const express = require("express");
const cors = require('cors');
const mongoose = require('mongoose');

const dotenv = require('dotenv');

if(process.env.NODE_ENV) {
  dotenv.config({
    path: `.env.${process.env.NODE_ENV}`
  });
} else {
  dotenv.config();
}

const app = express();
const connectDB = require("./db");

// connect database
connectDB();

app.use(cors({
  origin: 'http://localhost:3000',
  credentials: true, // if using cookies/auth
}));

app.get("/api/test", (req, res) => {
  console.log("Hey");
  res.json({"message": "Hello from backend!"});
});

app.get("/api/status", (req, res) => {
  const mem = process.memoryUsage();
  const uptime = Math.floor(process.uptime());
  const hours = Math.floor(uptime / 3600);
  const minutes = Math.floor((uptime % 3600) / 60);
  
  mongoose.connection.readyState === 1
    ? res.json({
        status: "online",
        uptime: `${hours}h ${minutes}m`,
        memory: {
          rss: `${(mem.rss / 1024 / 1024).toFixed(1)} MB`,
          heapUsed: `${(mem.heapUsed / 1024 / 1024).toFixed(1)} MB`,
        },
        mongo: "connected",
      })
    : res.json({
        status: "online",
        uptime: `${hours}h ${minutes}m`,
        memory: {
          rss: `${(mem.rss / 1024 / 1024).toFixed(1)} MB`,
          heapUsed: `${(mem.heapUsed / 1024 / 1024).toFixed(1)} MB`,
        },
        mongo: "disconnected",
      });
});

app.listen(5000, () => {
  console.log("Server running on port 5000");
});