import inspect
import os
import platform
import shlex
import sys
from collections.abc import Callable
from pathlib import Path

here = Path(__file__).parent

if platform.system() == "Windows":
    import mslex  # type:ignore[import]

    shlex = mslex  # noqa


class Command:
    def __call__(self, bin_dir, args) -> None: ...


def command(func) -> Callable:
    func.__is_command__ = True
    return func


def run(*args) -> None:
    cmd = " ".join(shlex.quote(str(part)) for part in args)
    print(f"Running '{cmd}'")
    ret = os.system(cmd)
    if ret != 0:
        sys.exit(1)


class App:
    def __init__(self):
        self.commands = {}

        compare = inspect.signature(type("C", (Command,), {})().__call__)

        for name in dir(self):
            val = getattr(self, name)
            if getattr(val, "__is_command__", False):
                assert (
                    inspect.signature(val) == compare
                ), f"Expected '{name}' to have correct signature, have {inspect.signature(val)} instead of {compare}"
                self.commands[name] = val

    def __call__(self, args) -> None:
        bin_dir = Path(sys.executable).parent

        if args and args[0] in self.commands:
            os.chdir(here.parent)
            self.commands[args[0]](bin_dir, args[1:])
            return

        sys.exit(f"Unknown command:\nAvailable: {sorted(self.commands)}\nWanted: {args}")

    @command
    def format(self, bin_dir, args) -> None:
        if not args:
            args = [".", *args]
        run(bin_dir / "black", *args)
        run(bin_dir / "isort", *args)

    @command
    def lint(self, bin_dir, args) -> None:
        run(bin_dir / "pylama", *args)

    @command
    def tests(self, bin_dir, args) -> None:
        if "-q" not in args:
            args = ["-q", *args]

        env = os.environ
        env["NOSE_OF_YETI_BLACK_COMPAT"] = "false"

        files = []
        if "TESTS_CHDIR" in env:
            ags = []
            test_dir = Path(env["TESTS_CHDIR"]).absolute()
            for a in args:
                test_name = ""
                if "::" in a:
                    filename, test_name = a.split("::", 1)
                else:
                    filename = a
                try:
                    p = Path(filename).absolute()
                except:
                    ags.append(a)
                else:
                    if p.exists():
                        rel = p.relative_to(test_dir)
                        if test_name:
                            files.append(f"{rel}::{test_name}")
                        else:
                            files.append(str(rel))
                    else:
                        ags.append(a)
            args = ags
            os.chdir(test_dir)

        run(bin_dir / "pytest", *files, *args)


app = App()

if __name__ == "__main__":
    app(sys.argv[1:])