interface IOrderBook {
    // Order placement
    function placeOrder(
        address user,
        bool isBuy,
        uint256 amount,
        uint256 price
    ) external returns (uint256 orderId);
    
    function cancelOrder(uint256 orderId) external;
    
    // View functions
    function getBestBid() external view returns (uint256 price, uint256 amount);
    function getBestAsk() external view returns (uint256 price, uint256 amount);
    function getOrderBookDepth(uint256 levels) external view returns (
        uint256[] memory bidPrices,
        uint256[] memory bidAmounts,
        uint256[] memory askPrices, 
        uint256[] memory askAmounts
    );
    
    // Order matching events
    event OrderPlaced(uint256 indexed orderId, address indexed user, bool isBuy, uint256 amount, uint256 price);
    event OrderMatched(uint256 indexed buyOrderId, uint256 indexed sellOrderId, uint256 amount, uint256 price);
    event OrderCancelled(uint256 indexed orderId);
}

// Batch multiple operations for gas efficiency
async function batchTradeOperations(operations) {
  const calls = operations.map(op => {
    switch(op.type) {
      case 'place':
        return gtxRouter.interface.encodeFunctionData('placeOrder', [
          op.poolId, op.isBuy, op.amount, op.price, op.isMarketOrder
        ]);
      case 'cancel':
        return gtxRouter.interface.encodeFunctionData('cancelOrder', [op.orderId]);
      default:
        throw new Error(`Unknown operation type: ${op.type}`);
    }
  });
  
  // Use multicall if available, or send transactions sequentially
  const results = await Promise.all(
    calls.map(calldata => 
      wallet.sendTransaction({
        to: GTX_ROUTER_ADDRESS,
        data: calldata
      })
    )
  );
  
  return results;
}

// Monitor price changes across multiple pools
class GTXPriceMonitor {
  constructor(poolIds) {
    this.poolIds = poolIds;
    this.prices = new Map();
    this.subscribers = new Set();
  }
  
  async start() {
    // Subscribe to order matched events for price updates
    for (const poolId of this.poolIds) {
      const orderBookAddress = await poolManager.getPool(poolId);
      const orderBook = new ethers.Contract(orderBookAddress, OrderBookABI, provider);
      
      orderBook.on('OrderMatched', (buyOrderId, sellOrderId, amount, price) => {
        this.updatePrice(poolId, price);
      });
    }
    
    // Initial price fetch
    await this.fetchInitialPrices();
  }
  
  async fetchInitialPrices() {
    for (const poolId of this.poolIds) {
      try {
        const poolInfo = await gtxRouter.getPoolInfo(poolId);
        this.updatePrice(poolId, poolInfo.price);
      } catch (error) {
        console.warn(`Failed to fetch initial price for ${poolId}:`, error);
      }
    }
  }
  
  updatePrice(poolId, newPrice) {
    const oldPrice = this.prices.get(poolId);
    this.prices.set(poolId, newPrice);
    
    // Notify subscribers
    this.subscribers.forEach(callback => {
      callback({ poolId, oldPrice, newPrice });
    });
  }
  
  subscribe(callback) {
    this.subscribers.add(callback);
    return () => this.subscribers.delete(callback);
  }
}

// Gas-optimized trading strategies
class GasOptimizedTrader {
  constructor(wallet, contracts) {
    this.wallet = wallet;
    this.gtxRouter = contracts.gtxRouter;
    this.gasPrice = ethers.parseUnits('20', 'gwei'); // Adjust based on network
  }
  
  async placeOrderWithGasOptimization(orderParams) {
    // Estimate gas first
    const gasEstimate = await this.gtxRouter.placeOrder.estimateGas(
      orderParams.poolId,
      orderParams.isBuy,
      orderParams.amount,
      orderParams.price,
      orderParams.isMarketOrder
    );
    
    // Add 10% buffer and cap at reasonable limit
    const gasLimit = Math.min(gasEstimate * 1.1, 500000);
    
    return await this.gtxRouter.placeOrder(
      orderParams.poolId,
      orderParams.isBuy,
      orderParams.amount,
      orderParams.price,
      orderParams.isMarketOrder,
      {
        gasLimit,
        gasPrice: this.gasPrice
      }
    );
  }
  
  async batchCancelWithOptimization(orderIds) {
    // Use batch cancel for multiple orders
    if (orderIds.length > 1) {
      return await this.gtxRouter.batchCancelOrders(orderIds);
    } else {
      return await this.gtxRouter.cancelOrder(orderIds[0]);
    }
  }
}

# Clone the contracts repository
git clone https://github.com/Great-Trading-eXperience/clob-dex.git
cd clob-dex

# Install dependencies
npm install

# Run tests
npm test

# Deploy to local network
npm run deploy:local