const { inherits } = require('util')
const PersistentForm = require('../lib/persistent-form')
const h = require('react-hyperscript')
const connect = require('react-redux').connect
const classnames = require('classnames')

const Identicon = require('./components/identicon')
const FromDropdown = require('./components/send/from-dropdown')
const ToAutoComplete = require('./components/send/to-autocomplete')
const CurrencyDisplay = require('./components/send/currency-display')
const MemoTextArea = require('./components/send/memo-textarea')
const GasFeeDisplay = require('./components/send/gas-fee-display-v2')

const { MIN_GAS_TOTAL } = require('./components/send/send-constants')

const { showModal } = require('./actions')

const {
  multiplyCurrencies,
  conversionGreaterThan,
  addCurrencies,
} = require('./conversion-util')
const {
  isBalanceSufficient,
} = require('./components/send/send-utils.js')
const { isValidAddress } = require('./util')

module.exports = SendTransactionScreen

inherits(SendTransactionScreen, PersistentForm)
function SendTransactionScreen () {
  PersistentForm.call(this)

  this.state = {
    dropdownOpen: false,
    errors: {
      to: null,
      amount: null,
    },
  }

  this.handleToChange = this.handleToChange.bind(this)
  this.handleAmountChange = this.handleAmountChange.bind(this)
  this.validateAmount = this.validateAmount.bind(this)
}

SendTransactionScreen.prototype.componentWillMount = function () {
  const {
    updateTokenExchangeRate,
    selectedToken = {},
    getGasPrice,
    estimateGas,
    selectedAddress,
    data,
    updateGasTotal,
  } = this.props
  const { symbol } = selectedToken || {}

  const estimateGasParams = {
    from: selectedAddress,
    gas: '746a528800',
  }

  if (symbol) {
    updateTokenExchangeRate(symbol)
    Object.assign(estimateGasParams, { value: '0x0' })
  }

  if (data) {
    Object.assign(estimateGasParams, { data })
  }

  Promise
    .all([
      getGasPrice(),
      estimateGas({
        from: selectedAddress,
        gas: '746a528800',
      }),
    ])
    .then(([gasPrice, gas]) => {

      const newGasTotal = multiplyCurrencies(gas, gasPrice, {
        toNumericBase: 'hex',
        multiplicandBase: 16,
        multiplierBase: 16,
      })
      updateGasTotal(newGasTotal)
    })
}

SendTransactionScreen.prototype.renderHeaderIcon = function () {
  const { selectedToken } = this.props

  return h('div.send-v2__send-header-icon-container', [
    selectedToken
      ? h(Identicon, {
        diameter: 40,
        address: selectedToken.address,
      })
      : h('img.send-v2__send-header-icon', { src: '../images/eth_logo.svg' })
  ])
}

SendTransactionScreen.prototype.renderTitle = function () {
  const { selectedToken } = this.props

  return h('div.send-v2__title', [selectedToken ? 'Send Tokens' : 'Send Funds'])
}

SendTransactionScreen.prototype.renderCopy = function () {
  const { selectedToken } = this.props

  const tokenText = selectedToken ? 'tokens' : 'ETH'

  return h('div.send-v2__form-header-copy', [

    h('div.send-v2__copy', `Only send ${tokenText} to an Ethereum address.`),

    h('div.send-v2__copy', 'Sending to a different crytpocurrency that is not Ethereum may result in permanent loss.'),

  ])
}

SendTransactionScreen.prototype.renderHeader = function () {
  return h('div', [
    h('div.send-v2__header', {}, [

      this.renderHeaderIcon(),

      h('div.send-v2__arrow-background', [
        h('i.fa.fa-lg.fa-arrow-circle-right.send-v2__send-arrow-icon'),
      ]),

      h('div.send-v2__header-tip'),

    ]),

  ])
}

SendTransactionScreen.prototype.renderErrorMessage = function(errorType) {
  const { errors } = this.props
  const errorMessage = errors[errorType];

  return errorMessage
    ? h('div.send-v2__error', [ errorMessage ] )
    : null
}

SendTransactionScreen.prototype.renderFromRow = function () {
  const {
    from,
    fromAccounts,
    conversionRate,
    setSelectedAddress,
    updateSendFrom,
  } = this.props

  const { dropdownOpen } = this.state

  return h('div.send-v2__form-row', [

    h('div.send-v2__form-label', 'From:'),

    h('div.send-v2__form-field', [
      h(FromDropdown, {
        dropdownOpen,
        accounts: fromAccounts,
        selectedAccount: from,
        onSelect: updateSendFrom,
        openDropdown: () => this.setState({ dropdownOpen: true }),
        closeDropdown: () => this.setState({ dropdownOpen: false }),
        conversionRate,
      }),
    ]),

  ])
}

SendTransactionScreen.prototype.handleToChange = function (event) {
  const { updateSendTo, updateSendErrors } = this.props
  const to = event.target.value
  let toError = null

  if (!to) {
    toError = 'Required'
  } else if (!isValidAddress(to)) {
    toError = 'Recipient address is invalid.'
  }

  updateSendTo(to)
  updateSendErrors({ to: toError })
}

SendTransactionScreen.prototype.renderToRow = function () {
  const { toAccounts, errors } = this.props
  const { to } = this.state

  return h('div.send-v2__form-row', [

    h('div.send-v2__form-label', [

      'To:',

      this.renderErrorMessage('to'),

    ]),

    h('div.send-v2__form-field', [
      h(ToAutoComplete, {
        to,
        accounts: toAccounts,
        onChange: this.handleToChange,
        inError: Boolean(errors.to),
      }),
    ]),

