"""
Demo Configs — Auto-Discovery Module

Scans this folder for Python files that contain subclasses of BaseDemoConfig
and exposes them via getAvailableDemoConfigs().
"""

import importlib
import inspect
import logging
import pkgutil
from typing import Dict

from modules.demoConfigs.baseDemoConfig import BaseDemoConfig

logger = logging.getLogger(__name__)

_configCache: Dict[str, BaseDemoConfig] = {}


def getAvailableDemoConfigs() -> Dict[str, BaseDemoConfig]:
    """Return a dict of code -> instance for every discovered demo config."""
    if _configCache:
        return _configCache

    package = __name__
    packagePath = __path__

    for importer, moduleName, isPkg in pkgutil.iter_modules(packagePath):
        if moduleName.startswith("_"):
            continue
        try:
            module = importlib.import_module(f"{package}.{moduleName}")
            for name, obj in inspect.getmembers(module, inspect.isclass):
                if issubclass(obj, BaseDemoConfig) and obj is not BaseDemoConfig:
                    instance = obj()
                    if instance.code:
                        _configCache[instance.code] = instance
                        logger.info(f"Discovered demo config: {instance.code} ({instance.label})")
        except Exception as e:
            logger.warning(f"Failed to load demo config module '{moduleName}': {e}")

    return _configCache


def getDemoConfigByCode(code: str) -> BaseDemoConfig | None:
    """Get a specific demo config by its code."""
    configs = getAvailableDemoConfigs()
    return configs.get(code)