#!/usr/bin/env node

"use strict";

import fs from "fs";
import _module from "module";
import { dirname, resolve } from "path";
import REPL from "repl";
import vm from "vm";

import { ethers } from "ethers";

import { parseExpression as babelParseExpression } from "@babel/parser";

import { ArgParser, CLI, dump, Help, Plugin } from "../cli";
import { getPassword, getProgressBar } from "../prompt";
import { compile, ContractCode, customRequire } from "../solc";

function repeat(c: string, length: number): string {
    if (c.length === 0) { throw new Error("too short"); }
    let result = c;
    while (result.length < length) { result += result; }
    return result.substring(0, length);
}

function setupContext(path: string, context: any, plugin: Plugin) {

    context.provider = plugin.provider;
    context.accounts = plugin.accounts;

    if (!context.__filename) { context.__filename = path; }
    if (!context.__dirname) { context.__dirname = dirname(path); }
    if (!context.console) { context.console = console; }
    if (!context.require) {
        context.require = customRequire(path);
    }
    if (!context.process) { context.process = process; }

    context.ethers = ethers;
    context.version = ethers.version;

    context.Contract = ethers.Contract;
    context.ContractFactory = ethers.ContractFactory;
    context.Wallet = ethers.Wallet;

    context.providers = ethers.providers;
    context.utils = ethers.utils;

    context.abiCoder = ethers.utils.defaultAbiCoder;

    context.BN = ethers.BigNumber;
    context.BigNumber = ethers.BigNumber;
    context.FixedNumber = ethers.FixedNumber;

    context.getAddress = ethers.utils.getAddress;
    context.getContractAddress = ethers.utils.getContractAddress;
    context.getIcapAddress = ethers.utils.getIcapAddress;

    context.arrayify = ethers.utils.arrayify;
    context.concat = ethers.utils.concat;
    context.hexlify = ethers.utils.hexlify;
    context.zeroPad = ethers.utils.zeroPad;

    context.joinSignature = ethers.utils.joinSignature;
    context.splitSignature = ethers.utils.splitSignature;

    context.id = ethers.utils.id;
    context.keccak256 = ethers.utils.keccak256;
    context.namehash = ethers.utils.namehash;
    context.sha256 = ethers.utils.sha256;

    context.parseEther = ethers.utils.parseEther;
    context.parseUnits = ethers.utils.parseUnits;
    context.formatEther = ethers.utils.formatEther;
    context.formatUnits = ethers.utils.formatUnits;

    context.randomBytes = ethers.utils.randomBytes;
    context.constants = ethers.constants;

    context.parseTransaction = ethers.utils.parseTransaction;
    context.serializeTransaction = ethers.utils.serializeTransaction;

    context.toUtf8Bytes = ethers.utils.toUtf8Bytes;
    context.toUtf8String = ethers.utils.toUtf8String;
}


const cli = new CLI("sandbox");

function prepareCode(code: string): string {
    let ast = babelParseExpression(code, {
        createParenthesizedExpressions: true
    });

    // Crawl the AST, to compute needed source code manipulations
    const insert: Array<{ char: string, offset: number }> = [];
    const descend = function(node: any) {
        if (node == null || typeof(node) !== "object") { return; }
        if (Array.isArray(node)) {
            return node.forEach(descend);
        }

        // We will add parenthesis around ObjectExpressions, which
        // otherwise look like blocks
        if (node.type === "ObjectExpression") {
            insert.push({ char: "(", offset: node.start });
            insert.push({ char: ")", offset: node.end });
        }

        Object.keys(node).forEach((key) => descend(key));
    }
    descend(ast);

    // We make modifications from back to front, so we don't need
    // to adjust offsets
    insert.sort((a, b) => (b.offset - a.offset));

