"use strict";

var _interopRequire = function (obj) { return obj && obj.__esModule ? obj["default"] : obj; };

var React = _interopRequire(require("react"));

var TransitionEvents = _interopRequire(require("react/lib/ReactTransitionEvents"));

var CollapsableMixin = {

  propTypes: {
    defaultExpanded: React.PropTypes.bool,
    expanded: React.PropTypes.bool
  },

  getInitialState: function getInitialState() {
    var defaultExpanded = this.props.defaultExpanded != null ? this.props.defaultExpanded : this.props.expanded != null ? this.props.expanded : false;

    return {
      expanded: defaultExpanded,
      collapsing: false
    };
  },

  componentWillUpdate: function componentWillUpdate(nextProps, nextState) {
    var willExpanded = nextProps.expanded != null ? nextProps.expanded : nextState.expanded;
    if (willExpanded === this.isExpanded()) {
      return;
    }

    // if the expanded state is being toggled, ensure node has a dimension value
    // this is needed for the animation to work and needs to be set before
    // the collapsing class is applied (after collapsing is applied the in class
    // is removed and the node's dimension will be wrong)

    var node = this.getCollapsableDOMNode();
    var dimension = this.dimension();
    var value = "0";

    if (!willExpanded) {
      value = this.getCollapsableDimensionValue();
    }

    node.style[dimension] = value + "px";

    this._afterWillUpdate();
  },

  componentDidUpdate: function componentDidUpdate(prevProps, prevState) {
    // check if expanded is being toggled; if so, set collapsing
    this._checkToggleCollapsing(prevProps, prevState);

    // check if collapsing was turned on; if so, start animation
    this._checkStartAnimation();
  },

  // helps enable test stubs
  _afterWillUpdate: function _afterWillUpdate() {},

  _checkStartAnimation: function _checkStartAnimation() {
    if (!this.state.collapsing) {
      return;
    }

    var node = this.getCollapsableDOMNode();
    var dimension = this.dimension();
    var value = this.getCollapsableDimensionValue();

    // setting the dimension here starts the transition animation
    var result = undefined;
    if (this.isExpanded()) {
      result = value + "px";
    } else {
      result = "0px";
    }
    node.style[dimension] = result;
  },

  _checkToggleCollapsing: function _checkToggleCollapsing(prevProps, prevState) {
    var wasExpanded = prevProps.expanded != null ? prevProps.expanded : prevState.expanded;
    var isExpanded = this.isExpanded();
    if (wasExpanded !== isExpanded) {
      if (wasExpanded) {
        this._handleCollapse();
      } else {
        this._handleExpand();
      }
    }
  },

  _handleExpand: function _handleExpand() {
    var _this = this;

    var node = this.getCollapsableDOMNode();
    var dimension = this.dimension();

    var complete = function () {
      _this._removeEndEventListener(node, complete);
      // remove dimension value - this ensures the collapsable item can grow
      // in dimension after initial display (such as an image loading)
      node.style[dimension] = "";
      _this.setState({
        collapsing: false
      });
    };

    this._addEndEventListener(node, complete);

    this.setState({
      collapsing: true
    });
  },

  _handleCollapse: function _handleCollapse() {
    var _this = this;

    var node = this.getCollapsableDOMNode();

    var complete = function () {
      _this._removeEndEventListener(node, complete);
      _this.setState({
        collapsing: false
      });
    };

    this._addEndEventListener(node, complete);

    this.setState({
      collapsing: true
    });
  },

  // helps enable test stubs
  _addEndEventListener: function _addEndEventListener(node, complete) {
    TransitionEvents.addEndEventListener(node, complete);
  },

  // helps enable test stubs
  _removeEndEventListener: function _removeEndEventListener(node, complete) {
    TransitionEvents.removeEndEventListener(node, complete);
  },

  dimension: function dimension() {
    return typeof this.getCollapsableDimension === "function" ? this.getCollapsableDimension() : "height";
  },

  isExpanded: function isExpanded() {
    return this.props.expanded != null ? this.props.expanded : this.state.expanded;
  },

  getCollapsableClassSet: function getCollapsableClassSet(className) {
    var classes = {};

    if (typeof className === "string") {
      className.split(" ").forEach(function (subClasses) {
        if (subClasses) {
          classes[subClasses] = true;
        }
      });
    }

    classes.collapsing = this.state.collapsing;
    classes.collapse = !this.state.collapsing;
    classes["in"] = this.isExpanded() && !this.state.collapsing;

    return classes;
  }
};

module.exports = CollapsableMixin;