// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.

// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Parity.  If not, see <http://www.gnu.org/licenses/>.

import React, { Component, PropTypes } from 'react';
import { connect } from 'react-redux';
import { bindActionCreators } from 'redux';
import { Card, CardHeader, CardText } from 'material-ui/Card';
import TextField from 'material-ui/TextField';
import DropDownMenu from 'material-ui/DropDownMenu';
import MenuItem from 'material-ui/MenuItem';
import RaisedButton from 'material-ui/RaisedButton';
import CheckIcon from 'material-ui/svg-icons/navigation/check';

import { nullableProptype } from '@parity/shared/util/proptypes';

import { fromWei } from '../parity.js';

import { clearError, reserve, drop } from './actions';
import styles from './names.css';

const useSignerText = (<p>Use the <a href='/#/signer' className={ styles.link } target='_blank'>Signer</a> to authenticate the following changes.</p>);

const renderNames = (names) => {
  const values = Object.values(names);

  return values
    .map((name, index) => (
      <span key={ index }>
        <code>{ name }</code>
        {
          index < values.length - 1
          ? (<span>, </span>)
          : null
        }
      </span>
    ));
};

const renderQueue = (queue) => {
  if (queue.length === 0) {
    return null;
  }

  const grouped = queue.reduce((grouped, change) => {
    const last = grouped[grouped.length - 1];

    if (last && last.action === change.action) {
      last.names.push(change.name);
    } else {
      grouped.push({ action: change.action, names: [change.name] });
    }
    return grouped;
  }, []);

  return (
    <ul>
      { grouped.map(({ action, names }) => (
        <li key={ action + '-' + names.join('-') }>
          { renderNames(names) }
          { ' will be ' }
          { action === 'reserve' ? 'reserved' : 'dropped' }
        </li>
      )) }
    </ul>
  );
};

class Names extends Component {
  static propTypes = {
    error: nullableProptype(PropTypes.object.isRequired),
    fee: PropTypes.object.isRequired,
    pending: PropTypes.bool.isRequired,
    queue: PropTypes.array.isRequired,

    clearError: PropTypes.func.isRequired,
    reserve: PropTypes.func.isRequired,
    drop: PropTypes.func.isRequired
  };

  state = {
    action: 'reserve',
    name: ''
  };

  render () {
    const { action, name } = this.state;
    const { fee, pending, queue } = this.props;

    return (
      <Card className={ styles.names }>
        <CardHeader title={ 'Manage Names' } />
        <CardText>
          { (action === 'reserve'
              ? (<p className={ styles.noSpacing }>
                The fee to reserve a name is <code>{ fromWei(fee).toFixed(3) }</code>ETH.
              </p>)
              : (<p className={ styles.noSpacing }>To drop a name, you have to be the owner.</p>)
            )
          }
          { this.renderError() }
          <div className={ styles.box }>
            <TextField
              hintText='name'
              value={ name }
              onChange={ this.onNameChange }
            />
            <DropDownMenu
              disabled={ pending }
              value={ action }
              onChange={ this.onActionChange }
            >
              <MenuItem value='reserve' primaryText='reserve this name' />
              <MenuItem value='drop' primaryText='drop this name' />
            </DropDownMenu>
            <RaisedButton
              disabled={ pending }
              className={ styles.spacing }
              label={ action === 'reserve' ? 'Reserve' : 'Drop' }
              primary
              icon={ <CheckIcon /> }
              onTouchTap={ this.onSubmitClick }
            />
          </div>
          { queue.length > 0
            ? (<div>{ useSignerText }{ renderQueue(queue) }</div>)
            : null
          }
        </CardText>
      </Card>
    );
  }

  renderError () {
    const { error } = this.props;

    if (!error) {
      return null;
    }

    return (
      <div className={ styles.error }>
        <code>{ error.message }</code>
      </div>
    );
  }

  onNameChange = (e) => {
    this.clearError();
    this.setState({ name: e.target.value });
  };

  onActionChange = (e, i, action) => {
    this.clearError();
    this.setState({ action });
  };

  onSubmitClick = () => {
    const { action, name } = this.state;

    if (action === 'reserve') {
      return this.props.reserve(name);
    }

    if (action === 'drop') {
      return this.props.drop(name);
    }
  };

  clearError = () => {
    if (this.props.error) {
      this.props.clearError();
    }
  };
}

const mapStateToProps = (state) => ({ ...state.names, fee: state.fee });
const mapDispatchToProps = (dispatch) => bindActionCreators({ clearError, reserve, drop }, dispatch);

export default connect(mapStateToProps, mapDispatchToProps)(Names);