MyCrypto/common/containers/Tabs/Swap/components/CurrencySwap.jsx

import './CurrencySwap.scss';
import React, { Component } from 'react';
import translate from 'translations';
import { combineAndUpper } from 'utils/formatters';
import SimpleSelect from 'components/ui/SimpleSelect';
import SimpleButton from 'components/ui/SimpleButton';
import type {
  OriginKindSwapAction,
  DestinationKindSwapAction,
  OriginAmountSwapAction,
  DestinationAmountSwapAction,
  ChangeStepSwapAction
} from 'actions/swapTypes';
import bityConfig, { kindMin, kindMax } from 'config/bity';
import { toFixedIfLarger } from 'utils/formatters';

export type StateProps = {
  bityRates: {},
  originAmount: ?number,
  destinationAmount: ?number,
  originKind: string,
  destinationKind: string,
  destinationKindOptions: String[],
  originKindOptions: String[]
};

export type ActionProps = {
  originKindSwap: (value: string) => OriginKindSwapAction,
  destinationKindSwap: (value: string) => DestinationKindSwapAction,
  originAmountSwap: (value: ?number) => OriginAmountSwapAction,
  destinationAmountSwap: (value: ?number) => DestinationAmountSwapAction,
  changeStepSwap: () => ChangeStepSwapAction,
  showNotification: Function
};

export default class CurrencySwap extends Component {
  props: StateProps & ActionProps;

  state = {
    disabled: true,
    showedMinMaxError: false
  };

  isMinMaxValid = (amount, kind) => {
    let bityMin;
    let bityMax;
    if (kind !== 'BTC') {
      const bityPairRate = this.props.bityRates['BTC' + kind];
      bityMin = kindMin(bityPairRate, kind);
      bityMax = kindMax(bityPairRate, kind);
    } else {
      bityMin = bityConfig.BTCMin;
      bityMax = bityConfig.BTCMax;
    }
    let higherThanMin = amount >= bityMin;
    let lowerThanMax = amount <= bityMax;
    return higherThanMin && lowerThanMax;
  };

  isDisabled = (originAmount, originKind, destinationAmount) => {
    const hasOriginAmountAndDestinationAmount =
      originAmount && destinationAmount;
    const minMaxIsValid = this.isMinMaxValid(originAmount, originKind);
    return !(hasOriginAmountAndDestinationAmount && minMaxIsValid);
  };

  setDisabled(originAmount, originKind, destinationAmount) {
    const disabled = this.isDisabled(
      originAmount,
      originKind,
      destinationAmount
    );

    if (disabled && originAmount && !this.state.showedMinMaxError) {
      const { bityRates } = this.props;
      const ETHMin = kindMin(bityRates.BTCETH, 'ETH');
      const ETHMax = kindMax(bityRates.BTCETH, 'ETH');
      const REPMin = kindMin(bityRates.BTCREP, 'REP');

      const notificationMessage = `
        Minimum amount ${bityConfig.BTCMin} BTC,
        ${toFixedIfLarger(ETHMin, 3)} ETH.
        Max amount ${bityConfig.BTCMax} BTC,
        ${toFixedIfLarger(ETHMax, 3)} ETH, or
        ${toFixedIfLarger(REPMin, 3)} REP
      `;

      this.setState(
        {
          disabled: disabled,
          showedMinMaxError: true
        },
        () => {
          this.props.showNotification('danger', notificationMessage, 10000);
        }
      );
    } else {
      this.setState({
        disabled: disabled
      });
    }
  }

  onClickStartSwap = () => {
    this.props.changeStepSwap(2);
  };

  setOriginAndDestinationToNull = () => {
    this.props.originAmountSwap(null);
    this.props.destinationAmountSwap(null);
    this.setDisabled(null, this.props.originKind, null);
  };

  onChangeOriginAmount = (event: SyntheticInputEvent) => {
    const { destinationKind, originKind } = this.props;
    const amount = event.target.value;
    let originAmountAsNumber = parseFloat(amount);
    if (originAmountAsNumber || originAmountAsNumber === 0) {
      let pairName = combineAndUpper(originKind, destinationKind);
      let bityRate = this.props.bityRates[pairName];
      this.props.originAmountSwap(originAmountAsNumber);
      let destinationAmount = originAmountAsNumber * bityRate;
      this.props.destinationAmountSwap(destinationAmount);
      this.setDisabled(originAmountAsNumber, originKind, destinationAmount);
    } else {
      this.setOriginAndDestinationToNull();
    }
  };

  onChangeDestinationAmount = (event: SyntheticInputEvent) => {
    const { destinationKind, originKind } = this.props;
    const amount = event.target.value;
    let destinationAmountAsNumber = parseFloat(amount);
    if (destinationAmountAsNumber || destinationAmountAsNumber === 0) {
      this.props.destinationAmountSwap(destinationAmountAsNumber);
      let pairNameReversed = combineAndUpper(destinationKind, originKind);
      let bityRate = this.props.bityRates[pairNameReversed];
      let originAmount = destinationAmountAsNumber * bityRate;
      this.props.originAmountSwap(originAmount, originKind);
      this.setDisabled(originAmount, originKind, destinationAmountAsNumber);
    } else {
      this.setOriginAndDestinationToNull();
    }
  };

  onChangeDestinationKind = (event: SyntheticInputEvent) => {
    let newDestinationKind = event.target.value;
    this.props.destinationKindSwap(newDestinationKind);
  };

  onChangeOriginKind = (event: SyntheticInputEvent) => {
    let newOriginKind = event.target.value;
    this.props.originKindSwap(newOriginKind);
  };

  render() {
    const {
      originAmount,
      destinationAmount,
      originKind,
      destinationKind,
      destinationKindOptions,
      originKindOptions
    } = this.props;

    return (
      <article className="CurrencySwap">
        <h1 className="CurrencySwap-title">
          {translate('SWAP_init_1')}
        </h1>

        <div className="form-inline">
          <input
            className={`CurrencySwap-input form-control ${originAmount !== '' &&
            this.isMinMaxValid(originAmount, originKind)
              ? 'is-valid'
              : 'is-invalid'}`}
            type="number"
            placeholder="Amount"
            value={
              parseFloat(originAmount) === 0 ? originAmount : originAmount || ''
            }
            onChange={this.onChangeOriginAmount}
          />

          <SimpleSelect
            value={originKind}
            onChange={this.onChangeOriginKind.bind(this)}
            options={originKindOptions}
          />

          <h1 className="CurrencySwap-divider">
            {translate('SWAP_init_2')}
          </h1>

          <input
            className={`CurrencySwap-input form-control ${destinationAmount !==
              '' && this.isMinMaxValid(originAmount, originKind)
              ? 'is-valid'
              : 'is-invalid'}`}
            type="number"
            placeholder="Amount"
            value={
              parseFloat(destinationAmount) === 0
                ? destinationAmount
                : destinationAmount || ''
            }
            onChange={this.onChangeDestinationAmount}
          />

          <SimpleSelect
            value={destinationKind}
            onChange={this.onChangeDestinationKind}
            options={destinationKindOptions}
          />
        </div>

        <div className="CurrencySwap-submit">
          <SimpleButton
            onClick={this.onClickStartSwap}
            text={translate('SWAP_init_CTA')}
            disabled={this.state.disabled}
            type="info"
          />
        </div>
      </article>
    );
  }
}