# Copyright 2019 Novartis Institutes for BioMedical Research Inc. Licensed
# 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.

import os
import logging

cellxgene_location = os.environ.get("CELLXGENE_LOCATION")
cellxgene_data = os.environ.get("CELLXGENE_DATA")
gateway_host = os.environ.get("GATEWAY_HOST")
gateway_protocol = os.environ.get("GATEWAY_PROTOCOL")
ip = os.environ.get("GATEWAY_IP")
extra_scripts = os.environ.get("GATEWAY_EXTRA_SCRIPTS")
ttl = os.environ.get("GATEWAY_TTL")
enable_upload = os.environ.get("GATEWAY_ENABLE_UPLOAD", "").lower() in ['true', '1']

env_vars = {
    "CELLXGENE_LOCATION": cellxgene_location,
    "CELLXGENE_DATA": cellxgene_data,
    "GATEWAY_HOST": gateway_host,
    "GATEWAY_PROTOCOL": gateway_protocol,
    "GATEWAY_IP": ip,
}

optional_env_vars = {
    "GATEWAY_EXTRA_SCRIPTS": extra_scripts,
    "GATEWAY_TTL": ttl,
    "GATEWAY_ENABLE_UPLOAD": enable_upload,
}

def validate():
    if not all(env_vars.values()):
        raise ValueError(
            f"""
    Please ensure that environment variables are set correctly.
    The ones with None below are missing and need to be set.

    {env_vars}

    Set them at the terminal before running the gateway.
    An example is:

        export CELLXGENE_LOCATION=~/anaconda/envs/cellxgene-dev/bin/cellxgene
        export CELLXGENE_DATA=../cellxgene_data
        export GATEWAY_HOST=localhost:5005
        export GATEWAY_PROTOCOL=http
        export GATEWAY_IP=127.0.0.1
    """
        )
    else:
        logging.getLogger("cellxgene_gateway").info(f"Got required env: {env_vars}", )
        logging.getLogger("cellxgene_gateway").info(f"Got optional env: {optional_env_vars}")