    // Modify the code for REPL
    insert.forEach((mod) => {
        code = code.substring(0, mod.offset) + mod.char + code.substring(mod.offset);
    });

    return code;
}

class SandboxPlugin extends Plugin {
    static getHelp(): Help {
        return {
            name: "sandbox",
            help: "Run a REPL VM environment with ethers"
        }
    }

    async prepareOptions(argParser: ArgParser): Promise<void> {
        await super.prepareOptions(argParser);
    }

    async prepareArgs(args: Array<string>): Promise<void> {
        await super.prepareArgs(args);

        if (args.length !== 0) {
            this.throwUsageError("Unexpected argument - " + JSON.stringify(args[0]));
        }

        for (let i = 0; i < this.accounts.length; i++) {
            await this.accounts[i].unlock();
        }
    }

    run(): Promise<void> {
        console.log(`version: ${ ethers.version }`);
        console.log(`network: ${ this.network.name } (chainId: ${ this.network.chainId })`);

        const filename = resolve(process.cwd(), "./sandbox.js");
        const prompt = (this.provider ? this.network.name: "no-network") + "> ";

        const evaluate = function(code: string, context: any, file: any, _callback: (error: Error, result?: any) => void) {
            // Pausing the stdin (which prompt does when it leaves), causes
            // readline to end us. So, we always re-enable stdin on a result
            const callback = (error: Error, result?: any) => {
                _callback(error, result);
                process.stdin.resume();
            };

            try {
                code = prepareCode(code);
            } catch (error) {
                if (error instanceof SyntaxError) {
                    const leftover = code.substring((<any>error).pos);
                    const loc: { line: number, column: number } = (<any>error).loc;
                    if (leftover.trim()) {
                        // After the first line, the prompt is "... "
                        console.log(repeat("-", ((loc.line === 1) ? prompt.length: 4) + loc.column - 1) + "^");
                        console.log(`Syntax Error! ${ error.message }`);
                    } else {
                        error = new REPL.Recoverable(error);
                    }
                }
                return callback(error);
            }

            try {
                const result = vm.runInContext(code, context, {
                     filename: filename
                });

                if (result instanceof Promise) {
                    result.then((result) => {
                        callback(null, result);
                    }, (error) => {
                        callback(error);
                    });
                } else {
                    callback(null, result);
                }
            } catch (error) {
                callback(error);
            }
        };

        const repl = REPL.start({
            prompt: prompt,
            eval: evaluate
        });

        setupContext(filename, repl.context, this);

        return new Promise((resolve) => {
            repl.on("exit", function() {
                console.log("");
                resolve(null);
            });
        });
    }
}
cli.addPlugin("sandbox", SandboxPlugin);


class InitPlugin extends Plugin {
    filename: string;
    force: boolean;

    static getHelp(): Help {
        return {
           name: "init FILENAME",
           help: "Create a new JSON wallet"
        }
    }

    static getOptionHelp(): Array<Help> {
        return [
            {
                name: "[ --force ]",
                help: "Overwrite any existing files"
            }
        ];
    }

    async prepareOptions(argParser: ArgParser): Promise<void> {
        await super.prepareOptions(argParser);
        this.force = argParser.consumeFlag("force");
    }

    async prepareArgs(args: Array<string>): Promise<void> {
        await super.prepareArgs(args)

        if (args.length !== 1) {
            this.throwUsageError("init requires FILENAME");
        }

        this.filename = args[0];
    }

    async run(): Promise<void> {
        if (!this.force && fs.existsSync(this.filename)) {
            this.throwError('File already exists (use --force to overwrite)');
        }

        console.log("Creating a new JSON Wallet - " + this.filename);
        console.log('Keep this password and file SAFE!! If lost or forgotten');
        console.log('it CANNOT be recovered, by ANYone, EVER.');

        let password = await getPassword("Choose a password: ");
        let confirm = await getPassword("Confirm password: ");
        if (password !== confirm) {
            this.throwError("Passwords do not match");
        }

        let wallet = ethers.Wallet.createRandom();

