"""
Creates different AI instances, based on the given configuration.
"""

import argparse
from typing import cast
from .configuration import Config, OpenAIConfig, default_ai_ID
from .ai import AI, AIError
from .ais.openai_cmm import OpenAI


def create_ai(args: argparse.Namespace, config: Config) -> AI:
    """
    Creates an AI subclass instance from the given args and configuration.
    """
    if args.ai:
        ai_conf = config.ais[args.ai]
    elif default_ai_ID in config.ais:
        ai_conf = config.ais[default_ai_ID]
    else:
        raise AIError("No AI name given and no default exists")

    if ai_conf.name == 'openai':
        return OpenAI(cast(OpenAIConfig, ai_conf))
    else:
        raise AIError(f"AI '{args.ai}' is not supported")