/**
 * Lightweight HTTP bridge for image generation.
 * Listens on port 3001 (POST /generate) and returns base64 slices.
 * Runs only when Node integration is available (Electron renderer).
 */

import { generateImagesBase64 } from '@/views/components/marketingEdit/generateImagesRender'

type NodeRequire = typeof require

let started = false

export function startGenerateServer() {
  if (started) return
  // 仅在具有 Node 能力（Electron 渲染进程）时启动
  const nodeRequire: NodeRequire | undefined = (window as any)?.require
  if (!nodeRequire) {
    return
  }

  const http = nodeRequire('http')

  const PORT = 3001
  started = true

  http
    .createServer(async (req: any, res: any) => {
      // 仅支持 POST /generate
      if (req.method !== 'POST' || req.url !== '/generate') {
        res.statusCode = 404
        res.end('Not Found')
        return
      }

      let body = ''
      req.on('data', (chunk: any) => {
        body += chunk
        // 简单的大小保护（50MB）
        if (body.length > 50 * 1024 * 1024) {
          res.statusCode = 413
          res.end('Payload Too Large')
          req.destroy()
        }
      })

      req.on('end', async () => {
        res.setHeader('Content-Type', 'application/json')
        try {
          const payload = body ? JSON.parse(body) : {}
          const canvasList = payload.canvasList || []
          const goodsList = payload.goodsList || []
          const { images, plans } = await generateImagesBase64(canvasList, goodsList)
          res.end(JSON.stringify({ code: 0, images, plans }))
        } catch (e: any) {
          res.statusCode = 500
          res.end(JSON.stringify({ code: 1, msg: e?.message || 'generate failed' }))
        }
      })
    })
    .listen(PORT, () => {
      console.log(`[generateServer] listening on http://localhost:${PORT}/generate`)
    })
}

// 自动启动（在 Electron 渲染进程）
if (typeof window !== 'undefined') {
  try {
    startGenerateServer()
  } catch (e) {
    console.warn('[generateServer] start failed', e)
  }
}