import { afterEach, expect, test } from "bun:test";
import { redisDriver } from "../src/redis.ts";

const bun = Bun as typeof Bun & { connect: (options: unknown) => Promise<unknown> };
const originalConnect = bun.connect;
afterEach(() => {
  bun.connect = originalConnect;
});

test("rediss URLs enable TLS and decode credentials", () => {
  const options: Array<Record<string, unknown>> = [];
  bun.connect = ((value: Record<string, unknown>) => {
    options.push(value);
    return new Promise(() => {});
  }) as typeof bun.connect;
  const driver = redisDriver("rediss://user:p%40ss@redis.example.com:6380/2");
  expect(options).toHaveLength(2);
  expect(options[0]).toMatchObject({ hostname: "redis.example.com", port: 6380, tls: true });
  driver.close();
});

test("rejects invalid Redis URLs before connecting", () => {
  expect(() => redisDriver("http://localhost:6379")).toThrow("redis:// or rediss://");
  expect(() => redisDriver("redis://localhost/not-a-db")).toThrow("database");
});

test("bounds writes queued while Redis is unavailable", () => {
  bun.connect = (() => new Promise(() => {})) as typeof bun.connect;
  const driver = redisDriver("redis://localhost:6379");
  for (let index = 0; index < 1000; index++) driver.publish("topic", index);
  expect(() => driver.publish("topic", "overflow")).toThrow("queue is full");
  driver.close();
});

test("validates reconnect and backpressure options", () => {
  bun.connect = (() => new Promise(() => {})) as typeof bun.connect;
  expect(() => redisDriver(undefined, { maxPending: 0 })).toThrow("maxPending");
  expect(() => redisDriver(undefined, { reconnectDelayMs: 20, reconnectMaxDelayMs: 10 })).toThrow(
    "reconnectMaxDelayMs",
  );
});

test("reconnects and replays subscriptions after a socket closes", async () => {
  const connections: Array<Record<string, any>> = [];
  bun.connect = ((options: Record<string, any>) => {
    connections.push(options);
    return Promise.resolve({});
  }) as typeof bun.connect;
  const driver = redisDriver("redis://localhost:6379", {
    reconnectDelayMs: 1,
    reconnectMaxDelayMs: 1,
  });
  expect(connections).toHaveLength(2);

  const firstWrites: string[] = [];
  connections[0].socket.open({
    write: (bytes: Uint8Array) => firstWrites.push(new TextDecoder().decode(bytes)),
    end() {},
  });
  driver.subscribe("order:*", () => {});
  expect(firstWrites.some((write) => write.includes("PSUBSCRIBE"))).toBe(true);

  connections[0].socket.close();
  await new Promise((resolve) => setTimeout(resolve, 10));
  expect(connections.length).toBeGreaterThanOrEqual(3);
  const replayed: string[] = [];
  connections[2].socket.open({
    write: (bytes: Uint8Array) => replayed.push(new TextDecoder().decode(bytes)),
    end() {},
  });
  expect(replayed.some((write) => write.includes("PSUBSCRIBE"))).toBe(true);
  driver.close();
});