"use strict";

let express = require('express');
let app = express();

app.use(express.static(__dirname + "/static"));

app.get('/', function (request, response) {
    response.sendfile("static/index.html");
});

let users = [];

/**
 * Запрос на регистрацию
 * {"login": "Max", "password": "max123"}
 */
app.post('/api/register', function (request, response) {
    let dataString = "";

    request.on('data', (data) => {
        dataString += data;
    });

    request.on('end', () => {

        let dataObj = JSON.parse(dataString);

        // dataObj.login уже есть в массиве?
        let flag = 0;
        for (let i = 0; i < users.length; i++) {
            if (users[i].login === dataObj.login) {
                flag += 1;
            }
        }

        if (flag === 0) {
            users.push(dataObj);
            response.end("USER ADDED");
        } else {
            response.end("USER ALREADY EXISTS");
        }

        console.log("_____________");
        console.log(users);
    })
});

app.post('/api/login', function (request, response) {
    let dataString = "";

    request.on('data', (data) => {
        dataString += data;
    });

    request.on('end', () => {
        let dataObj = JSON.parse(dataString);

        // проверяем пару логин/пароль
        let flag = 0;
        for (let i = 0; i < users.length; i++) {
            if (users[i].login === dataObj.login &&
                users[i].password === dataObj.password) {
                flag += 1;
                break;
            }
        }

        // есть ли совпадение
        if (flag === 0) {
            response.end(JSON.stringify({
                status: "ERROR",
                message: "USER NOT FOUND"
            }))
        } else {
            response.end(JSON.stringify({
                status: "OK",
                authString: dataObj.login + '_' + dataObj.password
            }))
        }
    })
});

function getIndexUserByName(name) {
    for (let i = 0; i < users.length; i++) {
        if (users[i].login === name) {
            return i;
        }
    }
    return -1;
}

function getIndexUserByToken(token) {
    let userName = token.split('_')[0];
    return getIndexUserByName(userName);
}

app.post('/api/post/create', function (request, response) {
    let dataString = "";

    request.on('data', (data) => {
        dataString += data;
    });

    request.on('end', () => {
        let dataObj = JSON.parse(dataString);
        let index = getIndexUserByToken(dataObj.userAuth);

        if (index !== -1) {
            users[index].posts.push({title:'', content:''});

            response.end(JSON.stringify({
                status: "OK",
                message: "POST ADDED"
            }))
        } else {
            response.end(JSON.stringify({
                status: "ERROR",
                message: "USER NOT FOUND"
            }))
        }
    })
})

app.get('/api/post/:userstr', function(request, response) {
    let userAuth = request.params.userstr;
    let index = getIndexUserByToken(userAuth);

        if (index !== -1) {
            response.end(JSON.stringify({
                status: "OK",
                posts: users[index].posts
            }))
        } else {
            response.end(JSON.stringify({
                status: "ERROR",
                message: "USER NOT FOUND"
            }))
        }
})

// function name() {}

// function () {}
// () => {}

let port = 5000;
app.listen(port);
console.log("server work on port " + port);

// for start `node server.js`