        let progressBar = await getProgressBar("Encrypting");
        let json = await wallet.encrypt(password, { }, progressBar);

        try {
            if (this.force) {
                fs.writeFileSync(this.filename, json);
            } else {
                fs.writeFileSync(this.filename, json, { flag: 'wx' });
            }
            console.log('New account address: ' + wallet.address);
            console.log('Saved:               ' + this.filename);
        } catch (error) {
            if (error.code === 'EEXIST') {
                this.throwError('File already exists (use --force to overwrite)');
            }
            this.throwError('Unknown Error: ' + error.message);
        }
    }
}
cli.addPlugin("init", InitPlugin);


class FundPlugin extends Plugin {
    toAddress: string;

    static getHelp(): Help {
        return {
           name: "fund TARGET",
           help: "Fund TARGET with testnet ether"
        }
    }

    async prepareArgs(args: Array<string>): Promise<void> {
        await super.prepareArgs(args);

        if (this.network.name !== "ropsten") {
            this.throwError("Funding requires --network ropsten");
        }

        if (args.length === 1) {
            this.toAddress = await this.getAddress(args[0], "Cannot fund ZERO address", false);
        } else if (args.length === 0 && this.accounts.length === 1) {
            this.toAddress = await this.accounts[0].getAddress();
        } else {
            this.throwUsageError("fund requires ADDRESS");
        }
    }

    async run(): Promise<void> {
        let url = "https:/" + "/api.ethers.io/api/v1/?action=fundAccount&address=" + this.toAddress.toLowerCase();
        return ethers.utils.fetchJson(url).then((data) => {
            console.log("Transaction Hash: " + data.hash);
        });
    }
}
cli.addPlugin("fund", FundPlugin);


class InfoPlugin extends Plugin {
    queries: Array<string>;
    addresses: Array<string>;

    static getHelp(): Help {
        return {
           name: "info [ TARGET ... ]",
           help: "Dump info for accounts, addresses and ENS names"
        }
    }

    async prepareArgs(args: Array<string>): Promise<void> {
        await super.prepareArgs(args);

        this.queries = [ ];
        let runners: Array<Promise<string>> = [];

        this.accounts.forEach((account, index) => {
            this.queries.push(`Account #${index}`);
            runners.push(account.getAddress());
        });

        args.forEach((arg) => {
            if (ethers.utils.isAddress(arg)) {
                this.queries.push(`Address: ${arg}`);
            } else {
                this.queries.push(`ENS Name: ${arg}`);
            }
            runners.push(this.provider.resolveName(arg));
        })

        this.addresses = await Promise.all(runners);
    }

    async run(): Promise<void> {
        for (let i = 0; i < this.addresses.length; i++) {
            let address = this.addresses[i];
            let { balance, nonce, code, reverse } = await ethers.utils.resolveProperties({
                balance: this.provider.getBalance(address),
                nonce: this.provider.getTransactionCount(address),
                code: this.provider.getCode(address),
                reverse: this.provider.lookupAddress(address)
            });

            let info: any = {
                "Address": address,
                "Balance": (ethers.utils.formatEther(balance) + " ether"),
                "Transaction Count": nonce
            }

            if (code != "0x") {
                info["Code"] = code;
            }

            if (reverse) {
                info["Reverse Lookup"] = reverse;
            }

            dump(this.queries[i], info);
        }
    }
}
cli.addPlugin("info", InfoPlugin);


class SendPlugin extends Plugin {
    toAddress: string;
    value: ethers.BigNumber;
    allowZero: boolean;
    data: string;

    static getHelp(): Help {
        return {
           name: "send TARGET ETHER",
           help: "Send ETHER ether to TARGET form accounts[0]"
        }
    }

    static getOptionHelp(): Array<Help> {
        return [
            {
                name: "[ --allow-zero ]",
                help: "Allow sending to the address zero"
            },
            {
                name: "[ --data DATA ]",
                help: "Include data in the transaction"
            }
        ];
    }

