"""
Network Synchronization Manager
Handles real-time blockchain synchronization and balance updates
"""
import asyncio
import websockets
import json
from typing import Dict, List, Optional, Callable
from decimal import Decimal
import aiohttp
import time
from .wallet_db import WalletDB

class NetworkSync:
    def __init__(self, wallet_db: WalletDB):
        self.wallet_db = wallet_db
        self.websockets: Dict[str, websockets.WebSocketClientProtocol] = {}
        self.callbacks: Dict[str, List[Callable]] = {}
        self.running = False
        
        # API endpoints
        self.endpoints = {
            'BTC': {
                'ws': 'wss://ws.blockchain.info/inv',
                'http': 'https://blockchain.info/rawaddr/',
                'ticker': 'https://api.coingecko.com/api/v3/simple/price'
            },
            'ETH': {
                'ws': 'wss://mainnet.infura.io/ws/v3/YOUR_PROJECT_ID',
                'http': 'https://api.etherscan.io/api',
                'ticker': 'https://api.coingecko.com/api/v3/simple/price'
            },
            'SOL': {
                'ws': 'wss://api.mainnet-beta.solana.com',
                'http': 'https://api.solscan.io/account',
                'ticker': 'https://api.coingecko.com/api/v3/simple/price'
            }
        }
        
        # Price cache
        self.price_cache = {}
        self.last_price_update = {}

    async def start(self):
        """Start network synchronization"""
        self.running = True
        
        # Start price updates
        asyncio.create_task(self._price_update_loop())
        
        # Start blockchain monitoring for each currency
        tasks = []
        for currency in self.endpoints.keys():
            tasks.append(asyncio.create_task(self._monitor_blockchain(currency)))
            tasks.append(asyncio.create_task(self._monitor_mempool(currency)))
        
        await asyncio.gather(*tasks)

    async def stop(self):
        """Stop network synchronization"""
        self.running = False
        for ws in self.websockets.values():
            await ws.close()

    async def _price_update_loop(self):
        """Update cryptocurrency prices periodically"""
        while self.running:
            try:
                async with aiohttp.ClientSession() as session:
                    for currency in self.endpoints.keys():
                        params = {'ids': currency.lower(), 'vs_currencies': 'usd'}
                        async with session.get(self.endpoints[currency]['ticker'], params=params) as response:
                            if response.status == 200:
                                data = await response.json()
                                self.price_cache[currency] = data[currency.lower()]['usd']
                                self.last_price_update[currency] = time.time()
            except Exception as e:
                print(f"Error updating prices: {str(e)}")
            
            await asyncio.sleep(60)  # Update prices every minute

    async def _monitor_blockchain(self, currency: str):
        """Monitor blockchain for new blocks and transactions"""
        while self.running:
            try:
                async with websockets.connect(self.endpoints[currency]['ws']) as websocket:
                    self.websockets[currency] = websocket
                    
                    # Subscribe to blockchain updates
                    if currency == 'BTC':
                        await websocket.send('{"op":"blocks_sub"}')
                    elif currency == 'ETH':
                        await websocket.send('{"jsonrpc":"2.0","method":"eth_subscribe","params":["newHeads"],"id":1}')
                    elif currency == 'SOL':
                        await websocket.send('{"jsonrpc":"2.0","method":"blockSubscribe","params":["all"],"id":1}')

                    while self.running:
                        message = await websocket.recv()
                        await self._handle_blockchain_message(currency, json.loads(message))
                        
            except Exception as e:
                print(f"Error in {currency} blockchain monitor: {str(e)}")
                await asyncio.sleep(5)  # Wait before reconnecting

