import { test } from "node:test"
import assert from "node:assert/strict"
import { backoffDelayMs } from "./src/stats.ts"

test("first failure retries after the base delay", () => {
  assert.equal(backoffDelayMs(1), 1000)
})

test("second failure doubles the delay", () => {
  assert.equal(backoffDelayMs(2), 2000)
})

test("delay grows exponentially", () => {
  assert.equal(backoffDelayMs(3), 4000)
  assert.equal(backoffDelayMs(4), 8000)
})

test("delay is capped at the maximum", () => {
  assert.equal(backoffDelayMs(5), 10000)
  assert.equal(backoffDelayMs(10), 10000)
  assert.equal(backoffDelayMs(20), 10000)
})

test("uses provided base and max", () => {
  assert.equal(backoffDelayMs(1, 200, 5000), 200)
  assert.equal(backoffDelayMs(5, 200, 5000), 3200)
  assert.equal(backoffDelayMs(20, 200, 5000), 5000)
})