from ...messaging import RollbotMessage


class ArgConverter:
    def __init__(self, conv):
        self.conv = conv


Message = ArgConverter(lambda _, __, msg: msg)
Database = ArgConverter(lambda _, db, __: db)
Logger = ArgConverter(lambda cmd, _, __: cmd.logger)
Bot = ArgConverter(lambda cmd, _, __: cmd.bot)
ArgList = ArgConverter(lambda _, __, msg: msg.arg_list())
Subcommand = ArgConverter(lambda _, __, msg: RollbotMessage.from_subcommand(msg))


class Config(ArgConverter):
    def __init__(self, key):
        super().__init__(lambda cmd, _, __, key=key: cmd.bot.config.get(key))


class Singleton(ArgConverter):
    def __init__(self, cls):
        super().__init__(lambda _, db, msg, cls=cls: cls.get_or_create(db, msg)) 


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(lambda cmd, db, msg: msg)
        elif p in ("db", "database"):
            converters.append(lambda cmd, db, msg: db)
        elif p in ("log", "logger"):
            converters.append(lambda cmd, db, msg: cmd.logger)
        elif p in ("bot", "rollbot"):
            converters.append(lambda cmd, db, msg: cmd.bot)
        elif p in ("args", "arg_list"):
            converters.append(lambda cmd, db, msg: msg.arg_list())
        elif p in ("subc", "subcommand"):
            converters.append(lambda cmd, db, msg: RollbotMessage.from_subcommand(msg))
        elif p in ("cfg", "config"):
            converters.append(lambda cmd, db, msg: cmd.bot.config)
        elif p.startswith("cfg") or p.endswith("cfg"):
            annot = annot or p
            converters.append(lambda cmd, db, msg, key=annot: cmd.bot.config.get(key))
        elif p.startswith("data") or p.endswith("data"):
            converters.append(lambda cmd, db, msg, sing_cls=annot: sing_cls.get_or_create(db, msg))
        else:
            raise ValueError(p)
    return converters