from datetime import datetime
from flask_mail import Message
from sqlalchemy import desc

from crc import app, db, mail, session
from crc.api.common import ApiError

from crc.models.study import StudyModel
from crc.models.email import EmailModel


class EmailService(object):
    """Provides common tools for working with an Email"""

    @staticmethod
    def add_email(subject, sender, recipients, content, content_html, study_id=None):
        """We will receive all data related to an email and store it"""

        # Find corresponding study - if any
        study = None
        if type(study_id) == int:
            study = db.session.query(StudyModel).get(study_id)

        # Create EmailModel
        email_model = EmailModel(subject=subject, sender=sender, recipients=str(recipients),
                                 content=content, content_html=content_html, study=study)

        # Send mail
        try:
            msg = Message(subject,
                  sender=sender,
                  recipients=recipients)

            msg.body = content
            msg.html = content_html

            mail.send(msg)
        except Exception as e:
            app.logger.error('An exception happened in EmailService', exc_info=True)
            app.logger.error(str(e))

        db.session.add(email_model)
        db.session.commit()