BookCollection.findOne(newBookCollection, function(err, collection){
    if (err) {
        next(err);
    } else {
        if (collection) {
            collection.update({
                $inc: {
                    quantity: 1
                }
            }, function(err){
                if (err) {
                    next(err);
                } else {
                    Book.findOne({
                        isbn: collection.isbn
                    }, function(err, book){
                        res.json({
                            result: 1,
                            bookInfo: book
                        });
                    });
                }
            });
        } else {
            Book.findOne({
                isbn: isbn
            }, function(err, book){
                if (err) {
                    next(err);
                } else {
                    //Book not exist
                    if (!book) {
                        var googleBookApiUrl = provider.google.book + isbn + "&key=" + authKey.google.apiKey;

                        httpsRequest.get(googleBookApiUrl, function(err, data){
                            if (err) {
                                next(err);
                            } else {
                                if (data.totalItems > 0) {
                                    var volumeInfo = data.items[0].volumeInfo;
                                    var newBook = {};
                                    //Need to fix missing thumbnail
                                    var imageLinks = {};

                                    //Filter incoming result
                                    if (volumeInfo.hasOwnProperty('imageLinks')) {
                                        imageLinks = volumeInfo.imageLinks;
                                    } else {
                                        imageLinks = {
                                            smallThumbnail: "https://lh4.googleusercontent.com/-by3TNG1Dhtw/AAAAAAAAAAI/AAAAAAAAAN0/gOuqGurlI8o/photo.jpg?sz=64",
                                            thumbnail: "https://lh4.googleusercontent.com/-by3TNG1Dhtw/AAAAAAAAAAI/AAAAAAAAAN0/gOuqGurlI8o/photo.jpg?sz=64"
                                        };
                                    }

                                    newBook = {
                                        isbn: isbn,
                                        title: volumeInfo.title,
                                        subtitle: volumeInfo.subtitle,
                                        author: volumeInfo.authors,
                                        description: volumeInfo.description,
                                        contentVersion: volumeInfo.contentVersion,
                                        pageNumber: volumeInfo.pageCount,
                                        publisher: volumeInfo.publisher,
                                        publishDate: volumeInfo.publishedDate,
                                        categories: volumeInfo.categories,
                                        language: volumeInfo.language,
                                        printType: volumeInfo.printType,
                                        thumbnail: imageLinks
                                    };

                                    Book.create(newBook, function(err, book){
                                        if (err) {
                                            next(err);
                                        } else {
                                            BookCollection.create(newBookCollection, function(err){
                                                if (err) {
                                                    next(err);
                                                } else {
                                                    res.json({
                                                        result: 1,
                                                        bookInfo: book
                                                    });
                                                }
                                            });
                                        }
                                    });
                                } else {
                                    res.json({
                                        result: 0,
                                        err: 'Unknown ISBN code',
                                        bookInfo: null
                                    });
                                }
                            }
                        });
                    } else {
                        BookCollection.create(newBookCollection, function(err){
                            if (err) {
                                next(err);
                            } else {
                                res.json({
                                    result: 1,
                                    bookInfo: book
                                });
                            }
                        });
                    }
                }
            });
        }
    }
});