const { ether } = require('../helpers/ether');
const { advanceBlock } = require('../helpers/advanceToBlock');
const { increaseTimeTo, duration } = require('../helpers/increaseTime');
const { latestTime } = require('../helpers/latestTime');
const { expectThrow } = require('../helpers/expectThrow');
const { EVMRevert } = require('../helpers/EVMRevert');

const BigNumber = web3.BigNumber;

require('chai')
  .use(require('chai-bignumber')(BigNumber))
  .should();

const TimedCrowdsale = artifacts.require('TimedCrowdsaleImpl');
const SimpleToken = artifacts.require('SimpleToken');

contract('TimedCrowdsale', function ([_, investor, wallet, purchaser]) {
  const rate = new BigNumber(1);
  const value = ether(42);
  const tokenSupply = new BigNumber('1e22');

  before(async function () {
    // Advance to the next block to correctly read time in the solidity "now" function interpreted by ganache
    await advanceBlock();
  });

  beforeEach(async function () {
    this.openingTime = (await latestTime()) + duration.weeks(1);
    this.closingTime = this.openingTime + duration.weeks(1);
    this.afterClosingTime = this.closingTime + duration.seconds(1);
    this.token = await SimpleToken.new();
  });

  it('rejects an opening time in the past', async function () {
    await expectThrow(TimedCrowdsale.new(
      (await latestTime()) - duration.days(1), this.closingTime, rate, wallet, this.token.address
    ), EVMRevert);
  });

  it('rejects a closing time before the opening time', async function () {
    await expectThrow(TimedCrowdsale.new(
      this.openingTime, this.openingTime - duration.seconds(1), rate, wallet, this.token.address
    ), EVMRevert);
  });

  context('with crowdsale', function () {
    beforeEach(async function () {
      this.crowdsale = await TimedCrowdsale.new(this.openingTime, this.closingTime, rate, wallet, this.token.address);
      await this.token.transfer(this.crowdsale.address, tokenSupply);
    });

    it('should be ended only after end', async function () {
      (await this.crowdsale.hasClosed()).should.equal(false);
      await increaseTimeTo(this.afterClosingTime);
      (await this.crowdsale.hasClosed()).should.equal(true);
    });

    describe('accepting payments', function () {
      it('should reject payments before start', async function () {
        await expectThrow(this.crowdsale.send(value), EVMRevert);
        await expectThrow(this.crowdsale.buyTokens(investor, { from: purchaser, value: value }), EVMRevert);
      });

      it('should accept payments after start', async function () {
        await increaseTimeTo(this.openingTime);
        await this.crowdsale.send(value);
        await this.crowdsale.buyTokens(investor, { value: value, from: purchaser });
      });

      it('should reject payments after end', async function () {
        await increaseTimeTo(this.afterClosingTime);
        await expectThrow(this.crowdsale.send(value), EVMRevert);
        await expectThrow(this.crowdsale.buyTokens(investor, { value: value, from: purchaser }), EVMRevert);
      });
    });
  });
});