    async prepareOptions(argParser: ArgParser): Promise<void> {
        await super.prepareOptions(argParser);

        if (this.accounts.length !== 1) {
            this.throwUsageError("send requires exactly one account");
        }

        this.data = ethers.utils.hexlify(argParser.consumeOption("data") || "0x");
        this.allowZero = argParser.consumeFlag("allow-zero");
    }

    async prepareArgs(args: Array<string>): Promise<void> {
        await super.prepareArgs(args);

        if (args.length !== 2) {
            this.throwUsageError("send requires exactly ADDRESS and AMOUNT");
        }

        this.toAddress = await this.getAddress(args[0], "Cannot send to the zero address (use --allow-zero to override)", this.allowZero);
        this.value = ethers.utils.parseEther(args[1]);
    }

    async run(): Promise<void> {
        await this.accounts[0].sendTransaction({
            to: this.toAddress,
            data: this.data,
            value: this.value
        });;
    }
}
cli.addPlugin("send", SendPlugin);


class SweepPlugin extends Plugin {
    toAddress: string;

    static getHelp(): Help {
        return {
           name: "sweep TARGET",
           help: "Send all ether from accounts[0] to TARGET"
        }
    }

    async prepareOptions(argParser: ArgParser): Promise<void> {
        await super.prepareOptions(argParser);

        if (this.accounts.length !== 1) {
            this.throwUsageError("sweep requires exactly one account");
        }
    }

    async prepareArgs(args: Array<string>): Promise<void> {
        await super.prepareArgs(args);

        if (args.length !== 1) {
            this.throwUsageError("sweep requires exactly ADDRESS");
        }

        this.toAddress = await this.getAddress(args[0]);;
    }

    async run(): Promise<void> {

        let { balance, gasPrice, code } = await ethers.utils.resolveProperties({
            balance: this.provider.getBalance(this.accounts[0].getAddress()),
            gasPrice: (this.gasPrice || this.provider.getGasPrice()),
            code: this.provider.getCode(this.toAddress)
        });

        if (code !== "0x") {
            this.throwError("Cannot sweep to a contract address");
        }

        let maxSpendable = balance.sub(gasPrice.mul(21000));
        if (maxSpendable.lte(0)) {
            this.throwError("Insufficient funds to sweep");
        }

        await this.accounts[0].sendTransaction({
            to: this.toAddress,
            gasLimit: 21000,
            gasPrice: gasPrice,
            value: maxSpendable
        });
    }
}
cli.addPlugin("sweep", SweepPlugin);


class SignMessagePlugin extends Plugin {
    message: string;
    hex: boolean;

    static getHelp(): Help {
        return {
           name: "sign-message MESSAGE",
           help: "Sign a MESSAGE with accounts[0]"
        }
    }

    static getOptionHelp(): Array<Help> {
        return [
            {
                name: "[ --hex ]",
                help: "The message content is hex encoded"
            }
        ];
    }

    async prepareOptions(argParser: ArgParser): Promise<void> {
        await super.prepareOptions(argParser);
        if (this.accounts.length !== 1) {
            this.throwError("sign-message requires exactly one account");
        }
        this.hex = argParser.consumeFlag("hex");
    }

    async prepareArgs(args: Array<string>): Promise<void> {
        await super.prepareArgs(args);

        if (args.length !== 1) {
            this.throwError("send requires exactly MESSAGE");
        }

        this.message = args[0];
    }

    async run(): Promise<void> {
        await this.accounts[0].signMessage(this.message);
    }
}
cli.addPlugin("sign-message", SignMessagePlugin);


class EvalPlugin extends Plugin {
    code: string;

    static getHelp(): Help {
        return {
           name: "eval CODE",
           help: "Run CODE in a VM with ethers"
        }
    }

    async prepareArgs(args: Array<string>): Promise<void> {
        await super.prepareArgs(args);

        if (args.length !== 1) {
            this.throwError("eval requires exactly CODE");
        }

