var express = require('express');
var router = express.Router();
var debug = require('debug')('Icarus:server');

var mongoClient = require('mongodb').MongoClient;
var ObjectID = require('mongodb').ObjectID;

var assert = assert = require('assert');

// Connection URL
var mongoUrl = 'mongodb://icarus:icarus@localhost:27017/icarus';

//Use connect method to test the connection to the Server
var mongoDb;
mongoClient.connect(mongoUrl, function(err, db) {

    assert.equal(null, err, err);
    debug("Connected to MongoDB database: "+db.databaseName);

    mongoDb = db;

});

router.get('/:resource_id', function(req, res, next) {

    mongoClient.connect(mongoUrl, function(err, db) {

        if(err!=null){

            debug(err);
            next(err);

        }else{

            var collection = db.collection('resources');

            var _id = new ObjectID(req.params.resource_id);
            collection.find({"_id":_id}).limit(1).next(function(err, doc){

                if(err!=null){

                    debug(err);
                    next(err);

                }else{

                    if(doc==undefined){

                        res.sendStatus(404);

                    }else{

                        res.send(doc);

                    }

                }

            });

        }

    });

});

router.post('/', function(req, res, next){

    mongoClient.connect(mongoUrl, function(err, db) {

        if(err!=null){

            debug(err);
            next(err);

        }else{

            var collection = db.collection('resources');
            var resource = req.body;

            if(Object.keys(resource).length>0) {

                collection.insertOne(resource, function (err, r) {

                    if (err != null) {

                        debug(err);
                        next(err);

                    } else {

                        res.statusCode = 201;
                        res.send({"_id":r.insertedId});

                    }

                });

            }else{

                var error = new Error("You can't store an empty resource!");
                error.status = 400;

                debug(error);
                next(error);

            }

        }

    });

});

module.exports = router;