    async def _monitor_mempool(self, currency: str):
        """Monitor mempool for pending transactions"""
        while self.running:
            try:
                async with websockets.connect(self.endpoints[currency]['ws']) as websocket:
                    # Subscribe to mempool updates
                    if currency == 'BTC':
                        await websocket.send('{"op":"unconfirmed_sub"}')
                    elif currency == 'ETH':
                        await websocket.send('{"jsonrpc":"2.0","method":"eth_subscribe","params":["pendingTransactions"],"id":1}')
                    elif currency == 'SOL':
                        await websocket.send('{"jsonrpc":"2.0","method":"mempoolSubscribe","id":1}')

                    while self.running:
                        message = await websocket.recv()
                        await self._handle_mempool_message(currency, json.loads(message))
                        
            except Exception as e:
                print(f"Error in {currency} mempool monitor: {str(e)}")
                await asyncio.sleep(5)

    async def _handle_blockchain_message(self, currency: str, message: Dict):
        """Handle incoming blockchain messages"""
        try:
            if currency == 'BTC':
                if message.get('op') == 'block':
                    await self._update_btc_transactions(message)
            elif currency == 'ETH':
                if message.get('method') == 'eth_subscription':
                    await self._update_eth_transactions(message)
            elif currency == 'SOL':
                if message.get('method') == 'blockNotification':
                    await self._update_sol_transactions(message)
        except Exception as e:
            print(f"Error handling {currency} blockchain message: {str(e)}")

    async def _handle_mempool_message(self, currency: str, message: Dict):
        """Handle incoming mempool messages"""
        try:
            addresses = await self._get_monitored_addresses(currency)
            
            if currency == 'BTC':
                for addr in addresses:
                    if addr in (message.get('inputs', []) + message.get('outputs', [])):
                        await self._update_pending_transaction(currency, message)
            elif currency == 'ETH':
                # Handle ETH mempool messages
                pass
            elif currency == 'SOL':
                # Handle SOL mempool messages
                pass
        except Exception as e:
            print(f"Error handling {currency} mempool message: {str(e)}")

    async def _get_monitored_addresses(self, currency: str) -> List[str]:
        """Get list of addresses to monitor"""
        # Query database for active addresses for the specified currency
        return []  # TODO: Implement address lookup

    async def _update_pending_transaction(self, currency: str, tx_data: Dict):
        """Update pending transaction status"""
        try:
            # Update transaction status in database
            tx_hash = tx_data.get('hash')
            if tx_hash:
                self.wallet_db.update_transaction_status(
                    tx_hash=tx_hash,
                    status='pending',
                    details='Transaction seen in mempool'
                )
        except Exception as e:
            print(f"Error updating pending transaction: {str(e)}")

    async def _update_btc_transactions(self, block_data: Dict):
        """Update Bitcoin transactions"""
        try:
            # Process confirmed transactions in the block
            for tx in block_data.get('x', []):
                tx_hash = tx.get('hash')
                if tx_hash:
                    self.wallet_db.update_transaction_status(
                        tx_hash=tx_hash,
                        status='confirmed',
                        details=f"Confirmed in block {block_data.get('height')}"
                    )
        except Exception as e:
            print(f"Error updating BTC transactions: {str(e)}")

    async def _update_eth_transactions(self, block_data: Dict):
        """Update Ethereum transactions"""
        # Similar to BTC but for ETH transactions
        pass

    async def _update_sol_transactions(self, block_data: Dict):
        """Update Solana transactions"""
        # Similar to BTC but for SOL transactions
        pass

    def get_price(self, currency: str) -> Optional[Decimal]:
        """Get current price for a currency"""
        if currency in self.price_cache:
            # Return cached price if less than 5 minutes old
            if time.time() - self.last_price_update.get(currency, 0) < 300:
                return Decimal(str(self.price_cache[currency]))
        return None

    def register_callback(self, currency: str, callback: Callable):
        """Register callback for currency events"""
        if currency not in self.callbacks:
            self.callbacks[currency] = []
        self.callbacks[currency].append(callback)

    def unregister_callback(self, currency: str, callback: Callable):
        """Unregister callback"""
        if currency in self.callbacks:
            self.callbacks[currency].remove(callback)
