import { Router } from 'express'
import { sendSuccess, sendError } from '../middleware/error.js'
import type { AuthRequest } from '../middleware/auth.js'

const router = Router()

const TTS_API_KEY = process.env.TTS_API_KEY || 'sk-ws-H.EHYXPRE.Gv4a.MEQCIDOofoXP-VBQILl0c_kspJZhSUj8fyYIZupigveHnpRrAiAsjWXuJ3dpyTBDCUF1ZLdcvLz8GJoan0ObIkCwfE06kQ'
const TTS_API_HOST = process.env.TTS_API_HOST || 'llm-znfsxsdp6uwik7ad.cn-beijing.maas.aliyuncs.com'
const TTS_URL = `https://${TTS_API_HOST}/api/v1/services/audio/tts/SpeechSynthesizer`

router.post('/', async (req: AuthRequest, res) => {
  try {
    const { text } = req.body
    if (!text || typeof text !== 'string') {
      return sendError(res, 'text is required')
    }

    if (text.length > 3000) {
      return sendError(res, 'text too long (max 3000 characters)')
    }

    const response = await fetch(TTS_URL, {
      method: 'POST',
      headers: {
        'Authorization': `Bearer ${TTS_API_KEY}`,
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        model: 'cosyvoice-v3-flash',
        input: {
          text,
          voice: 'longanyang',
          format: 'mp3',
          sample_rate: 22050,
          volume: 50,
          rate: 1.0,
        },
      }),
    })

    if (!response.ok) {
      const errText = await response.text()
      console.error('TTS API error:', response.status, errText)
      return sendError(res, `TTS API error: ${response.status}`, 502)
    }

    const result: any = await response.json()

    if (result.output?.audio?.url) {
      sendSuccess(res, { url: result.output.audio.url })
    } else {
      console.error('TTS API unexpected response:', JSON.stringify(result))
      sendError(res, 'TTS API returned no audio URL', 502)
    }
  } catch (err: any) {
    console.error('TTS route error:', err.message)
    sendError(res, err.message, 500)
  }
})

export default router