import { Router, Request, Response } from 'express'

const router = Router()

router.post('/', async (req: Request, res: Response) => {
  try {
    const { messages } = req.body

    if (!messages || !Array.isArray(messages)) {
      return res.status(400).json({ error: 'Messages array is required' })
    }

    const apiKey = process.env.OPENAI_API_KEY
    if (!apiKey) {
      return res.status(500).json({
        error: 'OpenAI API key not configured',
        message: 'Por favor, configure a variável OPENAI_API_KEY no arquivo .env',
      })
    }

    const response = await fetch('https://api.openai.com/v1/chat/completions', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        Authorization: `Bearer ${apiKey}`,
      },
      body: JSON.stringify({
        model: 'gpt-4o-mini',
        messages: messages,
        temperature: 0.7,
        max_tokens: 1000,
      }),
    })

    if (!response.ok) {
      const errorData = await response.json().catch(() => ({}))
      return res.status(response.status).json({
        error: 'OpenAI API error',
        details: errorData,
      })
    }

    const data = await response.json() as {
      choices?: Array<{ message?: { content?: string } }>
    }
    const message = data.choices?.[0]?.message?.content || 'Sem resposta'

    res.json({ message })
  } catch (error) {
    console.error('Chat error:', error)
    res.status(500).json({
      error: 'Failed to process chat request',
      message: error instanceof Error ? error.message : 'Unknown error',
    })
  }
})

export default router