class SendgridService {
    constructor(config) {
        this.client = sendgrid(config.sendgrid.api_key);
    }
    send(options) {
        return new Promise((resolve, reject) => {
            this.client.send(options, function(error, result) {
                if (error) {
                    console.error("(send) Failure - Message: %j Error: %j", options, error);
                    return reject(error);
                }

                console.log("(send) Success - Message: %j Result: %j", options, result);
                return resolve(result);
            });
        });
    }
}

class EmailService {
    constructor(options, config = Config) {
        this.config   = config;
        this.provider = new Sendgrid(options, config);
    }
    send(options, record_info) {
        if (_.contains([ "sandbox", "dev" ], this.config.env.name)) {
            options.to = this.config.email.test_recipient;
            options.bcc = undefined;
            // other test related stuff
        }

        console.log("Sending email from: %s to: %s", options.from, options.to);
        return this.provider.send(options)
        .then(result => {
        	// some log/operation in case of success
            return result;
        })
        .catch(error => {
        	// some log/operation in case of error, can be fallback or retry
            return Promise.reject(error);
        });
    }
};