import _objectWithoutPropertiesLoose from '../../@babel/runtime/helpers/esm/objectWithoutPropertiesLoose.mjs';
import _inheritsLoose from '../../@babel/runtime/helpers/esm/inheritsLoose.mjs';
import React__default from 'react';
import ReactDOM__default from 'react-dom';
import config from './config.mjs';
import TransitionGroupContext from './TransitionGroupContext.mjs';
import { forceReflow } from './utils/reflow.mjs';

var UNMOUNTED = 'unmounted';
var EXITED = 'exited';
var ENTERING = 'entering';
var ENTERED = 'entered';
var EXITING = 'exiting';
/**
 * The Transition component lets you describe a transition from one component
 * state to another _over time_ with a simple declarative API. Most commonly
 * it's used to animate the mounting and unmounting of a component, but can also
 * be used to describe in-place transition states as well.
 *
 * ---
 *
 * **Note**: `Transition` is a platform-agnostic base component. If you're using
 * transitions in CSS, you'll probably want to use
 * [`CSSTransition`](https://reactcommunity.org/react-transition-group/css-transition)
 * instead. It inherits all the features of `Transition`, but contains
 * additional features necessary to play nice with CSS transitions (hence the
 * name of the component).
 *
 * ---
 *
 * By default the `Transition` component does not alter the behavior of the
 * component it renders, it only tracks "enter" and "exit" states for the
 * components. It's up to you to give meaning and effect to those states. For
 * example we can add styles to a component when it enters or exits:
 *
 * ```jsx
 * import { Transition } from 'react-transition-group';
 *
 * const duration = 300;
 *
 * const defaultStyle = {
 *   transition: `opacity ${duration}ms ease-in-out`,
 *   opacity: 0,
 * }
 *
 * const transitionStyles = {
 *   entering: { opacity: 1 },
 *   entered:  { opacity: 1 },
 *   exiting:  { opacity: 0 },
 *   exited:  { opacity: 0 },
 * };
 *
 * const Fade = ({ in: inProp }) => (
 *   <Transition in={inProp} timeout={duration}>
 *     {state => (
 *       <div style={{
 *         ...defaultStyle,
 *         ...transitionStyles[state]
 *       }}>
 *         I'm a fade Transition!
 *       </div>
 *     )}
 *   </Transition>
 * );
 * ```
 *
 * There are 4 main states a Transition can be in:
 *  - `'entering'`
 *  - `'entered'`
 *  - `'exiting'`
 *  - `'exited'`
 *
 * Transition state is toggled via the `in` prop. When `true` the component
 * begins the "Enter" stage. During this stage, the component will shift from
 * its current transition state, to `'entering'` for the duration of the
 * transition and then to the `'entered'` stage once it's complete. Let's take
 * the following example (we'll use the
 * [useState](https://reactjs.org/docs/hooks-reference.html#usestate) hook):
 *
 * ```jsx
 * function App() {
 *   const [inProp, setInProp] = useState(false);
 *   return (
 *     <div>
 *       <Transition in={inProp} timeout={500}>
 *         {state => (
 *           // ...
 *         )}
 *       </Transition>
 *       <button onClick={() => setInProp(true)}>
 *         Click to Enter
 *       </button>
 *     </div>
 *   );
 * }
 * ```
 *
 * When the button is clicked the component will shift to the `'entering'` state
 * and stay there for 500ms (the value of `timeout`) before it finally switches
 * to `'entered'`.
 *
 * When `in` is `false` the same thing happens except the state moves from
 * `'exiting'` to `'exited'`.
 */

var Transition = /*#__PURE__*/function (_React$Component) {
  _inheritsLoose(Transition, _React$Component);

  function Transition(props, context) {
    var _this;

    _this = _React$Component.call(this, props, context) || this;
    var parentGroup = context; // In the context of a TransitionGroup all enters are really appears

    var appear = parentGroup && !parentGroup.isMounting ? props.enter : props.appear;
    var initialStatus;
    _this.appearStatus = null;

    if (props.in) {
      if (appear) {
        initialStatus = EXITED;
        _this.appearStatus = ENTERING;
      } else {
        initialStatus = ENTERED;
      }
    } else {
      if (props.unmountOnExit || props.mountOnEnter) {
        initialStatus = UNMOUNTED;
      } else {
        initialStatus = EXITED;
      }
    }

    _this.state = {
      status: initialStatus
    };
    _this.nextCallback = null;
    return _this;
  }

