/**
 * Grok Client
 * 與 Gemini 相同介面
 * 預設不啟用
 */

import type { AIProvider } from '~/types/ai'
import { getGrokToken, getTextModel, getVisionModel } from '~/utils/storage'
import { DEFAULT_GROK_TEXT_MODEL, DEFAULT_GROK_VISION_MODEL, getGrokModelForTask } from './grok-models'

const GROK_API_BASE = 'https://api.x.ai/v1'

/**
 * Grok API Client
 */
export class GrokClient implements AIProvider {
  /**
   * 取得 API Token
   */
  private getToken(): string {
    const token = getGrokToken()
    if (!token) {
      throw new Error('Grok API Token 未設定，請至設定頁面輸入')
    }
    return token
  }

  /**
   * 呼叫 Grok API
   * @param prompt - 文字提示
   * @param model - 模型名稱，預設使用 grok-2
   * @param parts - 多模態內容（圖像等）
   */
  private async callAPI(
    prompt: string,
    model: string = DEFAULT_GROK_TEXT_MODEL,
    parts?: Array<{ text?: string; image_url?: { url: string } }>
  ): Promise<string> {
    const token = this.getToken()
    const url = `${GROK_API_BASE}/chat/completions`

    // 組裝 messages
    const messages: Array<{ role: string; content: Array<{ type: string; text?: string; image_url?: { url: string } }> }> = []
    
    const contentParts: Array<{ type: string; text?: string; image_url?: { url: string } }> = []
    
    if (prompt) {
      contentParts.push({ type: 'text', text: prompt })
    }
    
    if (parts) {
      parts.forEach(part => {
        if (part.image_url) {
          contentParts.push({ type: 'image_url', image_url: part.image_url })
        }
      })
    }

    messages.push({
      role: 'user',
      content: contentParts
    })

    const response = await fetch(url, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${token}`
      },
      body: JSON.stringify({
        model,
        messages
      })
    })

    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()
    return data.choices?.[0]?.message?.content || ''
  }

  /**
   * 生成分鏡表
   */
  async generateStoryboard(input: unknown): Promise<string> {
    // 如果選擇的模型是 Grok 模型，使用選擇的模型；否則使用預設
    const selectedModel = getTextModel()
    const model = selectedModel && selectedModel.includes('grok') 
      ? selectedModel 
      : getGrokModelForTask('text')
    const prompt = typeof input === 'string' ? input : JSON.stringify(input)
    return this.callAPI(prompt, model)
  }

  /**
   * 分析攝影機鏡位與運鏡
   * 支援圖像輸入
   */
  async analyzeCamera(input: unknown): Promise<string> {
    // 如果選擇的模型是 Grok 模型，使用選擇的模型；否則使用預設
    const selectedModel = getVisionModel()
    const model = selectedModel && selectedModel.includes('grok')
      ? selectedModel
      : getGrokModelForTask('vision')
    
    // 如果 input 是物件且包含圖像
    if (typeof input === 'object' && input !== null) {
      const inputObj = input as { prompt?: string; image?: { url: string } }
      const prompt = inputObj.prompt || '請分析這張圖片的攝影機鏡位與運鏡建議'
      const parts: Array<{ text?: string; image_url?: { url: string } }> = []
      
      if (inputObj.image) {
        parts.push({ image_url: inputObj.image })
      }
      
      return this.callAPI(prompt, model, parts)
    }
    
    const prompt = typeof input === 'string' ? input : JSON.stringify(input)
    return this.callAPI(prompt, model)
  }

  /**
   * 生成影片規劃
   */
  async generateVideoPlan(input: unknown): Promise<string> {
    const prompt = typeof input === 'string' ? input : JSON.stringify(input)
    return this.callAPI(prompt)
  }

  /**
   * 生成剪輯建議
   */
  async generateEditSuggestion(input: unknown): Promise<string> {
    const prompt = typeof input === 'string' ? input : JSON.stringify(input)
    return this.callAPI(prompt)
  }
}