import React, { Component } from 'react'
import PropTypes from 'prop-types'
import classnames from 'classnames'

import { debounce } from 'lodash'
import copyToClipboard from 'copy-to-clipboard/index'
import ENS from 'ethjs-ens'
import networkMap from 'ethereum-ens-network-map'
import log from 'loglevel'
import { ellipsify } from '../../send.utils'
import { isValidDomainName, isValidAddress, isValidAddressHead } from '../../../../helpers/utils/util'
import { MAINNET_NETWORK_ID } from '../../../../../../app/scripts/controllers/network/enums'

// Local Constants
const ZERO_ADDRESS = '0x0000000000000000000000000000000000000000'
const ZERO_X_ERROR_ADDRESS = '0x'

export default class EnsInput extends Component {
  static contextTypes = {
    t: PropTypes.func,
  }

  static propTypes = {
    className: PropTypes.string,
    network: PropTypes.string,
    selectedAddress: PropTypes.string,
    selectedName: PropTypes.string,
    onChange: PropTypes.func,
    updateEnsResolution: PropTypes.func,
    scanQrCode: PropTypes.func,
    updateEnsResolutionError: PropTypes.func,
    onPaste: PropTypes.func,
    onReset: PropTypes.func,
    onValidAddressTyped: PropTypes.func,
    contact: PropTypes.object,
    value: PropTypes.string,
  }

  state = {
    input: '',
    toError: null,
    ensResolution: undefined,
  }

  componentDidMount () {
    const { network } = this.props
    const networkHasEnsSupport = getNetworkEnsSupport(network)
    this.setState({ ensResolution: ZERO_ADDRESS })

    if (networkHasEnsSupport) {
      const provider = global.ethereumProvider
      this.ens = new ENS({ provider, network })
      this.checkName = debounce(this.lookupEnsName, 200)
    }
  }

  componentDidUpdate (prevProps) {
    const {
      input,
    } = this.state
    const {
      network,
      value,
    } = this.props

    // Update the value in state if its prop value changes
    if (input !== value) {
      this.setState({ input: value })
    }

    // If an address is sent without a nickname, meaning not from ENS or from
    // the user's own accounts, a default of a one-space string is used.
    if (prevProps.network !== network) {
      const provider = global.ethereumProvider
      this.ens = new ENS({ provider, network })
      this.onChange({ target: { value: input } })
    }
  }

  resetInput = () => {
    const { updateEnsResolution, updateEnsResolutionError, onReset } = this.props
    this.onChange({ target: { value: '' } })
    onReset()
    updateEnsResolution('')
    updateEnsResolutionError('')
  }

  lookupEnsName = (ensName) => {
    const { network } = this.props
    const recipient = ensName.trim()

    log.info(`ENS attempting to resolve name: ${recipient}`)
    this.ens.lookup(recipient)
      .then((address) => {
        if (address === ZERO_ADDRESS) {
          throw new Error(this.context.t('noAddressForName'))
        }
        if (address === ZERO_X_ERROR_ADDRESS) {
          throw new Error(this.context.t('ensRegistrationError'))
        }
        this.props.updateEnsResolution(address)
      })
      .catch((reason) => {
        if (isValidDomainName(recipient) && reason.message === 'ENS name not defined.') {
          this.props.updateEnsResolutionError(network === MAINNET_NETWORK_ID ? this.context.t('noAddressForName') : this.context.t('ensNotFoundOnCurrentNetwork'))
        } else {
          log.error(reason)
          this.props.updateEnsResolutionError(reason.message)
        }
      })
  }

  onPaste = (event) => {
    event.clipboardData.items[0].getAsString((text) => {
      if (isValidAddress(text)) {
        this.props.onPaste(text)
      }
    })
  }

  onChange = (e) => {
    const { network, onChange, updateEnsResolution, updateEnsResolutionError, onValidAddressTyped } = this.props
    const input = e.target.value
    const networkHasEnsSupport = getNetworkEnsSupport(network)

    this.setState({ input }, () => onChange(input))

