const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');
const { expect } = require('chai');
const RLP = require('rlp');
const Enums = require('../../helpers/enums');
const { GovernorHelper } = require('../../helpers/governance');

const { shouldSupportInterfaces } = require('../../utils/introspection/SupportsInterface.behavior');

const Token = artifacts.require('$ERC20Votes');
const Timelock = artifacts.require('CompTimelock');
const Governor = artifacts.require('$GovernorTimelockCompoundMock');
const CallReceiver = artifacts.require('CallReceiverMock');

function makeContractAddress(creator, nonce) {
  return web3.utils.toChecksumAddress(
    web3.utils
      .sha3(RLP.encode([creator, nonce]))
      .slice(12)
      .substring(14),
  );
}

contract('GovernorTimelockCompound', function (accounts) {
  const [owner, voter1, voter2, voter3, voter4, other] = accounts;

  const name = 'OZ-Governor';
  // const version = '1';
  const tokenName = 'MockToken';
  const tokenSymbol = 'MTKN';
  const tokenSupply = web3.utils.toWei('100');
  const votingDelay = new BN(4);
  const votingPeriod = new BN(16);
  const value = web3.utils.toWei('1');

  beforeEach(async function () {
    const [deployer] = await web3.eth.getAccounts();

    this.token = await Token.new(tokenName, tokenSymbol, tokenName);

    // Need to predict governance address to set it as timelock admin with a delayed transfer
    const nonce = await web3.eth.getTransactionCount(deployer);
    const predictGovernor = makeContractAddress(deployer, nonce + 1);

    this.timelock = await Timelock.new(predictGovernor, 2 * 86400);
    this.mock = await Governor.new(name, votingDelay, votingPeriod, 0, this.timelock.address, this.token.address, 0);
    this.receiver = await CallReceiver.new();

    this.helper = new GovernorHelper(this.mock);

    await web3.eth.sendTransaction({ from: owner, to: this.timelock.address, value });

    await this.token.$_mint(owner, tokenSupply);
    await this.helper.delegate({ token: this.token, to: voter1, value: web3.utils.toWei('10') }, { from: owner });
    await this.helper.delegate({ token: this.token, to: voter2, value: web3.utils.toWei('7') }, { from: owner });
    await this.helper.delegate({ token: this.token, to: voter3, value: web3.utils.toWei('5') }, { from: owner });
    await this.helper.delegate({ token: this.token, to: voter4, value: web3.utils.toWei('2') }, { from: owner });

    // default proposal
    this.proposal = this.helper.setProposal(
      [
        {
          target: this.receiver.address,
          value,
          data: this.receiver.contract.methods.mockFunction().encodeABI(),
        },
      ],
      '<proposal description>',
    );
  });

  shouldSupportInterfaces(['ERC165', 'Governor', 'GovernorWithParams', 'GovernorTimelock']);

  it("doesn't accept ether transfers", async function () {
    await expectRevert.unspecified(web3.eth.sendTransaction({ from: owner, to: this.mock.address, value: 1 }));
  });

  it('post deployment check', async function () {
    expect(await this.mock.name()).to.be.equal(name);
    expect(await this.mock.token()).to.be.equal(this.token.address);
    expect(await this.mock.votingDelay()).to.be.bignumber.equal(votingDelay);
    expect(await this.mock.votingPeriod()).to.be.bignumber.equal(votingPeriod);
    expect(await this.mock.quorum(0)).to.be.bignumber.equal('0');

    expect(await this.mock.timelock()).to.be.equal(this.timelock.address);
    expect(await this.timelock.admin()).to.be.equal(this.mock.address);
  });

  it('nominal', async function () {
    await this.helper.propose();
    await this.helper.waitForSnapshot();
    await this.helper.vote({ support: Enums.VoteType.For }, { from: voter1 });
    await this.helper.vote({ support: Enums.VoteType.For }, { from: voter2 });
    await this.helper.vote({ support: Enums.VoteType.Against }, { from: voter3 });
    await this.helper.vote({ support: Enums.VoteType.Abstain }, { from: voter4 });
    await this.helper.waitForDeadline();
    const txQueue = await this.helper.queue();
    const eta = await this.mock.proposalEta(this.proposal.id);
    await this.helper.waitForEta();
    const txExecute = await this.helper.execute();

