# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

from email.mime.application import MIMEApplication
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from pathlib import Path

import boto3
import yaml

EMAIL_FILE = Path("emails.txt")


def send_ses(
    fromaddr, subject, body, recipients, filename="", dryrun=True, email_file=None
):
    """Send an email via the Amazon SES service. Can specify a single or list of
       recipients.

       Saves emails to `emails.txt`.

    Examples:
    ```
    send_ses('me@example.com', 'greetings', "Hi!", 'you@example.com')
    ```

    ```
    send_ses('me@example.com', 'greetings', "Hi!", ['a@example.com`, 'b@example.com'])
    ```

    Raises a RuntimeError if the message did not send correctly."""

    if isinstance(recipients, list):
        recipients = ",".join(recipients)

    email_data = [
        {"from": fromaddr, "to": recipients, "subject": subject, "body": body}
    ]

    if email_file is None:
        email_file = EMAIL_FILE

    with open(email_file, "a") as f:
        f.write(yaml.dump(email_data, default_flow_style=False))

    if dryrun:
        email_txt = "\n".join(
            [
                "New Email",
                "    From: " + fromaddr,
                "    To: " + recipients,
                "    Subject: " + subject,
                "    Body: " + body,
            ]
        )
        print(email_txt)
        return

    msg = MIMEMultipart()
    msg["Subject"] = subject
    msg["From"] = fromaddr
    msg["To"] = recipients
    msg.attach(MIMEText(body))

    if filename:
        attachment = open(filename, "rb").read()
        part = MIMEApplication(attachment)
        part.add_header("Content-Disposition", "attachment", filename=filename)
        msg.attach(part)

    ses = boto3.client("ses", region_name="us-west-2")
    result = ses.send_raw_email(RawMessage={"Data": msg.as_string()})

    if "ErrorResponse" in result:
        raise RuntimeError("Error sending email: " + result)