"""Cryptocurrency Exchange Python Implementation"""
from dataclasses import dataclass, field
from typing import Dict, List, Literal
from datetime import datetime
import uuid

@dataclass
class Wallet:
    address: str
    wallet_type: Literal['hot', 'cold']
    balances: Dict[str, float] = field(default_factory=dict)
    created_at: datetime = field(default_factory=datetime.now)

@dataclass
class Order:
    id: str
    user_id: str
    order_type: Literal['market', 'limit', 'stop_loss']
    side: Literal['buy', 'sell']
    pair: str
    price: float
    quantity: float
    status: Literal['open', 'filled', 'cancelled'] = 'open'
    created_at: datetime = field(default_factory=datetime.now)

class WalletManager:
    def __init__(self):
        self.wallets: Dict[str, Wallet] = {}

    def create_wallet(self, wallet_type: Literal['hot', 'cold']) -> Wallet:
        address = f"0x{uuid.uuid4().hex}"
        wallet = Wallet(address=address, wallet_type=wallet_type)
        self.wallets[address] = wallet
        return wallet

    def deposit(self, address: str, token: str, amount: float) -> None:
        if address not in self.wallets:
            raise ValueError("Wallet not found")
        self.wallets[address].balances[token] = \
            self.wallets[address].balances.get(token, 0) + amount

    def get_balance(self, address: str, token: str) -> float:
        return self.wallets.get(address, Wallet('', 'hot')).balances.get(token, 0)

class OrderBook:
    def __init__(self):
        self.bids: List[Order] = []
        self.asks: List[Order] = []

    def add_order(self, order: Order) -> None:
        if order.side == 'buy':
            self.bids.append(order)
            self.bids.sort(key=lambda x: x.price, reverse=True)
        else:
            self.asks.append(order)
            self.asks.sort(key=lambda x: x.price)

    def match_orders(self) -> List[Dict]:
        trades = []
        while self.bids and self.asks:
            bid, ask = self.bids[0], self.asks[0]
            if bid.price >= ask.price:
                quantity = min(bid.quantity, ask.quantity)
                trades.append({
                    'buy_id': bid.id,
                    'sell_id': ask.id,
                    'price': (bid.price + ask.price) / 2,
                    'quantity': quantity
                })
                if bid.quantity <= ask.quantity: self.bids.pop(0)
                if ask.quantity <= bid.quantity: self.asks.pop(0)
            else:
                break
        return trades
