// 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 } from 'react';
import PropTypes from 'prop-types';
import { FormattedMessage } from 'react-intl';
import { connect } from 'react-redux';
import { bindActionCreators } from 'redux';

import { updateBackground } from '@parity/shared/redux/providers/settings/actions';
import { Button, Container, ParityBackground } from '@parity/ui';
import { RefreshIcon } from '@parity/ui/Icons';

import layout from '../layout.css';
import styles from './background.css';

let counter = 0;

class Background extends Component {
  static contextTypes = {
    api: PropTypes.object.isRequired
  }

  static propTypes = {
    settings: PropTypes.object.isRequired,
    updateBackground: PropTypes.func.isRequired
  }

  state = {
    seeds: []
  }

  componentDidMount () {
    const { settings } = this.props;
    const seeds = new Array(20).fill(null);

    seeds[0] = settings.backgroundSeed;

    this.setState({
      seeds
    }, () => this.generateSeeds());
  }

  render () {
    return (
      <Container
        title={
          <FormattedMessage id='settings.background.label' />
        }
      >
        <div className={ layout.layout }>
          <div className={ layout.overview }>
            <div>
              <FormattedMessage
                id='settings.background.overview_0'
                defaultMessage='The background pattern you can see right now is unique to your Parity installation. It will change every time you create a new Signer token. This is so that decentralized applications cannot pretend to be trustworthy.'
              />
            </div>
            <div>
              <FormattedMessage
                id='settings.background.overview_1'
                defaultMessage='Pick a pattern you like and memorize it. This Pattern will always be shown from now on, unless you clear your browser cache or use a new Signer token.'
              />
            </div>
            <div>
              <Button
                icon={ <RefreshIcon /> }
                label={
                  <FormattedMessage
                    id='settings.background.button_more'
                    defaultMessage='generate more'
                  />
                }
                onClick={ this.generateSeeds }
              />
            </div>
          </div>
          <div className={ layout.details }>
            <div className={ styles.bgcontainer }>
              { this.renderBackgrounds() }
            </div>
          </div>
        </div>
      </Container>
    );
  }

  renderBackgrounds () {
    const { settings } = this.props;
    const { seeds } = this.state;

    return seeds.map((seed, index) => {
      return (
        <div className={ styles.bgflex } key={ index }>
          <div className={ styles.bgseed }>
            <ParityBackground
              className={ settings.backgroundSeed === seed ? styles.seedactive : styles.seed }
              seed={ seed }
              onClick={ this.onSelect(seed) }
            />
          </div>
        </div>
      );
    });
  }

  onSelect = (seed) => {
    const { updateBackground } = this.props;

    return (event) => {
      updateBackground(seed);
    };
  }

  generateSeeds = () => {
    const { seeds } = this.state;
    const current = this.props.settings.backgroundSeed;

    const newSeeds = seeds.map((seed) => {
      if (seed === current) {
        return seed;
      }

      return this.generateSeed();
    });

    this.setState({
      seeds: newSeeds
    });
  }

  generateSeed () {
    const { api } = this.context;

    return api.util.sha3.text(`${Math.random()}${counter++}`);
  }
}

function mapStateToProps (state) {
  const { settings } = state;

  return { settings };
}

function mapDispatchToProps (dispatch) {
  return bindActionCreators({ updateBackground }, dispatch);
}

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