# Copyright 2018 Google LLC
#
# 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.

# [START gae_python38_cloudsql_psql]
# [START gae_python3_cloudsql_psql]
import os

from flask import Flask
import psycopg2

db_user = os.environ.get("CLOUD_SQL_USERNAME")
db_password = os.environ.get("CLOUD_SQL_PASSWORD")
db_name = os.environ.get("CLOUD_SQL_DATABASE_NAME")
db_connection_name = os.environ.get("CLOUD_SQL_CONNECTION_NAME")

app = Flask(__name__)


@app.route("/")
def main():
    # When deployed to App Engine, the `GAE_ENV` environment variable will be
    # set to `standard`
    if os.environ.get("GAE_ENV") == "standard":
        # If deployed, use the local socket interface for accessing Cloud SQL
        host = f"/cloudsql/{db_connection_name}"
    else:
        # If running locally, use the TCP connections instead
        # Set up Cloud SQL Proxy (cloud.google.com/sql/docs/mysql/sql-proxy)
        # so that your application can use 127.0.0.1:3306 to connect to your
        # Cloud SQL instance
        host = "127.0.0.1"

    cnx = psycopg2.connect(
        dbname=db_name, user=db_user, password=db_password, host=host
    )
    with cnx.cursor() as cursor:
        cursor.execute("SELECT NOW() as now;")
        result = cursor.fetchall()
    current_time = result[0][0]
    cnx.commit()
    cnx.close()

    return str(current_time)


# [END gae_python3_cloudsql_psql]
# [END gae_python38_cloudsql_psql]


if __name__ == "__main__":
    app.run(host="127.0.0.1", port=8080, debug=True)