from __future__ import annotations

from typing import Dict, List

from .contracts import Signal


class Aggregator:
    @staticmethod
    def aggregate_signals(signals: List[Signal]) -> Dict[str, float]:
        # Simple cross-venue aggregation: average of numeric metrics where possible
        sums: Dict[str, float] = {}
        counts: Dict[str, int] = {}
        for s in signals:
            for k, v in s.metrics.items():
                try:
                    val = float(v)
                except (TypeError, ValueError):
                    continue
                sums[k] = sums.get(k, 0.0) + val
                counts[k] = counts.get(k, 0) + 1
        return {k: (sums[k] / counts[k] if counts[k] else 0.0) for k in sums}