    expectEvent(txQueue, 'ProposalQueued', { proposalId: this.proposal.id });
    await expectEvent.inTransaction(txQueue.tx, this.timelock, 'QueueTransaction', { eta });

    expectEvent(txExecute, 'ProposalExecuted', { proposalId: this.proposal.id });
    await expectEvent.inTransaction(txExecute.tx, this.timelock, 'ExecuteTransaction', { eta });
    await expectEvent.inTransaction(txExecute.tx, this.receiver, 'MockFunctionCalled');
  });

  describe('should revert', function () {
    describe('on queue', function () {
      it('if already queued', async function () {
        await this.helper.propose();
        await this.helper.waitForSnapshot();
        await this.helper.vote({ support: Enums.VoteType.For }, { from: voter1 });
        await this.helper.waitForDeadline();
        await this.helper.queue();
        await expectRevert(this.helper.queue(), 'Governor: proposal not successful');
      });

      it('if proposal contains duplicate calls', async function () {
        const action = {
          target: this.token.address,
          data: this.token.contract.methods.approve(this.receiver.address, constants.MAX_UINT256).encodeABI(),
        };
        this.helper.setProposal([action, action], '<proposal description>');

        await this.helper.propose();
        await this.helper.waitForSnapshot();
        await this.helper.vote({ support: Enums.VoteType.For }, { from: voter1 });
        await this.helper.waitForDeadline();
        await expectRevert(this.helper.queue(), 'GovernorTimelockCompound: identical proposal action already queued');
        await expectRevert(this.helper.execute(), 'GovernorTimelockCompound: proposal not yet queued');
      });
    });

    describe('on execute', function () {
      it('if not queued', async function () {
        await this.helper.propose();
        await this.helper.waitForSnapshot();
        await this.helper.vote({ support: Enums.VoteType.For }, { from: voter1 });
        await this.helper.waitForDeadline(+1);

        expect(await this.mock.state(this.proposal.id)).to.be.bignumber.equal(Enums.ProposalState.Succeeded);

        await expectRevert(this.helper.execute(), 'GovernorTimelockCompound: proposal not yet queued');
      });

      it('if too early', async function () {
        await this.helper.propose();
        await this.helper.waitForSnapshot();
        await this.helper.vote({ support: Enums.VoteType.For }, { from: voter1 });
        await this.helper.waitForDeadline();
        await this.helper.queue();

        expect(await this.mock.state(this.proposal.id)).to.be.bignumber.equal(Enums.ProposalState.Queued);

        await expectRevert(
          this.helper.execute(),
          "Timelock::executeTransaction: Transaction hasn't surpassed time lock",
        );
      });

      it('if too late', async function () {
        await this.helper.propose();
        await this.helper.waitForSnapshot();
        await this.helper.vote({ support: Enums.VoteType.For }, { from: voter1 });
        await this.helper.waitForDeadline();
        await this.helper.queue();
        await this.helper.waitForEta(+30 * 86400);

        expect(await this.mock.state(this.proposal.id)).to.be.bignumber.equal(Enums.ProposalState.Expired);

        await expectRevert(this.helper.execute(), 'Governor: proposal not successful');
      });

      it('if already executed', async function () {
        await this.helper.propose();
        await this.helper.waitForSnapshot();
        await this.helper.vote({ support: Enums.VoteType.For }, { from: voter1 });
        await this.helper.waitForDeadline();
        await this.helper.queue();
        await this.helper.waitForEta();
        await this.helper.execute();
        await expectRevert(this.helper.execute(), 'Governor: proposal not successful');
      });
    });
  });

  describe('cancel', function () {
    it('cancel before queue prevents scheduling', async function () {
      await this.helper.propose();
      await this.helper.waitForSnapshot();
      await this.helper.vote({ support: Enums.VoteType.For }, { from: voter1 });
      await this.helper.waitForDeadline();

      expectEvent(await this.helper.cancel(), 'ProposalCanceled', { proposalId: this.proposal.id });

      expect(await this.mock.state(this.proposal.id)).to.be.bignumber.equal(Enums.ProposalState.Canceled);
      await expectRevert(this.helper.queue(), 'Governor: proposal not successful');
    });

