import type { APIGatewayEvent /*, Context*/ } from 'aws-lambda'
import { logger } from 'src/lib/logger'
import { db } from 'src/lib/db'

/**
 * The handler function is your code that processes http request events.
 * You can use return and throw to send a response or error, respectively.
 *
 * Important: When deployed, a custom serverless function is an open API endpoint and
 * is your responsibility to secure appropriately.
 *
 * @see {@link https://redwoodjs.com/docs/serverless-functions#security-considerations|Serverless Function Considerations}
 * in the RedwoodJS documentation for more information.
 *
 * @typedef { import('aws-lambda').APIGatewayEvent } APIGatewayEvent
 * @typedef { import('aws-lambda').Context } Context
 * @param { APIGatewayEvent } event - an object which contains information from the invoker.
 * @param { Context } context - contains information about the invocation,
 * function, and execution environment.
 */
export const handler = async (event: APIGatewayEvent /*context: Context*/) => {
  logger.info('Invoked checkUserName function')
  const userName = event.queryStringParameters.username
  let isUserNameAvailable = false
  try {
    const user = await db.user.findUnique({ where: { userName } })
    isUserNameAvailable = !user
  } catch (error) {
    isUserNameAvailable = false
  }
  return {
    statusCode: 200,
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      isUserNameAvailable,
    }),
  }
}