index.js

const express = require("express");
const bodyParser = require("body-parser");
const date = require(__dirname + "/views/date.js");
const mongoose = require("mongoose");
const _ = require("lodash");

const app = express();

// var items = ["Buy food", "Cook food", "Eat food"];
// var workItems = ["Code"];

app.set("view engine", "ejs");
app.use(bodyParser.urlencoded({ extended: true }));
app.use(express.static("public"));

mongoose.connect(
  "mongodb+srv://admin-praneet:sumpranu@cluster0.j0nhl.mongodb.net/todoDB",
  {
    useNewUrlParser: true,
    useUnifiedTopology: true,
  }
);

const itemSchema = mongoose.Schema({
  name: String,
});

const Item = mongoose.model("Item", itemSchema);

const item1 = new Item({
  name: "Welcome to your todo-list.",
});

const item2 = new Item({
  name: "Hit the + button to add new items.",
});

const item3 = new Item({
  name: "<-- Press this button to delete an item.",
});

const item4 = new Item({
  name: "Add a /(any list heading) after the url to start a new list.",
});

const defaultItems = [item1, item2, item3, item4];

const listSchema = {
  name: String,
  items: [itemSchema],
};

const List = mongoose.model("List", listSchema);

app.get("/", function (req, res) {
  let day = date.getDate();

  Item.find(function (err, items) {
    if (items.length === 0) {
      Item.insertMany(defaultItems, function (err) {
        if (err) console.log(err);
        else console.log("Successfully added default items.");
      });
      res.redirect("/");
    } else {
      res.render("list", { listTitle: day, newItems: items });
    }
  });
});

app.post("/", function (req, res) {
  const itemName = req.body.newTask;
  const listName = req.body.submit;

  const newItem = new Item({
    name: itemName,
  });

  if (listName == date.getDate()) {
    newItem.save();
    res.redirect("/");
  } else {
    List.findOne({ name: listName }, function (err, foundList) {
      foundList.items.push(newItem);
      foundList.save();
      res.redirect("/" + listName);
    });
  }
});

app.post("/delete", function (req, res) {
  const checkedBoxId = req.body.checkbox;
  const listName = req.body.listName;

  if (listName === date.getDate()) {
    Item.findByIdAndRemove(checkedBoxId, function (err) {
      if (err) console.log(err);
      else console.log("Successfully deleted.");
      res.redirect("/");
    });
  } else {
    List.findOneAndUpdate(
      { name: listName },
      { $pull: { items: { _id: checkedBoxId } } },
      function (err, results) {
        if (!err) {
          res.redirect("/" + listName);
        }
      }
    );
  }
});

app.get("/:customListName", function (req, res) {
  const customListName = _.capitalize(req.params.customListName);

  List.findOne({ name: customListName }, function (err, foundList) {
    if (!err) {
      if (!foundList) {
        const list = new List({
          name: customListName,
          items: defaultItems,
        });

        list.save();
        res.redirect("/" + customListName);
      } else {
        res.render("list", {
          listTitle: foundList.name,
          newItems: foundList.items,
        });
      }
    }
  });
});

app.get("/about", function (req, res) {
  res.render("about");
});

let port = process.env.PORT;
if (port == null || port == "") {
  port = 3000;
}

app.listen(port, function () {
  console.log("Port started on server 3000.");
});