"""
Adapter Blueprint for MercuryMesh MVP
This module provides a minimal, well-documented skeleton that teams can copy
when implementing new venue adapters. It is intentionally simple and self-contained
so it can be dropped into new repos or integrated into the existing codebase with
minimal friction.

The blueprint focuses on three responsibilities:
- Connect to a venue feed (simulated or real)
- Extract raw venue data and normalize it into a common signal format
- Emit a Signal contract compatible object that downstream components can consume

Note: This is a blueprint, not a fully-featured adapter. It lacks networking,
security, and production-grade error handling which should be added in production use.
"""
from __future__ import annotations

from dataclasses import dataclass
from typing import Dict, Any, Optional
import time


@dataclass
class LocalMarketContext:
    venue_id: str
    symbol: str
    timeframe: str


@dataclass
class MarketSignal:
    venue_id: str
    symbol: str
    timestamp: float
    features: Dict[str, float]


class AdapterBlueprint:
    """Minimal adapter blueprint.

    - venue_id: identifier for the venue this adapter connects to
    - registry: optional contract/GoC registry payload (not required for the blueprint)
    """

    def __init__(self, venue_id: str, registry: Optional[Dict[str, Any]] = None) -> None:
        self.venue_id = venue_id
        self.registry = registry or {}
        self.connected = False

    def connect(self) -> bool:
        """Simulate a connection to the venue feed.

        In a real adapter this would establish a network connection, authenticate, etc.
        For the blueprint, we simply mark as connected and return True.
        """
        # In a real implementation, add try/except and reconnection logic
        self.connected = True
        return self.connected

    def fetch_raw(self) -> Any:
        """Fetch a raw payload from the venue feed (simulated).

        Returns a simple dict that a concrete subclass would parse.
        """
        if not self.connected:
            raise RuntimeError("Adapter not connected to venue feed")
        # Simulated raw payload; in practice this would be a socket/HTTP feed, etc.
        now = time.time()
        return {
            "venue": self.venue_id,
            "symbol": "XYZ",
            "ts": now,
            "raw_features": {
                "liquidity_proxy": 0.9,
                "order_flow_intensity": 0.6,
                "volatility_proxy": 1.1,
            },
        }

    def extract_signal(self, raw: Any) -> MarketSignal:
        """Normalize and map raw payload to a MarketSignal contract."""
        venue = str(raw.get("venue", self.venue_id))
        symbol = str(raw.get("symbol", "UNKNOWN"))
        timestamp = float(raw.get("ts", time.time()))
        features = dict(raw.get("raw_features", {}))
        return MarketSignal(venue_id=venue, symbol=symbol, timestamp=timestamp, features=features)

    def emit(self, signal: MarketSignal) -> MarketSignal:
        """Hook for downstream consumers. In a real adapter this might publish to a bus."""
        # For blueprint purposes, simply return the signal to show it was produced
        return signal


if __name__ == "__main__":
    # Simple demonstration when run as a script
    adapter = AdapterBlueprint(venue_id="venue_example")
    adapter.connect()
    raw = adapter.fetch_raw()
    sig = adapter.extract_signal(raw)
    print("Blueprint adapter produced signal:", sig)