index.js

const express = require("express");
const cors = require("cors");
const morgan = require("morgan");
const { catQueue, theCats, dogQueue, theDogs, helpers } = require("./queue");
const { PORT, CLIENT_ORIGIN } = require("./config");
const { dbConnect } = require("./db-mongoose");
// const {dbConnect} = require('./db-knex');

const app = express();

app.use(cors({
    origin: CLIENT_ORIGIN
  }));

app.use(
  morgan(process.env.NODE_ENV === "production" ? "common" : "dev", {
    skip: (req, res) => process.env.NODE_ENV === "test"
  })
);

const startQueue = (queue, data) => {
  data.forEach(animal => queue.inqueue(animal));
  return queue;
};


app.get("/api/cat", (req, res) => {
  startQueue(catQueue, theCats);

  const message = "Sorry, no cats up for adoption.";
  if (helpers.peek(catQueue)) {
    return res.json(catQueue.first.data);
  }

  else {
    res.json({ message });
  }
});

app.get("/api/dog", (req, res) => {
  startQueue(dogQueue, theDogs);

  const message = "Sorry, no dogs up for adoption.";
  if (helpers.peek(dogQueue)) {
    return res.json(dogQueue.first.data);
  }

  else {
    res.json({ message });
  }
});

app.delete("/api/cat", (req, res) => {
  catQueue.remove();
  res.status(204).end();
});

app.delete("/api/dog", (req, res) => {
  dogQueue.remove();
  res.status(204).end();
});


function runServer(port = PORT) {
  const server = app
    .listen(port, () => {
      console.info(`App listening on port ${server.address().port}`);
    })
    .on("error", err => {
      console.error("Express failed to start");
      console.error(err);
    });
}

if (require.main === module) {
  dbConnect();
  runServer();
}

module.exports = { app };