import test from 'brittle'
import {
  recordSample,
  getHistory,
  pruneMissing,
  clearHistory,
  maxHistoryPoints,
} from '../server/services/stats-history.js'

test('stats history ring buffer', (t) => {
  clearHistory()
  const id = 'abc'
  for (let i = 0; i < 5; i++) {
    recordSample(id, { cpu: i, memory: i * 1000 })
  }
  const h = getHistory(id, { limit: 3 })
  t.is(h.length, 3)
  t.is(h[2].cpu, 4)
  pruneMissing([])
  t.is(getHistory(id).length, 0)
})

test('stats history stores io rates and supports since filter', (t) => {
  clearHistory()
  const id = 'io1'
  const t0 = Date.now() - 10_000
  // inject samples with forced timestamps via direct map is not exported;
  // recordSample uses Date.now() — filter by since slightly in the past
  recordSample(id, {
    cpu: 1,
    memory: 100,
    memoryLimit: 1000,
    netRxRate: 10,
    netTxRate: 20,
    blkReadRate: 30,
    blkWriteRate: 40,
  })
  recordSample(id, {
    cpu: 2,
    memory: 200,
    netRxRate: 11,
    netTxRate: 21,
    blkReadRate: 31,
    blkWriteRate: 41,
  })
  const all = getHistory(id)
  t.is(all.length, 2)
  t.is(all[0].netRxRate, 10)
  t.is(all[1].blkWriteRate, 41)
  t.ok(all[0].memoryLimit === 1000 || all[0].memoryLimit === 0)

  const future = getHistory(id, { since: Date.now() + 60_000 })
  t.is(future.length, 0)

  const recent = getHistory(id, { since: t0 })
  t.is(recent.length, 2)
  t.ok(maxHistoryPoints() >= 120)
})