// @flow
import React, { Fragment } from 'react';
import { isNameValid } from 'lbry-redux';
import { FormField } from 'component/common/form';
import BusyIndicator from 'component/common/busy-indicator';
import Button from 'component/button';
import analytics from 'analytics';

import { CHANNEL_NEW, MINIMUM_PUBLISH_BID, INVALID_NAME_ERROR } from 'constants/claim';

type Props = {
  channel: string, // currently selected channel
  channels: ?Array<ChannelClaim>,
  balance: number,
  onChannelChange: string => void,
  createChannel: (string, number) => Promise<any>,
  fetchChannelListMine: () => void,
  fetchingChannels: boolean,
  emailVerified: boolean,
  onSuccess: () => void,
};

type State = {
  newChannelName: string,
  newChannelBid: number,
  addingChannel: boolean,
  creatingChannel: boolean,
  newChannelNameError: string,
  newChannelBidError: string,
  createChannelError: ?string,
};

class ChannelCreate extends React.PureComponent<Props, State> {
  constructor(props: Props) {
    super(props);

    this.state = {
      newChannelName: '',
      newChannelBid: 0.1,
      addingChannel: false,
      creatingChannel: false,
      newChannelNameError: '',
      newChannelBidError: '',
      createChannelError: undefined,
    };

    (this: any).handleChannelChange = this.handleChannelChange.bind(this);
    (this: any).handleNewChannelNameChange = this.handleNewChannelNameChange.bind(this);
    (this: any).handleNewChannelBidChange = this.handleNewChannelBidChange.bind(this);
    (this: any).handleCreateChannelClick = this.handleCreateChannelClick.bind(this);
  }

  handleChannelChange(event: SyntheticInputEvent<*>) {
    const { onChannelChange } = this.props;
    const { newChannelBid } = this.state;
    const channel = event.target.value;

    if (channel === CHANNEL_NEW) {
      this.setState({ addingChannel: true });
      onChannelChange(channel);
      this.handleNewChannelBidChange(newChannelBid);
    } else {
      this.setState({ addingChannel: false });
      onChannelChange(channel);
    }
  }

  handleNewChannelNameChange(event: SyntheticInputEvent<*>) {
    let newChannelName = event.target.value;

    if (newChannelName.startsWith('@')) {
      newChannelName = newChannelName.slice(1);
    }

    let newChannelNameError;
    if (newChannelName.length > 0 && !isNameValid(newChannelName, false)) {
      newChannelNameError = INVALID_NAME_ERROR;
    }

    this.setState({
      newChannelNameError,
      newChannelName,
    });
  }

  handleNewChannelBidChange(newChannelBid: number) {
    const { balance } = this.props;
    let newChannelBidError;
    if (newChannelBid === 0) {
      newChannelBidError = __('Your deposit cannot be 0');
    } else if (newChannelBid === balance) {
      newChannelBidError = __('Please decrease your deposit to account for transaction fees');
    } else if (newChannelBid > balance) {
      newChannelBidError = __('Deposit cannot be higher than your balance');
    } else if (newChannelBid < MINIMUM_PUBLISH_BID) {
      newChannelBidError = __('Your deposit must be higher');
    }

    this.setState({
      newChannelBid,
      newChannelBidError,
    });
  }

  handleCreateChannelClick() {
    const { balance, createChannel, onChannelChange } = this.props;
    const { newChannelBid, newChannelName } = this.state;

    const channelName = `@${newChannelName.trim()}`;

    if (newChannelBid > balance) {
      return;
    }

    this.setState({
      creatingChannel: true,
      createChannelError: undefined,
    });

    const success = channelClaim => {
      this.setState({
        creatingChannel: false,
        addingChannel: false,
      });
      analytics.apiLogPublish(channelClaim);
      onChannelChange(channelName);
      this.props.onSuccess();
    };

    const failure = () => {
      this.setState({
        creatingChannel: false,
        createChannelError: __('Unable to create channel due to an internal error.'),
      });
    };

    createChannel(channelName, newChannelBid).then(success, failure);
  }

  render() {
    const {
      newChannelName,
      newChannelNameError,
      newChannelBid,
      newChannelBidError,
      creatingChannel,
      createChannelError,
    } = this.state;

    return (
      <Fragment>
        {createChannelError && <div className="error-text">{createChannelError}</div>}
        <div>
          <FormField
            label={__('Name')}
            name="channel-input"
            type="text"
            placeholder={__('ChannelName')}
            error={newChannelNameError}
            value={newChannelName}
            onChange={this.handleNewChannelNameChange}
          />
          <FormField
            className="form-field--price-amount"
            name="channel-deposit"
            label={__('Deposit (LBC)')}
            step="any"
            min="0"
            type="number"
            helper={__('This LBC remains yours. It is a deposit to reserve the name and can be undone at any time.')}
            error={newChannelBidError}
            value={newChannelBid}
            onChange={event => this.handleNewChannelBidChange(parseFloat(event.target.value))}
          />
          <div className="card__actions">
            <Button
              button="primary"
              label={!creatingChannel ? __('Create channel') : __('Creating channel...')}
              onClick={this.handleCreateChannelClick}
              disabled={
                !newChannelName || !newChannelBid || creatingChannel || newChannelNameError || newChannelBidError
              }
            />
          </div>
        </div>
        {creatingChannel && <BusyIndicator message={`Creating Channel ${newChannelName}...`} />}
      </Fragment>
    );
  }
}

export default ChannelCreate;