const net = require('net');
const fs = require('fs');

const server = net.createServer((socket) => {
    let buffer = "";
    let parsedRequest = new Map();

    socket.on('data', function(data){
        buffer += data;

        if(isDataEnd(buffer)){
            parsedRequest = parseDataToMap(buffer);
            console.log(parsedRequest);

            let requestLine = getRequestLine(buffer);
            console.log(requestLine);
        }
    });


    socket.on('error', (err) => {
        // handle errors here
        throw err;})

});



server.listen(process.env.PORT || 3000);

function isDataEnd(data) {
    return data.endsWith('\r\n\r\n');
}

function parseDataToMap(data) {
    let dataMap = new Map();
    data.split('\r\n').forEach((element, index) => {
        if (index !== 0 && element !== '') {
        let keyVal = element.split(':',2);
        dataMap.set(keyVal[0], keyVal[1]);
        }
    });

    return dataMap;
}

function getRequestLine(buffer) {
    return buffer.toString().split(' ', 3)[1];;
}

function responseFile (fileName, response) {
    const filePath =  "/path/to/archive.rar" // or any file format

    fs.exists(filePath, function(exists){
        if (exists) {
            response.writeHead(200, {
                "Content-Type": "application/octet-stream",
                "Content-Disposition": "attachment; filename=" + fileName
            });
            fs.createReadStream(filePath).pipe(response);
        } else {
            response.writeHead(400, {"Content-Type": "text/plain"});
            response.end("ERROR File does not exist");
        }
    });
}