/**
 * M4 soak: query falls back to HyperDB warm after memory miss / "restart".
 */
import test from 'brittle'
import fs from 'fs'
import path from 'path'
import { fileURLToPath } from 'url'
import { MetricStore } from '../server/services/store.js'
import { openDb, closeDb, getDb } from '../server/db/index.js'

const __dirname = path.dirname(fileURLToPath(import.meta.url))
const TMP = path.join(__dirname, '..', 'tmp-store-hyperdb-test')

test('query uses hyperdb-warm when memory is empty', async (t) => {
  fs.rmSync(TMP, { recursive: true, force: true })
  process.env.PEARDATA_DATA_DIR = TMP
  delete process.env.PEARDATA_HYPERDB

  await closeDb().catch(() => {})
  const db = await openDb()
  t.ok(db)

  const now = Date.now()
  await db.putMetricPoints([
    {
      chart: 'system.cpu',
      context: 'system.cpu',
      ts: now - 120_000,
      values: { user: 11, system: 4, nice: 0, iowait: 0, irq: 0, softirq: 0, idle: 85 },
      tier: 1,
    },
    {
      chart: 'system.cpu',
      context: 'system.cpu',
      ts: now - 60_000,
      values: { user: 22, system: 5, nice: 0, iowait: 0, irq: 0, softirq: 0, idle: 73 },
      tier: 1,
    },
  ])

  // Fresh memory store (simulates process restart with empty rings)
  const store = new MetricStore()
  const q = await store.query({
    chart: 'system.cpu',
    after: Math.floor((now - 180_000) / 1000),
    before: Math.floor(now / 1000),
    points: 60,
    tier: 1,
  })

  t.absent(q.error)
  t.is(q.source, 'hyperdb-warm')
  t.ok(q.data.length >= 2)

  await closeDb()
  // Re-open same Corestore — warm points must still be queryable
  const db2 = await openDb()
  t.ok(db2)
  t.is(getDb(), db2)
  const store2 = new MetricStore()
  const q2 = await store2.query({
    chart: 'system.cpu',
    after: Math.floor((now - 180_000) / 1000),
    before: Math.floor(now / 1000),
    points: 60,
    tier: 1,
  })
  t.is(q2.source, 'hyperdb-warm')
  t.ok(q2.data.length >= 2)

  await closeDb()
  fs.rmSync(TMP, { recursive: true, force: true })
  delete process.env.PEARDATA_DATA_DIR
})