        this.code = args[0];
    }

    async run(): Promise<void> {
        let contextObject = { };
        setupContext(resolve(process.cwd(), "./sandbox.js"), contextObject, this);

        let context = vm.createContext(contextObject);
        let script = new vm.Script(this.code, { filename: "-" });

        let result = script.runInContext(context);
        if (result instanceof Promise) {
            result = await result;
        }

        console.log(result);
    }
}
cli.addPlugin("eval", EvalPlugin);


class RunPlugin extends Plugin {
    filename: string;

    static getHelp(): Help {
        return {
           name: "run FILENAME",
           help: "Run FILENAME in a VM with ethers"
        }
    }

    async prepareArgs(args: Array<string>): Promise<void> {
        await super.prepareArgs(args);

        if (args.length !== 1) {
            this.throwError("run requires exactly FILENAME");
        }

        this.filename = args[0];
    }

    async run(): Promise<void> {
        let contextObject = { };
        setupContext(resolve(this.filename), contextObject, this);

        let context = vm.createContext(contextObject);
        let script = new vm.Script(fs.readFileSync(this.filename).toString(), { filename: this.filename });

        let result = script.runInContext(context);
        if (result instanceof Promise) {
            result = await result;
        }

        console.log(result);
    }
}
cli.addPlugin("run", RunPlugin);


class WaitPlugin extends Plugin {
    hash: string;

    static getHelp(): Help {
        return {
           name: "wait HASH",
           help: "Wait for a transaction HASH to be mined"
        }
    }

    async prepareArgs(args: Array<string>): Promise<void> {
        await super.prepareArgs(args);

        if (args.length !== 1) {
            this.throwError("wait requires exactly HASH");
        }

        this.hash = args[0];
    }

    async run(): Promise<void> {
        console.log("Waiting for Transaction:", this.hash);

        let receipt = await this.provider.waitForTransaction(this.hash);
        dump("Response:", {
            "Block": receipt.blockNumber,
            "Block Hash": receipt.blockHash,
            "Status": (receipt.status ? "ok": "failed")
        });
    }
}
cli.addPlugin("wait", WaitPlugin);

const WethAddress = "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2";
const WethAbi = [
    "function deposit() payable",
    "function withdraw(uint wad)"
];

class WrapEtherPlugin extends Plugin {
    value: ethers.BigNumber;

    static getHelp(): Help {
        return {
           name: "wrap-ether VALUE",
           help: "Deposit VALUE into Wrapped Ether (WETH)"
        }
    }

    async prepareArgs(args: Array<string>): Promise<void> {
        await super.prepareArgs(args);

        if (this.accounts.length !== 1) {
            this.throwError("wrap-ether requires exactly one account");
        }

        if (args.length !== 1) {
            this.throwError("wrap-ether requires exactly VALUE");
        }

        this.value = ethers.utils.parseEther(args[0]);

        const address = await this.accounts[0].getAddress();
        const balance = await this.provider.getBalance(address);

        if (balance.lt(this.value)) {
            this.throwError("insufficient ether to wrap");
        }
    }

    async run(): Promise<void> {
        let address = await this.accounts[0].getAddress();

        this.dump("Wrapping ether", {
            "From": address,
            "Value": ethers.utils.formatEther(this.value)
        });

        let contract = new ethers.Contract(WethAddress, WethAbi, this.accounts[0]);
        await contract.deposit({ value: this.value });
    }
}
cli.addPlugin("wrap-ether", WrapEtherPlugin);

class UnwrapEtherPlugin extends Plugin {
    value: ethers.BigNumber;

    static getHelp(): Help {
        return {
           name: "unwrap-ether VALUE",
           help: "Withdraw VALUE from Wrapped Ether (WETH)"
        }
    }

    async prepareArgs(args: Array<string>): Promise<void> {
        await super.prepareArgs(args);

