import React, { Component, useEffect } from 'react';
import PropTypes from 'prop-types';
import ReactDOM from 'react-dom';
import {Map} from 'immutable';

const grabCircleRadius = 10;
const hoverCircleRadius = 14;
const rulerColor = '#f45c42';
const hoverColor = '#ff9900';

const grabCircleStyle = {
  cursor: 'grab',
  fill: rulerColor,
  transition: 'r 150ms ease-in'
};

const hoverCircleStyle = {
  cursor: 'grab',
  fill: hoverColor,
  transition: 'r 150ms ease-in'
};

const pointsDistance = (x1, y1, x2, y2) => {

  if (
    !isNaN(x1) &&
    !isNaN(y1) &&
    !isNaN(x2) &&
    !isNaN(y2)
  ) {
    if (!(x1 == 0 && y1 == 0 && x2 == 0 && y2 == 0)) {
      return Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2));
    }
  }

  return 0;
};

export default class ImageFul extends Component {
  constructor(props) {
    super(props);

    this.state = {
      handleMouseMove1: false,
      handleMouseMove2: false,
      hover1: false,
      hover2: false,
      imageLoadError: false
    };

    this.onMouseDown = this.onMouseDown.bind(this);
    this.onMouseMove = this.onMouseMove.bind(this);
    this.toggleHover1 = this.toggleHover1.bind(this);
    this.toggleHover2 = this.toggleHover2.bind(this);
  }

  onMouseDown(event) {
    let target = event.viewerEvent.originalEvent.target;

    if (target.nodeName === 'circle') {
      if (target.attributes.name) {
        if (target.attributes.name.nodeValue === 'fst-anchor') {
          this.setState({handleMouseMove1: !this.state.handleMouseMove1});
        }
        else if (target.attributes.name.nodeValue === 'snd-anchor') {
          this.setState({handleMouseMove2: !this.state.handleMouseMove2});
        }
      }
    }
  }

  onMouseMove(event) {
    let {x, y} = event.viewerEvent;

    y = this.props.scene.height - y;

    let dist = pointsDistance(this.props.x1, this.props.y1, this.props.x2, this.props.y2);
    let scale = !isNaN(dist) && dist ? (this.props.distance.length / dist) : 0;

    let origin = {
      x: this.props.element.x - (this.props.width * scale / 2),
      y: this.props.element.y + (this.props.height * scale / 2)
    };

    let minX = origin.x + (this.props.width * scale);
    let minY = origin.y - (this.props.height * scale);

    if (x < origin.x) {
      x = origin.x;
    }
    else if (x > minX) {
      x = minX;
    }

    if (y > origin.y) {
      y = origin.y;
    }
    else if (y < minY) {
      y = minY;
    }

    let newX = (x - origin.x);
    let newY = (origin.y - y);

    if (this.state.handleMouseMove1) {
      let dist = pointsDistance(newX, newY, this.props.x2, this.props.y2);
      this.context.projectActions.setProperties(new Map({x1: newX, y1: newY, distance: new Map({length: dist})}));
    }
    else if (this.state.handleMouseMove2) {
      let dist = pointsDistance(this.props.x1, this.props.y1, newX, newY);
      this.context.projectActions.setProperties(new Map({x2: newX, y2: newY, distance: new Map({length: dist})}));
    }
  }

  componentDidMount() {
    document.addEventListener('mousedown-planner-event', this.onMouseDown);
    document.addEventListener('mousemove-planner-event', this.onMouseMove);

    if (this.props.imageUri) {
      let img = new Image;
      img.src = this.props.imageUri;
      img.onload = () => {
        this.setState({imageLoadError: false});
        this.context.projectActions.setProperties(new Map({width: img.naturalWidth, height: img.naturalHeight}))
      };
      img.onerror = () => {
        this.setState({imageLoadError: true})
      };
    }
  }

  componentWillUnmount() {
    document.removeEventListener('mousedown-planner-event', this.onMouseDown);
    document.removeEventListener('mousemove-planner-event', this.onMouseMove);
  }

  componentWillReceiveProps(nextProps) {

    if (this.props.imageUri !== nextProps.imageUri) {
      let img = new Image;
      img.src = nextProps.imageUri;
      img.onload = () => {
        this.setState({imageLoadError: false});
        this.context.projectActions.setProperties(new Map({width: img.naturalWidth, height: img.naturalHeight}))
      };
      img.onerror = () => {
        this.setState({imageLoadError: true})
      };
    }
  }

  toggleHover1(e) {
    this.setState({hover1: !this.state.hover1})
  }

  toggleHover2(e) {
    this.setState({hover2: !this.state.hover2})
  }

  render() {
    let dist = pointsDistance(this.props.x1, this.props.y1, this.props.x2, this.props.y2);
    let scale = !isNaN(dist) && dist ? (this.props.distance.length / dist) : 0;
    let half_w = this.props.width / 2;

    let ruler = !this.props.element.selected ? null : (
      <g>
        <line key="1" x1={this.props.x1} y1={this.props.y1} x2={this.props.x2} y2={this.props.y2} stroke={rulerColor}
              strokeWidth="3px"/>
        <circle
          onMouseEnter={this.toggleHover1}
          onMouseLeave={this.toggleHover1}
          key="2"
          name="fst-anchor"
          cx={this.props.x1}
          cy={this.props.y1}
          r={this.state.hover1 || this.state.handleMouseMove1 ? hoverCircleRadius : grabCircleRadius}
          style={this.state.hover1 || this.state.handleMouseMove1 ? hoverCircleStyle : grabCircleStyle}/>
        <circle
          onMouseEnter={this.toggleHover2}
          onMouseLeave={this.toggleHover2}
          key="3"
          name="snd-anchor"
          cx={this.props.x2}
          cy={this.props.y2}
          r={this.state.hover2 || this.state.handleMouseMove2 ? hoverCircleRadius : grabCircleRadius}
          style={this.state.hover2 || this.state.handleMouseMove2 ? hoverCircleStyle : grabCircleStyle}/>
      </g>
    );

    return (
      <g
        transform={`scale(${scale}, ${scale}), scale(1,-1) translate(${-this.props.width / 2}, ${-this.props.height / 2})`}>
        {
          this.props.imageUri && !this.state.imageLoadError ?
            <image
              xlinkHref={this.props.imageUri}
              x="0"
              y="0"
              width={this.props.width}
              height={this.props.height}
            /> :
            <g>
              <rect x="0" y="0" width={this.props.width} height={this.props.height} fill="#CCC"></rect>
              <text
                x={half_w}
                y={this.props.height / 2}
                textAnchor="middle"
                alignmentBaseline="central"
                fontFamily="Arial"
                fontSize="35"
                fill="#666"
              >
                <tspan x={half_w} dy="1em">image</tspan>
              </text>
            </g>
        }
        {ruler}
      </g>
    )
  }
}

ImageFul.propTypes = {
  element: PropTypes.object.isRequired,
  x1: PropTypes.number.isRequired,
  y1: PropTypes.number.isRequired,
  x2: PropTypes.number.isRequired,
  y2: PropTypes.number.isRequired,
  distance: PropTypes.object.isRequired,
  width: PropTypes.number.isRequired,
  height: PropTypes.number.isRequired,
  imageUri: PropTypes.string.isRequired,
  layer: PropTypes.object.isRequired,
  scene: PropTypes.object.isRequired,
};

ImageFul.contextTypes = {
  projectActions: PropTypes.object.isRequired,
  catalog: PropTypes.object.isRequired,
  translator: PropTypes.object.isRequired,
};