# Documented in https://zulip.readthedocs.io/en/latest/subsystems/queuing.html
import base64
import email.parser
import email.policy
import logging
from collections.abc import Mapping
from email.message import EmailMessage
from typing import Any

from typing_extensions import override

from zerver.lib.email_mirror import process_message as mirror_email
from zerver.worker.base import QueueProcessingWorker, WorkerTimeoutError, assign_queue

logger = logging.getLogger(__name__)


@assign_queue("email_mirror")
class MirrorWorker(QueueProcessingWorker):
    MAX_CONSUME_SECONDS = 5

    @override
    def consume(self, event: Mapping[str, Any]) -> None:
        rcpt_to = event["rcpt_to"]
        content = base64.b64decode(event["msg_base64"])
        msg = email.parser.BytesParser(_class=EmailMessage, policy=email.policy.default).parsebytes(
            content
        )
        try:
            mirror_email(msg, rcpt_to=rcpt_to)
        except WorkerTimeoutError:  # nocoverage
            logging.error(
                "Timed out ingesting message-id %s to %s (%d bytes) -- dropping!",
                msg["Message-ID"] or "<?>",
                rcpt_to,
                len(content),
            )
            return