import React, { Component } from 'react'
import PropTypes from 'prop-types'
import { debounce } from 'lodash'
import {
  getAmountErrorObject,
  getGasFeeErrorObject,
  getToAddressForGasUpdate,
  doesAmountErrorRequireUpdate,
} from './send.utils'
import { getToWarningObject, getToErrorObject } from './send-content/add-recipient/add-recipient'
import SendHeader from './send-header'
import AddRecipient from './send-content/add-recipient'
import SendContent from './send-content'
import SendFooter from './send-footer'
import EnsInput from './send-content/add-recipient/ens-input'

export default class SendTransactionScreen extends Component {

  static propTypes = {
    addressBook: PropTypes.arrayOf(PropTypes.object),
    amount: PropTypes.string,
    blockGasLimit: PropTypes.string,
    conversionRate: PropTypes.number,
    editingTransactionId: PropTypes.string,
    fetchBasicGasEstimates: PropTypes.func.isRequired,
    from: PropTypes.object,
    gasLimit: PropTypes.string,
    gasPrice: PropTypes.string,
    gasTotal: PropTypes.string,
    hasHexData: PropTypes.bool,
    history: PropTypes.object,
    network: PropTypes.string,
    primaryCurrency: PropTypes.string,
    resetSendState: PropTypes.func.isRequired,
    selectedAddress: PropTypes.string,
    sendToken: PropTypes.object,
    showHexData: PropTypes.bool,
    to: PropTypes.string,
    toNickname: PropTypes.string,
    tokens: PropTypes.array,
    tokenBalance: PropTypes.string,
    tokenContract: PropTypes.object,
    updateAndSetGasLimit: PropTypes.func.isRequired,
    updateSendEnsResolution: PropTypes.func.isRequired,
    updateSendEnsResolutionError: PropTypes.func.isRequired,
    updateSendErrors: PropTypes.func.isRequired,
    updateSendTo: PropTypes.func.isRequired,
    updateSendTokenBalance: PropTypes.func.isRequired,
    updateToNicknameIfNecessary: PropTypes.func.isRequired,
    scanQrCode: PropTypes.func.isRequired,
    qrCodeDetected: PropTypes.func.isRequired,
    qrCodeData: PropTypes.object,
  }

  static contextTypes = {
    t: PropTypes.func,
    metricsEvent: PropTypes.func,
  }

  state = {
    query: '',
    toError: null,
    toWarning: null,
  }

  constructor (props) {
    super(props)
    this.dValidate = debounce(this.validate, 1000)
  }

  componentDidUpdate (prevProps) {
    const {
      amount,
      conversionRate,
      from: { address, balance },
      gasTotal,
      network,
      primaryCurrency,
      sendToken,
      tokenBalance,
      updateSendErrors,
      updateSendTo,
      updateSendTokenBalance,
      tokenContract,
      to,
      toNickname,
      addressBook,
      updateToNicknameIfNecessary,
      qrCodeData,
      qrCodeDetected,
    } = this.props

    let updateGas = false
    const {
      from: { balance: prevBalance },
      gasTotal: prevGasTotal,
      tokenBalance: prevTokenBalance,
      network: prevNetwork,
      sendToken: prevSendToken,
      to: prevTo,
    } = prevProps

    const uninitialized = [prevBalance, prevGasTotal].every((n) => n === null)

    const amountErrorRequiresUpdate = doesAmountErrorRequireUpdate({
      balance,
      gasTotal,
      prevBalance,
      prevGasTotal,
      prevTokenBalance,
      sendToken,
      tokenBalance,
    })

    if (amountErrorRequiresUpdate) {
      const amountErrorObject = getAmountErrorObject({
        amount,
        balance,
        conversionRate,
        gasTotal,
        primaryCurrency,
        sendToken,
        tokenBalance,
      })
      const gasFeeErrorObject = sendToken
        ? getGasFeeErrorObject({
          balance,
          conversionRate,
          gasTotal,
          primaryCurrency,
          sendToken,
        })
        : { gasFee: null }
      updateSendErrors(Object.assign(amountErrorObject, gasFeeErrorObject))
    }

    if (!uninitialized) {

      if (network !== prevNetwork && network !== 'loading') {
        updateSendTokenBalance({
          sendToken,
          tokenContract,
          address,
        })
        updateToNicknameIfNecessary(to, toNickname, addressBook)
        updateGas = true
      }
    }

    const prevTokenAddress = prevSendToken && prevSendToken.address
    const sendTokenAddress = sendToken && sendToken.address

