// Copyright 2015, 2016 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';

class ParityBackground extends Component {
  static contextTypes = {
    muiTheme: PropTypes.object.isRequired
  };

  static propTypes = {
    backgroundSeed: PropTypes.string,
    children: PropTypes.node,
    className: PropTypes.string,
    onClick: PropTypes.func
  };

  state = {
    style: {}
  };

  _seed = null;

  componentWillMount () {
    this.setStyle();
  }

  componentWillReceiveProps (nextProps) {
    this.setStyle(nextProps);
  }

  shouldComponentUpdate (_, nextState) {
    return nextState.style !== this.state.style;
  }

  setStyle (props = this.props) {
    const { seed, gradient, backgroundSeed } = props;

    const _seed = seed || backgroundSeed;

    // Don't update if it's the same seed...
    if (this._seed === _seed) {
      return;
    }

    const { muiTheme } = this.context;

    const style = muiTheme.parity.getBackgroundStyle(gradient, _seed);
    this.setState({ style });
  }

  render () {
    const { children, className, onClick } = this.props;
    const { style } = this.state;

    return (
      <div
        className={ className }
        style={ style }
        onTouchTap={ onClick }
      >
        { children }
      </div>
    );
  }
}

function mapStateToProps (state) {
  const { backgroundSeed } = state.settings;
  return { backgroundSeed };
}

export default connect(
  mapStateToProps
)(ParityBackground);
