from __future__ import annotations

from typing import TYPE_CHECKING
from typing import ClassVar

from cleo.helpers import argument
from cleo.helpers import option
from poetry.core.constraints.version.version import Version
from poetry.core.version.exceptions import InvalidVersionError

from poetry.console.commands.command import Command
from poetry.console.commands.python import get_request_title
from poetry.console.commands.python.remove import PythonRemoveCommand
from poetry.console.exceptions import PoetryRuntimeError
from poetry.utils.env.python.installer import PythonDownloadNotFoundError
from poetry.utils.env.python.installer import PythonInstallationError
from poetry.utils.env.python.installer import PythonInstaller
from poetry.utils.env.python.providers import PoetryPythonPathProvider


if TYPE_CHECKING:
    from cleo.io.inputs.argument import Argument
    from cleo.io.inputs.option import Option


class PythonInstallCommand(Command):
    name = "python install"

    arguments: ClassVar[list[Argument]] = [
        argument("python", "The python version to install.")
    ]

    options: ClassVar[list[Option]] = [
        option("clean", "c", "Clean up installation if check fails.", flag=True),
        option(
            "free-threaded", "t", "Use free-threaded version if available.", flag=True
        ),
        option(
            "implementation",
            "i",
            "Python implementation to use. (cpython, pypy)",
            flag=False,
            default="cpython",
        ),
        option(
            "reinstall", "r", "Reinstall if installation already exists.", flag=True
        ),
    ]

    description = (
        "Install the specified Python version from the Python Standalone Builds project."
        " (<warning>experimental feature</warning>)"
    )

    def handle(self) -> int:
        request = self.argument("python")
        impl = self.option("implementation").lower()
        reinstall = self.option("reinstall")
        free_threaded = self.option("free-threaded")
        if request.endswith("t"):
            free_threaded = True
            request = request[:-1]

        try:
            version = Version.parse(request)
        except (ValueError, InvalidVersionError):
            self.io.write_error_line(
                f"<error>Invalid Python version requested <b>{request}</></error>"
            )
            return 1

        if free_threaded and version < Version.parse("3.13.0"):
            self.io.write_error_line("")
            self.io.write_error_line(
                "Free threading is not supported for Python versions prior to <c1>3.13.0</>.\n\n"
                "See https://docs.python.org/3/howto/free-threading-python.html for more information."
            )
            self.io.write_error_line("")
            return 1

        installer = PythonInstaller(request, impl, free_threaded)

        try:
            if installer.exists() and not reinstall:
                self.io.write_error_line(
                    "Python version already installed at "
                    f"<b>{PoetryPythonPathProvider.installation_dir(version, impl, free_threaded)}</>.\n"
                )
                self.io.write_error_line(
                    f"Use <c1>--reinstall</> to install anyway, "
                    f"or use <c1>poetry python remove {version}</> first."
                )
                return 1
        except PythonDownloadNotFoundError:
            self.io.write_error_line(
                "No suitable standalone build found for the requested Python version."
            )
            return 1

        request_title = get_request_title(request, impl, free_threaded)

        try:
            self.io.write(f"Downloading and installing {request_title} ... ")
            installer.install()
        except PythonInstallationError as e:
            self.io.write("<fg=red>Failed</>\n")
            self.io.write_error_line("")
            self.io.write_error_line(str(e))
            self.io.write_error_line("")
            return 1

        self.io.write("<fg=green>Done</>\n")
        self.io.write(f"Testing {request_title} ... ")

        try:
            installer.exists()
        except PoetryRuntimeError as e:
            self.io.write("<fg=red>Failed</>\n")

            if installer.installation_directory.exists() and self.option("clean"):
                PythonRemoveCommand.remove_python_installation(
                    str(installer.version), impl, free_threaded, self.io
                )

            raise e

        self.io.write("<fg=green>Done</>\n")

        return 0