  Transition.getDerivedStateFromProps = function getDerivedStateFromProps(_ref, prevState) {
    var nextIn = _ref.in;

    if (nextIn && prevState.status === UNMOUNTED) {
      return {
        status: EXITED
      };
    }

    return null;
  } // getSnapshotBeforeUpdate(prevProps) {
  //   let nextStatus = null
  //   if (prevProps !== this.props) {
  //     const { status } = this.state
  //     if (this.props.in) {
  //       if (status !== ENTERING && status !== ENTERED) {
  //         nextStatus = ENTERING
  //       }
  //     } else {
  //       if (status === ENTERING || status === ENTERED) {
  //         nextStatus = EXITING
  //       }
  //     }
  //   }
  //   return { nextStatus }
  // }
  ;

  var _proto = Transition.prototype;

  _proto.componentDidMount = function componentDidMount() {
    this.updateStatus(true, this.appearStatus);
  };

  _proto.componentDidUpdate = function componentDidUpdate(prevProps) {
    var nextStatus = null;

    if (prevProps !== this.props) {
      var status = this.state.status;

      if (this.props.in) {
        if (status !== ENTERING && status !== ENTERED) {
          nextStatus = ENTERING;
        }
      } else {
        if (status === ENTERING || status === ENTERED) {
          nextStatus = EXITING;
        }
      }
    }

    this.updateStatus(false, nextStatus);
  };

  _proto.componentWillUnmount = function componentWillUnmount() {
    this.cancelNextCallback();
  };

  _proto.getTimeouts = function getTimeouts() {
    var timeout = this.props.timeout;
    var exit, enter, appear;
    exit = enter = appear = timeout;

    if (timeout != null && typeof timeout !== 'number') {
      exit = timeout.exit;
      enter = timeout.enter; // TODO: remove fallback for next major

      appear = timeout.appear !== undefined ? timeout.appear : enter;
    }

    return {
      exit: exit,
      enter: enter,
      appear: appear
    };
  };

  _proto.updateStatus = function updateStatus(mounting, nextStatus) {
    if (mounting === void 0) {
      mounting = false;
    }

    if (nextStatus !== null) {
      // nextStatus will always be ENTERING or EXITING.
      this.cancelNextCallback();

      if (nextStatus === ENTERING) {
        if (this.props.unmountOnExit || this.props.mountOnEnter) {
          var node = this.props.nodeRef ? this.props.nodeRef.current : ReactDOM__default.findDOMNode(this); // https://github.com/reactjs/react-transition-group/pull/749
          // With unmountOnExit or mountOnEnter, the enter animation should happen at the transition between `exited` and `entering`.
          // To make the animation happen,  we have to separate each rendering and avoid being processed as batched.

          if (node) forceReflow(node);
        }

        this.performEnter(mounting);
      } else {
        this.performExit();
      }
    } else if (this.props.unmountOnExit && this.state.status === EXITED) {
      this.setState({
        status: UNMOUNTED
      });
    }
  };

  _proto.performEnter = function performEnter(mounting) {
    var _this2 = this;

    var enter = this.props.enter;
    var appearing = this.context ? this.context.isMounting : mounting;

    var _ref2 = this.props.nodeRef ? [appearing] : [ReactDOM__default.findDOMNode(this), appearing],
        maybeNode = _ref2[0],
        maybeAppearing = _ref2[1];

    var timeouts = this.getTimeouts();
    var enterTimeout = appearing ? timeouts.appear : timeouts.enter; // no enter animation skip right to ENTERED
    // if we are mounting and running this it means appear _must_ be set

    if (!mounting && !enter || config.disabled) {
      this.safeSetState({
        status: ENTERED
      }, function () {
        _this2.props.onEntered(maybeNode);
      });
      return;
    }

    this.props.onEnter(maybeNode, maybeAppearing);
    this.safeSetState({
      status: ENTERING
    }, function () {
      _this2.props.onEntering(maybeNode, maybeAppearing);

      _this2.onTransitionEnd(enterTimeout, function () {
        _this2.safeSetState({
          status: ENTERED
        }, function () {
          _this2.props.onEntered(maybeNode, maybeAppearing);
        });
      });
    });
  };

