app.js

const express = require("express");
const path = require("path");
const app = express();
const cors = require('cors');
require('dotenv').config();

// lambda/serverless eval for local dev express server
const awsLambda = process.env.SERVERLESS; // true or false setting
if(awsLambda === "false") {
  const morgan = require('morgan');
  const lambdaLocal = require('lambda-local')
  app.use(morgan("dev"));  
  // static middleware
  app.get("/", (req, res) => 
  res.sendFile(path.join(__dirname, ".", "public/index.html"))
  );
  app.use(express.static(path.join(__dirname, ".", "public")));
  //*index html catch path (sends all other requests to there) - not used if serverless/lambda
  
  // local-lambda testing route -> Does not work with Express-wrapped λ 
  app.use('/lambda', async (req, res) =>{
  const result = await lambdaLocal.execute({
    lambdaPath: path.join(__dirname, 'lambda.js'),
    lambdaHandler: 'handler',
    envfile: path.join(__dirname, '.env'),
    event: {
      headers: req.headers,
      body: req.body
    }
  });
  console.log('Local Lambda route initiated', result)
  res
    // .status(result.statusCode)
    .set(result.headers)
    .end(result.body)
  });
};


// middleware (parsing & local lambda/serverless dev)

app.use(express.json({ limit: '25mb'}));
app.use(express.urlencoded({
  limit: '25mb',
  extended: true,
}));

// CORS setup
const port = process.env.PORT || 3000;
const allowedOrigins = [
  `http://localhost:${port}`,
  "http://localhost:3000",
  "http://localhost",
  "https://jobhunt-hq.netlify.app"
];
app.use(cors({
  origin: function(origin, callback) {
    if(!origin) return callback(null, true);
    if(allowedOrigins.indexOf(origin) === -1) {
      const msg = 'The CORS policy for this site does not' +
      'allow access from the specified Origin.';
      return callback(new Error(msg), false);
    }
    return callback(null, true);
  }
}));
  
  // api/router
  app.use("/api", require("./api"));
  

if(awsLambda === "false") {
  app.use("*", (req, res) => {
    res.sendFile(path.join(__dirname, ".", "public/index.html"));
  });
};

// error handling endware
app.use((req, res, next) => {
  const error = Error('Page Not Found.');
  error.status = 404;
  next(error);
});

app.use((err, req, res) => {
  console.log(err.stack);
  res.status(err.status || 500).send(err.message || 'Internal Server Error.');
});

  //any remaining reqs w/ an extension (.js, .css, etc...) send 404
app.use((req, res, next) => {
  if(path.extname(req.path).length) {
    const err = new Error("Not Found");
    err.status = 404;
    next(err);
  } else {
    next();
  }
});

module.exports = app;