from dataclasses import asdict

from fastapi import APIRouter, HTTPException
from typing import Any, Dict, List

from app.config.benchmarks import EEG_BENCHMARKS

router = APIRouter()

# Fields that are internal implementation details, not exposed via API
_INTERNAL_FIELDS = {"accuracy_field"}


def _benchmark_to_dict(key: str, benchmark) -> Dict[str, Any]:
    """Convert a BenchmarkInfo dataclass to a JSON-serializable dict."""
    d = asdict(benchmark)
    for field in _INTERNAL_FIELDS:
        d.pop(field, None)
    d["key"] = key
    return d


@router.get("")
async def list_benchmarks() -> List[Dict[str, Any]]:
    """Return all registered EEG benchmarks with metadata."""
    return [_benchmark_to_dict(k, b) for k, b in EEG_BENCHMARKS.items()]


@router.get("/{key}")
async def get_benchmark(key: str) -> Dict[str, Any]:
    """Return a single benchmark's details by key."""
    benchmark = EEG_BENCHMARKS.get(key)
    if not benchmark:
        raise HTTPException(
            status_code=404,
            detail=f"Benchmark '{key}' not found. Available: {list(EEG_BENCHMARKS.keys())}",
        )
    return _benchmark_to_dict(key, benchmark)