const express = require('express');
const bodyParser = require('body-parser');
const storage = require('./modules/storage.js');
const check = require('./modules/auth.js');
const fileload = require('express-fileupload');
let routeAdd = require('./routes/add');
let routeAutos = require('./routes/autos');
let routeAuto = require('./routes/auto');
let routes = require('./routes/index');
let routerReg = require('./routes/register');
let rourtAuth = require('./routes/auth');
const cookieParser = require('cookie-parser');
const session = require('express-session');
const crypto = require('crypto');
const passport = require('passport');
const LocalStrategy = require('passport-local').Strategy;
let path = require('path');
let auth = require('basic-auth');

const app = express();
app.set('view engine', 'ejs');
app.use(express.static('public'));
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.use(fileload());
app.use(cookieParser());
app.use(session({
    secret: 'SEGReT$25_',
    resave: false,
    saveUninitialized: true
}));
app.use(passport.initialize());
app.use(passport.session());

// app.use(function (req, res, next) {
//     res.status(404);
//     // respond with json
//     if (req.accepts('json')) {
//         res.setHeader('Content-Type', 'application/json');
//         res.send(JSON.stringify({ "message": "Not found", "documentation_url": "docs/api/v1" }, null, 2));
//         return;
//     }
// });

const sendFileOpts = {
    root: path.join(__dirname, 'views')
};

app.use('/', routes);
app.use('/', routerReg);
app.use('/', rourtAuth);
app.use('/', routeAdd);
app.use('/', routeAutos);
app.use('/', routeAuto);

const serverSalt = "45%sAlT_";

function sha512(password, salt) {
    const hash = crypto.createHmac('sha512', salt);
    hash.update(password);
    const value = hash.digest('hex');
    return {
        salt: salt,
        passwordHash: value
    };
};

function basicAuth(callback, param, req, res) {
    let credentials = auth(req);
    if (credentials) {
        storage.userGetByUsername(credentials.name)
            .then(() => {
                callback(param);
            })
            .catch(() => {
                res.setHeader('Content-Type', 'application/json');
                res.send(JSON.stringify({ "message": "Invalid username or password", "documentation_url": "docs/api/v1" }, null, 2));
            });
    } else {
        res.setHeader('Content-Type', 'application/json');
        res.send(JSON.stringify({ "message": "Required auth", "documentation_url": "docs/api/v1" }, null, 2));
    }
}

app.get('/api/v1/users',
    (req, res) => {
        function getAllUsers() {
            storage.usersGetAll()
                .then(users => {
                    let outUsers = [];
                    for (let user of users)
                        outUsers.push({
                            "id": user._id,
                            "username": user.username,
                            "role": user.role,
                            "api_url": "/api/v1/users/" + user.username
                        });

                    res.setHeader('Content-Type', 'application/json');
                    res.send(JSON.stringify(outUsers, null, 2));
                })
        }
        basicAuth(getAllUsers, null, req, res);
    });

app.get('/api/v1/cars',
    (req, res) => {
        function getAllCars() {
            storage.getAll()
                .then(cars => {
                    let outCars = [];
                    for (let car of cars)
                        outCars.push({
                            "id": car._id,
                            "model": car.model,
                            "size_class": car.size_class,
                            "doors": car.doors,
                            "engine_volume": car.engine_volume,
                            "engine_type": car.engine_type,
                            "start_date": car.start_date,
                            "api_url": "/api/v1/cars/" + car._id
                        });

                    res.setHeader('Content-Type', 'application/json');
                    res.send(JSON.stringify(outCars, null, 2));
                });
        }
        basicAuth(getAllCars, null, req, res);
    });

app.post('/api/v1/cars/delete/:id',
    check.checkAdmin,
    (req, res) => {
        const id = parseInt(req.params.auto_id);
        storage.remove(id).then(() => {
            res.setHeader('Content-Type', 'application/json');
            res.send(JSON.stringify({ "message": "Object deleted", "documentation_url": "docs/api/v1" }, null, 2));
        })
    });

app.get('/api/v1/cars/:id',
    (req, res) => {

        function getCar(param) {
            storage.getById(param)
                .then(car => {
                    let outCar = {
                        "id": car._id,
                        "model": car.model,
                        "size_class": car.size_class,
                        "doors": car.doors,
                        "engine_volume": car.engine_volume,
                        "engine_type": car.engine_type,
                        "start_date": car.start_date,
                        "api_url": "/api/v1/cars/" + car._id
                    };
                    res.setHeader('Content-Type', 'application/json');
                    res.send(JSON.stringify(outCar, null, 2));
                })
                .catch(error => {
                    console.log(error);
                    res.setHeader('Content-Type', 'application/json');
                    res.send(JSON.stringify({ "message": "404 not found", "documentation_url": "docs/api/v1" }, null, 2));
                });
        }

        basicAuth(getCar, req.params.id, req, res);
    });

app.get('/api/v1/users/:username',
    (req, res) => {
        function getUser(param) {
            storage.userGetByUsername(param)
                .then(user => {
                    let outuser = {
                        "id": user._id,
                        "username": user.username,
                        "role": user.role,
                        "api_url": "/api/v1/users/" + user.username
                    };
                    res.setHeader('Content-Type', 'application/json');
                    res.send(JSON.stringify(outuser, null, 2));
                })
                .catch(error => {
                    console.log(error);
                    res.setHeader('Content-Type', 'application/json');
                    res.send(JSON.stringify({ "message": "404 not found", "documentation_url": "docs/api/v1" }, null, 2));
                });
        }
        basicAuth(getUser, req.params.username, req, res);
    });

app.get('/docs/api/v1',
    (req, res) => {
        res.sendFile('api.html', sendFileOpts);
    });

app.use(function (req, res, next) {
    res.status(404);
    // respond with json
    if (req.accepts('json')) {
        res.setHeader('Content-Type', 'application/json');
        res.send(JSON.stringify({ "message": "Not found", "documentation_url": "docs/api/v1" }, null, 2));
        return;
    }
});
app.listen(process.env.PORT || 5000);