        if (this.accounts.length !== 1) {
            this.throwError("unwrap-ether requires exactly one account");
        }

        if (args.length !== 1) {
            this.throwError("unwrap-ether requires exactly VALUE");
        }

        this.value = ethers.utils.parseEther(args[0]);
    }

    async run(): Promise<void> {
        await super.run();

        let address = await this.accounts[0].getAddress();
        this.dump("Withdrawing Wrapped Ether", {
            "To": address,
            "Value": ethers.utils.formatEther(this.value)
        });

        let contract = new ethers.Contract(WethAddress, WethAbi, this.accounts[0]);
        await contract.withdraw(this.value);
    }
}
cli.addPlugin("unwrap-ether", UnwrapEtherPlugin);

const Erc20Abi = [
    "function decimals() view returns (uint8)",
    "function symbol() view returns (string)",
    "function name() view returns (string)",
    "function balanceOf(address) view returns (uint)",
    "function transfer(address to, uint256 value)"
];

const Erc20AltAbi = [
    "function symbol() view returns (bytes32)",
    "function name() view returns (bytes32)",
];

class SendTokenPlugin extends Plugin {
    contract: ethers.Contract;
    toAddress: string;
    decimals: number;
    value: ethers.BigNumber;

    static getHelp(): Help {
        return {
           name: "send-token TOKEN ADDRESS VALUE",
           help: "Send VALUE tokens (at TOKEN) to ADDRESS"
        }
    }

    async prepareArgs(args: Array<string>): Promise<void> {
        await super.prepareArgs(args);

        if (args.length !== 3) {
            this.throwError("send-token requires exactly TOKEN, ADDRESS and VALUE");
        }

        if (this.accounts.length !== 1) {
            this.throwError("send-token requires exactly one account");
        }

        let tokenAddress = await this.getAddress(args[0]);
        this.contract = new ethers.Contract(tokenAddress, Erc20Abi, this.accounts[0]);

        this.decimals = await this.contract.decimals();

        this.toAddress = await this.getAddress(args[1]);
        this.value = ethers.utils.parseUnits(args[2], this.decimals);
    }

    async run(): Promise<void> {
        const info: { [ name: string ]: any } = {
            "To": this.toAddress,
            "Token Contract": this.contract.address,
            "Value": ethers.utils.formatUnits(this.value, this.decimals)
        };

        let namePromise = this.contract.name().then((name: string) => {
            if (name === "") { throw new Error("returned zero"); }
            info["Token Name"] = name;
        }, (error: Error) => {
            let contract = new ethers.Contract(this.contract.address, Erc20AltAbi, this.contract.signer);
            contract.name().then((name: string) => {
                info["Token Name"] = ethers.utils.parseBytes32String(name);
            }, (error: Error) => {
                throw error;
            });
        });

        let symbolPromise = this.contract.symbol().then((symbol: string) => {
            if (symbol === "") { throw new Error("returned zero"); }
            info["Token Symbol"] = symbol;
        }, (error: Error) => {
            let contract = new ethers.Contract(this.contract.address, Erc20AltAbi, this.contract.signer);
            contract.symbol().then((symbol: string) => {
                info["Token Symbol"] = ethers.utils.parseBytes32String(symbol);
            }, (error: Error) => {
                throw error;
            });
        });

        await namePromise;
        await symbolPromise;

        this.dump("Sending Tokens:", info);

        await this.contract.transfer(this.toAddress, this.value);
    }
}
cli.addPlugin("send-token", SendTokenPlugin);


class CompilePlugin extends Plugin {
    filename: string;
    noOptimize: boolean;
    warnings: boolean;

    static getHelp(): Help {
        return {
           name: "compile FILENAME",
           help: "Compiles a Solidity contract"
        }
    }

    static getOptionHelp(): Array<Help> {
        return [
            {
                name: "[ --no-optimize ]",
                help: "Do not optimize the compiled output"
            },
            {
                name: "[ --warnings ]",
                help: "Error on any warning"
            }
        ];
    }

