/* Amplify Params - DO NOT EDIT
You can access the following resource attributes as environment variables from your Lambda function
const environment = process.env.ENV
const region = process.env.REGION
const authLambdauser<some_number>UserPoolId = process.env.AUTH_LAMBDAUSERSOMENUMBER_USERPOOLID

Amplify Params - DO NOT EDIT */

const express = require('express');
const bodyParser = require('body-parser');
const awsServerlessExpressMiddleware = require('aws-serverless-express/middleware');
const AWS = require('aws-sdk');

const app = express();
app.use(bodyParser.json());
app.use(awsServerlessExpressMiddleware.eventContext());

app.use(function(req, res, next) {
  res.header('Access-Control-Allow-Origin', '*');
  res.header(
    'Access-Control-Allow-Headers',
    'Origin, X-Requested-With, Content-Type, Accept'
  );
  next();
});

app.get('/items', async function(req, res) {
  try {
    const IDP_REGEX = /.*\/.*,(.*)\/(.*):CognitoSignIn:(.*)/;
    const authProvider =
      req.apiGateway.event.requestContext.identity
        .cognitoAuthenticationProvider;
    const [, , , userId] = authProvider.match(IDP_REGEX);

    const cognito = new AWS.CognitoIdentityServiceProvider();
    const listUsersResponse = await cognito
      .listUsers({
        UserPoolId: process.env.AUTH_LAMBDAUSERSOMENUMBER_USERPOOLID,
        Filter: `sub = "${userId}"`,
        Limit: 1,
      })
      .promise();
    const user = listUsersResponse.Users[0];
    res.json({ user, message: 'get call succeed!', url: req.url });
  } catch (error) {
    console.log(error);
    res.json({ error, message: 'get call failed' });
  }
});

app.listen(3000, function() {
  console.log('App started');
});

module.exports = app;