import test from 'brittle'
import fs from 'fs'
import path from 'path'
import os from 'os'
import { getStore } from '../server/services/store.js'
import {
  toPrometheusText,
  writeSnapshotFile,
  buildSnapshot,
} from '../server/services/export.js'

test('toPrometheusText includes peardata_info and dimensions', (t) => {
  const text = toPrometheusText({
    'system.cpu': {
      ts: Date.now(),
      values: { user: 10, idle: 90 },
    },
  })
  t.ok(text.includes('peardata_info'))
  t.ok(text.includes('peardata_system_cpu'))
  t.ok(text.includes('dimension="idle"'))
  t.ok(text.includes(' 90'))
})

test('writeSnapshotFile respects PEARDATA_EXPORT_DIR', (t) => {
  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'peardata-export-'))
  const prev = process.env.PEARDATA_EXPORT_DIR
  process.env.PEARDATA_EXPORT_DIR = dir
  const snap = { ts: 1234567890, latest: {}, success: true }
  const written = writeSnapshotFile(snap)
  t.ok(written.path)
  t.ok(fs.existsSync(written.path))
  const parsed = JSON.parse(fs.readFileSync(written.path, 'utf8'))
  t.is(parsed.ts, 1234567890)
  fs.rmSync(dir, { recursive: true, force: true })
  if (prev == null) delete process.env.PEARDATA_EXPORT_DIR
  else process.env.PEARDATA_EXPORT_DIR = prev
})

test('buildSnapshot returns latest from store', (t) => {
  // ensure singleton has something
  const store = getStore()
  store.ingest([
    {
      chart: 'system.ram',
      context: 'system.ram',
      ts: Date.now(),
      values: { used: 100, free: 200, cached: 50, buffers: 10 },
    },
  ])
  const snap = buildSnapshot()
  t.ok(snap.success)
  t.ok(snap.latest['system.ram'])
  t.ok(snap.health)
})