app.js

// app.js
const http = require('http');
// import functions made in other files 
const Controller = require('./controllers');
const { getReqData } = require('./utils')
// if have enviornment set up then itll grap the port number 
// from enviornment, else default is 8999
const PORT = process.env.PORT || 8999;

const server = http.createServer(async (req, res) => {
    // set the request route
    if (req.url === '/api' && req.method === 'GET') {
        // response headers
        // application/json is one content type
        res.writeHead(200, {'Content-Type': 'application/json'});
        // set the response
        res.write('howdy, this is a vanilla Node.js API');
        // end the response
        res.end()
    }
    // /api/todos : GET
    else if (req.url === "/api/todos" && req.method === "GET") {
        // get the todos.
        const todos = await new Controller().getTodos();
        // set the status code, and content-type
        res.writeHead(200, { "Content-Type": "application/json" });
        // send the data
        res.end(JSON.stringify(todos));
    }

    // /api/todos/:id : GET
    else if (req.url.match(/\/api\/todos\/([0-9]+)/) && req.method === "GET") {
        try {
            // get id from url
            const id = req.url.split("/")[3];
            // get todo
            const todo = await new Controller().getTodo(id);
            // set the status code and content-type
            res.writeHead(200, { "Content-Type": "application/json" });
            // send the data
            res.end(JSON.stringify(todo));
        } catch (error) {
            // set the status code and content-type
            res.writeHead(404, { "Content-Type": "application/json" });
            // send the error
            res.end(JSON.stringify({ message: error }));
        }
    }

    // /api/todos/:id : DELETE
    else if (req.url.match(/\/api\/todos\/([0-9]+)/) && req.method === "DELETE") {
        try {
            // get the id from url
            const id = req.url.split("/")[3];
            // delete todo
            let message = await new Controller().deleteTodo(id);
            // set the status code and content-type
            res.writeHead(200, { "Content-Type": "application/json" });
            // send the message
            res.end(JSON.stringify({ message }));
        } catch (error) {
            // set the status code and content-type
            res.writeHead(404, { "Content-Type": "application/json" });
            // send the error
            res.end(JSON.stringify({ message: error }));
        }
    }

    // /api/todos/:id : UPDATE
    else if (req.url.match(/\/api\/todos\/([0-9]+)/) && req.method === "PATCH") {
        try {
            // get the id from the url
            const id = req.url.split("/")[3];
            // update todo
            let updated_todo = await new Controller().updateTodo(id);
            // set the status code and content-type
            res.writeHead(200, { "Content-Type": "application/json" });
            // send the message
            res.end(JSON.stringify(updated_todo));
        } catch (error) {
            // set the status code and content type
            res.writeHead(404, { "Content-Type": "application/json" });
            // send the error
            res.end(JSON.stringify({ message: error }));
        }
    }

    // /api/todos/ : POST
    else if (req.url === "/api/todos" && req.method === "POST") {
        // get the data sent along
        let todo_data = await getReqData(req);
        // create the todo
        let todo = await new Controller().createTodo(JSON.parse(todo_data));
        // set the status code and content-type
        res.writeHead(200, { "Content-Type": "application/json" });
        //send the todo
        res.end(JSON.stringify(todo));
    }

    // No route present
    else {
        res.writeHead(404, { "Content-Type": "application/json" });
        res.end(JSON.stringify({ message: "Route not found" }));
    }
})

server.listen(PORT, () => {
    console.log(`server started on port: ${PORT}`);
})