import React, { Component, PropTypes } from 'react';
import classnames from 'classnames';
import { themr } from 'react-css-themr';
import { PROGRESS_BAR } from '../identifiers';
import prefixer from '../utils/prefixer';

class ProgressBar extends Component {
  static propTypes = {
    buffer: PropTypes.number,
    className: PropTypes.string,
    disabled: PropTypes.bool,
    max: PropTypes.number,
    min: PropTypes.number,
    mode: PropTypes.oneOf(['determinate', 'indeterminate']),
    multicolor: PropTypes.bool,
    theme: PropTypes.shape({
      buffer: PropTypes.string,
      circle: PropTypes.string,
      circular: PropTypes.string,
      indeterminate: PropTypes.string,
      linear: PropTypes.string,
      multicolor: PropTypes.string,
      path: PropTypes.string,
      value: PropTypes.string,
    }),
    type: PropTypes.oneOf(['linear', 'circular']),
    value: PropTypes.number,
  };

  static defaultProps = {
    buffer: 0,
    className: '',
    max: 100,
    min: 0,
    mode: 'indeterminate',
    multicolor: false,
    type: 'linear',
    value: 0,
  };

  calculateRatio(value) {
    if (value < this.props.min) return 0;
    if (value > this.props.max) return 1;
    return (value - this.props.min) / (this.props.max - this.props.min);
  }

  circularStyle() {
    return this.props.mode !== 'indeterminate'
      ? { strokeDasharray: `${2 * Math.PI * 25 * this.calculateRatio(this.props.value)}, 400` }
      : undefined;
  }

  linearStyle() {
    if (this.props.mode !== 'indeterminate') {
      return {
        buffer: prefixer({ transform: `scaleX(${this.calculateRatio(this.props.buffer)})` }),
        value: prefixer({ transform: `scaleX(${this.calculateRatio(this.props.value)})` }),
      };
    }
    return {};
  }

  renderCircular() {
    return (
      <svg className={this.props.theme.circle} viewBox="0 0 60 60">
        <circle className={this.props.theme.path} style={this.circularStyle()} cx="30" cy="30" r="25" />
      </svg>
    );
  }

  renderLinear() {
    const { buffer, value } = this.linearStyle();
    return (
      <div>
        <span data-ref="buffer" className={this.props.theme.buffer} style={buffer} />
        <span data-ref="value" className={this.props.theme.value} style={value} />
      </div>
    );
  }

  render() {
    const { className, disabled, max, min, mode, multicolor, type, theme, value } = this.props;
    const _className = classnames(theme[type], {
      [theme[mode]]: mode,
      [theme.multicolor]: multicolor,
    }, className);

    return (
      <div
        disabled={disabled}
        data-react-toolbox="progress-bar"
        aria-valuenow={value}
        aria-valuemin={min}
        aria-valuemax={max}
        className={_className}
      >
        {type === 'circular' ? this.renderCircular() : this.renderLinear()}
      </div>
    );
  }
}

export default themr(PROGRESS_BAR)(ProgressBar);
export { ProgressBar };