const fs = require("fs")

function loadConfig() {
    const configPath = "./config.json";
    if (!fs.existsSync(configPath)) {
        throw new Error("Configuration file not found: " + configPath);
    }
    const configContent = fs.readFileSync(configPath, "utf-8");
    if (!configContent) {
        throw new Error("Configuration file is empty: " + configPath);
    }
    try {
        return JSON.parse(configContent);
    } catch (error) {
        throw new Error("Error parsing configuration file: " + error.message);
    }
}

class App {
    constructor(){
        const config = loadConfig();
        this.ethNodeUrl = config.nodesUrl.ETH
        const usdterc20_abi = JSON.parse(fs.readFileSync(config.abiPath.usdt_erc20_abi, "utf-8"));
        const usdcerc20_abi = JSON.parse(fs.readFileSync(config.abiPath.usdc_erc20_abi, "utf-8"));
        const usdttrc20_abi = JSON.parse(fs.readFileSync(config.abiPath.usdt_trc20_abi, "utf-8"));
        this.abis = {usdcerc20_abi, usdterc20_abi, usdttrc20_abi};
    }
}

const app = new App();

module.exports = app;