#!/usr/bin/env python3

# Licensed to the Apache Software Foundation (ASF) under one
# 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.
from __future__ import annotations

import os
import shlex
import shutil
import subprocess
import sys
from pathlib import Path

if __name__ not in ("__main__", "__mp_main__"):
    raise SystemExit(
        "This file is intended to be executed as an executable program. You cannot use it as a module."
        f"To run this script, run the ./{__file__} command"
    )


def clean_up_airflow_home(airflow_home: Path):
    if airflow_home.exists():
        print(f"Removing {airflow_home}")
        shutil.rmtree(airflow_home, ignore_errors=True)


def check_if_in_virtualenv() -> bool:
    return hasattr(sys, "real_prefix") or (hasattr(sys, "base_prefix") and sys.base_prefix != sys.prefix)


def check_for_package_extras() -> str:
    """
    check if the user provided any extra packages to install.
    defaults to package 'devel'.
    """
    if len(sys.argv) > 1:
        if len(sys.argv) > 2:
            print('Provide extras as 1 argument like: "devel,google,snowflake"')
            sys.exit(1)
        return sys.argv[1]
    return "devel"


def pip_install_requirements() -> int:
    """
    install the requirements of the current python version.
    return 0 if success, anything else is an error.
    """

    extras = check_for_package_extras()
    print(
        f"""
Installing requirements.

Airflow is installed with "{extras}" extra.

----------------------------------------------------------------------------------------

IMPORTANT NOTE ABOUT EXTRAS !!!

You can specify extras as single coma-separated parameter to install. For example

* devel - to have all development dependencies required to test core.
* devel-* - to selectively install tools that we use to run scripts, tests, static checks etc.
* google,amazon,microsoft_azure - to install dependencies needed at runtime by specified providers
* devel-all-dbs - to have all development dependencies required for all DB providers
* devel-all - to have all development dependencies required for all providers

Note that "devel-all" installs all possible dependencies and we have > 600 of them,
which might not be possible to install cleanly on your host because of lack of
system packages. It's easier to install extras one-by-one as needed.

----------------------------------------------------------------------------------------

"""
    )
    version = get_python_version()
    constraint = (
        f"https://raw.githubusercontent.com/apache/airflow/constraints-main/"
        f"constraints-source-providers-{version}.txt"
    )
    pip_install_command = ["pip", "install", "-e", f".[{extras}]", "--constraint", constraint]
    quoted_command = " ".join([shlex.quote(parameter) for parameter in pip_install_command])
    print()
    print(f"Running command: \n   {quoted_command}\n")
    e = subprocess.run(pip_install_command)
    return e.returncode


def get_python_version() -> str:
    """
    return the version of python we are running.
    """
    major = sys.version_info[0]
    minor = sys.version_info[1]
    return f"{major}.{minor}"


def main():
    """
    Setup local virtual environment.
    """
    airflow_home_dir = Path(os.environ.get("AIRFLOW_HOME", Path.home() / "airflow"))
    airflow_sources = Path(__file__).resolve().parents[2]

    if not check_if_in_virtualenv():
        print(
            "Local virtual environment not activated.\nPlease create and activate it "
            "first. (for example using 'python3 -m venv venv && source venv/bin/activate')"
        )
        sys.exit(1)

    print("Initializing environment...")
    print(f"This will remove the folder {airflow_home_dir} and reset all the databases!")
    response = input("Are you sure? (y/N/q)")
    if response != "y":
        sys.exit(2)

    print(f"\nWiping and recreating {airflow_home_dir}")

    if airflow_home_dir == airflow_sources:
        print("AIRFLOW_HOME and Source code are in the same path")
        print(
            f"When running this script it will delete all files in path {airflow_home_dir} "
            "to clear dynamic files like config/logs/db"
        )
        print("Please move the airflow source code elsewhere to avoid deletion")

        sys.exit(3)

    clean_up_airflow_home(airflow_home_dir)

    return_code = pip_install_requirements()

    if return_code != 0:
        print(
            "To solve persisting issues with the installation, you might need the "
            "prerequisites installed on your system.\n "
            "Try running the command below and rerun virtualenv installation\n"
        )

        os_type = sys.platform
        if os_type == "darwin":
            print("brew install sqlite mysql postgresql openssl")
            print('export LDFLAGS="-L/usr/local/opt/openssl/lib"')
            print('export CPPFLAGS="-I/usr/local/opt/openssl/include"')
        else:
            print(
                "sudo apt install build-essential python3-dev libsqlite3-dev openssl "
                "sqlite default-libmysqlclient-dev libmysqlclient-dev postgresql"
            )
        sys.exit(4)

    print("\nResetting AIRFLOW sqlite database...")
    env = os.environ.copy()
    env["AIRFLOW__CORE__LOAD_EXAMPLES"] = "False"
    env["AIRFLOW__CORE__UNIT_TEST_MODE"] = "False"
    env["AIRFLOW__DATABASE__SQL_ALCHEMY_POOL_ENABLED"] = "False"
    env["AIRFLOW__CORE__DAGS_FOLDER"] = f"{airflow_sources}/empty"
    env["AIRFLOW__CORE__PLUGINS_FOLDER"] = f"{airflow_sources}/empty"
    subprocess.run(["airflow", "db", "reset", "--yes"], env=env)

    print("\nResetting AIRFLOW sqlite unit test database...")
    env = os.environ.copy()
    env["AIRFLOW__CORE__LOAD_EXAMPLES"] = "True"
    env["AIRFLOW__CORE__UNIT_TEST_MODE"] = "False"
    env["AIRFLOW__DATABASE__SQL_ALCHEMY_POOL_ENABLED"] = "False"
    env["AIRFLOW__CORE__DAGS_FOLDER"] = f"{airflow_sources}/empty"
    env["AIRFLOW__CORE__PLUGINS_FOLDER"] = f"{airflow_sources}/empty"
    subprocess.run(["airflow", "db", "reset", "--yes"], env=env)

    print("\nInitialization of environment complete! Go ahead and develop Airflow!")


if __name__ == "__main__":
    main()