import { app } from 'electron'
import { readFile, writeFile, mkdir } from 'node:fs/promises'
import { join } from 'node:path'
import type { Settings } from '@shared/types'
import { SETTINGS_FILE, QUALITY_THRESHOLDS } from '@shared/constants'
import { DEFAULT_LANG } from '@shared/i18n'

const DEFAULTS: Settings = {
  language: DEFAULT_LANG, // 기본 한국어
  theme: 'dark', // 기본 다크모드
  onboarded: false,
  qualityThresholds: { ...QUALITY_THRESHOLDS },
  easyMode: false
}

/** 앱 설정(언어/테마/온보딩) 영속화. userData/settings.json */
class SettingsStore {
  private settings: Settings = { ...DEFAULTS }
  private loaded = false

  private filePath(): string {
    return join(app.getPath('userData'), SETTINGS_FILE)
  }

  async load(): Promise<Settings> {
    if (this.loaded) return this.settings
    try {
      const raw = await readFile(this.filePath(), 'utf-8')
      const parsed = JSON.parse(raw) as Partial<Settings>
      this.settings = { ...DEFAULTS, ...parsed }
    } catch {
      this.settings = { ...DEFAULTS }
    }
    this.loaded = true
    return this.settings
  }

  /** 동기 접근(load 이후). 메뉴 빌드 등에서 사용 */
  current(): Settings {
    return this.settings
  }

  async set(patch: Partial<Settings>): Promise<Settings> {
    await this.load()
    this.settings = { ...this.settings, ...patch }
    await mkdir(app.getPath('userData'), { recursive: true })
    await writeFile(this.filePath(), JSON.stringify(this.settings, null, 2), 'utf-8')
    return this.settings
  }
}

export const settingsStore = new SettingsStore()