/**
 * localStorage 工具函數
 * 用於管理 AI Token 和 Provider 設定
 */

const STORAGE_KEYS = {
  GEMINI_TOKEN: 'ai_token_gemini',
  GROK_TOKEN: 'ai_token_grok',
  PROVIDER: 'ai_provider',
  TEXT_MODEL: 'ai_text_model',
  VISION_MODEL: 'ai_vision_model',
  IMAGE_GENERATION_MODEL: 'ai_image_generation_model',
  TTS_MODEL: 'ai_tts_model'
} as const

/**
 * 取得 Gemini Token
 */
export function getGeminiToken(): string | null {
  if (typeof window === 'undefined') return null
  return localStorage.getItem(STORAGE_KEYS.GEMINI_TOKEN)
}

/**
 * 設定 Gemini Token
 */
export function setGeminiToken(token: string): void {
  if (typeof window === 'undefined') return
  localStorage.setItem(STORAGE_KEYS.GEMINI_TOKEN, token)
}

/**
 * 取得 Grok Token
 */
export function getGrokToken(): string | null {
  if (typeof window === 'undefined') return null
  return localStorage.getItem(STORAGE_KEYS.GROK_TOKEN)
}

/**
 * 設定 Grok Token
 */
export function setGrokToken(token: string): void {
  if (typeof window === 'undefined') return
  localStorage.setItem(STORAGE_KEYS.GROK_TOKEN, token)
}

/**
 * 取得當前 Provider
 */
export function getProvider(): 'gemini' | 'grok' {
  if (typeof window === 'undefined') return 'gemini'
  const provider = localStorage.getItem(STORAGE_KEYS.PROVIDER)
  return (provider === 'grok' ? 'grok' : 'gemini') as 'gemini' | 'grok'
}

/**
 * 設定 Provider
 */
export function setProvider(provider: 'gemini' | 'grok'): void {
  if (typeof window === 'undefined') return
  localStorage.setItem(STORAGE_KEYS.PROVIDER, provider)
}

/**
 * 取得當前 Provider 的 Token
 */
export function getCurrentProviderToken(): string | null {
  const provider = getProvider()
  return provider === 'gemini' ? getGeminiToken() : getGrokToken()
}

/**
 * 取得文字模型
 */
export function getTextModel(): string | null {
  if (typeof window === 'undefined') return null
  return localStorage.getItem(STORAGE_KEYS.TEXT_MODEL)
}

/**
 * 設定文字模型
 */
export function setTextModel(model: string): void {
  if (typeof window === 'undefined') return
  localStorage.setItem(STORAGE_KEYS.TEXT_MODEL, model)
}

/**
 * 取得視覺模型
 */
export function getVisionModel(): string | null {
  if (typeof window === 'undefined') return null
  return localStorage.getItem(STORAGE_KEYS.VISION_MODEL)
}

/**
 * 設定視覺模型
 */
export function setVisionModel(model: string): void {
  if (typeof window === 'undefined') return
  localStorage.setItem(STORAGE_KEYS.VISION_MODEL, model)
}

/**
 * 取得圖像生成模型
 */
export function getImageGenerationModel(): string | null {
  if (typeof window === 'undefined') return null
  return localStorage.getItem(STORAGE_KEYS.IMAGE_GENERATION_MODEL)
}

/**
 * 設定圖像生成模型
 */
export function setImageGenerationModel(model: string): void {
  if (typeof window === 'undefined') return
  localStorage.setItem(STORAGE_KEYS.IMAGE_GENERATION_MODEL, model)
}

/**
 * 取得 TTS 模型
 */
export function getTTSModel(): string | null {
  if (typeof window === 'undefined') return null
  return localStorage.getItem(STORAGE_KEYS.TTS_MODEL)
}

/**
 * 設定 TTS 模型
 */
export function setTTSModel(model: string): void {
  if (typeof window === 'undefined') return
  localStorage.setItem(STORAGE_KEYS.TTS_MODEL, model)
}