// @flow
import React, { PureComponent } from 'react';
import styled from 'styled-components';
import { BigNumber } from 'bignumber.js';

import FEES from '../constants/fees';

import { InputLabelComponent } from '../components/input-label';
import { InputComponent } from '../components/input';
import { TextComponent } from '../components/text';
import { SelectComponent } from '../components/select';
import { RowComponent } from '../components/row';
import { ColumnComponent } from '../components/column';
import { Divider } from '../components/divider';
import { Button } from '../components/button';

import formatNumber from '../utils/formatNumber';

import type { SendTransactionInput } from '../containers/send';
import type { State as SendState } from '../redux/modules/send';

const FormWrapper = styled.div`
  margin-top: ${props => props.theme.layoutContentPaddingTop};
  width: 71%;
`;

const SendWrapper = styled(ColumnComponent)`
  margin-top: 60px;
  width: 25%;
`;

const ShowFeeButton = styled.button`
  background: none;
  border: none;
  cursor: pointer;
  width: 100%;
  color: ${props => props.theme.colors.text};
  outline: none;

  &:hover {
    text-decoration: underline;
  }
`;

const InfoCard = styled.div`
  width: 100%;
  background-color: ${props => props.theme.colors.cardBackgroundColor};
  border-radius: ${props => props.theme.boxBorderRadius};
`;

const InfoContent = styled.div`
  padding: 15px;
`;

const InfoCardLabel = styled(TextComponent)`
  opacity: 0.5;
  margin-bottom: 10px;
`;

const InfoCardUSD = styled(TextComponent)`
  opacity: 0.5;
  margin-top: 2.5px;
`;

const FormButton = styled(Button)`
  margin: 10px 0;
`;

const SuccessWrapper = styled(ColumnComponent)`
  align-items: center;
  justify-content: center;
  height: 100%;
`;

type Props = SendState & {
  balance: number,
  zecPrice: number,
  addresses: string[],
  sendTransaction: SendTransactionInput => void,
  resetSendView: () => void,
};

type State = {
  showFee: boolean,
  from: string,
  amount: string,
  to: string,
  feeType: string | number,
  fee: number | null,
  memo: string,
};

const initialState = {
  showFee: false,
  from: '',
  amount: '0',
  to: '',
  feeType: FEES.LOW,
  fee: FEES.LOW,
  memo: '',
};

export class SendView extends PureComponent<Props, State> {
  state = initialState;

  componentDidMount() {
    const { resetSendView } = this.props;
    resetSendView();
  }

  handleChange = (field: string) => (value: string) => {
    if (field === 'amount') {
      if (value !== '') {
        this.setState(() => ({
          [field]: value,
        }));
      }
    } else {
      this.setState(() => ({ [field]: value }));
    }
  };

  handleChangeFeeType = (value: string) => {
    this.setState(
      {
        feeType: value,
        fee: null,
      },
      () => {
        if (
          value === String(FEES.LOW)
          || value === String(FEES.MEDIUM)
          || value === String(FEES.HIGH)
        ) {
          this.setState(() => ({
            fee: Number(value),
          }));
        }
      },
    );
  };

  handleSubmit = () => {
    const {
      from, amount, to, memo, fee,
    } = this.state;
    const { sendTransaction } = this.props;

    if (!from || !amount || !to || !fee) return;

    sendTransaction({
      from,
      to,
      amount,
      fee,
      memo,
    });
  };

  reset = () => {
    const { resetSendView } = this.props;

    this.setState(initialState, () => resetSendView());
  };

  render() {
    const {
      addresses,
      balance,
      zecPrice,
      isSending,
      error,
      operationId,
    } = this.props;
    const {
      showFee, from, amount, to, memo, fee, feeType,
    } = this.state;

