import _extends from 'babel-runtime/helpers/extends';
import _objectWithoutProperties from 'babel-runtime/helpers/objectWithoutProperties';
import _classCallCheck from 'babel-runtime/helpers/classCallCheck';
import _possibleConstructorReturn from 'babel-runtime/helpers/possibleConstructorReturn';
import _inherits from 'babel-runtime/helpers/inherits';
import classNames from 'classnames';
import css from 'dom-helpers/style';
import React from 'react';
import Transition from 'react-overlays/lib/Transition';

import capitalize from './utils/capitalize';
import createChainedFunction from './utils/createChainedFunction';

var MARGINS = {
  height: ['marginTop', 'marginBottom'],
  width: ['marginLeft', 'marginRight']
};

// reading a dimension prop will cause the browser to recalculate,
// which will let our animations work
function triggerBrowserReflow(node) {
  node.offsetHeight; // eslint-disable-line no-unused-expressions
}

function getDimensionValue(dimension, elem) {
  var value = elem['offset' + capitalize(dimension)];
  var margins = MARGINS[dimension];

  return value + parseInt(css(elem, margins[0]), 10) + parseInt(css(elem, margins[1]), 10);
}

var propTypes = {
  /**
   * Show the component; triggers the expand or collapse animation
   */
  'in': React.PropTypes.bool,

  /**
   * Unmount the component (remove it from the DOM) when it is collapsed
   */
  unmountOnExit: React.PropTypes.bool,

  /**
   * Run the expand animation when the component mounts, if it is initially
   * shown
   */
  transitionAppear: React.PropTypes.bool,

  /**
   * Duration of the collapse animation in milliseconds, to ensure that
   * finishing callbacks are fired even if the original browser transition end
   * events are canceled
   */
  timeout: React.PropTypes.number,

  /**
   * Callback fired before the component expands
   */
  onEnter: React.PropTypes.func,
  /**
   * Callback fired after the component starts to expand
   */
  onEntering: React.PropTypes.func,
  /**
   * Callback fired after the component has expanded
   */
  onEntered: React.PropTypes.func,
  /**
   * Callback fired before the component collapses
   */
  onExit: React.PropTypes.func,
  /**
   * Callback fired after the component starts to collapse
   */
  onExiting: React.PropTypes.func,
  /**
   * Callback fired after the component has collapsed
   */
  onExited: React.PropTypes.func,

  /**
   * The dimension used when collapsing, or a function that returns the
   * dimension
   *
   * _Note: Bootstrap only partially supports 'width'!
   * You will need to supply your own CSS animation for the `.width` CSS class._
   */
  dimension: React.PropTypes.oneOfType([React.PropTypes.oneOf(['height', 'width']), React.PropTypes.func]),

  /**
   * Function that returns the height or width of the animating DOM node
   *
   * Allows for providing some custom logic for how much the Collapse component
   * should animate in its specified dimension. Called with the current
   * dimension prop value and the DOM node.
   */
  getDimensionValue: React.PropTypes.func,

  /**
   * ARIA role of collapsible element
   */
  role: React.PropTypes.string
};

var defaultProps = {
  'in': false,
  timeout: 300,
  unmountOnExit: false,
  transitionAppear: false,

  dimension: 'height',
  getDimensionValue: getDimensionValue
};

var Collapse = function (_React$Component) {
  _inherits(Collapse, _React$Component);

  function Collapse(props, context) {
    _classCallCheck(this, Collapse);

    var _this = _possibleConstructorReturn(this, _React$Component.call(this, props, context));

    _this.handleEnter = _this.handleEnter.bind(_this);
    _this.handleEntering = _this.handleEntering.bind(_this);
    _this.handleEntered = _this.handleEntered.bind(_this);
    _this.handleExit = _this.handleExit.bind(_this);
    _this.handleExiting = _this.handleExiting.bind(_this);
    return _this;
  }

  /* -- Expanding -- */


  Collapse.prototype.handleEnter = function handleEnter(elem) {
    var dimension = this._dimension();
    elem.style[dimension] = '0';
  };

  Collapse.prototype.handleEntering = function handleEntering(elem) {
    var dimension = this._dimension();
    elem.style[dimension] = this._getScrollDimensionValue(elem, dimension);
  };

  Collapse.prototype.handleEntered = function handleEntered(elem) {
    var dimension = this._dimension();
    elem.style[dimension] = null;
  };

  /* -- Collapsing -- */


  Collapse.prototype.handleExit = function handleExit(elem) {
    var dimension = this._dimension();
    elem.style[dimension] = this.props.getDimensionValue(dimension, elem) + 'px';
    triggerBrowserReflow(elem);
  };

  Collapse.prototype.handleExiting = function handleExiting(elem) {
    var dimension = this._dimension();
    elem.style[dimension] = '0';
  };

  Collapse.prototype._dimension = function _dimension() {
    return typeof this.props.dimension === 'function' ? this.props.dimension() : this.props.dimension;
  };

  // for testing


  Collapse.prototype._getScrollDimensionValue = function _getScrollDimensionValue(elem, dimension) {
    return elem['scroll' + capitalize(dimension)] + 'px';
  };

  Collapse.prototype.render = function render() {
    var _props = this.props,
        onEnter = _props.onEnter,
        onEntering = _props.onEntering,
        onEntered = _props.onEntered,
        onExit = _props.onExit,
        onExiting = _props.onExiting,
        className = _props.className,
        props = _objectWithoutProperties(_props, ['onEnter', 'onEntering', 'onEntered', 'onExit', 'onExiting', 'className']);

    delete props.dimension;
    delete props.getDimensionValue;

    var handleEnter = createChainedFunction(this.handleEnter, onEnter);
    var handleEntering = createChainedFunction(this.handleEntering, onEntering);
    var handleEntered = createChainedFunction(this.handleEntered, onEntered);
    var handleExit = createChainedFunction(this.handleExit, onExit);
    var handleExiting = createChainedFunction(this.handleExiting, onExiting);

    var classes = {
      width: this._dimension() === 'width'
    };

    return React.createElement(Transition, _extends({}, props, {
      'aria-expanded': props.role ? props['in'] : null,
      className: classNames(className, classes),
      exitedClassName: 'collapse',
      exitingClassName: 'collapsing',
      enteredClassName: 'collapse in',
      enteringClassName: 'collapsing',
      onEnter: handleEnter,
      onEntering: handleEntering,
      onEntered: handleEntered,
      onExit: handleExit,
      onExiting: handleExiting
    }));
  };

  return Collapse;
}(React.Component);

Collapse.propTypes = propTypes;
Collapse.defaultProps = defaultProps;

export default Collapse;