import React from 'react';
import { connect } from 'react-redux';
import classnames from 'classnames';
import { Map as makeMap, List as makeList } from 'immutable';

import { clickNode, enterNode, leaveNode } from '../actions/app-actions';
import { getNodeColor } from '../utils/color-utils';
import MatchedText from '../components/matched-text';
import MatchedResults from '../components/matched-results';
import { NODE_BASE_SIZE } from '../constants/styles';

import NodeShapeCircle from './node-shape-circle';
import NodeShapeStack from './node-shape-stack';
import NodeShapeRoundedSquare from './node-shape-rounded-square';
import NodeShapeHexagon from './node-shape-hexagon';
import NodeShapeHeptagon from './node-shape-heptagon';
import NodeShapeCloud from './node-shape-cloud';
import NodeNetworksOverlay from './node-networks-overlay';


const labelWidth = 1.2 * NODE_BASE_SIZE;
const nodeShapes = {
  circle: NodeShapeCircle,
  hexagon: NodeShapeHexagon,
  heptagon: NodeShapeHeptagon,
  square: NodeShapeRoundedSquare,
  cloud: NodeShapeCloud
};

function stackedShape(Shape) {
  const factory = React.createFactory(NodeShapeStack);
  return props => factory(Object.assign({}, props, {shape: Shape}));
}

function getNodeShape({ shape, stack }) {
  const nodeShape = nodeShapes[shape];
  if (!nodeShape) {
    throw new Error(`Unknown shape: ${shape}!`);
  }
  return stack ? stackedShape(nodeShape) : nodeShape;
}


class Node extends React.Component {
  constructor(props, context) {
    super(props, context);
    this.state = {
      hovered: false,
    };

    this.handleMouseClick = this.handleMouseClick.bind(this);
    this.handleMouseEnter = this.handleMouseEnter.bind(this);
    this.handleMouseLeave = this.handleMouseLeave.bind(this);
    this.saveShapeRef = this.saveShapeRef.bind(this);
  }

  renderSvgLabels(labelClassName, labelMinorClassName, labelOffsetY) {
    const { label, labelMinor } = this.props;
    return (
      <g className="node-labels-container">
        <text className={labelClassName} y={13 + labelOffsetY} textAnchor="middle">{label}</text>
        <text className={labelMinorClassName} y={30 + labelOffsetY} textAnchor="middle">
          {labelMinor}
        </text>
      </g>
    );
  }

  renderStandardLabels(labelClassName, labelMinorClassName, labelOffsetY, mouseEvents) {
    const { label, labelMinor, matches = makeMap() } = this.props;
    const matchedMetadata = matches.get('metadata', makeList());
    const matchedParents = matches.get('parents', makeList());
    const matchedNodeDetails = matchedMetadata.concat(matchedParents);

    return (
      <foreignObject
        className="node-labels-container"
        y={labelOffsetY}
        x={-0.5 * labelWidth}
        width={labelWidth}
        height="5em">
        <div className="node-label-wrapper" {...mouseEvents}>
          <div className={labelClassName}>
            <MatchedText text={label} match={matches.get('label')} />
          </div>
          <div className={labelMinorClassName}>
            <MatchedText text={labelMinor} match={matches.get('labelMinor')} />
          </div>
          <MatchedResults matches={matchedNodeDetails} />
        </div>
      </foreignObject>
    );
  }

  render() {
    const { focused, highlighted, networks, pseudo, rank, label, transform,
      exportingGraph, showingNetworks, stack, id, metric } = this.props;
    const { hovered } = this.state;

    const color = getNodeColor(rank, label, pseudo);
    const truncate = !focused && !hovered;
    const labelOffsetY = (showingNetworks && networks) ? 40 : 28;

    const nodeClassName = classnames('node', { highlighted, hovered, pseudo });
    const labelClassName = classnames('node-label', { truncate });
    const labelMinorClassName = classnames('node-label-minor', { truncate });

    const NodeShapeType = getNodeShape(this.props);
    const mouseEvents = {
      onClick: this.handleMouseClick,
      onMouseEnter: this.handleMouseEnter,
      onMouseLeave: this.handleMouseLeave,
    };

    return (
      <g className={nodeClassName} transform={transform}>
        {exportingGraph ?
          this.renderSvgLabels(labelClassName, labelMinorClassName, labelOffsetY) :
          this.renderStandardLabels(labelClassName, labelMinorClassName, labelOffsetY, mouseEvents)}

        <g {...mouseEvents} ref={this.saveShapeRef}>
          <NodeShapeType
            id={id}
            highlighted={highlighted}
            color={color}
            metric={metric}
            contrastMode={this.props.contrastMode}
          />
        </g>

        {showingNetworks && <NodeNetworksOverlay networks={networks} stack={stack} />}
      </g>
    );
  }

  saveShapeRef(ref) {
    this.shapeRef = ref;
  }

  handleMouseClick(ev) {
    ev.stopPropagation();
    this.props.clickNode(this.props.id, this.props.label, this.shapeRef.getBoundingClientRect());
  }

  handleMouseEnter() {
    this.props.enterNode(this.props.id);
    this.setState({ hovered: true });
  }

  handleMouseLeave() {
    this.props.leaveNode(this.props.id);
    this.setState({ hovered: false });
  }
}

function mapStateToProps(state) {
  return {
    exportingGraph: state.get('exportingGraph'),
    showingNetworks: state.get('showingNetworks'),
    contrastMode: state.get('contrastMode')
  };
}

export default connect(
  mapStateToProps,
  { clickNode, enterNode, leaveNode }
)(Node);