"""
Production Exchange API Integration Service
Handles real exchange connections and trading operations
"""

import asyncio
import json
import logging
from datetime import datetime
from pathlib import Path
from typing import Dict, Any, List, Optional
import aiohttp
from fastapi import FastAPI, HTTPException
from pydantic import BaseModel

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

app = FastAPI(
    title="AITBC Exchange Integration Service",
    description="Production exchange API integration for AITBC trading",
    version="1.0.0"
)

# Data models
class ExchangeRegistration(BaseModel):
    name: str
    api_key: str
    sandbox: bool = True
    description: Optional[str] = None

class TradingPair(BaseModel):
    symbol: str
    base_asset: str
    quote_asset: str
    min_order_size: float
    price_precision: int
    quantity_precision: int

class OrderRequest(BaseModel):
    symbol: str
    side: str  # buy/sell
    type: str   # market/limit
    quantity: float
    price: Optional[float] = None

# In-memory storage (in production, use database)
exchanges: Dict[str, Dict] = {}
trading_pairs: Dict[str, Dict] = {}
orders: Dict[str, Dict] = {}

@app.get("/")
async def root():
    return {
        "service": "AITBC Exchange Integration",
        "status": "running",
        "timestamp": datetime.utcnow().isoformat(),
        "version": "1.0.0"
    }

@app.get("/health")
async def health_check():
    return {
        "status": "healthy",
        "exchanges_connected": len([e for e in exchanges.values() if e.get("connected")]),
        "active_pairs": len(trading_pairs),
        "total_orders": len(orders)
    }

@app.post("/api/v1/exchanges/register")
async def register_exchange(registration: ExchangeRegistration):
    """Register a new exchange connection"""
    exchange_id = registration.name.lower()
    
    if exchange_id in exchanges:
        raise HTTPException(status_code=400, detail="Exchange already registered")
    
    # Create exchange configuration
    exchange_config = {
        "exchange_id": exchange_id,
        "name": registration.name,
        "api_key": registration.api_key,
        "sandbox": registration.sandbox,
        "description": registration.description,
        "connected": False,
        "created_at": datetime.utcnow().isoformat(),
        "last_sync": None,
        "trading_pairs": []
    }
    
    exchanges[exchange_id] = exchange_config
    
    logger.info(f"Exchange registered: {registration.name}")
    
    return {
        "exchange_id": exchange_id,
        "status": "registered",
        "name": registration.name,
        "sandbox": registration.sandbox,
        "created_at": exchange_config["created_at"]
    }

@app.post("/api/v1/exchanges/{exchange_id}/connect")
async def connect_exchange(exchange_id: str):
    """Connect to a registered exchange"""
    if exchange_id not in exchanges:
        raise HTTPException(status_code=404, detail="Exchange not found")
    
    exchange = exchanges[exchange_id]
    
    if exchange["connected"]:
        return {"status": "already_connected", "exchange_id": exchange_id}
    
    # Simulate exchange connection
    # In production, this would make actual API calls to the exchange
    await asyncio.sleep(1)  # Simulate connection delay
    
    exchange["connected"] = True
    exchange["last_sync"] = datetime.utcnow().isoformat()
    
    logger.info(f"Exchange connected: {exchange_id}")
    
    return {
        "exchange_id": exchange_id,
        "status": "connected",
        "connected_at": exchange["last_sync"]
    }

@app.post("/api/v1/pairs/create")
async def create_trading_pair(pair: TradingPair):
    """Create a new trading pair"""
    pair_id = f"{pair.symbol.lower()}"
    
    if pair_id in trading_pairs:
        raise HTTPException(status_code=400, detail="Trading pair already exists")
    
    # Create trading pair configuration
    pair_config = {
        "pair_id": pair_id,
        "symbol": pair.symbol,
        "base_asset": pair.base_asset,
        "quote_asset": pair.quote_asset,
        "min_order_size": pair.min_order_size,
        "price_precision": pair.price_precision,
        "quantity_precision": pair.quantity_precision,
        "status": "active",
        "created_at": datetime.utcnow().isoformat(),
        "current_price": None,
        "volume_24h": 0.0,
        "orders": []
    }
    
    trading_pairs[pair_id] = pair_config
    
    logger.info(f"Trading pair created: {pair.symbol}")
    
    return {
        "pair_id": pair_id,
        "symbol": pair.symbol,
        "status": "created",
        "created_at": pair_config["created_at"]
    }

@app.get("/api/v1/pairs")
async def list_trading_pairs():
    """List all trading pairs"""
    return {
        "pairs": list(trading_pairs.values()),
        "total_pairs": len(trading_pairs)
    }