    it('cancel after queue prevents executing', async function () {
      await this.helper.propose();
      await this.helper.waitForSnapshot();
      await this.helper.vote({ support: Enums.VoteType.For }, { from: voter1 });
      await this.helper.waitForDeadline();
      await this.helper.queue();

      expectEvent(await this.helper.cancel(), 'ProposalCanceled', { proposalId: this.proposal.id });

      expect(await this.mock.state(this.proposal.id)).to.be.bignumber.equal(Enums.ProposalState.Canceled);
      await expectRevert(this.helper.execute(), 'Governor: proposal not successful');
    });
  });

  describe('onlyGovernance', function () {
    describe('relay', function () {
      beforeEach(async function () {
        await this.token.$_mint(this.mock.address, 1);
      });

      it('is protected', async function () {
        await expectRevert(
          this.mock.relay(this.token.address, 0, this.token.contract.methods.transfer(other, 1).encodeABI()),
          'Governor: onlyGovernance',
        );
      });

      it('can be executed through governance', async function () {
        this.helper.setProposal(
          [
            {
              target: this.mock.address,
              data: this.mock.contract.methods
                .relay(this.token.address, 0, this.token.contract.methods.transfer(other, 1).encodeABI())
                .encodeABI(),
            },
          ],
          '<proposal description>',
        );

        expect(await this.token.balanceOf(this.mock.address), 1);
        expect(await this.token.balanceOf(other), 0);

        await this.helper.propose();
        await this.helper.waitForSnapshot();
        await this.helper.vote({ support: Enums.VoteType.For }, { from: voter1 });
        await this.helper.waitForDeadline();
        await this.helper.queue();
        await this.helper.waitForEta();
        const txExecute = await this.helper.execute();

        expect(await this.token.balanceOf(this.mock.address), 0);
        expect(await this.token.balanceOf(other), 1);

        expectEvent.inTransaction(txExecute.tx, this.token, 'Transfer', {
          from: this.mock.address,
          to: other,
          value: '1',
        });
      });
    });

    describe('updateTimelock', function () {
      beforeEach(async function () {
        this.newTimelock = await Timelock.new(this.mock.address, 7 * 86400);
      });

      it('is protected', async function () {
        await expectRevert(this.mock.updateTimelock(this.newTimelock.address), 'Governor: onlyGovernance');
      });

      it('can be executed through governance to', async function () {
        this.helper.setProposal(
          [
            {
              target: this.timelock.address,
              data: this.timelock.contract.methods.setPendingAdmin(owner).encodeABI(),
            },
            {
              target: this.mock.address,
              data: this.mock.contract.methods.updateTimelock(this.newTimelock.address).encodeABI(),
            },
          ],
          '<proposal description>',
        );

        await this.helper.propose();
        await this.helper.waitForSnapshot();
        await this.helper.vote({ support: Enums.VoteType.For }, { from: voter1 });
        await this.helper.waitForDeadline();
        await this.helper.queue();
        await this.helper.waitForEta();
        const txExecute = await this.helper.execute();

        expectEvent(txExecute, 'TimelockChange', {
          oldTimelock: this.timelock.address,
          newTimelock: this.newTimelock.address,
        });

        expect(await this.mock.timelock()).to.be.bignumber.equal(this.newTimelock.address);
      });
    });

    it('can transfer timelock to new governor', async function () {
      const newGovernor = await Governor.new(name, 8, 32, 0, this.timelock.address, this.token.address, 0);
      this.helper.setProposal(
        [
          {
            target: this.timelock.address,
            data: this.timelock.contract.methods.setPendingAdmin(newGovernor.address).encodeABI(),
          },
        ],
        '<proposal description>',
      );

      await this.helper.propose();
      await this.helper.waitForSnapshot();
      await this.helper.vote({ support: Enums.VoteType.For }, { from: voter1 });
      await this.helper.waitForDeadline();
      await this.helper.queue();
      await this.helper.waitForEta();
      const txExecute = await this.helper.execute();

      await expectEvent.inTransaction(txExecute.tx, this.timelock, 'NewPendingAdmin', {
        newPendingAdmin: newGovernor.address,
      });

      await newGovernor.__acceptAdmin();
      expect(await this.timelock.admin()).to.be.bignumber.equal(newGovernor.address);
    });
  });
});