from dataclasses import dataclass
from typing import Any, Generic, TypeVar

from .types import CommandConfiguration, Message, Response, Context

# TODO logging


RawMsg = TypeVar('RawMsg')
@dataclass
class Rollbot(Generic[RawMsg]):
    command_config: CommandConfiguration
    database_file: str

    def read_config(self, key: str) -> Any:
        raise NotImplemented("Must be implemented by driver")

    def parse(self, incoming: RawMsg) -> Message:
        raise NotImplemented("Must be implemented by driver")

    async def respond(self, response: Response):
        raise NotImplemented("Must be implemented by driver")

    async def on_message(self, incoming: RawMsg):
        message = self.parse(incoming)
        if message.text is None:
            return

        cleaned = message.text.lstrip()
        if len(cleaned) == 0 or cleaned[0] not in self.command_config.bangs:
            return

        parts = cleaned[1:].lstrip().split(maxsplit=1)
        if len(parts) == 0:
            return

        command = self.command_config.aliases.get(parts[0], parts[0])
        res = self.command_config.call_and_response.get(command, None)
        if res is not None:
            await self.respond(Response.from_message(message, res))
            return

        command_call = self.command_config.commands.get(command, None)
        if command is None:
            await self.respond(Response.from_message(message, f"Sorry! I don't know the command {command}."))
            return

        await command_call(Context(
            message=message,
            config=self.read_config,
            respond=self.respond,
            # database=..., # TODO database
        ))