    // Empty ENS state if input is empty
    // maybe scan ENS

    if (!networkHasEnsSupport && !isValidAddress(input) && !isValidAddressHead(input)) {
      updateEnsResolution('')
      updateEnsResolutionError(networkHasEnsSupport ? '' : 'Network does not support ENS')
      return
    }

    if (isValidDomainName(input)) {
      this.lookupEnsName(input)
    } else if (onValidAddressTyped && isValidAddress(input)) {
      onValidAddressTyped(input)
    } else {
      updateEnsResolution('')
      updateEnsResolutionError('')
    }
  }

  render () {
    const { t } = this.context
    const { className, selectedAddress } = this.props
    const { input } = this.state

    if (selectedAddress) {
      return this.renderSelected()
    }

    return (
      <div className={classnames('ens-input', className)}>
        <div
          className={classnames('ens-input__wrapper', {
            'ens-input__wrapper__status-icon--error': false,
            'ens-input__wrapper__status-icon--valid': false,
          })}
        >
          <div className="ens-input__wrapper__status-icon" />
          <input
            className="ens-input__wrapper__input"
            type="text"
            dir="auto"
            placeholder={t('recipientAddressPlaceholder')}
            onChange={this.onChange}
            onPaste={this.onPaste}
            value={selectedAddress || input}
            autoFocus
            data-testid="ens-input"
          />
          <div
            className={classnames('ens-input__wrapper__action-icon', {
              'ens-input__wrapper__action-icon--erase': input,
              'ens-input__wrapper__action-icon--qrcode': !input,
            })}
            onClick={() => {
              if (input) {
                this.resetInput()
              } else {
                this.props.scanQrCode()
              }
            }}
          />
        </div>
      </div>
    )
  }

  renderSelected () {
    const { t } = this.context
    const { className, selectedAddress, selectedName, contact = {} } = this.props
    const name = contact.name || selectedName

    return (
      <div className={classnames('ens-input', className)}>
        <div
          className="ens-input__wrapper ens-input__wrapper--valid"
        >
          <div className="ens-input__wrapper__status-icon ens-input__wrapper__status-icon--valid" />
          <div
            className="ens-input__wrapper__input ens-input__wrapper__input--selected"
            placeholder={t('recipientAddress')}
            onChange={this.onChange}
          >
            <div className="ens-input__selected-input__title">
              {name || ellipsify(selectedAddress)}
            </div>
            { name && <div className="ens-input__selected-input__subtitle">{selectedAddress}</div> }
          </div>
          <div
            className="ens-input__wrapper__action-icon ens-input__wrapper__action-icon--erase"
            onClick={this.resetInput}
          />
        </div>
      </div>
    )
  }

  ensIcon (recipient) {
    const { hoverText } = this.state

    return (
      <span
        className="#ensIcon"
        title={hoverText}
        style={{
          position: 'absolute',
          top: '16px',
          left: '-25px',
        }}
      >
        { this.ensIconContents(recipient) }
      </span>
    )
  }

  ensIconContents () {
    const { loadingEns, ensFailure, ensResolution, toError } = this.state

    if (toError) {
      return null
    }

    if (loadingEns) {
      return (
        <img
          src="images/loading.svg"
          style={{
            width: '30px',
            height: '30px',
            transform: 'translateY(-6px)',
          }}
        />
      )
    }

    if (ensFailure) {
      return <i className="fa fa-warning fa-lg warning'" />
    }

    if (ensResolution && (ensResolution !== ZERO_ADDRESS)) {
      return (
        <i
          className="fa fa-check-circle fa-lg cursor-pointer"
          style={{ color: 'green' }}
          onClick={(event) => {
            event.preventDefault()
            event.stopPropagation()
            copyToClipboard(ensResolution)
          }}
        />
      )
    }

    return null
  }
}

function getNetworkEnsSupport (network) {
  return Boolean(networkMap[network])
}