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import argparse
import os
import shutil

import elasticapm


def setup() -> None:
    parser = argparse.ArgumentParser(
        prog="elasticapm-run",
        description="""
        %(prog)s is a wrapper script for running python applications
        while automatically instrumenting with the Elastic APM python agent.
        """,
    )

    parser.add_argument(
        "--version", help="Print ElasticAPM version", action="version", version="%(prog)s " + elasticapm.VERSION
    )

    parser.add_argument(
        "--config",
        action="append",
        help="Config values to pass to ElasticAPM. Can be used multiple times. Ex: --config 'service_name=foo'",
    )
    parser.add_argument("app", help="Your python application")
    parser.add_argument("app_args", nargs=argparse.REMAINDER, help="Arguments for your python application", default=[])

    args = parser.parse_args()

    our_path = os.path.dirname(os.path.abspath(__file__))
    pythonpath = os.environ.get("PYTHONPATH", "").split(";")
    pythonpath = [path for path in pythonpath if path != our_path]
    pythonpath.insert(0, our_path)
    os.environ["PYTHONPATH"] = os.path.pathsep.join(pythonpath)

    for config in args.config or []:
        key, value = config.split("=", 1)
        os.environ["ELASTIC_APM_" + key.upper()] = value

    if args.app:
        app = shutil.which(args.app)
        os.execl(app, app, *args.app_args)