },
      },
      {
        queue,
      }
    );

    expect(result).toEqual({ enqueued: true, jobId: "job_1" });
    expect(add).toHaveBeenCalledOnce();
    const descriptor = buildTransactionalMailJob({
      to: ["user@example.com"],
      subject: "Reset password",
      html: "<p>Reset</p>",
      templateData: { action_url: "https://example.com/reset" },
      tenantId: "tenant_1",
      userId: "user_1",
      metadata: { alias: "password-reset" },
    });
    expect(add).toHaveBeenCalledWith(
      "send-transactional-email",
      descriptor.payload,
      expect.objectContaining({
        ...buildRetryJobOptions(descriptor),
        // priority is resolved from tenantId; without a registered plan
        // lookup it falls back to NORMAL (5).
        priority: 5,
      })
    );
  });

  test("uses process Redis configuration by default", async () => {
    process.env.BULLMQ_REDIS_URL = "redis://localhost:6379/2";

    const result = await queueTransactionalEmail({
      to: "user@example.com",
      subject: "Reset password",
      body: "<p>Reset</p>",
      alias: "password-reset",
    });

    expect(result).toEqual({ enqueued: true, jobId: "job_from_env" });
    expect(runtimeQueue.add).toHaveBeenCalledOnce();
    expect(runtimeQueue.close).toHaveBeenCalledOnce();
  });

  test("propagates enqueue failures without synchronous mail fallback", async () => {
    const enqueueError = new Error("queue unavailable");
    const add = vi.fn(async () => {
      throw enqueueError;
    });
    const queue = { add } as unknown as TypedQueue<typeof queueNames.email>;

    await expect(
      queueTransactionalEmail(
        {
          to: "user@example.com",
          subject: "Welcome",
          body: "<p>Welcome</p>",
          alias: "registration-welcome",
          data: { firstName: "Ada" },
        },
        {
          queue,
        }
      )
    ).rejects.toThrow(enqueueError);

    expect(add).toHaveBeenCalledOnce();
    const descriptor = buildTransactionalMailJob({
      to: ["user@example.com"],
      subject: "Welcome",
      html: "<p>Welcome</p>",
      templateData: { firstName: "Ada" },
      metadata: { alias: "registration-welcome" },
    });
    expect(add).toHaveBeenCalledWith(
      "send-transactional-email",
      expect.objectContaining({
        kind: "mail.transactional",
        templateData: { firstName: "Ada" },
        metadata: { alias: "registration-welcome" },
      }),
      buildRetryJobOptions(descriptor)
    );
  });
});