import fs from 'node:fs'
import os from 'node:os'
import path from 'node:path'

import { afterEach, expect, it } from 'vitest'

import { createCompressionStore } from './compression-settings'

const dirs: string[] = []
afterEach(() => { for (const dir of dirs.splice(0)) fs.rmSync(dir, { recursive: true, force: true }) })

it('persists complete settings and survives reopening', () => {
  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'compression-store-'))
  dirs.push(dir)
  const store = createCompressionStore(dir)
  const settings = { ...store.get(), keepTurns: 12, primaryModel: 'ide/primary', fallbackModel: 'ide/backup' }
  store.save(settings)
  expect(createCompressionStore(dir).get()).toEqual(settings)
  expect(fs.readdirSync(dir)).toEqual(['compression-settings.json'])
})

it('rejects invalid thresholds without replacing saved settings', () => {
  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'compression-store-'))
  dirs.push(dir)
  const store = createCompressionStore(dir)
  const original = store.save(store.get())
  for (const patch of [{ keepTurns: 0 }, { targetPercent: 70 }, { maxTokens: NaN }, { autoEnabled: 'yes' }]) {
    expect(() => store.save({ ...original, ...patch })).toThrow()
    expect(store.get()).toEqual(original)
  }
})