"""Dynamic plugin loader for strategy modules."""

import importlib.util
import sys
from pathlib import Path

import yaml

from strategies.base import BaseStrategy


def load_strategies(strategies_dir: Path) -> list[BaseStrategy]:
    """Scan strategies_dir for *.py files and load all BaseStrategy subclasses."""
    loaded: list[BaseStrategy] = []
    config_dir = strategies_dir / "config"

    for path in sorted(strategies_dir.glob("*.py")):
        # Skip dunder files and base
        if path.name.startswith("__") or path.name == "base.py":
            continue

        module_name = f"_strategy_plugin_{path.stem}"
        spec = importlib.util.spec_from_file_location(module_name, path)
        if spec is None or spec.loader is None:
            continue

        module = importlib.util.module_from_spec(spec)
        sys.modules[module_name] = module
        spec.loader.exec_module(module)

        for attr_name in dir(module):
            obj = getattr(module, attr_name)
            if isinstance(obj, type) and issubclass(obj, BaseStrategy) and obj is not BaseStrategy:
                instance = obj()
                yaml_path = config_dir / f"{path.stem}.yaml"
                if yaml_path.exists():
                    with open(yaml_path) as f:
                        params = yaml.safe_load(f)
                    if params:
                        instance.configure(params)
                loaded.append(instance)

    return loaded