import { test } from 'node:test'
import assert from 'node:assert/strict'

import { backoffDelay, transientReason } from '../src/retry.mjs'

test('transientReason matches connection resets and network errors', () => {
  assert.ok(transientReason('Error: Connection reset by server'))
  assert.ok(transientReason('read ECONNRESET'))
  assert.ok(transientReason('socket hang up'))
  assert.ok(transientReason('fetch failed'))
  assert.ok(transientReason('HTTP status 503 Service Unavailable'))
  assert.ok(transientReason('429 Too Many Requests'))
  assert.ok(transientReason('The request timed out'))
})

test('transientReason ignores ordinary failures', () => {
  assert.equal(transientReason('goal file not found'), null)
  assert.equal(transientReason('AssertionError: expected 1 to equal 2'), null)
  assert.equal(transientReason(''), null)
  assert.equal(transientReason(undefined, null), null)
})

test('transientReason scans several fields and returns the first match', () => {
  assert.ok(transientReason(null, 'stderr: ECONNRESET while streaming'))
})

test('backoffDelay doubles and caps', () => {
  assert.equal(backoffDelay(1, { base: 1000, jitter: false }), 1000)
  assert.equal(backoffDelay(2, { base: 1000, jitter: false }), 2000)
  assert.equal(backoffDelay(3, { base: 1000, jitter: false }), 4000)
  assert.equal(backoffDelay(10, { base: 1000, max: 5000, jitter: false }), 5000)
})

test('backoffDelay jitter stays within half..full', () => {
  assert.equal(backoffDelay(2, { base: 1000, jitter: true, random: () => 0 }), 1000)
  assert.equal(backoffDelay(2, { base: 1000, jitter: true, random: () => 1 }), 2000)
})