import PropTypes from '../../_util/vue-types';
import { initDefaultProps } from '../../_util/props-util';
import enhancer from './enhancer';
import { propTypes, defaultProps } from './types';

const circlePropTypes = {
  ...propTypes,
  gapPosition: PropTypes.oneOf(['top', 'bottom', 'left', 'right']),
  gapDegree: PropTypes.oneOfType([PropTypes.number, PropTypes.string, PropTypes.bool]),
};

const circleDefaultProps = {
  ...defaultProps,
  gapPosition: 'top',
};

let gradientSeed = 0;

function stripPercentToNumber(percent) {
  return +percent.replace('%', '');
}

function toArray(symArray) {
  return Array.isArray(symArray) ? symArray : [symArray];
}

function getPathStyles(offset, percent, strokeColor, strokeWidth, gapDegree = 0, gapPosition) {
  const radius = 50 - strokeWidth / 2;
  let beginPositionX = 0;
  let beginPositionY = -radius;
  let endPositionX = 0;
  let endPositionY = -2 * radius;
  switch (gapPosition) {
    case 'left':
      beginPositionX = -radius;
      beginPositionY = 0;
      endPositionX = 2 * radius;
      endPositionY = 0;
      break;
    case 'right':
      beginPositionX = radius;
      beginPositionY = 0;
      endPositionX = -2 * radius;
      endPositionY = 0;
      break;
    case 'bottom':
      beginPositionY = radius;
      endPositionY = 2 * radius;
      break;
    default:
  }
  const pathString = `M 50,50 m ${beginPositionX},${beginPositionY}
   a ${radius},${radius} 0 1 1 ${endPositionX},${-endPositionY}
   a ${radius},${radius} 0 1 1 ${-endPositionX},${endPositionY}`;
  const len = Math.PI * 2 * radius;

  const pathStyle = {
    stroke: strokeColor,
    strokeDasharray: `${(percent / 100) * (len - gapDegree)}px ${len}px`,
    strokeDashoffset: `-${gapDegree / 2 + (offset / 100) * (len - gapDegree)}px`,
    transition:
      'stroke-dashoffset .3s ease 0s, stroke-dasharray .3s ease 0s, stroke .3s, stroke-width .06s ease .3s', // eslint-disable-line
  };

  return {
    pathString,
    pathStyle,
  };
}

const Circle = {
  name: 'Circle',
  props: initDefaultProps(circlePropTypes, circleDefaultProps),
  created() {
    this.paths = {};
    this.gradientId = gradientSeed;
    gradientSeed += 1;
  },
  methods: {
    getStokeList() {
      const {
        prefixCls,
        percent,
        strokeColor,
        strokeWidth,
        strokeLinecap,
        gapDegree,
        gapPosition,
      } = this.$props;
      const percentList = toArray(percent);
      const strokeColorList = toArray(strokeColor);

      let stackPtg = 0;
      return percentList.map((ptg, index) => {
        const color = strokeColorList[index] || strokeColorList[strokeColorList.length - 1];
        const stroke =
          Object.prototype.toString.call(color) === '[object Object]'
            ? `url(#${prefixCls}-gradient-${this.gradientId})`
            : '';
        const { pathString, pathStyle } = getPathStyles(
          stackPtg,
          ptg,
          color,
          strokeWidth,
          gapDegree,
          gapPosition,
        );

        stackPtg += ptg;

        const pathProps = {
          key: index,
          d: pathString,
          stroke,
          'stroke-linecap': strokeLinecap,
          'stroke-width': ptg === 0 ? 0 : strokeWidth,
          'fill-opacity': '0',
          class: `${prefixCls}-circle-path`,
          style: pathStyle,
        };
        return <path ref={c => (this.paths[index] = c)} {...pathProps} />;
      });
    },
  },

  render() {
    const {
      prefixCls,
      strokeWidth,
      trailWidth,
      gapDegree,
      gapPosition,
      trailColor,
      strokeLinecap,
      strokeColor,
      ...restProps
    } = this.$props;
    const { pathString, pathStyle } = getPathStyles(
      0,
      100,
      trailColor,
      strokeWidth,
      gapDegree,
      gapPosition,
    );
    delete restProps.percent;
    const strokeColorList = toArray(strokeColor);
    const gradient = strokeColorList.find(
      color => Object.prototype.toString.call(color) === '[object Object]',
    );
    const pathFirst = {
      d: pathString,
      stroke: trailColor,
      'stroke-linecap': strokeLinecap,
      'stroke-width': trailWidth || strokeWidth,
      'fill-opacity': '0',
      class: `${prefixCls}-circle-trail`,
      style: pathStyle,
    };

    return (
      <svg class={`${prefixCls}-circle`} viewBox="0 0 100 100" {...restProps}>
        {gradient && (
          <defs>
            <linearGradient
              id={`${prefixCls}-gradient-${this.gradientId}`}
              x1="100%"
              y1="0%"
              x2="0%"
              y2="0%"
            >
              {Object.keys(gradient)
                .sort((a, b) => stripPercentToNumber(a) - stripPercentToNumber(b))
                .map((key, index) => (
                  <stop key={index} offset={key} stop-color={gradient[key]} />
                ))}
            </linearGradient>
          </defs>
        )}
        <path {...pathFirst} />
        {this.getStokeList().reverse()}
      </svg>
    );
  },
};

export default enhancer(Circle);