  ])
}

SendTransactionScreen.prototype.handleAmountChange = function (value) {
  const amount = value
  const { updateSendAmount } = this.props

  updateSendAmount(amount)
}

SendTransactionScreen.prototype.validateAmount = function (value) {
  const {
    from: { balance },
    updateSendErrors,
    amountConversionRate,
    conversionRate,
    primaryCurrency,
    toCurrency,
    selectedToken,
    gasTotal,
  } = this.props
  const amount = value

  let amountError = null

  const sufficientBalance = isBalanceSufficient({
    amount,
    gasTotal,
    balance,
    primaryCurrency,
    selectedToken,
    amountConversionRate,
    conversionRate,
  })

  const amountLessThanZero = conversionGreaterThan(
    { value: 0, fromNumericBase: 'dec' },
    { value: amount, fromNumericBase: 'hex' },
  )

  if (!sufficientBalance) {
    amountError = 'Insufficient funds.'
  } else if (amountLessThanZero) {
    amountError = 'Can not send negative amounts of ETH.'
  }

  updateSendErrors({ amount: amountError })
}

SendTransactionScreen.prototype.renderAmountRow = function () {
  const {
    selectedToken,
    primaryCurrency = 'ETH',
    convertedCurrency,
    amountConversionRate,
    errors,
  } = this.props

  const { amount } = this.state

  return h('div.send-v2__form-row', [

    h('div.send-v2__form-label', [
      'Amount:',
      this.renderErrorMessage('amount'),
    ]),

    h('div.send-v2__form-field', [
      h(CurrencyDisplay, {
        inError: Boolean(errors.amount),
        primaryCurrency,
        convertedCurrency,
        selectedToken,
        value: amount,
        conversionRate: amountConversionRate,
        handleChange: this.handleAmountChange,
        validate: this.validateAmount,
      }),
    ]),

  ])
}

SendTransactionScreen.prototype.renderGasRow = function () {
  const {
    conversionRate,
    convertedCurrency,
    showCustomizeGasModal,
    gasTotal = MIN_GAS_TOTAL,
  } = this.props

  return h('div.send-v2__form-row', [

    h('div.send-v2__form-label', 'Gas fee:'),

    h('div.send-v2__form-field', [

      h(GasFeeDisplay, {
        gasTotal,
        conversionRate,
        convertedCurrency,
        onClick: showCustomizeGasModal,
      }),

      h('div.send-v2__sliders-icon-container', {
        onClick: showCustomizeGasModal,
      }, [
        h('i.fa.fa-sliders.send-v2__sliders-icon'),
      ]),

    ]),

  ])
}

SendTransactionScreen.prototype.renderMemoRow = function () {
  const { updateSendMemo } = this.props
  const { memo } = this.state

  return h('div.send-v2__form-row', [

    h('div.send-v2__form-label', 'Transaction Memo:'),

    h('div.send-v2__form-field', [
      h(MemoTextArea, {
        memo,
        onChange: (event) => updateSendMemo(event.target.value),
      }),
    ]),

  ])
}

SendTransactionScreen.prototype.renderForm = function () {
  return h('div.send-v2__form', {}, [

    h('div.sendV2__form-header', [

      this.renderTitle(),

      this.renderCopy(),

    ]),

    this.renderFromRow(),

    this.renderToRow(),

    this.renderAmountRow(),

    this.renderGasRow(),

    this.renderMemoRow(),

  ])
}

SendTransactionScreen.prototype.renderFooter = function () {
  const {
    goHome,
    clearSend,
    errors: { amount: amountError, to: toError }
  } = this.props

  const noErrors = amountError === null && toError === null

  return h('div.send-v2__footer', [
    h('button.send-v2__cancel-btn', {
      onClick: () => {
        clearSend()
        goHome()
      },
    }, 'Cancel'),
    h(`button`, {
      className: classnames({
        'send-v2__next-btn': noErrors,
        'send-v2__next-btn__disabled': !noErrors,
      }),
      disabled: !noErrors,
      onClick: event => this.onSubmit(event),
    }, 'Next'),
  ])
}

SendTransactionScreen.prototype.render = function () {
  return (

    h('div.send-v2__container', [

      this.renderHeader(),

      this.renderForm(),

      this.renderFooter(),
    ])

  )
}

SendTransactionScreen.prototype.addToAddressBookIfNew = function (newAddress) {
  const { toAccounts, addToAddressBook } = this.props
  if (!toAccounts.find(({ address }) => newAddress === address)) {
    // TODO: nickname, i.e. addToAddressBook(recipient, nickname)
    addToAddressBook(newAddress)
  }
}

SendTransactionScreen.prototype.onSubmit = function (event) {
  event.preventDefault()
  const {
    from: {address: from},
    to,
    amount,
    gasLimit: gas,
    gasPrice,
    signTokenTx,
    signTx,
    selectedToken,
    toAccounts,
    clearSend,
  } = this.props

  this.addToAddressBookIfNew(to)

  const txParams = {
    from,
    value: '0',
    gas,
    gasPrice,
  }

  if (!selectedToken) {
    txParams.value = amount
    txParams.to = to
  }

  clearSend()

  selectedToken
    ? signTokenTx(selectedToken.address, to, amount, txParams)
    : signTx(txParams)
}