"""
Simple Redis manager stub.
"""

import logging
from typing import Any, Optional, List, Dict

logger = logging.getLogger(__name__)


class RedisManager:
    """Simple Redis manager stub"""
    
    def __init__(self):
        self.connected = False
        self.cache = {}  # In-memory cache as fallback
        self.stats = {
            'hits': 0,
            'misses': 0,
            'sets': 0,
            'deletes': 0
        }
        
    async def connect(self):
        """Connect to Redis (stub)"""
        logger.info("Redis manager initialized (stub mode)")
        self.connected = True
        
    async def initialize(self):
        """Initialize Redis manager"""
        await self.connect()
        
    async def disconnect(self):
        """Disconnect from Redis"""
        self.connected = False
        
    async def close(self):
        """Close Redis connection (alias for disconnect)"""
        await self.disconnect()
        
    def is_connected(self) -> bool:
        """Check if connected"""
        return self.connected
        
    async def ping(self) -> bool:
        """Ping Redis to check connection"""
        return self.connected
        
    async def set(self, key: str, value: Any, ttl: Optional[int] = None):
        """Set value in cache"""
        self.cache[key] = value
        self.stats['sets'] += 1
        logger.debug(f"Cached key: {key}")
        
    async def get(self, key: str) -> Optional[Any]:
        """Get value from cache"""
        value = self.cache.get(key)
        if value is not None:
            self.stats['hits'] += 1
        else:
            self.stats['misses'] += 1
        return value
        
    async def delete(self, key: str):
        """Delete key from cache"""
        self.cache.pop(key, None)
        self.stats['deletes'] += 1
        
    async def keys(self, pattern: str) -> List[str]:
        """Get keys matching pattern"""
        if pattern.endswith('*'):
            prefix = pattern[:-1]
            return [key for key in self.cache.keys() if key.startswith(prefix)]
        return [key for key in self.cache.keys() if key == pattern]
    
    async def get_heatmap(self, symbol: str, exchange: Optional[str] = None) -> Optional[Any]:
        """Get heatmap data for symbol"""
        key = f"heatmap:{symbol}:{exchange or 'consolidated'}"
        return await self.get(key)
    
    async def get_orderbook(self, symbol: str, exchange: str) -> Optional[Any]:
        """Get order book data for symbol on exchange"""
        key = f"orderbook:{symbol}:{exchange}"
        return await self.get(key)
    
    async def get_metrics(self, symbol: str, exchange: str) -> Optional[Any]:
        """Get metrics data for symbol on exchange"""
        key = f"metrics:{symbol}:{exchange}"
        return await self.get(key)
    
    async def get_exchange_status(self, exchange: str) -> Optional[Any]:
        """Get exchange status"""
        key = f"st:{exchange}"
        return await self.get(key)
    
    def get_stats(self) -> Dict[str, Any]:
        """Get cache statistics"""
        total_requests = self.stats['hits'] + self.stats['misses']
        hit_rate = self.stats['hits'] / max(1, total_requests)
        
        return {
            'hits': self.stats['hits'],
            'misses': self.stats['misses'],
            'sets': self.stats['sets'],
            'deletes': self.stats['deletes'],
            'hit_rate': hit_rate,
            'total_keys': len(self.cache),
            'connected': self.connected
        }
    
    async def health_check(self) -> Dict[str, Any]:
        """Get Redis health status"""
        return {
            'connected': self.connected,
            'total_keys': len(self.cache),
            'memory_usage': 'N/A (stub mode)',
            'uptime': 'N/A (stub mode)'
        }


# Global instance
redis_manager = RedisManager()