import * as fs from 'fs'
import { NextConfig } from 'next'
import { findPagesDir } from 'next/dist/lib/find-pages-dir.js'
import * as path from 'path'
import { settleSync } from '../../shared/utils/async.utils'
import { LoadedUnbodyConfig } from '../types'

const routeHandler = ({ config }: { config: LoadedUnbodyConfig }) =>
  `
import { Server } from 'unbody-nextra-service/build/server'

const server = new Server({
  apiKey: process.env.${config.env.apiKey} || "",
  projectId: process.env.${config.env.projectId} || "",
  sourceId: process.env.${config.env.sourceId} || "",
  assistant: {
    name: "${config.assistant.name}" || "Assistant",
  }
})

const handler = server.handler

export default handler
`.slice(1)

export const setupApi = ({
  config,
  nextConfig,
}: {
  nextConfig: NextConfig
  config: LoadedUnbodyConfig
}) => {
  if (!config.setupApi) return

  const { pagesDir } = findPagesDir(config.projectDir)
  const apiRoute = path.join(pagesDir!, 'api/search.ts')

  settleSync(() => fs.mkdirSync(path.dirname(apiRoute), { recursive: true }))
  fs.writeFileSync(apiRoute, routeHandler({ config }))
}