/**
 * 列出可用的 Gemini 模型
 * 呼叫 Google API 取得實際可用的模型列表
 */

import { getGeminiToken } from '~/utils/storage'

const GEMINI_API_BASE = 'https://generativelanguage.googleapis.com/v1'

/**
 * 取得所有可用的模型列表
 */
export async function listAvailableModels(): Promise<Array<{
  name: string
  displayName: string
  description: string
  supportedGenerationMethods: string[]
}>> {
  const token = getGeminiToken()
  if (!token) {
    throw new Error('Gemini API Token 未設定，請至設定頁面輸入')
  }

  const url = `${GEMINI_API_BASE}/models?key=${token}`

  try {
    const response = await fetch(url)
    
    if (!response.ok) {
      const error = await response.json().catch(() => ({ error: { message: 'Unknown error' } }))
      throw new Error(error.error?.message || `API 錯誤: ${response.status}`)
    }

    const data = await response.json()
    
    // 過濾出支援 generateContent 的模型
    const models = (data.models || [])
      .filter((model: any) => 
        model.supportedGenerationMethods?.includes('generateContent')
      )
      .map((model: any) => ({
        name: model.name.replace('models/', ''),
        displayName: model.displayName || model.name,
        description: model.description || '',
        supportedGenerationMethods: model.supportedGenerationMethods || []
      }))

    return models
  } catch (error) {
    console.error('取得模型列表失敗:', error)
    throw error
  }
}