"""
Copy Trading Monitor - Tracks and copies trades from a target trader on Hyperliquid
"""

import logging
import time
import asyncio
from datetime import datetime, timedelta
from typing import Dict, List, Optional, Any
from dataclasses import dataclass
import aiohttp
import json
from decimal import Decimal, ROUND_DOWN

from ..config.config import Config
from ..clients.hyperliquid_client import HyperliquidClient
from ..notifications.notification_manager import NotificationManager
from .copy_trading_state import CopyTradingStateManager


@dataclass
class TraderPosition:
    """Represents a position held by the target trader"""
    coin: str
    size: float
    side: str  # 'long' or 'short'
    entry_price: float
    leverage: float
    position_value: float
    unrealized_pnl: float
    margin_used: float
    timestamp: int


@dataclass
class CopyTrade:
    """Represents a trade to be copied"""
    coin: str
    action: str  # 'open_long', 'open_short', 'close_long', 'close_short'
    size: float
    leverage: float
    original_trade_hash: str
    target_trader_address: str
    timestamp: int


class CopyTradingMonitor:
    """Monitor and copy trades from a target trader"""
    
    def __init__(self, client: HyperliquidClient, notification_manager: NotificationManager):
        self.client = client
        self.notification_manager = notification_manager
        self.config = Config()
        self.logger = logging.getLogger(__name__)
        
        # Configuration
        self.enabled = self.config.COPY_TRADING_ENABLED
        self.target_address = self.config.COPY_TRADING_TARGET_ADDRESS
        self.portfolio_percentage = self.config.COPY_TRADING_PORTFOLIO_PERCENTAGE
        self.copy_mode = self.config.COPY_TRADING_MODE
        self.max_leverage = self.config.COPY_TRADING_MAX_LEVERAGE
        self.min_position_size = self.config.COPY_TRADING_MIN_POSITION_SIZE
        self.execution_delay = self.config.COPY_TRADING_EXECUTION_DELAY
        self.notifications_enabled = self.config.COPY_TRADING_NOTIFICATIONS
        
        # State management for persistence and tracking
        self.state_manager = CopyTradingStateManager()
        
        # Override enabled status from state if different from config
        if self.state_manager.is_enabled() and self.target_address:
            self.enabled = True
        
        # State tracking (legacy, kept for compatibility)
        self.target_positions: Dict[str, TraderPosition] = {}
        self.our_positions: Dict[str, Any] = {}
        self.last_check_time = 0
        self.pending_trades: List[CopyTrade] = []
        
        # API endpoints
        self.info_url = "https://api.hyperliquid.xyz/info"
        
        self.logger.info(f"Copy Trading Monitor initialized - Target: {self.target_address}")
        
        # Load previous session info if available
        session_info = self.state_manager.get_session_info()
        if session_info['start_time']:
            self.logger.info(f"📅 Previous session started: {session_info['start_time']}")
            self.logger.info(f"📊 Tracked positions: {session_info['tracked_positions_count']}")
            self.logger.info(f"🔄 Copied trades: {session_info['copied_trades_count']}")
        
    async def start_monitoring(self):
        """Start the copy trading monitoring loop"""
        if not self.enabled:
            self.logger.info("Copy trading is disabled")
            return
            
        if not self.target_address:
            self.logger.error("No target trader address configured")
            return
            
        self.logger.info(f"Starting copy trading monitor for {self.target_address}")
        
