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const path = require('path')

function trimTrailingSlash(value) {
  return value.replace(/\/+$/, '')
}

function resolveApiBaseUrl() {
  const explicitApiUrl = process.env.NEXT_PUBLIC_API_URL?.trim()
  if (explicitApiUrl) {
    return trimTrailingSlash(explicitApiUrl)
  }

  const hfSpaceId = (process.env.NEXT_PUBLIC_HF_SPACE_ID ?? 'akagtag/deepdetection').trim()
  const [owner, space] = hfSpaceId.split('/')
  if (owner && space) {
    return `https://${owner}-${space}.hf.space`
  }

  return 'http://localhost:8000'
}

const API_BASE_URL = resolveApiBaseUrl()

/** @type {import('next').NextConfig} */
const nextConfig = {
  reactStrictMode: true,
  outputFileTracingRoot: path.join(__dirname),
  async rewrites() {
    return [
      {
        source: '/api/:path*',
        destination: `${API_BASE_URL}/:path*`,
      },
    ]
  },
}

module.exports = nextConfig