"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _react = _interopRequireDefault(require("react"));

var _recompose = require("recompose");

var _propTypes = _interopRequireDefault(require("prop-types"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }

function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

var ScrollObserver =
/*#__PURE__*/
function (_React$Component) {
  _inherits(ScrollObserver, _React$Component);

  function ScrollObserver() {
    var _getPrototypeOf2;

    var _this;

    _classCallCheck(this, ScrollObserver);

    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
      args[_key] = arguments[_key];
    }

    _this = _possibleConstructorReturn(this, (_getPrototypeOf2 = _getPrototypeOf(ScrollObserver)).call.apply(_getPrototypeOf2, [this].concat(args)));

    _defineProperty(_assertThisInitialized(_assertThisInitialized(_this)), "isBottomReached", function () {
      var _this$props = _this.props,
          setShouldSendBottomEvent = _this$props.setShouldSendBottomEvent,
          shouldSendBottomEvent = _this$props.shouldSendBottomEvent,
          onBottomReachedThreshold = _this$props.onBottomReachedThreshold;

      if (_this.el) {
        var bottom = _this.el.getBoundingClientRect().bottom;

        var offset = onBottomReachedThreshold;

        if (bottom > window.innerHeight + offset) {
          if (!shouldSendBottomEvent) {
            // turn on event sending
            setShouldSendBottomEvent(true);
          }
        }

        return bottom <= window.innerHeight + offset;
      }
    });

    _defineProperty(_assertThisInitialized(_assertThisInitialized(_this)), "isTopReached", function () {
      var _this$props2 = _this.props,
          setShouldSendTopEvent = _this$props2.setShouldSendTopEvent,
          onTopReachedThreshold = _this$props2.onTopReachedThreshold,
          shouldSendTopEvent = _this$props2.shouldSendTopEvent;

      if (_this.el) {
        var top = _this.el.getBoundingClientRect().top;

        var offset = onTopReachedThreshold;

        if (top + offset < 0) {
          if (!shouldSendTopEvent) {
            // turn on event sending
            setShouldSendTopEvent(true);
          }
        }

        return top + offset >= 0;
      }
    });

    _defineProperty(_assertThisInitialized(_assertThisInitialized(_this)), "observeScrolling", function () {
      var _this$props3 = _this.props,
          onBottomReached = _this$props3.onBottomReached,
          onTopReached = _this$props3.onTopReached,
          setShouldSendBottomEvent = _this$props3.setShouldSendBottomEvent,
          setShouldSendTopEvent = _this$props3.setShouldSendTopEvent,
          shouldSendTopEvent = _this$props3.shouldSendTopEvent,
          shouldSendBottomEvent = _this$props3.shouldSendBottomEvent;

      if (onBottomReached && _this.isBottomReached() && shouldSendBottomEvent) {
        onBottomReached(_this.el);
        setShouldSendBottomEvent(false);
      }

      if (onTopReached && _this.isTopReached() && shouldSendTopEvent) {
        onTopReached(_this.el);
        setShouldSendTopEvent(false);
      }
    });

    return _this;
  }

  _createClass(ScrollObserver, [{
    key: "componentDidMount",
    value: function componentDidMount() {
      // call observeScrolling first time manually when component mount
      // this will be helpful when screen height is too big and total fetch records are occupying less height then screen height
      this.observeScrolling();
      document.addEventListener('scroll', this.observeScrolling);
    }
  }, {
    key: "componentWillUnmount",
    value: function componentWillUnmount() {
      document.removeEventListener('scroll', this.observeScrolling);
    }
  }, {
    key: "render",
    value: function render() {
      var _this2 = this;

      return _react.default.createElement("span", {
        ref: function ref(_ref) {
          return _this2.el = _ref;
        }
      }, this.props.children);
    }
  }]);

  return ScrollObserver;
}(_react.default.Component);

_defineProperty(ScrollObserver, "propTypes", {
  onBottomReached: _propTypes.default.func,
  onBottomReachedThreshold: _propTypes.default.number,
  onTopReached: _propTypes.default.func,
  onTopReachedThreshold: _propTypes.default.number
});

_defineProperty(ScrollObserver, "defaultProps", {
  onBottomReachedThreshold: 0,
  onTopReachedThreshold: 0
});

var _default = (0, _recompose.compose)((0, _recompose.withState)('shouldSendBottomEvent', 'setShouldSendBottomEvent', true), (0, _recompose.withState)('shouldSendTopEvent', 'setShouldSendTopEvent', true))(ScrollObserver);

exports.default = _default;