#!/usr/bin/env python
# Copyright (C) 2022 OVH SAS
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import argparse
import os

from oio.cli.common.utils import KeyValueAction
from oio.common.logger import get_logger
from oio.event.amqp_consumer import (
    AmqpConsumerWorker,
    AmqpConsumerPool,
    RejectMessage,
    RetryLater,
)
from oio.event.beanstalk import BeanstalkError, InvalidResponse, ResponseError
from oio.event.client import EventClient


class MessageToBeanstalkd(AmqpConsumerWorker):
    """
    Read messages from RabbitMQ, forward them to Beanstalkd
    (the one configured for OpenIO's event agent).
    """

    ERR_MSG = "Failed to forward message to beanstalkd"

    def __init__(self, *args, evt_conf=None, **kwargs):
        super().__init__(*args, **kwargs)
        self.evt_client = EventClient(conf=evt_conf)
        self.tube = evt_conf.get("tube", "oio")

    def pre_run(self):
        self.evt_client.beanstalk.use(self.tube)

    def post_connect(self):
        # This queue has probably already been declared by meta2 processes,
        # but it's considered good practice to redeclare it.
        self.declare_queue()

    def process_message(self, message, properties):
        decoded = message.decode("utf-8")
        try:
            self.evt_client.beanstalk.put(decoded)
        except (InvalidResponse, ResponseError) as err:
            self.logger.warning(self.ERR_MSG + " (rejecting it): %s", err)
            raise RejectMessage from err
        except BeanstalkError as err:
            self.logger.info(
                self.ERR_MSG + " (will retry): %s",
                err,
            )
            raise RetryLater from err
        except Exception as exc:
            self.logger.exception(self.ERR_MSG)
            raise RejectMessage from exc


def make_arg_parser():
    descr = """
    Read messages from RabbitMQ, forward them to Beanstalkd.
    """
    parser = argparse.ArgumentParser(description=descr)
    parser.add_argument(
        "--dest-tube",
        default="oio",
        help="Name of the Beanstalkd tube to send messages to (default is 'oio')",
    )
    parser.add_argument(
        "--endpoint",
        default=os.environ.get(
            "OIO_RABBITMQ_ENDPOINT", "amqp://guest:guest@127.0.0.1:5672/%2F"
        ),
        help=(
            "Endpoint of the RabbitMQ server. Can be a list separated by ';' "
            "(env: OIO_RABBITMQ_ENDPOINT, "
            "default: amqp://guest:guest@127.0.0.1:5672/%%2F)"
        ),
    )
    parser.add_argument(
        "--input-queue",
        default="oio",
        help=(
            "Name of the RabbitMQ queue (and exchange) to read messages from "
            "(default is 'oio')"
        ),
    )
    parser.add_argument(
        "--input-queue-argument",
        action=KeyValueAction,
        help="Pass extra arguments during queue declaration",
    )
    parser.add_argument(
        "--namespace",
        "--ns",
        default=os.environ.get("OIO_NS", "OPENIO"),
        help="Namespace name",
    )
    parser.add_argument(
        "--verbose", "-v", action="store_true", help="More verbose output"
    )
    parser.add_argument(
        "--workers",
        type=int,
        default=0,
        help="Number of worker processes (0 is automatic)",
    )
    return parser


def main():
    args = make_arg_parser().parse_args()
    logger = get_logger(None, verbose=args.verbose)
    pool = AmqpConsumerPool(
        args.endpoint,
        args.input_queue,
        MessageToBeanstalkd,
        logger=logger,
        processes=args.workers,
        evt_conf={"namespace": args.namespace, "tube": args.dest_tube},
        queue_args=args.input_queue_argument,
    )
    pool.run()


if __name__ == "__main__":
    main()
