contract.js

const Web3 = require('web3')
const { Random } = require('./decode')
const types = require('./types')
const chalk = require('chalk')
const { config } = require('./getConfig')

const Web3Instance = async () => {
    const rpc = Random(config.rpcURL)
    console.log(chalk.cyan(`Call:::RPC Provider: ${rpc}`))

    const _web3 = await new Web3(rpc)
    _web3.eth.accounts.wallet.clear()
    _web3.eth.accounts.wallet.add(config.secretPhrase, config.userAddress)
    _web3.eth.defaultAccount = config.userAddress

    return _web3
}

const TokenDecimals = async (tokenAddress) => {
    const token = (await Instance(types.TOKEN, tokenAddress)).methods
    return parseInt((await token.decimals().call()))
}

const Instance = async (contractType, address) => {
    const tokenAbi = [
        { "constant": false, "inputs": [{ "name": "guy", "type": "address" }, { "name": "wad", "type": "uint256" }], "name": "approve", "outputs": [{ "name": "", "type": "bool" }], "payable": false, "stateMutability": "nonpayable", "type": "function" },
        { "constant": true, "inputs": [{ "name": "", "type": "address" }], "name": "balanceOf", "outputs": [{ "name": "", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" },
        { "inputs": [], "name": "decimals", "outputs": [{ "internalType": "uint8", "name": "", "type": "uint8" }], "stateMutability": "view", "type": "function" },
        { "inputs": [], "name": "name", "outputs": [{ "internalType": "string", "name": "", "type": "string" }], "stateMutability": "view", "type": "function" },
        { "inputs": [], "name": "symbol", "outputs": [{ "internalType": "string", "name": "", "type": "string" }], "stateMutability": "view", "type": "function" },
        { "inputs": [], "name": "totalSupply", "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }], "stateMutability": "view", "type": "function" },
        { "inputs": [{ "internalType": "address", "name": "owner", "type": "address" }, { "internalType": "address", "name": "spender", "type": "address" }], "name": "allowance", "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }], "stateMutability": "view", "type": "function" },
        { "anonymous": false, "inputs": [{ "indexed": true, "internalType": "address", "name": "from", "type": "address" }, { "indexed": true, "internalType": "address", "name": "to", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "value", "type": "uint256" }], "name": "Transfer", "type": "event" }
    ]

    const routerAbi = [
        { "inputs": [{ "internalType": "uint256", "name": "amountIn", "type": "uint256" }, { "internalType": "uint256", "name": "amountOutMin", "type": "uint256" }, { "internalType": "address[]", "name": "path", "type": "address[]" }, { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "uint256", "name": "deadline", "type": "uint256" }], "name": "swapExactTokensForTokens", "outputs": [{ "internalType": "uint256[]", "name": "amounts", "type": "uint256[]" }], "stateMutability": "nonpayable", "type": "function" },
        { "inputs": [{ "internalType": "uint256", "name": "amountIn", "type": "uint256" }, { "internalType": "address[]", "name": "path", "type": "address[]" }], "name": "getAmountsOut", "outputs": [{ "internalType": "uint256[]", "name": "amounts", "type": "uint256[]" }], "stateMutability": "view", "type": "function" },
        { "inputs": [{ "internalType": "uint256", "name": "amountIn", "type": "uint256" }, { "internalType": "uint256", "name": "amountOutMin", "type": "uint256" }, { "internalType": "address[]", "name": "path", "type": "address[]" }, { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "uint256", "name": "deadline", "type": "uint256" }], "name": "swapExactTokensForETH", "outputs": [{ "internalType": "uint256[]", "name": "amounts", "type": "uint256[]" }], "stateMutability": "nonpayable", "type": "function" },
        { "inputs": [{ "internalType": "uint256", "name": "amountOutMin", "type": "uint256" }, { "internalType": "address[]", "name": "path", "type": "address[]" }, { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "uint256", "name": "deadline", "type": "uint256" }], "name": "swapExactETHForTokens", "outputs": [{ "internalType": "uint256[]", "name": "amounts", "type": "uint256[]" }], "stateMutability": "payable", "type": "function" }
    ]

    const factoryAbi = [
        { "constant": true, "inputs": [{ "internalType": "address", "name": "", "type": "address" }, { "internalType": "address", "name": "", "type": "address" }], "name": "getPair", "outputs": [{ "internalType": "address", "name": "", "type": "address" }], "payable": false, "stateMutability": "view", "type": "function" },
        { "anonymous": false, "inputs": [{ "indexed": true, "internalType": "address", "name": "token0", "type": "address" }, { "indexed": true, "internalType": "address", "name": "token1", "type": "address" }, { "indexed": false, "internalType": "address", "name": "pair", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "", "type": "uint256" }], "name": "PairCreated", "type": "event" }
    ]

    const _web3 = await Web3Instance()
    const contractAbi = contractType === types.FACTORY
        ? factoryAbi : types.ROUTER === contractType
            ? routerAbi : tokenAbi

    const contractInstance = await new _web3.eth.Contract(contractAbi, address, {
        from: config.userAddress,
        gas: config.gas
    })

    return contractInstance
}

module.exports = {
    Instance,
    Web3Instance,
    TokenDecimals
}