        # Start state tracking
        self.state_manager.start_copy_trading(self.target_address)
        
        # Get current target positions for initialization
        current_positions = await self.get_target_positions()
        if current_positions:
            # Check if this is a fresh start or resuming
            if not self.state_manager.get_tracked_positions():
                # Fresh start - initialize tracking but don't copy existing positions
                self.logger.info("🆕 Fresh start - initializing with existing positions (won't copy)")
                self.state_manager.initialize_tracked_positions(current_positions)
                
                startup_message = (
                    f"🔄 Copy Trading Started (Fresh)\n"
                    f"Target: {self.target_address[:10]}...\n"
                    f"Portfolio Allocation: {self.portfolio_percentage:.1%}\n"
                    f"Mode: {self.copy_mode}\n"
                    f"Max Leverage: {self.max_leverage}x\n\n"
                    f"📊 Found {len(current_positions)} existing positions\n"
                    f"⚠️ Will only copy NEW trades from now on"
                )
            else:
                # Resuming - continue from where we left off
                tracked_count = len(self.state_manager.get_tracked_positions())
                self.logger.info(f"▶️ Resuming session - {tracked_count} positions tracked")
                
                startup_message = (
                    f"▶️ Copy Trading Resumed\n"
                    f"Target: {self.target_address[:10]}...\n"
                    f"Portfolio Allocation: {self.portfolio_percentage:.1%}\n"
                    f"Mode: {self.copy_mode}\n"
                    f"Max Leverage: {self.max_leverage}x\n\n"
                    f"📊 Resuming with {tracked_count} tracked positions"
                )
        else:
            startup_message = (
                f"🔄 Copy Trading Started\n"
                f"Target: {self.target_address[:10]}...\n"
                f"Portfolio Allocation: {self.portfolio_percentage:.1%}\n"
                f"Mode: {self.copy_mode}\n"
                f"Max Leverage: {self.max_leverage}x\n\n"
                f"⚠️ Could not access target trader positions"
            )
        
        # Send startup notification
        if self.notifications_enabled:
            await self.notification_manager.send_message(startup_message)
        
        # Initial sync
        await self.sync_positions()
        
        # Start monitoring loop
        while self.enabled and self.state_manager.is_enabled():
            try:
                await self.monitor_cycle()
                await asyncio.sleep(30)  # Check every 30 seconds
            except Exception as e:
                self.logger.error(f"Error in copy trading monitor cycle: {e}")
                await asyncio.sleep(60)  # Wait longer on error
    
    async def monitor_cycle(self):
        """Single monitoring cycle"""
        try:
            # Get target trader's current positions
            new_positions = await self.get_target_positions()
            
            if new_positions is None:
                return
                
            # Compare with previous positions to detect changes
            position_changes = self.detect_position_changes(new_positions)
            
            # Execute any detected trades
            for trade in position_changes:
                await self.execute_copy_trade(trade)
                
            # Update our tracking
            self.target_positions = new_positions
            
        except Exception as e:
            self.logger.error(f"Error in monitor cycle: {e}")
    
    async def get_target_positions(self) -> Optional[Dict[str, TraderPosition]]:
        """Get current positions of target trader"""
        try:
            payload = {
                "type": "clearinghouseState",
                "user": self.target_address
            }
            
            async with aiohttp.ClientSession() as session:
                async with session.post(self.info_url, json=payload) as response:
                    if response.status != 200:
                        self.logger.error(f"Failed to get target positions: {response.status}")
                        return None
                        
                    data = await response.json()
                    positions = {}
                    
                    # Parse asset positions
                    for asset_pos in data.get('assetPositions', []):
                        if asset_pos.get('type') == 'oneWay':
                            pos = asset_pos['position']
                            coin = pos['coin']
                            size = float(pos['szi'])
                            
                            if abs(size) < 0.001:  # Skip dust positions
                                continue
                                
                            side = 'long' if size > 0 else 'short'
                            
                            positions[coin] = TraderPosition(
                                coin=coin,
                                size=abs(size),
                                side=side,
                                entry_price=float(pos['entryPx']),
                                leverage=float(pos['leverage']['value']),
                                position_value=float(pos['positionValue']),
                                unrealized_pnl=float(pos['unrealizedPnl']),
                                margin_used=float(pos['marginUsed']),
                                timestamp=int(time.time() * 1000)
                            )
            
            return positions
            
        except Exception as e:
            self.logger.error(f"Error getting target positions: {e}")
            return None
    
    def detect_position_changes(self, new_positions: Dict[str, TraderPosition]) -> List[CopyTrade]:
        """Detect changes in target trader's positions using state manager"""
        trades = []
        