  _proto.performExit = function performExit() {
    var _this3 = this;

    var exit = this.props.exit;
    var timeouts = this.getTimeouts();
    var maybeNode = this.props.nodeRef ? undefined : ReactDOM__default.findDOMNode(this); // no exit animation skip right to EXITED

    if (!exit || config.disabled) {
      this.safeSetState({
        status: EXITED
      }, function () {
        _this3.props.onExited(maybeNode);
      });
      return;
    }

    this.props.onExit(maybeNode);
    this.safeSetState({
      status: EXITING
    }, function () {
      _this3.props.onExiting(maybeNode);

      _this3.onTransitionEnd(timeouts.exit, function () {
        _this3.safeSetState({
          status: EXITED
        }, function () {
          _this3.props.onExited(maybeNode);
        });
      });
    });
  };

  _proto.cancelNextCallback = function cancelNextCallback() {
    if (this.nextCallback !== null) {
      this.nextCallback.cancel();
      this.nextCallback = null;
    }
  };

  _proto.safeSetState = function safeSetState(nextState, callback) {
    // This shouldn't be necessary, but there are weird race conditions with
    // setState callbacks and unmounting in testing, so always make sure that
    // we can cancel any pending setState callbacks after we unmount.
    callback = this.setNextCallback(callback);
    this.setState(nextState, callback);
  };

  _proto.setNextCallback = function setNextCallback(callback) {
    var _this4 = this;

    var active = true;

    this.nextCallback = function (event) {
      if (active) {
        active = false;
        _this4.nextCallback = null;
        callback(event);
      }
    };

    this.nextCallback.cancel = function () {
      active = false;
    };

    return this.nextCallback;
  };

  _proto.onTransitionEnd = function onTransitionEnd(timeout, handler) {
    this.setNextCallback(handler);
    var node = this.props.nodeRef ? this.props.nodeRef.current : ReactDOM__default.findDOMNode(this);
    var doesNotHaveTimeoutOrListener = timeout == null && !this.props.addEndListener;

    if (!node || doesNotHaveTimeoutOrListener) {
      setTimeout(this.nextCallback, 0);
      return;
    }

    if (this.props.addEndListener) {
      var _ref3 = this.props.nodeRef ? [this.nextCallback] : [node, this.nextCallback],
          maybeNode = _ref3[0],
          maybeNextCallback = _ref3[1];

      this.props.addEndListener(maybeNode, maybeNextCallback);
    }

    if (timeout != null) {
      setTimeout(this.nextCallback, timeout);
    }
  };

  _proto.render = function render() {
    var status = this.state.status;

    if (status === UNMOUNTED) {
      return null;
    }

    var _this$props = this.props,
        children = _this$props.children;
        _this$props.in;
        _this$props.mountOnEnter;
        _this$props.unmountOnExit;
        _this$props.appear;
        _this$props.enter;
        _this$props.exit;
        _this$props.timeout;
        _this$props.addEndListener;
        _this$props.onEnter;
        _this$props.onEntering;
        _this$props.onEntered;
        _this$props.onExit;
        _this$props.onExiting;
        _this$props.onExited;
        _this$props.nodeRef;
        var childProps = _objectWithoutPropertiesLoose(_this$props, ["children", "in", "mountOnEnter", "unmountOnExit", "appear", "enter", "exit", "timeout", "addEndListener", "onEnter", "onEntering", "onEntered", "onExit", "onExiting", "onExited", "nodeRef"]);

    return (
      /*#__PURE__*/
      // allows for nested Transitions
      React__default.createElement(TransitionGroupContext.Provider, {
        value: null
      }, typeof children === 'function' ? children(status, childProps) : React__default.cloneElement(React__default.Children.only(children), childProps))
    );
  };

  return Transition;
}(React__default.Component);

Transition.contextType = TransitionGroupContext;
Transition.propTypes = {}; // Name the function so it is clearer in the documentation

function noop$2() {}

Transition.defaultProps = {
  in: false,
  mountOnEnter: false,
  unmountOnExit: false,
  appear: false,
  enter: true,
  exit: true,
  onEnter: noop$2,
  onEntering: noop$2,
  onEntered: noop$2,
  onExit: noop$2,
  onExiting: noop$2,
  onExited: noop$2
};
Transition.UNMOUNTED = UNMOUNTED;
Transition.EXITED = EXITED;
Transition.ENTERING = ENTERING;
Transition.ENTERED = ENTERED;
Transition.EXITING = EXITING;

export { ENTERED, ENTERING, EXITED, EXITING, UNMOUNTED, Transition as default };
//# sourceMappingURL=Transition.mjs.map
