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# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

"""Environment variables carried over from earlier Git platforms."""

import os

DEBUG = False

if DEBUG:
    os.environ["PATH_INFO"] = "debug"
    os.environ["GIT_PROJECT_ROOT"] = "debug"
    os.environ["GIT_COMMITTER_NAME"] = "debug"
    os.environ["GIT_COMMITTER_EMAIL"] = "debug"
    os.environ["SCRIPT_NAME"] = "debug"
    os.environ["WEB_HOST"] = "debug"
    os.environ["WRITE_LOCK"] = "debug"
    os.environ["AUTH_FILE"] = "debug"


def _repo_name():
    path = filter(None, os.environ.get("PATH_INFO", "").split("/"))
    path = filter(lambda p: p != "git-receive-pack", list(path))
    plist = list(path)
    if len(plist) != 1:
        raise ValueError("Invalid PATH_INFO: %s" % os.environ.get("PATH_INFO"))
    return plist[0].removesuffix(".git")


def getvar(key, default: str | None = None):
    """Gets an OS env var, with a fallback value of None (or whatever)"""
    return os.environ.get(key, default)


class Environment:
    def __init__(self):
        self.repo_name = _repo_name()
        self.repo_dir = os.path.join(getvar("GIT_PROJECT_ROOT"), "%s.git" % self.repo_name)
        self.committer = getvar("GIT_COMMITTER_NAME")
        self.remote_user = getvar("GIT_COMMITTER_EMAIL")
        self.script_name = getvar("SCRIPT_NAME")
        self.web_host = getvar("WEB_HOST")
        self.archived_lock = os.path.join(self.repo_dir, "nocommit")  # Lock file for archived read-only repositories
        self.write_locks = [getvar("WRITE_LOCK"), self.archived_lock]  # Global maintenance lock, plus archived locks
        self.auth_file = getvar("AUTH_FILE")
        self.ip = os.environ.get("REMOTE_ADDR", "127.0.0.1")