const express = require('express');
const helmet = require('helmet');
const mongoose = require('mongoose');
const Player = require('./models/player');
const app = express();
const mongoDB = 'playerDB';
const ALL_PLAYERS_HREF = "http://localhost:3000/api/players/"
var api = express.Router();

mongoose.connect('mongodb://localhost/WWWProgramming', { useNewUrlParser: true });
const db = mongoose.connection
db.on('error', console.error.bind(console, 'MongoDB connection error:'));
db.once('open', () => console.log('connected to database'));

app.use(helmet());
app.use(express.json());

//The API style I use is based on what the teacher used and https://docs.microsoft.com/en-us/azure/architecture/best-practices/api-design

//Here's some example data. Further tips on how to use the API, consult the info.txt file.
players = {
    "_links": {
        "self": { "href": ALL_PLAYERS_HREF }
    },
    "_embedded": {
        "users": [{
            "_links": {
                "self": {
                    "href": "http://localhost:3000/api/players/0"
                }
            },
            "name": "Selanne",
            "active": false
        },
        {
            "_links": {
                "self": {
                    "href": "http://localhost:3000/api/players/1"
                }
            },
            "name": "Granlund",
            "active": true
        }
        ]
    }
}

function err(statusCode, response, message) {
    response.statusCode = statusCode;
    response.statusMessage = message;
    response.end();
}

api.get('/players/:id', function (req, res) {
    var player = JSON.parse(JSON.stringify(players._embedded.users.find(item => item.id == req.params.id)));
    player._links =
    {
        "self": {
            "href": ALL_PLAYERS_HREF + player.id
        },
        "players": {
            "href": ALL_PLAYERS_HREF
        }
    };
    res.json(player);
})

api.get('/players', function (req, res) {
    var playerList = {
        "_links": {
            "self": {
                "href": ALL_PLAYERS_HREF
            }
        }
    };
    users = [];
    players._embedded.users.forEach((item) => {
        var player = JSON.parse(JSON.stringify(item))
        player._links = {
            "self": {
                "href": ALL_PLAYERS_HREF + player.id
            }
        };
        users.push(player);
    });
    if (users) {
        playerList._embedded = {
            "users": users
        };
    }
    console.log(playerList);
    res.json(playerList);
});

const addLink = (player, rootLink) => {
    let link = player.link;
    player = player.toObject();

    player.links = {
        self: {
            href: link
        }
    };

    if (rootLink) {
        player.links.players = {
            href: ALL_PLAYERS_HREF
        };
    }
    return player;
}

api.post('/players', async (req, res) => {
    const player = new Player({
        name: req.body.name,
        active: req.body.active
    });

    await player.save(function (err, player) {
        if (err) return res.end("error while saving player", err);
        console.log(player + player.name + " saved to players collection.");
    });

    player = addLink(player, true);
    res.json(player)
});

api.delete('/players/:id', getPlayer, async (req, res) => {
    try {
        await res.player.remove()
        res.json({ message: 'Deleted a player' })
    } catch (err) {
        res.status(500).json({ message: err.message })
    }
})

api.delete('/players', function (req, res) {

})

api.put('/players/:id', function (req, res) {

})

async function getPlayer(req, res, next) {
    try {
        player = await Player.findById(req.params.id)
        if (player == null) {
            return res.status(404).json({ message: 'Cant find player' })
        }
    } catch (err) {
        return res.status(500).json({ message: err.message })
    }
    res.player = player
    next()
}

app.use('/api', api);
app.listen(3000, () => console.log('app listening at port 3000!'))