import os
from pathlib import Path

import attr
import click

from ..config import Config


class KiwiCLI(click.MultiCommand):
    """Command Line Interface spread over multiple files in this directory"""

    def list_commands(self, ctx):
        """list all the commands defined by cmd_*.py files in this directory"""

        return (
            filename[4:-3]
            for filename in os.listdir(os.path.abspath(os.path.dirname(__file__)))
            if filename.startswith("cmd_") and filename.endswith(".py")
        )

    def get_command(self, ctx, name):
        """import and return a specific command"""

        try:
            mod = __import__(f"kiwi_scp.commands.cmd_{name}", None, None, ["cmd"])
        except ImportError:
            return
        return mod.cmd


@attr.s
class KiwiCTX:
    """this class is used as the commands' shared context"""

    instance: Path = attr.ib(factory=lambda: Path('.'))

    @property
    def config(self) -> Config:
        """shorthand: get the current configuration"""

        return Config.from_instance(self.instance)


pass_kiwi_ctx = click.make_pass_decorator(KiwiCTX, ensure=True)