import React, { Component } from 'react';
import { DomHandler, ZIndexUtils, classNames, IconUtils } from 'primereact/utils';
import { CSSTransition } from 'primereact/csstransition';
import { Ripple } from 'primereact/ripple';
import PrimeReact from 'primereact/api';

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);
  Object.defineProperty(Constructor, "prototype", {
    writable: false
  });
  return Constructor;
}

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

  return self;
}

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

  return _setPrototypeOf(o, p);
}

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
    }
  });
  Object.defineProperty(subClass, "prototype", {
    writable: false
  });
  if (superClass) _setPrototypeOf(subClass, superClass);
}

function _typeof(obj) {
  "@babel/helpers - typeof";

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

function _possibleConstructorReturn(self, call) {
  if (call && (_typeof(call) === "object" || typeof call === "function")) {
    return call;
  } else if (call !== void 0) {
    throw new TypeError("Derived constructors may only return object or undefined");
  }

  return _assertThisInitialized(self);
}

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

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;
}

function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }
var ScrollTop = /*#__PURE__*/function (_Component) {
  _inherits(ScrollTop, _Component);

  var _super = _createSuper(ScrollTop);

  function ScrollTop(props) {
    var _this;

    _classCallCheck(this, ScrollTop);

    _this = _super.call(this, props);
    _this.state = {
      visible: false
    };
    _this.onClick = _this.onClick.bind(_assertThisInitialized(_this));
    _this.onEnter = _this.onEnter.bind(_assertThisInitialized(_this));
    _this.onEntered = _this.onEntered.bind(_assertThisInitialized(_this));
    _this.onExited = _this.onExited.bind(_assertThisInitialized(_this));
    _this.scrollElementRef = /*#__PURE__*/React.createRef();
    return _this;
  }

  _createClass(ScrollTop, [{
    key: "onClick",
    value: function onClick() {
      var scrollElement = this.props.target === 'window' ? window : this.helper.parentElement;
      scrollElement.scroll({
        top: 0,
        behavior: this.props.behavior
      });
    }
  }, {
    key: "checkVisibility",
    value: function checkVisibility(scrollY) {
      this.setState({
        visible: scrollY > this.props.threshold
      });
    }
  }, {
    key: "bindParentScrollListener",
    value: function bindParentScrollListener() {
      var _this2 = this;

      this.scrollListener = function () {
        _this2.checkVisibility(_this2.helper.parentElement.scrollTop);
      };

      this.helper.parentElement.addEventListener('scroll', this.scrollListener);
    }
  }, {
    key: "bindDocumentScrollListener",
    value: function bindDocumentScrollListener() {
      var _this3 = this;

      this.scrollListener = function () {
        _this3.checkVisibility(DomHandler.getWindowScrollTop());
      };

      window.addEventListener('scroll', this.scrollListener);
    }
  }, {
    key: "unbindParentScrollListener",
    value: function unbindParentScrollListener() {
      if (this.scrollListener) {
        this.helper.parentElement.removeEventListener('scroll', this.scrollListener);
        this.scrollListener = null;
      }
    }
  }, {
    key: "unbindDocumentScrollListener",
    value: function unbindDocumentScrollListener() {
      if (this.scrollListener) {
        window.removeEventListener('scroll', this.scrollListener);
        this.scrollListener = null;
      }
    }
  }, {
    key: "onEnter",
    value: function onEnter() {
      ZIndexUtils.set('overlay', this.scrollElementRef.current, PrimeReact.autoZIndex, PrimeReact.zIndex['overlay']);
    }
  }, {
    key: "onEntered",
    value: function onEntered() {
      this.props.onShow && this.props.onShow();
    }
  }, {
    key: "onExited",
    value: function onExited() {
      ZIndexUtils.clear(this.scrollElementRef.current);
      this.props.onHide && this.props.onHide();
    }
  }, {
    key: "componentDidMount",
    value: function componentDidMount() {
      if (this.props.target === 'window') this.bindDocumentScrollListener();else if (this.props.target === 'parent') this.bindParentScrollListener();
    }
  }, {
    key: "componentWillUnmount",
    value: function componentWillUnmount() {
      if (this.props.target === 'window') this.unbindDocumentScrollListener();else if (this.props.target === 'parent') this.unbindParentScrollListener();
      ZIndexUtils.clear(this.scrollElementRef.current);
    }
  }, {
    key: "render",
    value: function render() {
      var _this4 = this;

      var className = classNames('p-scrolltop p-link p-component', {
        'p-scrolltop-sticky': this.props.target !== 'window'
      }, this.props.className);
      var isTargetParent = this.props.target === 'parent';
      return /*#__PURE__*/React.createElement(React.Fragment, null, /*#__PURE__*/React.createElement(CSSTransition, {
        nodeRef: this.scrollElementRef,
        classNames: "p-scrolltop",
        "in": this.state.visible,
        timeout: {
          enter: 150,
          exit: 150
        },
        options: this.props.transitionOptions,
        unmountOnExit: true,
        onEnter: this.onEnter,
        onEntered: this.onEntered,
        onExited: this.onExited
      }, /*#__PURE__*/React.createElement("button", {
        ref: this.scrollElementRef,
        type: "button",
        className: className,
        style: this.props.style,
        onClick: this.onClick
      }, IconUtils.getJSXIcon(this.props.icon, {
        className: 'p-scrolltop-icon'
      }, {
        props: this.props
      }), /*#__PURE__*/React.createElement(Ripple, null))), isTargetParent && /*#__PURE__*/React.createElement("span", {
        ref: function ref(el) {
          return _this4.helper = el;
        },
        className: "p-scrolltop-helper"
      }));
    }
  }]);

  return ScrollTop;
}(Component);

_defineProperty(ScrollTop, "defaultProps", {
  target: 'window',
  threshold: 400,
  icon: 'pi pi-chevron-up',
  behavior: 'smooth',
  className: null,
  style: null,
  transitionOptions: null,
  onShow: null,
  onHide: null
});

export { ScrollTop };