import { describe, it, expect, vi, beforeEach } from "vitest";

// pg-boss + db mocks. Hoisted so the vi.mock factories below can refer
// to the spies — see https://vitest.dev/api/vi.html#vi-hoisted.
const {
  bossSendMock,
  dbExecuteMock,
} = vi.hoisted(() => ({
  bossSendMock: vi.fn(async (..._args: unknown[]) => "new-job-id"),
  dbExecuteMock: vi.fn(async (..._args: unknown[]) => ({ rows: [] as unknown[] })),
}));

vi.mock("../db.js", () => ({
  db: { execute: (...a: unknown[]) => dbExecuteMock(...a) },
}));
vi.mock("../logger.js", () => ({
  logger: { info: vi.fn(), warn: vi.fn(), error: vi.fn() },
}));

// We don't import pg-boss directly — scheduleReminderFire receives a
// PgBoss instance as its first arg. Build a minimal stub that exposes
// just the .send method (and createQueue / work for registerReminderJobs
// if we ever wire it here).
const fakeBoss = {
  send: bossSendMock,
} as unknown as Parameters<typeof scheduleReminderFire>[0];

import { scheduleReminderFire } from "./reminder-jobs.js";

const REMINDER_ID = "11111111-1111-1111-1111-111111111111";
const SINGLETON_KEY = `reminder:${REMINDER_ID}`;
const FIRE_AT = new Date("2026-05-10T12:20:00.000Z");

beforeEach(() => {
  bossSendMock.mockReset();
  bossSendMock.mockResolvedValue("new-job-id");
  dbExecuteMock.mockReset();
  dbExecuteMock.mockResolvedValue({ rows: [] });
});

describe("scheduleReminderFire — pre-send cancel of stale created jobs", () => {
  it("ALWAYS runs the cancel-stale UPDATE before boss.send (regression: stately dedupe dropped reschedules)", async () => {
    // Repro of the dropped-fire bug: the queue was on policy=stately
    // and a prior schedule had left a 'created' job in pg-boss with
    // the same singletonKey. The new send returned null and the
    // user's 8:20 PM fire was silently lost. Under the fix, we MUST
    // tombstone any prior created jobs FIRST so the new send wins
    // even under standard policy.
    dbExecuteMock.mockResolvedValueOnce({ rows: [{ id: "stale-1" }] });
    const result = await scheduleReminderFire(fakeBoss, REMINDER_ID, FIRE_AT);
    // Order matters: cancel happens before send.
    expect(dbExecuteMock).toHaveBeenCalledTimes(1);
    expect(bossSendMock).toHaveBeenCalledTimes(1);
    expect(dbExecuteMock.mock.invocationCallOrder[0]).toBeLessThan(
      bossSendMock.mock.invocationCallOrder[0]!,
    );
    expect(result).toBe("new-job-id");
  });

  it("scopes the cancel to state='created' only — active/completed jobs MUST survive", async () => {
    // The cancel must NOT touch in-flight runs (state='active') nor
    // historical fires (state='completed'). Otherwise we'd nuke the
    // run that's currently sending and the user gets phantom 'failed'
    // rows in the activity feed.
    await scheduleReminderFire(fakeBoss, REMINDER_ID, FIRE_AT);
    const sqlStmt = dbExecuteMock.mock.calls[0]![0];
    // Drizzle's sql template returns an SQL object; serialise to inspect.
    const text = JSON.stringify(sqlStmt);
    expect(text).toMatch(/state\s*=\s*'?created'?/);
    expect(text).not.toMatch(/state\s*=\s*'?active'?/);
    expect(text).not.toMatch(/state\s*=\s*'?completed'?/);
  });

  it("targets only THIS reminder's singletonKey (doesn't cross-cancel other reminders)", async () => {
    await scheduleReminderFire(fakeBoss, REMINDER_ID, FIRE_AT);
    const sqlStmt = dbExecuteMock.mock.calls[0]![0];
    const text = JSON.stringify(sqlStmt);
    // The reminderId must appear in the WHERE clause's bound params
    // (drizzle stores them in the serialised payload).
    expect(text).toContain(REMINDER_ID);
  });

  it("passes the singleton key through to boss.send for diagnostics", async () => {
    await scheduleReminderFire(fakeBoss, REMINDER_ID, FIRE_AT);
    const [, , opts] = bossSendMock.mock.calls[0]!;
    expect(opts).toMatchObject({
      singletonKey: SINGLETON_KEY,
      startAfter: FIRE_AT,
      retryLimit: 3,
    });
  });

  it("still sends when the cancel UPDATE returns zero rows (first-time schedule)", async () => {
    // First time scheduling a reminder — no stale rows exist.
    dbExecuteMock.mockResolvedValueOnce({ rows: [] });
    const result = await scheduleReminderFire(fakeBoss, REMINDER_ID, FIRE_AT);
    expect(bossSendMock).toHaveBeenCalledTimes(1);
    expect(result).toBe("new-job-id");
  });

  it("DEGRADES SAFELY: if the cancel UPDATE throws, the send still runs", async () => {
    // pg connection blip during cancel must not strand the schedule.
    // Worst case we end up with two created jobs and the
    // handler-level recent-run dedupe drops the duplicate fire.
    dbExecuteMock.mockRejectedValueOnce(new Error("connection reset"));
    const result = await scheduleReminderFire(fakeBoss, REMINDER_ID, FIRE_AT);
    expect(bossSendMock).toHaveBeenCalledTimes(1);
    expect(result).toBe("new-job-id");
  });

  it("returns boss.send's null when pg-boss itself rejects the send", async () => {
    // Defense check: if pg-boss returns null for any reason (queue
    // missing, future stately-style policy quirks, etc), surface that
    // up so the caller's logger captures jobId: null.
    bossSendMock.mockResolvedValueOnce(null);
    const result = await scheduleReminderFire(fakeBoss, REMINDER_ID, FIRE_AT);
    expect(result).toBeNull();
  });
});