import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
import fs from 'node:fs'
import path from 'node:path'
import type { IncomingMessage, ServerResponse } from 'node:http'

const DATA_FILE = path.resolve('./data.json')

function readData(): Record<string, unknown> {
  if (!fs.existsSync(DATA_FILE)) return {}
  try {
    return JSON.parse(fs.readFileSync(DATA_FILE, 'utf-8'))
  } catch {
    return {}
  }
}

function readBody(req: IncomingMessage): Promise<string> {
  return new Promise((resolve) => {
    let body = ''
    req.on('data', (chunk: Buffer) => { body += chunk.toString() })
    req.on('end', () => resolve(body))
  })
}

export default defineConfig({
  plugins: [
    react(),
    {
      name: 'data-api',
      configureServer(server) {
        server.middlewares.use('/api/data', async (req: IncomingMessage, res: ServerResponse) => {
          res.setHeader('Content-Type', 'application/json')

          if (req.method === 'GET') {
            const data = readData()
            res.end(JSON.stringify(data))

          } else if (req.method === 'POST') {
            const body = await readBody(req)
            const incoming = JSON.parse(body) as { key: string; value: unknown }
            const data = readData()
            data[incoming.key] = incoming.value
            fs.writeFileSync(DATA_FILE, JSON.stringify(data))
            res.end('{"ok":true}')

          } else if (req.method === 'DELETE') {
            const key = new URL(req.url ?? '', 'http://x').searchParams.get('key')
            if (key) {
              const data = readData()
              delete data[key]
              fs.writeFileSync(DATA_FILE, JSON.stringify(data))
            }
            res.end('{"ok":true}')

          } else {
            res.statusCode = 405
            res.end('{"error":"Method Not Allowed"}')
          }
        })
      },
    },
  ],
  server: {
    host: true, // ローカルネットワーク全体に公開
  },
})