        # Check for new positions and position increases
        for coin, new_pos in new_positions.items():
            position_data = {
                'size': new_pos.size,
                'side': new_pos.side,
                'entry_price': new_pos.entry_price,
                'leverage': new_pos.leverage
            }
            
            # Check if this is a new position we should copy
            if self.state_manager.should_copy_position(coin, position_data):
                tracked_pos = self.state_manager.get_tracked_positions().get(coin)
                
                if tracked_pos is None:
                    # Completely new position
                    action = f"open_{new_pos.side}"
                    copy_size = new_pos.size
                    self.logger.info(f"🆕 Detected NEW position: {action} {copy_size} {coin} at {new_pos.leverage}x")
                else:
                    # Position increase
                    size_increase = new_pos.size - tracked_pos['size']
                    action = f"add_{new_pos.side}"
                    copy_size = size_increase
                    self.logger.info(f"📈 Detected position increase: {action} {size_increase} {coin}")
                
                # Create trade to copy
                trade_id = f"{coin}_{action}_{new_pos.timestamp}"
                if not self.state_manager.has_copied_trade(trade_id):
                    trades.append(CopyTrade(
                        coin=coin,
                        action=action,
                        size=copy_size,
                        leverage=new_pos.leverage,
                        original_trade_hash=trade_id,
                        target_trader_address=self.target_address,
                        timestamp=new_pos.timestamp
                    ))
                    
            # Check for position reductions
            elif self.state_manager.is_position_reduction(coin, position_data):
                tracked_pos = self.state_manager.get_tracked_positions()[coin]
                size_decrease = tracked_pos['size'] - new_pos.size
                action = f"reduce_{new_pos.side}"
                
                trade_id = f"{coin}_{action}_{new_pos.timestamp}"
                if not self.state_manager.has_copied_trade(trade_id):
                    trades.append(CopyTrade(
                        coin=coin,
                        action=action,
                        size=size_decrease,
                        leverage=new_pos.leverage,
                        original_trade_hash=trade_id,
                        target_trader_address=self.target_address,
                        timestamp=new_pos.timestamp
                    ))
                    self.logger.info(f"📉 Detected position decrease: {action} {size_decrease} {coin}")
            
            # Update tracking regardless
            self.state_manager.update_tracked_position(coin, position_data)
        
        # Check for closed positions (exits)
        tracked_positions = self.state_manager.get_tracked_positions()
        for coin in list(tracked_positions.keys()):
            if coin not in new_positions:
                # Position fully closed
                tracked_pos = tracked_positions[coin]
                action = f"close_{tracked_pos['side']}"
                
                trade_id = f"{coin}_{action}_{int(time.time() * 1000)}"
                if not self.state_manager.has_copied_trade(trade_id):
                    trades.append(CopyTrade(
                        coin=coin,
                        action=action,
                        size=tracked_pos['size'],
                        leverage=tracked_pos['leverage'],
                        original_trade_hash=trade_id,
                        target_trader_address=self.target_address,
                        timestamp=int(time.time() * 1000)
                    ))
                    self.logger.info(f"❌ Detected position closure: {action} {tracked_pos['size']} {coin}")
                
                # Remove from tracking
                self.state_manager.remove_tracked_position(coin)
        
        # Update last check time
        self.state_manager.update_last_check()
        
        return trades
    
    async def execute_copy_trade(self, trade: CopyTrade):
        """Execute a copy trade"""
        try:
            # Check if we've already copied this trade
            if self.state_manager.has_copied_trade(trade.original_trade_hash):
                self.logger.debug(f"Skipping already copied trade: {trade.original_trade_hash}")
                return
            