    const zecBalance = formatNumber({ value: balance, append: 'ZEC ' });
    const zecBalanceInUsd = formatNumber({
      value: new BigNumber(balance).times(zecPrice).toNumber(),
      append: 'USD $',
    });
    const valueSent = formatNumber({
      value: new BigNumber(amount).toNumber(),
      append: 'ZEC ',
    });
    const valueSentInUsd = formatNumber({
      value: new BigNumber(amount).times(zecPrice).toNumber(),
      append: 'USD $',
    });

    return operationId ? (
      <SuccessWrapper id='send-success-wrapper'>
        <TextComponent value={`Processing operation: ${operationId}`} />
        <TextComponent value={`Amount: ${amount}`} />
        <TextComponent value={`From: ${from}`} />
        <TextComponent value={`To: ${to}`} />
        <button type='button' onClick={this.reset}>
          Send again!
        </button>
      </SuccessWrapper>
    ) : (
      <RowComponent id='send-wrapper' justifyContent='space-between'>
        <FormWrapper>
          {error && <TextComponent id='send-error-text' value={error} />}
          <InputLabelComponent value='From' />
          <SelectComponent
            onChange={this.handleChange('from')}
            value={from}
            placeholder='Select a address'
            options={addresses.map(addr => ({ value: addr, label: addr }))}
          />
          <InputLabelComponent value='Amount' />
          <InputComponent
            name='amount'
            type='number'
            onChange={this.handleChange('amount')}
            value={String(amount)}
            placeholder='ZEC 0.0'
            step={0.01}
          />
          <InputLabelComponent value='To' />
          <InputComponent
            onChange={this.handleChange('to')}
            value={to}
            placeholder='Enter Address'
            name='to'
          />
          <InputLabelComponent value='Memo' />
          <InputComponent
            onChange={this.handleChange('memo')}
            value={memo}
            inputType='textarea'
            placeholder='Enter a text here'
            name='memo'
          />
          <ShowFeeButton
            id='send-show-additional-options-button'
            onClick={() => this.setState(state => ({ showFee: !state.showFee }))
            }
          >
            <TextComponent
              paddingTop='10px'
              value={`${showFee ? 'Hide' : 'Show'} Additional Options`}
              align='right'
            />
          </ShowFeeButton>
          {showFee && (
            <RowComponent
              id='send-fee-wrapper'
              alignItems='flex-end'
              justifyContent='space-between'
            >
              <ColumnComponent width='74%'>
                <InputLabelComponent value='Fee' />
                <InputComponent
                  type='number'
                  onChange={this.handleChange('fee')}
                  value={String(fee)}
                  disabled={feeType !== FEES.CUSTOM}
                  name='fee'
                />
              </ColumnComponent>
              <ColumnComponent width='25%'>
                <SelectComponent
                  onChange={this.handleChangeFeeType}
                  value={String(feeType)}
                  options={Object.keys(FEES).map(cur => ({
                    label: cur.toLowerCase(),
                    value: String(FEES[cur]),
                  }))}
                  placement='top'
                />
              </ColumnComponent>
            </RowComponent>
          )}
          {feeType === FEES.CUSTOM && (
            <TextComponent value='Custom fees may compromise your privacy since fees are transparent' />
          )}
        </FormWrapper>
        <SendWrapper>
          <InfoCard>
            <InfoContent>
              <InfoCardLabel value='Available Funds:' />
              <TextComponent value={zecBalance} size={1.25} isBold />
              <InfoCardUSD value={zecBalanceInUsd} size={0.84375} />
            </InfoContent>
            <Divider opacity={0.5} />
            <InfoContent>
              <InfoCardLabel value='Sending' />
              <TextComponent value={valueSent} size={1.25} isBold />
              <InfoCardUSD value={valueSentInUsd} size={0.84375} />
            </InfoContent>
          </InfoCard>
          <FormButton
            id='send-submit-button'
            label='Send'
            variant='secondary'
            focused
            onClick={this.handleSubmit}
            isLoading={isSending}
            disabled={!from || !amount || !to || !fee}
          />
          <FormButton label='Cancel' variant='secondary' />
        </SendWrapper>
      </RowComponent>
    );
  }
}