    if (sendTokenAddress && prevTokenAddress !== sendTokenAddress) {
      this.updateSendToken()
      updateGas = true
    }

    let scannedAddress
    if (qrCodeData) {
      if (qrCodeData.type === 'address') {
        scannedAddress = qrCodeData.values.address.toLowerCase()
        const currentAddress = prevTo && prevTo.toLowerCase()
        if (currentAddress !== scannedAddress) {
          updateSendTo(scannedAddress)
          updateGas = true
          // Clean up QR code data after handling
          qrCodeDetected(null)
        }
      }
    }

    if (updateGas) {
      if (scannedAddress) {
        this.updateGas({ to: scannedAddress })
      } else {
        this.updateGas()
      }
    }
  }

  componentDidMount () {
    this.props.fetchBasicGasEstimates()
      .then(() => {
        this.updateGas()
      })
  }

  UNSAFE_componentWillMount () {
    this.updateSendToken()

    // Show QR Scanner modal  if ?scan=true
    if (window.location.search === '?scan=true') {
      this.props.scanQrCode()

      // Clear the queryString param after showing the modal
      const cleanUrl = window.location.href.split('?')[0]
      window.history.pushState({}, null, `${cleanUrl}`)
      window.location.hash = '#send'
    }
  }

  componentWillUnmount () {
    this.props.resetSendState()
  }

  onRecipientInputChange = (query) => {
    if (query) {
      this.dValidate(query)
    } else {
      this.validate(query)
    }

    this.setState({
      query,
    })
  }

  validate (query) {
    const {
      hasHexData,
      tokens,
      sendToken,
      network,
    } = this.props

    if (!query) {
      this.setState({ toError: '', toWarning: '' })
      return
    }

    const toErrorObject = getToErrorObject(query, hasHexData, network)
    const toWarningObject = getToWarningObject(query, tokens, sendToken)

    this.setState({
      toError: toErrorObject.to,
      toWarning: toWarningObject.to,
    })
  }

  updateSendToken () {
    const {
      from: { address },
      sendToken,
      tokenContract,
      updateSendTokenBalance,
    } = this.props

    updateSendTokenBalance({
      sendToken,
      tokenContract,
      address,
    })
  }

  updateGas ({ to: updatedToAddress, amount: value, data } = {}) {
    const {
      amount,
      blockGasLimit,
      editingTransactionId,
      gasLimit,
      gasPrice,
      selectedAddress,
      sendToken,
      to: currentToAddress,
      updateAndSetGasLimit,
    } = this.props

    updateAndSetGasLimit({
      blockGasLimit,
      editingTransactionId,
      gasLimit,
      gasPrice,
      selectedAddress,
      sendToken,
      to: getToAddressForGasUpdate(updatedToAddress, currentToAddress),
      value: value || amount,
      data,
    })
  }

  render () {
    const { history, to } = this.props
    let content

    if (to) {
      content = this.renderSendContent()
    } else {
      content = this.renderAddRecipient()
    }

    return (
      <div className="page-container">
        <SendHeader history={history} />
        { this.renderInput() }
        { content }
      </div>
    )
  }

  renderInput () {
    return (
      <EnsInput
        className="send__to-row"
        scanQrCode={(_) => {
          this.context.metricsEvent({
            eventOpts: {
              category: 'Transactions',
              action: 'Edit Screen',
              name: 'Used QR scanner',
            },
          })
          this.props.scanQrCode()
        }}
        onChange={this.onRecipientInputChange}
        onValidAddressTyped={(address) => this.props.updateSendTo(address, '')}
        onPaste={(text) => {
          this.props.updateSendTo(text) && this.updateGas()
        }}
        onReset={() => this.props.updateSendTo('', '')}
        updateEnsResolution={this.props.updateSendEnsResolution}
        updateEnsResolutionError={this.props.updateSendEnsResolutionError}
      />
    )
  }

  renderAddRecipient () {
    const { toError } = this.state
    return (
      <AddRecipient
        updateGas={({ to, amount, data } = {}) => this.updateGas({ to, amount, data })}
        query={this.state.query}
        toError={toError}
      />
    )
  }

  renderSendContent () {
    const { history, showHexData } = this.props
    const { toWarning } = this.state

    return [
      <SendContent
        key="send-content"
        updateGas={({ to, amount, data } = {}) => this.updateGas({ to, amount, data })}
        showHexData={showHexData}
        warning={toWarning}
      />,
      <SendFooter key="send-footer" history={history} />,
    ]
  }

}