import { readFile, writeFile } from 'fs/promises'
import { paths } from './paths'
import { DEFAULT_SETTINGS, type UserSettings } from '../shared/ipc'

/** Lecture des réglages persistés (fusionnés avec les valeurs par défaut). */
export async function getSettings(): Promise<UserSettings> {
  try {
    const raw = await readFile(paths.settingsFile, 'utf-8')
    return { ...DEFAULT_SETTINGS, ...(JSON.parse(raw) as Partial<UserSettings>) }
  } catch {
    return { ...DEFAULT_SETTINGS }
  }
}

/** Écriture des réglages (validés/clampés). */
export async function setSettings(next: UserSettings): Promise<UserSettings> {
  const clean: UserSettings = {
    maxMemoryMb: Math.max(2048, Math.min(32768, Math.round(next.maxMemoryMb || DEFAULT_SETTINGS.maxMemoryMb))),
    extraJvmArgs: Array.isArray(next.extraJvmArgs) ? next.extraJvmArgs : []
  }
  await writeFile(paths.settingsFile, JSON.stringify(clean, null, 2))
  return clean
}