import ether from './helpers/ether'
import advanceToBlock from './helpers/advanceToBlock'
import EVMThrow from './helpers/EVMThrow'

const BigNumber = web3.BigNumber

const should = require('chai')
  .use(require('chai-as-promised'))
  .use(require('chai-bignumber')(BigNumber))
  .should()

const Crowdsale = artifacts.require('Crowdsale')
const MintableToken = artifacts.require('MintableToken')

contract('Crowdsale', function ([_, investor, wallet, purchaser]) {

  const rate = new BigNumber(1000)
  const value = ether(42)

  const expectedTokenAmount = rate.mul(value)

  beforeEach(async function () {
    this.startBlock = web3.eth.blockNumber + 10
    this.endBlock =   web3.eth.blockNumber + 20

    this.crowdsale = await Crowdsale.new(this.startBlock, this.endBlock, rate, wallet)

    this.token = MintableToken.at(await this.crowdsale.token())
  })

  it('should be token owner', async function () {
    const owner = await this.token.owner()
    owner.should.equal(this.crowdsale.address)
  })

  it('should be ended only after end', async function () {
    let ended = await this.crowdsale.hasEnded()
    ended.should.equal(false)
    await advanceToBlock(this.endBlock + 1)
    ended = await this.crowdsale.hasEnded()
    ended.should.equal(true)
  })

  describe('accepting payments', function () {

    it('should reject payments before start', async function () {
      await this.crowdsale.send(value).should.be.rejectedWith(EVMThrow)
      await this.crowdsale.buyTokens(investor, value, {from: purchaser}).should.be.rejectedWith(EVMThrow)
    })

    it('should accept payments after start', async function () {
      await advanceToBlock(this.startBlock - 1)
      await this.crowdsale.send(value).should.be.fulfilled
      await this.crowdsale.buyTokens(investor, {value: value, from: purchaser}).should.be.fulfilled
    })

    it('should reject payments after end', async function () {
      await advanceToBlock(this.endBlock)
      await this.crowdsale.send(value).should.be.rejectedWith(EVMThrow)
      await this.crowdsale.buyTokens(investor, {value: value, from: purchaser}).should.be.rejectedWith(EVMThrow)
    })

  })

  describe('high-level purchase', function () {

    beforeEach(async function() {
      await advanceToBlock(this.startBlock)
    })

    it('should log purchase', async function () {
      const {logs} = await this.crowdsale.sendTransaction({value: value, from: investor})

      const event = logs.find(e => e.event === 'TokenPurchase')

      should.exist(event)
      event.args.purchaser.should.equal(investor)
      event.args.beneficiary.should.equal(investor)
      event.args.value.should.be.bignumber.equal(value)
      event.args.amount.should.be.bignumber.equal(expectedTokenAmount)
    })

    it('should increase totalSupply', async function () {
      await this.crowdsale.send(value)
      const totalSupply = await this.token.totalSupply()
      totalSupply.should.be.bignumber.equal(expectedTokenAmount)
    })

    it('should assign tokens to sender', async function () {
      await this.crowdsale.sendTransaction({value: value, from: investor})
      let balance = await this.token.balanceOf(investor);
      balance.should.be.bignumber.equal(expectedTokenAmount)
    })

    it('should forward funds to wallet', async function () {
      const pre = web3.eth.getBalance(wallet)
      await this.crowdsale.sendTransaction({value, from: investor})
      const post = web3.eth.getBalance(wallet)
      post.minus(pre).should.be.bignumber.equal(value)
    })

  })

  describe('low-level purchase', function () {

    beforeEach(async function() {
      await advanceToBlock(this.startBlock)
    })

    it('should log purchase', async function () {
      const {logs} = await this.crowdsale.buyTokens(investor, {value: value, from: purchaser})

      const event = logs.find(e => e.event === 'TokenPurchase')

      should.exist(event)
      event.args.purchaser.should.equal(purchaser)
      event.args.beneficiary.should.equal(investor)
      event.args.value.should.be.bignumber.equal(value)
      event.args.amount.should.be.bignumber.equal(expectedTokenAmount)
    })

    it('should increase totalSupply', async function () {
      await this.crowdsale.buyTokens(investor, {value, from: purchaser})
      const totalSupply = await this.token.totalSupply()
      totalSupply.should.be.bignumber.equal(expectedTokenAmount)
    })

    it('should assign tokens to beneficiary', async function () {
      await this.crowdsale.buyTokens(investor, {value, from: purchaser})
      const balance = await this.token.balanceOf(investor)
      balance.should.be.bignumber.equal(expectedTokenAmount)
    })

    it('should forward funds to wallet', async function () {
      const pre = web3.eth.getBalance(wallet)
      await this.crowdsale.buyTokens(investor, {value, from: purchaser})
      const post = web3.eth.getBalance(wallet)
      post.minus(pre).should.be.bignumber.equal(value)
    })

  })

})