simulator.js

import pkg from '@meteora-ag/dlmm';
const { DLMM } = pkg;
import { Connection, Keypair } from '@solana/web3.js';

export class ArbitrageSimulator {
    /**
     * @param {Connection} connection
     * @param {Keypair} keypair
     */
    constructor(connection, keypair) {
        this.connection = connection;
        this.keypair = keypair;
    }

    /**
     * Validate arbitrage route through simulation
     * @param {import('./utils/types.js').ArbitrageRoute} route
     * @returns {Promise<boolean>}
     */
    async validateRoute(route) {
        try {
            const pool1 = await DLMM.create(this.connection, route.pool1);
            const pool2 = await DLMM.create(this.connection, route.pool2);

            // Simulate trades to verify profitability
            const { success: trade1Success } = await this.simulateTrade(pool1);
            if (!trade1Success) {
                console.log('First trade simulation failed');
                return false;
            }

            const { success: trade2Success } = await this.simulateTrade(pool2);
            if (!trade2Success) {
                console.log('Second trade simulation failed');
                return false;
            }

            return true;
        } catch (error) {
            console.error('Error validating route:', error);
            return false;
        }
    }

    /**
     * Simulate a trade on a pool
     * @param {DLMM} dlmm - DLMM instance
     * @returns {Promise<{success: boolean}>}
     */
    async simulateTrade(dlmm) {
        try {
            // Get active bins to understand liquidity distribution
            const activeBins = await dlmm.getActiveBins();
            
            if (activeBins.length === 0) {
                console.log('No active bins found');
                return { success: false };
            }

            // Simulation successful
            return { success: true };
        } catch (error) {
            console.error('Error simulating trade:', error);
            return { success: false };
        }
    }
}