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

import {
  calculateBackoff,
  parseRetryAfter,
  retryDelay,
  shouldRetry,
} from "../../src/adapters/http/retry-policy.ts";

describe("HTTP retry policy", () => {
  it("uses capped exponential full jitter", () => {
    expect(calculateBackoff(0, () => 0.5)).toBe(125);
    expect(calculateBackoff(8, () => 1)).toBe(2_000);
  });

  it("parses retry-after and chooses the longer bounded delay", () => {
    expect(parseRetryAfter("2", 0)).toBe(2_000);
    expect(retryDelay({ kind: "RATE_LIMITED", retryAfterMs: 500 }, 0, () => 0)).toBe(
      500,
    );
  });

  it("allows at most two retries for safe or keyed requests", () => {
    const failure = { kind: "SERVER_FAILURE" };
    expect(shouldRetry({ idempotency: "safe" }, failure, 0)).toBe(true);
    expect(shouldRetry({ idempotency: "keyed" }, failure, 1)).toBe(true);
    expect(shouldRetry({ idempotency: "safe" }, failure, 2)).toBe(false);
    expect(shouldRetry({ idempotency: "none" }, failure, 0)).toBe(false);
    expect(
      shouldRetry(
        { idempotency: "safe" },
        { kind: "SERVER_FAILURE", httpStatus: 500 },
        0,
      ),
    ).toBe(false);
  });

  it("does not automatically wait beyond 30 seconds", () => {
    expect(
      shouldRetry(
        { idempotency: "safe" },
        { kind: "RATE_LIMITED", retryAfterMs: 31_000 },
        0,
      ),
    ).toBe(false);
  });
});