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import typing
from typing import List

from selenium.webdriver.common import service
from selenium.webdriver.common import utils

DEFAULT_EXECUTABLE_PATH = "geckodriver"


class Service(service.Service):
    """A Service class that is responsible for the starting and stopping of
    `geckodriver`.

    :param executable_path: install path of the geckodriver executable, defaults to `geckodriver`.
    :param port: Port for the service to run on, defaults to 0 where the operating system will decide.
    :param service_args: (Optional) List of args to be passed to the subprocess when launching the executable.
    :param log_path: (Optional) File path for the file to be opened and passed as the subprocess stdout/stderr handler,
        defaults to `geckodriver.log`.
    :param env: (Optional) Mapping of environment variables for the new process, defaults to `os.environ`.
    """

    def __init__(
        self,
        executable_path: str = DEFAULT_EXECUTABLE_PATH,
        port: int = 0,
        service_args: typing.Optional[typing.List[str]] = None,
        log_path: typing.Optional[str] = None,
        env: typing.Optional[typing.Mapping[str, str]] = None,
        **kwargs,
    ) -> None:
        # Todo: This is vastly inconsistent, requires a follow up to standardise.
        file = log_path or "geckodriver.log"
        log_file = open(file, "a+", encoding="utf-8")
        self.service_args = service_args or []
        super().__init__(
            executable=executable_path,
            port=port,
            log_file=log_file,
            env=env,
            **kwargs,
        )

        # Set a port for CDP
        if "--connect-existing" not in self.service_args:
            self.service_args.append("--websocket-port")
            self.service_args.append(f"{utils.free_port()}")

    def command_line_args(self) -> List[str]:
        return ["--port", f"{self.port}"] + self.service_args