import { DummyERC20TokenContract, ERC20ProxyContract, ERC20TokenContract } from '@0x/abi-gen-wrappers';
import * as artifacts from '@0x/contract-artifacts';
import { BlockchainLifecycle, devConstants } from '@0x/dev-utils';
import { ExchangeContractErrs } from '@0x/types';
import { BigNumber } from '@0x/utils';
import * as chai from 'chai';

import { assetDataUtils } from '../src/asset_data_utils';
import { constants } from '../src/constants';
import { ExchangeTransferSimulator } from '../src/exchange_transfer_simulator';
import { BalanceAndProxyAllowanceLazyStore } from '../src/store/balance_and_proxy_allowance_lazy_store';
import { TradeSide, TransferType } from '../src/types';

import { chaiSetup } from './utils/chai_setup';
import { SimpleERC20BalanceAndProxyAllowanceFetcher } from './utils/simple_erc20_balance_and_proxy_allowance_fetcher';
import { provider, web3Wrapper } from './utils/web3_wrapper';

chaiSetup.configure();
const expect = chai.expect;
const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);

describe('ExchangeTransferSimulator', async () => {
    const transferAmount = new BigNumber(5);
    let userAddresses: string[];
    let dummyERC20Token: DummyERC20TokenContract;
    let coinbase: string;
    let sender: string;
    let recipient: string;
    let exampleAssetData: string;
    let exchangeTransferSimulator: ExchangeTransferSimulator;
    let txHash: string;
    let erc20ProxyAddress: string;
    before(async function(): Promise<void> {
        const mochaTestTimeoutMs = 20000;
        this.timeout(mochaTestTimeoutMs); // tslint:disable-line:no-invalid-this

        userAddresses = await web3Wrapper.getAvailableAddressesAsync();
        [coinbase, sender, recipient] = userAddresses;

        const txDefaults = {
            gas: devConstants.GAS_LIMIT,
            from: devConstants.TESTRPC_FIRST_ADDRESS,
        };

        const erc20Proxy = await ERC20ProxyContract.deployFrom0xArtifactAsync(
            artifacts.ERC20Proxy,
            provider,
            txDefaults,
        );
        erc20ProxyAddress = erc20Proxy.address;

        const totalSupply = new BigNumber(100000000000000000000);
        const name = 'Test';
        const symbol = 'TST';
        const decimals = new BigNumber(18);
        // tslint:disable-next-line:no-unused-variable
        dummyERC20Token = await DummyERC20TokenContract.deployFrom0xArtifactAsync(
            artifacts.DummyERC20Token,
            provider,
            txDefaults,
            name,
            symbol,
            decimals,
            totalSupply,
        );

        exampleAssetData = assetDataUtils.encodeERC20AssetData(dummyERC20Token.address);
    });
    beforeEach(async () => {
        await blockchainLifecycle.startAsync();
    });
    afterEach(async () => {
        await blockchainLifecycle.revertAsync();
    });
    describe('#transferFromAsync', function(): void {
        // HACK: For some reason these tests need a slightly longer timeout
        const mochaTestTimeoutMs = 3000;
        this.timeout(mochaTestTimeoutMs); // tslint:disable-line:no-invalid-this
        beforeEach(() => {
            const simpleERC20BalanceAndProxyAllowanceFetcher = new SimpleERC20BalanceAndProxyAllowanceFetcher(
                (dummyERC20Token as any) as ERC20TokenContract,
                erc20ProxyAddress,
            );
            const balanceAndProxyAllowanceLazyStore = new BalanceAndProxyAllowanceLazyStore(
                simpleERC20BalanceAndProxyAllowanceFetcher,
            );
            exchangeTransferSimulator = new ExchangeTransferSimulator(balanceAndProxyAllowanceLazyStore);
        });
        it("throws if the user doesn't have enough allowance", async () => {
            return expect(
                exchangeTransferSimulator.transferFromAsync(
                    exampleAssetData,
                    sender,
                    recipient,
                    transferAmount,
                    TradeSide.Taker,
                    TransferType.Trade,
                ),
            ).to.be.rejectedWith(ExchangeContractErrs.InsufficientTakerAllowance);
        });
        it("throws if the user doesn't have enough balance", async () => {
            txHash = await dummyERC20Token.approve.sendTransactionAsync(erc20ProxyAddress, transferAmount, {
                from: sender,
            });
            await web3Wrapper.awaitTransactionSuccessAsync(txHash);
            return expect(
                exchangeTransferSimulator.transferFromAsync(
                    exampleAssetData,
                    sender,
                    recipient,
                    transferAmount,
                    TradeSide.Maker,
                    TransferType.Trade,
                ),
            ).to.be.rejectedWith(ExchangeContractErrs.InsufficientMakerBalance);
        });
        it('updates balances and proxyAllowance after transfer', async () => {
            txHash = await dummyERC20Token.transfer.sendTransactionAsync(sender, transferAmount, {
                from: coinbase,
            });
            await web3Wrapper.awaitTransactionSuccessAsync(txHash);

            txHash = await dummyERC20Token.approve.sendTransactionAsync(erc20ProxyAddress, transferAmount, {
                from: sender,
            });
            await web3Wrapper.awaitTransactionSuccessAsync(txHash);

            await exchangeTransferSimulator.transferFromAsync(
                exampleAssetData,
                sender,
                recipient,
                transferAmount,
                TradeSide.Taker,
                TransferType.Trade,
            );
            const store = (exchangeTransferSimulator as any)._store;
            const senderBalance = await store.getBalanceAsync(exampleAssetData, sender);
            const recipientBalance = await store.getBalanceAsync(exampleAssetData, recipient);
            const senderProxyAllowance = await store.getProxyAllowanceAsync(exampleAssetData, sender);
            expect(senderBalance).to.be.bignumber.equal(0);
            expect(recipientBalance).to.be.bignumber.equal(transferAmount);
            expect(senderProxyAllowance).to.be.bignumber.equal(0);
        });
        it("doesn't update proxyAllowance after transfer if unlimited", async () => {
            txHash = await dummyERC20Token.transfer.sendTransactionAsync(sender, transferAmount, {
                from: coinbase,
            });
            await web3Wrapper.awaitTransactionSuccessAsync(txHash);
            txHash = await dummyERC20Token.approve.sendTransactionAsync(
                erc20ProxyAddress,
                constants.UNLIMITED_ALLOWANCE_IN_BASE_UNITS,
                {
                    from: sender,
                },
            );
            await web3Wrapper.awaitTransactionSuccessAsync(txHash);
            await exchangeTransferSimulator.transferFromAsync(
                exampleAssetData,
                sender,
                recipient,
                transferAmount,
                TradeSide.Taker,
                TransferType.Trade,
            );
            const store = (exchangeTransferSimulator as any)._store;
            const senderBalance = await store.getBalanceAsync(exampleAssetData, sender);
            const recipientBalance = await store.getBalanceAsync(exampleAssetData, recipient);
            const senderProxyAllowance = await store.getProxyAllowanceAsync(exampleAssetData, sender);
            expect(senderBalance).to.be.bignumber.equal(0);
            expect(recipientBalance).to.be.bignumber.equal(transferAmount);
            expect(senderProxyAllowance).to.be.bignumber.equal(constants.UNLIMITED_ALLOWANCE_IN_BASE_UNITS);
        });
    });
});