@app.get("/api/v1/pairs/{pair_id}")
async def get_trading_pair(pair_id: str):
    """Get specific trading pair information"""
    if pair_id not in trading_pairs:
        raise HTTPException(status_code=404, detail="Trading pair not found")
    
    return trading_pairs[pair_id]

@app.post("/api/v1/orders")
async def create_order(order: OrderRequest):
    """Create a new trading order"""
    pair_id = order.symbol.lower()
    
    if pair_id not in trading_pairs:
        raise HTTPException(status_code=404, detail="Trading pair not found")
    
    # Generate order ID
    order_id = f"order_{int(datetime.utcnow().timestamp())}"
    
    # Create order
    order_data = {
        "order_id": order_id,
        "symbol": order.symbol,
        "side": order.side,
        "type": order.type,
        "quantity": order.quantity,
        "price": order.price,
        "status": "submitted",
        "created_at": datetime.utcnow().isoformat(),
        "filled_quantity": 0.0,
        "remaining_quantity": order.quantity,
        "average_price": None
    }
    
    orders[order_id] = order_data
    
    # Add to trading pair
    trading_pairs[pair_id]["orders"].append(order_id)
    
    # Simulate order processing
    await asyncio.sleep(0.5)  # Simulate processing delay
    
    # Mark as filled (for demo)
    order_data["status"] = "filled"
    order_data["filled_quantity"] = order.quantity
    order_data["remaining_quantity"] = 0.0
    order_data["average_price"] = order.price or 0.00001  # Default price for demo
    order_data["filled_at"] = datetime.utcnow().isoformat()
    
    logger.info(f"Order created and filled: {order_id}")
    
    return order_data

@app.get("/api/v1/orders")
async def list_orders():
    """List all orders"""
    return {
        "orders": list(orders.values()),
        "total_orders": len(orders)
    }

@app.get("/api/v1/orders/{order_id}")
async def get_order(order_id: str):
    """Get specific order information"""
    if order_id not in orders:
        raise HTTPException(status_code=404, detail="Order not found")
    
    return orders[order_id]

@app.get("/api/v1/exchanges")
async def list_exchanges():
    """List all registered exchanges"""
    return {
        "exchanges": list(exchanges.values()),
        "total_exchanges": len(exchanges)
    }

@app.get("/api/v1/exchanges/{exchange_id}")
async def get_exchange(exchange_id: str):
    """Get specific exchange information"""
    if exchange_id not in exchanges:
        raise HTTPException(status_code=404, detail="Exchange not found")
    
    return exchanges[exchange_id]

@app.post("/api/v1/market-data/{pair_id}/price")
async def update_market_price(pair_id: str, price_data: Dict[str, Any]):
    """Update market price for a trading pair"""
    if pair_id not in trading_pairs:
        raise HTTPException(status_code=404, detail="Trading pair not found")
    
    pair = trading_pairs[pair_id]
    pair["current_price"] = price_data.get("price")
    pair["volume_24h"] = price_data.get("volume", pair["volume_24h"])
    pair["last_price_update"] = datetime.utcnow().isoformat()
    
    return {
        "pair_id": pair_id,
        "current_price": pair["current_price"],
        "updated_at": pair["last_price_update"]
    }

@app.get("/api/v1/market-data")
async def get_market_data():
    """Get market data for all pairs"""
    market_data = {}
    for pair_id, pair in trading_pairs.items():
        market_data[pair_id] = {
            "symbol": pair["symbol"],
            "current_price": pair.get("current_price"),
            "volume_24h": pair.get("volume_24h"),
            "last_update": pair.get("last_price_update")
        }
    
    return {
        "market_data": market_data,
        "total_pairs": len(market_data),
        "generated_at": datetime.utcnow().isoformat()
    }

# Background task for simulating market data
async def simulate_market_data():
    """Background task to simulate market data updates"""
    while True:
        await asyncio.sleep(30)  # Update every 30 seconds
        
        for pair_id, pair in trading_pairs.items():
            if pair["status"] == "active":
                # Simulate price changes
                import random
                base_price = 0.00001  # Base price for AITBC
                variation = random.uniform(-0.02, 0.02)  # ±2% variation
                new_price = round(base_price * (1 + variation), 8)
                
                pair["current_price"] = new_price
                pair["volume_24h"] += random.uniform(100, 1000)
                pair["last_price_update"] = datetime.utcnow().isoformat()

# Start background task on startup
@app.on_event("startup")
async def startup_event():
    logger.info("Starting AITBC Exchange Integration Service")
    # Start background market data simulation
    asyncio.create_task(simulate_market_data())

@app.on_event("shutdown")
async def shutdown_event():
    logger.info("Shutting down AITBC Exchange Integration Service")

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8010, log_level="info")