            # Calculate our position size
            our_size = await self.calculate_position_size(trade)
            
            if our_size < self.min_position_size:
                self.logger.info(f"Skipping {trade.coin} trade - size too small: ${our_size:.2f}")
                # Still mark as copied to avoid retrying
                self.state_manager.add_copied_trade(trade.original_trade_hash)
                return
            
            # Apply leverage limit
            leverage = min(trade.leverage, self.max_leverage)
            
            # Add execution delay
            await asyncio.sleep(self.execution_delay)
            
            # Execute the trade
            success = await self._execute_hyperliquid_trade(trade, our_size, leverage)
            
            # Mark trade as copied (whether successful or not to avoid retrying)
            self.state_manager.add_copied_trade(trade.original_trade_hash)
            
            # Send notification
            if self.notifications_enabled:
                status = "✅ SUCCESS" if success else "❌ FAILED"
                await self.notification_manager.send_message(
                    f"🔄 Copy Trade {status}\n"
                    f"Action: {trade.action}\n"
                    f"Asset: {trade.coin}\n"
                    f"Size: ${our_size:.2f}\n"
                    f"Leverage: {leverage}x\n"
                    f"Target: {trade.target_trader_address[:10]}...\n"
                    f"Trade ID: {trade.original_trade_hash[:16]}..."
                )
                
        except Exception as e:
            self.logger.error(f"Error executing copy trade for {trade.coin}: {e}")
            
            # Mark as copied even on error to avoid infinite retries
            self.state_manager.add_copied_trade(trade.original_trade_hash)
            
            if self.notifications_enabled:
                await self.notification_manager.send_message(
                    f"❌ Copy Trade Error\n"
                    f"Asset: {trade.coin}\n"
                    f"Action: {trade.action}\n"
                    f"Error: {str(e)[:100]}\n"
                    f"Trade ID: {trade.original_trade_hash[:16]}..."
                )
    
    async def calculate_position_size(self, trade: CopyTrade) -> float:
        """Calculate our position size based on the copy trading mode"""
        try:
            # Get our current account balance
            our_balance = await self.get_our_account_balance()
            
            if self.copy_mode == 'FIXED':
                # Fixed percentage of our account
                return our_balance * self.portfolio_percentage
                
            elif self.copy_mode == 'PROPORTIONAL':
                # Get target trader's account balance
                target_balance = await self.get_target_account_balance()
                
                if target_balance <= 0:
                    return our_balance * self.portfolio_percentage
                
                # Calculate target trader's position percentage
                target_pos = self.target_positions.get(trade.coin)
                if not target_pos:
                    return our_balance * self.portfolio_percentage
                
                target_position_percentage = target_pos.margin_used / target_balance
                
                # Apply same percentage to our account
                our_position_size = our_balance * target_position_percentage
                
                # Cap at our portfolio percentage limit
                max_size = our_balance * self.portfolio_percentage
                return min(our_position_size, max_size)
                
            else:
                return our_balance * self.portfolio_percentage
                
        except Exception as e:
            self.logger.error(f"Error calculating position size: {e}")
            # Fallback to fixed percentage
            our_balance = await self.get_our_account_balance()
            return our_balance * self.portfolio_percentage
    
    async def get_our_account_balance(self) -> float:
        """Get our account balance"""
        try:
            balance_info = self.client.get_balance()
            if balance_info:
                return float(balance_info.get('accountValue', 0))
            else:
                return 0.0
        except Exception as e:
            self.logger.error(f"Error getting our account balance: {e}")
            return 0.0
    
    async def get_target_account_balance(self) -> float:
        """Get target trader's account balance"""
        try:
            payload = {
                "type": "clearinghouseState", 
                "user": self.target_address
            }
            
            async with aiohttp.ClientSession() as session:
                async with session.post(self.info_url, json=payload) as response:
                    if response.status == 200:
                        data = await response.json()
                        return float(data.get('marginSummary', {}).get('accountValue', 0))
                    else:
                        return 0.0
                
        except Exception as e:
            self.logger.error(f"Error getting target account balance: {e}")
            return 0.0
    
    async def _execute_hyperliquid_trade(self, trade: CopyTrade, size: float, leverage: float) -> bool:
        """Execute trade on Hyperliquid"""
        try:
            # Determine if this is a buy or sell order
            is_buy = 'long' in trade.action or ('close' in trade.action and 'short' in trade.action)
            
