import sendgrid

class Email(object):

    def __init__(self, api_key):
        self.sg = sendgrid.SendGridAPIClient(apikey=api_key)
        self.from_name = 'from name'

    def send(self, to_email, from_email, subj, msg, category, time=-1):
        data = {
            "personalizations": [
                {
                    "to": [
                        {
                            "email": str(to_email)
                        }
                    ]
                }
            ],
            "content": [
                {
                    "type": "text/html",
                    "value": str(msg)
                }
            ],
            "from": {
                "email": from_email,
                "name": self.from_name
            },
            "subject": str(subj),
            "categories": [category]
        }
        data['send_at'] = int(time)
        response = self.sg.client.mail.send.post(request_body=data)