todoController.js

let todos = require("./data");

const findAll = () => {
	return new Promise((resolve, reject) => {
		resolve(todos);
	});
};

const findById = (id) => {
	return new Promise((resolve, reject) => {
		const todo = todos.find((todo) => todo.id === id);
		if (todo) {
			resolve(todo);
		} else {
			reject(`Todo with id${id} not found!`);
		}
	});
};

const deleteById = (id) => {
	return new Promise((resolve, reject) => {
		const newTodos = todos.filter((todo) => todo.id !== id);
		todos = [...newTodos];
		resolve({ message: "Todo deleted successfully!!" });
	});
};

const create = (todo) => {
	return new Promise((resolve, reject) => {
		const newTodo = {
			id: Date.now().toString(),
			...todo,
		};
		todos = [newTodo, ...todos];
		resolve(newTodo);
	});
};

const updateById = async (id, body) => {
	try {
		const { title, description } = body;
		const todo = await findById(id);
		if (!todo) {
			res.writeHead(404, { "Content-Type": "application/json" });
			res.end(JSON.stringify({ message: "Todo not found!" }));
		}
		return new Promise((resolve, reject) => {
			const updatedTodo = {
				id,
				title: title ? title : todo.title,
				description: description ? description : todo.description,
			};
			const index = todos.findIndex((todo) => todo.id === id);
			todos[index] = updatedTodo;
			resolve(updatedTodo);
		});
	} catch (error) {
		console.log(error);
	}
};

module.exports = {
	findAll,
	findById,
	deleteById,
	create,
	updateById,
};