# RhodeCode VCSServer provides access to different vcs backends via network.
# Copyright (C) 2014-2023 RhodeCode GmbH
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA

import logging
import redis

from ..lib import rc_cache
from ..lib.ext_json import json


log = logging.getLogger(__name__)

redis_client = None


class RedisTxnClient:

    def __init__(self, url):
        self.url = url
        self._create_client(url)

    def _create_client(self, url):
        connection_pool = redis.ConnectionPool.from_url(url)
        self.writer_client = redis.StrictRedis(
            connection_pool=connection_pool
        )
        self.reader_client = self.writer_client

    def set(self, key, value):
        self.writer_client.set(key, value)

    def get(self, key):
        return self.reader_client.get(key)

    def delete(self, key):
        self.writer_client.delete(key)


def get_redis_client(url=''):

    global redis_client
    if redis_client is not None:
        return redis_client
    if not url:
        from vcsserver import CONFIG
        url = CONFIG['vcs.svn.redis_conn']
    redis_client = RedisTxnClient(url)
    return redis_client


def get_txn_id_data_key(repo_path, svn_txn_id):
    log.debug('svn-txn-id: %s, obtaining data path', svn_txn_id)
    repo_key = rc_cache.utils.compute_key_from_params(repo_path)
    final_key = f'{repo_key}.{svn_txn_id}.svn_txn_id'
    log.debug('computed final key: %s', final_key)

    return final_key


def store_txn_id_data(repo_path, svn_txn_id, data_dict):
    log.debug('svn-txn-id: %s, storing data', svn_txn_id)

    if not svn_txn_id:
        log.warning('Cannot store txn_id because it is empty')
        return

    redis_conn = get_redis_client()

    store_key = get_txn_id_data_key(repo_path, svn_txn_id)
    store_data = json.dumps(data_dict)
    redis_conn.set(store_key, store_data)


def get_txn_id_from_store(repo_path, svn_txn_id, rm_on_read=False):
    """
    Reads txn_id from store and if present returns the data for callback manager
    """
    log.debug('svn-txn-id: %s, retrieving data', svn_txn_id)
    redis_conn = get_redis_client()

    store_key = get_txn_id_data_key(repo_path, svn_txn_id)
    data = {}
    redis_conn.get(store_key)
    raw_data = 'not-set'
    try:
        raw_data = redis_conn.get(store_key)
        if not raw_data:
            raise ValueError(f'Failed to get txn_id metadata, from store: {store_key}')
        data = json.loads(raw_data)
    except Exception:
        log.exception('Failed to get txn_id metadata: %s', raw_data)

    if rm_on_read:
        log.debug('Cleaning up txn_id at %s', store_key)
        redis_conn.delete(store_key)

    return data