            # For position opening/closing
            if 'open' in trade.action:
                # Open new position
                result = await self.client.place_order(
                    symbol=trade.coin,
                    side='buy' if is_buy else 'sell',
                    size=size,
                    leverage=leverage,
                    order_type='market'
                )
            elif 'close' in trade.action:
                # Close existing position
                result = await self.client.close_position(
                    symbol=trade.coin,
                    size=size
                )
            elif 'add' in trade.action:
                # Add to existing position
                result = await self.client.place_order(
                    symbol=trade.coin,
                    side='buy' if is_buy else 'sell',
                    size=size,
                    leverage=leverage,
                    order_type='market'
                )
            elif 'reduce' in trade.action:
                # Reduce existing position
                result = await self.client.place_order(
                    symbol=trade.coin,
                    side='sell' if 'long' in trade.action else 'buy',
                    size=size,
                    order_type='market'
                )
            else:
                self.logger.error(f"Unknown trade action: {trade.action}")
                return False
            
            if result and result.get('success'):
                self.logger.info(f"Successfully executed copy trade: {trade.action} {size} {trade.coin}")
                return True
            else:
                self.logger.error(f"Failed to execute copy trade: {result}")
                return False
                
        except Exception as e:
            self.logger.error(f"Error executing Hyperliquid trade: {e}")
            return False
    
    async def sync_positions(self):
        """Sync our current positions with tracking"""
        try:
            # Get our current positions
            positions = self.client.get_positions()
            if positions:
                self.our_positions = {pos['symbol']: pos for pos in positions}
            else:
                self.our_positions = {}
            
            # Get target positions for initial sync
            self.target_positions = await self.get_target_positions() or {}
            
            self.logger.info(f"Synced positions - Target: {len(self.target_positions)}, Ours: {len(self.our_positions)}")
            
        except Exception as e:
            self.logger.error(f"Error syncing positions: {e}")
    
    async def stop_monitoring(self):
        """Stop copy trading monitoring"""
        self.enabled = False
        self.state_manager.stop_copy_trading()
        self.logger.info("Copy trading monitor stopped")
        
        if self.notifications_enabled:
            session_info = self.state_manager.get_session_info()
            duration_str = ""
            if session_info['session_duration_seconds']:
                duration_hours = session_info['session_duration_seconds'] / 3600
                duration_str = f"\nSession duration: {duration_hours:.1f} hours"
            
            await self.notification_manager.send_message(
                f"🛑 Copy Trading Stopped\n"
                f"📊 Tracked positions: {session_info['tracked_positions_count']}\n"
                f"🔄 Copied trades: {session_info['copied_trades_count']}"
                + duration_str +
                f"\n\n💾 State saved - can resume later"
            )
    
    def get_status(self) -> Dict[str, Any]:
        """Get current copy trading status"""
        session_info = self.state_manager.get_session_info()
        
        return {
            'enabled': self.enabled and self.state_manager.is_enabled(),
            'target_address': self.target_address,
            'portfolio_percentage': self.portfolio_percentage,
            'copy_mode': self.copy_mode,
            'max_leverage': self.max_leverage,
            'target_positions': len(self.target_positions),
            'our_positions': len(self.our_positions),
            'tracked_positions': session_info['tracked_positions_count'],
            'copied_trades': session_info['copied_trades_count'],
            'session_start_time': session_info['start_time'],
            'session_duration_hours': session_info['session_duration_seconds'] / 3600 if session_info['session_duration_seconds'] else None,
            'last_check': session_info['last_check_time']
        }