#!/usr/bin/env python3
"""
PORT: DataFeed
==============
Abstract interface for market data sources.

Clean Architecture Principle:
- Core business logic depends on this PORT (interface)
- Adapters implement this port
- Easy to swap: Hazelcast → Binance → In-Kernel Rust

Future Evolution:
- Current: HazelcastAdapter (DolphinNG6 feed)
- Next: BinanceWebsocketAdapter (direct)
- Future: RustKernelAdapter (in-kernel, zero-copy)
"""

from abc import ABC, abstractmethod
from dataclasses import dataclass
from typing import Dict, List, Optional, Callable, Any
from datetime import datetime


@dataclass(frozen=True)
class MarketSnapshot:
    """
    Immutable market snapshot - single source of truth.
    
    Contains BOTH price and computed features (eigenvalues, etc.)
    Guaranteed to be synchronized - same timestamp for all fields.
    """
    timestamp: datetime
    symbol: str
    
    # Price data
    price: float
    bid: Optional[float] = None
    ask: Optional[float] = None
    
    # Computed features (from DolphinNG6)
    eigenvalues: Optional[List[float]] = None
    eigenvectors: Optional[Any] = None  # Matrix
    velocity_divergence: Optional[float] = None
    irp_alignment: Optional[float] = None
    
    # Metadata
    scan_number: Optional[int] = None
    source: str = "unknown"  # "hazelcast", "binance", "kernel"
    
    def is_valid(self) -> bool:
        """Check if snapshot has required fields."""
        return self.price > 0 and self.eigenvalues is not None


@dataclass
class ACBUpdate:
    """Adaptive Circuit Breaker update."""
    timestamp: datetime
    boost: float
    beta: float
    cut: float
    posture: str


class DataFeedPort(ABC):
    """
    PORT: Abstract data feed interface.
    
    Implementations:
    - HazelcastDataFeed: Current (DolphinNG6 integration)
    - BinanceDataFeed: Direct WebSocket
    - RustKernelDataFeed: Future in-kernel implementation
    """
    
    @abstractmethod
    async def connect(self) -> bool:
        """Connect to data source."""
        pass
    
    @abstractmethod
    async def disconnect(self):
        """Clean disconnect."""
        pass
    
    @abstractmethod
    async def get_latest_snapshot(self, symbol: str) -> Optional[MarketSnapshot]:
        """
        Get latest synchronized snapshot (price + features).
        
        This is the KEY method - returns ATOMIC data.
        No sync issues possible.
        """
        pass
    
    @abstractmethod
    async def subscribe_snapshots(self, callback: Callable[[MarketSnapshot], None]):
        """
        Subscribe to snapshot stream.
        
        callback receives MarketSnapshot whenever new data arrives.
        """
        pass
    
    @abstractmethod
    async def get_acb_update(self) -> Optional[ACBUpdate]:
        """Get latest ACB (Adaptive Circuit Breaker) update."""
        pass
    
    @abstractmethod
    def get_latency_ms(self) -> float:
        """Report current data latency (for monitoring)."""
        pass
    
    @abstractmethod
    def health_check(self) -> bool:
        """Check if feed is healthy."""
        pass