import logging
import inspect

from ...messaging import RollbotResponse, RollbotFailure, RollbotFailureException
from ..base import RollbotPlugin


def get_converters(parameters, annotations):
    converters = []
    for p in parameters:
        annot = annotations.get(p, None)
        if isinstance(annot, ArgConverter):
            converters.append(annot.conv)
        elif p in ("msg", "message", "_msg"):
            converters.append(Message.conv)
        elif p in ("db", "database"):
            converters.append(Database.conv)
        elif p in ("log", "logger"):
            converters.append(Logger.conv)
        elif p in ("bot", "rollbot"):
            converters.append(Bot.conv)
        elif p in ("args", "arg_list"):
            converters.append(ArgList.conv)
        elif p in ("subc", "subcommand"):
            converters.append(Subcommand.conv)
        elif p in ("cfg", "config"):
            converters.append(Config())
        elif p.startswith("cfg") or p.endswith("cfg"):
            converters.append(Config(annot or p).conv)
        elif p.startswith("data") or p.endswith("data"):
            converters.append(Singleton(annot).conv)
        else:
            raise ValueError(p)
    return converters


def as_plugin(command):
    if isinstance(command, str):
        command_name = command
    else:
        command_name = command.__name__

    def init_standin(self, bot, logger=logging.getLogger(__name__)):
        RollbotPlugin.__init__(self, command_name, bot, logger=logger)

    def decorator(fn):
        sig = inspect.signature(fn)
        try:
            converters = get_converters(sig.parameters, fn.__annotations__)
        except ValueError as ve:
            raise ValueError(f"Illegal argument name {str(ve)} in decorated plugin {command_name}")

        def on_command_standin(self, db, msg):
            try:
                res = fn(*[c(self, db, msg) for c in converters])
            except RollbotFailureException as rfe:
                res = rfe.failure
            if res is None:
                return RollbotResponse(msg, respond=False)
            elif isinstance(res, RollbotResponse):
                return res
            elif isinstance(res, RollbotFailure):
                return RollbotResponse(msg, failure=res, debugging=res.get_debugging())
            else:
                return RollbotResponse(msg, txt=str(res))

        return type(
            f"AutoGenerated`{command_name}`Command",
            (RollbotPlugin,),
            dict(
                __init__=init_standin,
                on_command=on_command_standin,
            )
        )

    if isinstance(command, str):
        return decorator
    else:
        return decorator(command)