    async prepareOptions(argParser: ArgParser): Promise<void> {
        await super.prepareOptions(argParser);

        this.noOptimize = argParser.consumeFlag("no-optimize");
        this.warnings = argParser.consumeFlag("warnings");
    }

    async prepareArgs(args: Array<string>): Promise<void> {
        await super.prepareArgs(args);

        if (args.length !== 1) {
            this.throwError("compile requires exactly FILENAME");
        }

        this.filename = resolve(args[0]);
    }

    async run(): Promise<void> {
        const source = fs.readFileSync(this.filename).toString();

        let result: Array<ContractCode> = null;
        try {
            result = compile(source, {
                filename: this.filename,
                optimize: (!this.noOptimize)
            });
        } catch (error) {
            if (error.errors) {
                error.errors.forEach((error: string) => {
                    console.log(error);
                });
            } else {
                throw error;
            }
            throw new Error("Failed to compile contract.");
        }

        let output: any = { };
        result.forEach((contract, index) => {
            output[contract.name] = {
                bytecode: contract.bytecode,
                runtime: contract.runtime,
                interface: contract.interface.fragments.map((f) => f.format(ethers.utils.FormatTypes.full)),
                compiler: contract.compiler
            };
        });

        console.log(JSON.stringify(output, null, 4));
    }
}
cli.addPlugin("compile", CompilePlugin);

class DeployPlugin extends Plugin {
    filename: string;
    contractName: string;
    noOptimize: boolean;

    static getHelp(): Help {
        return {
           name: "deploy FILENAME",
           help: "Compile and deploy a Solidity contract"
        }
    }

    static getOptionHelp(): Array<Help> {
        return [
            {
                name: "[ --no-optimize ]",
                help: "Do not optimize the compiled output"
            },
            {
                name: "[ --contract NAME ]",
                help: "Specify the contract to deploy"
            }
        ];
    }

    async prepareOptions(argParser: ArgParser): Promise<void> {
        await super.prepareOptions(argParser);

        if (this.accounts.length !== 1) {
            this.throwError("deploy requires exactly one account");
        }

        this.noOptimize = argParser.consumeFlag("no-optimize");
        this.contractName = argParser.consumeOption("contract");
    }

    async prepareArgs(args: Array<string>): Promise<void> {
        await super.prepareArgs(args);

        if (args.length !== 1) {
            this.throwError("deploy requires exactly FILENAME");
        }

        this.filename = resolve(args[0]);
    }

    async run(): Promise<void> {
        let source = fs.readFileSync(this.filename).toString();
        let result: Array<ContractCode> = null;
        try {
            result = compile(source, {
                filename: this.filename,
                optimize: (!this.noOptimize)
            });
        } catch (error) {
            if (error.errors) {
                error.errors.forEach((error: string) => {
                    console.log(error);
                });
            } else {
                throw error;
            }
            throw new Error("Failed to compile contract.");
        }

        const codes = result.filter((c) => (this.contractName == null || this.contractName == c.name));

        if (codes.length > 1) {
            this.throwError("Multiple contracts found; please specify a contract with --contract NAME");
        }

        if (codes.length === 0) {
            this.throwError("No contract found");
        }

        const factory = new ethers.ContractFactory(codes[0].interface, codes[0].bytecode, this.accounts[0]);

        dump("Deploying:", {
            Contract: codes[0].name,
            Bytecode: codes[0].bytecode,
            Interface: codes[0].interface.fragments.map((f) => f.format(ethers.utils.FormatTypes.full)),
            Compiler: codes[0].compiler,
            Optimizer: (this.noOptimize ? "No": "Yes")
        });

        const contract = await factory.deploy();

        dump("Deployed:", {
            Contract: codes[0].name,
            Address: contract.address,
        });
    }
}
cli.addPlugin("deploy", DeployPlugin);

cli.run(process.argv.slice(2));