index.js

require("dotenv").config();

const express = require("express");
const cors = require("cors");
const morgan = require("morgan");
const fs = require("fs");
const path = require("path");
const app = express();
const PORT = process.env.PORT || 3000;

const userRouter = require("./routes/user.js");
const productRouter = require("./routes/product.js");
const adminRouter = require("./routes/admin.js");
const chartRouter = require("./routes/chart.js");

const { CustomError } = require("./helpers/errorHandler.js");

const accessLogStream = fs.createWriteStream(
  path.join(__dirname, "access.log"),
  { flags: "a" }
);

const errorLogStream = fs.createWriteStream(path.join(__dirname, "error.log"), {
  flags: "a",
});

// Log all errors to error.log
app.use(
  morgan("combined", {
    stream: errorLogStream,
    skip: function (req, res) {
      return res.statusCode < 400;
    },
  })
);
app.use(
  morgan("common", {
    stream: accessLogStream,
    skip: function (req, res) {
      return res.statusCode >= 400;
    },
  })
);
app.use(cors());
app.use(express.json());

app.use("/api/user", userRouter);
app.use("/api/product", productRouter);
app.use("/api/admin", adminRouter);
app.use("/api/chart", chartRouter);

app.use((req, res, next) => {
  return res.status(404).send({ error: "API Route not found" });
});

app.use((err, req, res, next) => {
  console.error(err.stack);
  res.setHeader("Content-Type", "application/json");
  if (err instanceof CustomError && err.errorArray) {
    return res.status(err.statusCode).send({ errors: err.errorArray });
  }
  if (err instanceof CustomError) {
    return res.status(err.statusCode).send({ error: err.message });
  }

  return res.status(400).send({ err: err.message });
});

app.listen(PORT, () => {
  console.log("Application listening on port: " + PORT);
});