"""Import dinamico delle classi Strategy da scripts/strategies/."""
from __future__ import annotations

import importlib
import sys
from pathlib import Path

from src.strategies.base import Strategy

PROJECT_ROOT = Path(__file__).resolve().parents[2]
STRATEGIES_DIR = PROJECT_ROOT / "scripts" / "strategies"

_REGISTRY: dict[str, type[Strategy]] = {}

# Solo strategie con edge netto validato out-of-sample (fee-aware).
# La famiglia squeeze-breakout (SQ/MT/ML/AD/CM/PD) e' stata spostata in
# scripts/waste/: l'edge storico era un artefatto di look-ahead
# (vedi scripts/analysis/oos_validation.py).
MODULE_MAP = {
    "MR01_bollinger_fade": ("MR01_bollinger_fade", "BollingerFade"),
    "MR02_donchian_fade": ("MR02_donchian_fade", "DonchianFade"),
    "MR03_keltner_fade": ("MR03_keltner_fade", "KeltnerFade"),
    "MR07_return_reversal": ("MR07_return_reversal", "ReturnReversal"),
}


def load_strategy(name: str) -> Strategy:
    """Carica e istanzia una Strategy per nome."""
    if name in _REGISTRY:
        return _REGISTRY[name]()

    if name not in MODULE_MAP:
        raise ValueError(f"Strategia sconosciuta: {name}. Disponibili: {list(MODULE_MAP)}")

    module_file, class_name = MODULE_MAP[name]
    module_path = STRATEGIES_DIR / f"{module_file}.py"

    if not module_path.exists():
        raise FileNotFoundError(f"File strategia non trovato: {module_path}")

    if str(PROJECT_ROOT) not in sys.path:
        sys.path.insert(0, str(PROJECT_ROOT))

    spec = importlib.util.spec_from_file_location(f"strategies.{module_file}", module_path)
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)

    cls = getattr(module, class_name)
    _REGISTRY[name] = cls
    return cls()


def list_available() -> list[str]:
    return list(MODULE_MAP.keys())