const CurveProtocol = artifacts.require('CurveProtocol')
const daiABI = require('./abi/dai');
const erc20 = require('./abi/erc20')
const swap_abi = require('./abi/swap')
const { ether, balance } = require('@openzeppelin/test-helpers');
const uniswap = require("@studydefi/money-legos/uniswap");

const BN = require('bn.js')

const chai = require('chai')
const expect = chai.expect
chai.use(require('chai-bn')(BN));

// userAddress must be unlocked using --unlock ADDRESS
const userAddress = '0xfcd22438ad6ed564a1c26151df73f6b33b817b56';
const daiAddress = '0x6b175474e89094c44da98b954eedeac495271d0f';
const daiContract = new web3.eth.Contract(daiABI, daiAddress);

const usdcAddress = '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48'
const usdcContract = new web3.eth.Contract(erc20, usdcAddress);

const swap = '0xA5407eAE9Ba41422680e2e00537571bcC53efBfD'
const swapContract = new web3.eth.Contract(swap_abi, swap)

const swapToken = '0xC25a3A3b969415c80451098fa907EC722572917F'
const tokenContract = new web3.eth.Contract(erc20, swapToken)

contract('Curve Protocol', async accounts => {
  let account, contract;

  beforeEach(async function() {
    account = accounts[0]
    contract = await CurveProtocol.deployed()

    let uniswapFactory = new web3.eth.Contract(
      uniswap.factory.abi,
      uniswap.factory.address
    );

    const daiExchangeAddress = await uniswapFactory.methods.getExchange(
      daiAddress,
    ).call();

    const daiExchange = new web3.eth.Contract(
      uniswap.exchange.abi,
      daiExchangeAddress
    );

    const daiBefore = await daiContract.methods.balanceOf(userAddress).call();

    await daiExchange.methods.ethToTokenSwapInput(
      1, // min amount of token retrieved
      2525644800, // random timestamp in the future (year 2050)
    ).send(
      {
        gas: 4000000,
        value: ether("5"),
        from: userAddress
      }
    );

    let daiAfter = await daiContract.methods.balanceOf(userAddress).call();

    expect(daiAfter - daiBefore).to.be.at.least(+ether("1000"));
  });

  it('should send ether to the user address', async () => {
    const ethBalanceBefore = await balance.current(userAddress);
    // Send 0.1 eth to userAddress to have gas to send an ERC20 tx.
    await web3.eth.sendTransaction({
      from: accounts[0],
      to: userAddress,
      value: ether('0.1')
    });
    const ethBalanceAfter = await balance.current(userAddress);
    expect(+ethBalanceAfter - +ethBalanceBefore).to.equal(+ether('0.1'))
  });

  it('should transfer DAI to CurveProtocol', async () => {
    // Get 100 DAI for first 5 accounts
    // daiAddress is passed to ganache-cli with flag `--unlock`
    // so we can use the `transfer` method
    //
    // Note: This only works as userAddress has 2546221640728945323079640 Dai,
    // should remove this dependence in the future
    const daiBalanceUser = await daiContract.methods.balanceOf(userAddress).call();
    await daiContract.methods
      .transfer(contract.address, ether('100').toString())
      .send({ from: userAddress, gasLimit: 800000 });
    const daiBalance = await daiContract.methods.balanceOf(contract.address).call();
    expect(+daiBalance).to.be.at.least(+ether('100'))
  });

  it('should approve DAI to CurveProtocol', async() => {
    await daiContract.methods
      .approve(contract.address, ether('100').toString())
      .send({ from: account, gasLimit: 800000 });
    const daiAllowance = await daiContract.methods.allowance(account, contract.address).call()
    expect(+daiAllowance).to.be.at.least(+ether('100'))
  });

  /* Deprecated as CurveProtocol is not ICurve and exchange has been implemented into sell method
  it('should exchange', async () => {
    let account = accounts[0]
    let contract = await CurveProtocol.deployed()

    // Get 100 DAI for first 5 accounts
    console.log('before');
    let get_dy = await contract.get_dy.call(0, 1, ether('1').toString())
    console.log('after');
    let min_dy = +get_dy * 0.99
    let receipt = await contract.exchange(0, 1, ether('1').toString(), 1, { from: account })
    let buyAmount = receipt.logs[0].args.buyAmount.toString()
    expect(+buyAmount).to.be.at.least(min_dy);
  });
  */

    /* Deprecated as CurveProtocol is not ICurve and calc_token_amount has been implemented into withdraw method
  it('should add liquidity', async () => {
    let account = accounts[0]
    let contract = await CurveProtocol.deployed()

    let amounts = [ether('1').toString(), 0, 0, 0]
    let token_amount = await contract.calc_token_amount.call(amounts, true)

    let receipt = await contract.add_liquidity(amounts, 1, { from: account })
    let mintAmount = receipt.logs[0].args.mintAmount.toString()
    expect(+mintAmount).to.be.at.least(+mintAmount)
  })

  it('should remove liquidity imbalance', async () => {
    let account = accounts[0]
    let contract = await CurveProtocol.deployed()

    let tokenBalance = await tokenContract.methods.balanceOf(contract.address).call()
    let receipt = await contract.remove_liquidity_imbalance(["100000000000", 0, 0, 0], { from: account })
    let burnAmount = receipt.logs[0].args.burnAmount.toString()
    let tokenBalanceAfter = await tokenContract.methods.balanceOf(contract.address).call()

//weird Ganache errors sometimes "cannot decode event"
    console.log(+tokenBalance, +tokenBalanceAfter, +burnAmount)
//expect(BN(tokenBalance)).to.be.a.bignumber.equal(BN(tokenBalanceAfter).add(burnAmount))

  })

  it('should remove liquidity in one coin', async() => {
    let account = accounts[0]
    let contract = await CurveProtocol.deployed()

    let daiBalance = await daiContract.methods.balanceOf(contract.address).call()
    let receipt = await contract.remove_liquidity_one_coin("100000000000", 0, 1, { from: account })
    let withdrawnAmount = receipt.logs[0].args.withdrawnAmount.toString()
    let daiBalanceAfter = await daiContract.methods.balanceOf(contract.address).call()

//weird Ganache errors sometimes "cannot decode event"
    console.log(+daiBalance, +daiBalanceAfter, +withdrawnAmount)
//expect(BN(daiBalance)).to.be.a.bignumber.equal(BN(daiBalanceAfter).sub(withdrawnAmount));
  })
  */
});