import openapiTS, { astToString } from 'openapi-typescript'
import prettier from 'prettier'
import path from 'path'
import fs from 'node:fs/promises'
import { fileURLToPath } from 'url'

const { format, resolveConfig } = prettier
/**
 * @param openapiUrl {string}
 * @param outputFilePath {string}
 * @param pathToPrettierRc {string}
 */
export async function generateApiSchema(openapiUrl, outputFilePath, pathToPrettierRc) {
  const request = new Request(openapiUrl)
  const response = await fetch(request)
  const json = await response.text()
  const ast = await openapiTS(json, {
    pathParamsAsTypes: true,
  })
  const prettierConfig = await resolveConfig(pathToPrettierRc, {
    useCache: true,
  })
  let schemaCode = astToString(ast)
  schemaCode = await format(schemaCode, { parser: 'typescript', ...prettierConfig })
  await fs.writeFile(path.join(outputFilePath), schemaCode)
}

if (fileURLToPath(import.meta.url) === process.argv[1]) {
  if (!process.env.OPENAPI_URL) throw new Error('OPENAPI_URL is not defined')
  await generateApiSchema(process.env.OPENAPI_URL, './src/app/api/schema.ts', './.prettierrc')
}