"use strict";

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

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

var domUtils = _interopRequire(require("./utils/domUtils"));

var EventListener = _interopRequire(require("./utils/EventListener"));

var AffixMixin = {
  propTypes: {
    offset: React.PropTypes.number,
    offsetTop: React.PropTypes.number,
    offsetBottom: React.PropTypes.number
  },

  getInitialState: function getInitialState() {
    return {
      affixClass: "affix-top"
    };
  },

  getPinnedOffset: function getPinnedOffset(DOMNode) {
    if (this.pinnedOffset) {
      return this.pinnedOffset;
    }

    DOMNode.className = DOMNode.className.replace(/affix-top|affix-bottom|affix/, "");
    DOMNode.className += DOMNode.className.length ? " affix" : "affix";

    this.pinnedOffset = domUtils.getOffset(DOMNode).top - window.pageYOffset;

    return this.pinnedOffset;
  },

  checkPosition: function checkPosition() {
    var DOMNode = undefined,
        scrollHeight = undefined,
        scrollTop = undefined,
        position = undefined,
        offsetTop = undefined,
        offsetBottom = undefined,
        affix = undefined,
        affixType = undefined,
        affixPositionTop = undefined;

    // TODO: or not visible
    if (!this.isMounted()) {
      return;
    }

    DOMNode = React.findDOMNode(this);
    scrollHeight = document.documentElement.offsetHeight;
    scrollTop = window.pageYOffset;
    position = domUtils.getOffset(DOMNode);

    if (this.affixed === "top") {
      position.top += scrollTop;
    }

    offsetTop = this.props.offsetTop != null ? this.props.offsetTop : this.props.offset;
    offsetBottom = this.props.offsetBottom != null ? this.props.offsetBottom : this.props.offset;

    if (offsetTop == null && offsetBottom == null) {
      return;
    }
    if (offsetTop == null) {
      offsetTop = 0;
    }
    if (offsetBottom == null) {
      offsetBottom = 0;
    }

    if (this.unpin != null && scrollTop + this.unpin <= position.top) {
      affix = false;
    } else if (offsetBottom != null && position.top + DOMNode.offsetHeight >= scrollHeight - offsetBottom) {
      affix = "bottom";
    } else if (offsetTop != null && scrollTop <= offsetTop) {
      affix = "top";
    } else {
      affix = false;
    }

    if (this.affixed === affix) {
      return;
    }

    if (this.unpin != null) {
      DOMNode.style.top = "";
    }

    affixType = "affix" + (affix ? "-" + affix : "");

    this.affixed = affix;
    this.unpin = affix === "bottom" ? this.getPinnedOffset(DOMNode) : null;

    if (affix === "bottom") {
      DOMNode.className = DOMNode.className.replace(/affix-top|affix-bottom|affix/, "affix-bottom");
      affixPositionTop = scrollHeight - offsetBottom - DOMNode.offsetHeight - domUtils.getOffset(DOMNode).top;
    }

    this.setState({
      affixClass: affixType,
      affixPositionTop: affixPositionTop
    });
  },

  checkPositionWithEventLoop: function checkPositionWithEventLoop() {
    setTimeout(this.checkPosition, 0);
  },

  componentDidMount: function componentDidMount() {
    this._onWindowScrollListener = EventListener.listen(window, "scroll", this.checkPosition);
    this._onDocumentClickListener = EventListener.listen(domUtils.ownerDocument(this), "click", this.checkPositionWithEventLoop);
  },

  componentWillUnmount: function componentWillUnmount() {
    if (this._onWindowScrollListener) {
      this._onWindowScrollListener.remove();
    }

    if (this._onDocumentClickListener) {
      this._onDocumentClickListener.remove();
    }
  },

  componentDidUpdate: function componentDidUpdate(prevProps, prevState) {
    if (prevState.affixClass === this.state.affixClass) {
      this.checkPositionWithEventLoop();
    }
  }
};

module.exports = AffixMixin;