import { Children as A, cloneElement as sn } from '../../../preact/compat/dist/compat.module.mjs';
import { useComposedRefs } from '../../react-compose-refs/dist/index.mjs';
import { useLayoutEffect as useLayoutEffect2 } from '../../react-use-layout-effect/dist/index.mjs';
import { useState as h, useRef as _, useEffect as p, useCallback as T, useReducer as s } from '../../../preact/hooks/dist/hooks.module.mjs';

function useStateMachine(initialState, machine) {
  return s((state, event) => {
    const nextState = machine[state][event];
    return nextState ?? state;
  }, initialState);
}

// src/presence.tsx
var Presence = (props) => {
  const { present, children } = props;
  const presence = usePresence(present);
  const child = typeof children === "function" ? children({ present: presence.isPresent }) : A.only(children);
  const ref = useComposedRefs(presence.ref, getElementRef(child));
  const forceMount = typeof children === "function";
  return forceMount || presence.isPresent ? sn(child, { ref }) : null;
};
Presence.displayName = "Presence";
function usePresence(present) {
  const [node, setNode] = h();
  const stylesRef = _(null);
  const prevPresentRef = _(present);
  const prevAnimationNameRef = _("none");
  const initialState = present ? "mounted" : "unmounted";
  const [state, send] = useStateMachine(initialState, {
    mounted: {
      UNMOUNT: "unmounted",
      ANIMATION_OUT: "unmountSuspended"
    },
    unmountSuspended: {
      MOUNT: "mounted",
      ANIMATION_END: "unmounted"
    },
    unmounted: {
      MOUNT: "mounted"
    }
  });
  p(() => {
    const currentAnimationName = getAnimationName(stylesRef.current);
    prevAnimationNameRef.current = state === "mounted" ? currentAnimationName : "none";
  }, [state]);
  useLayoutEffect2(() => {
    const styles = stylesRef.current;
    const wasPresent = prevPresentRef.current;
    const hasPresentChanged = wasPresent !== present;
    if (hasPresentChanged) {
      const prevAnimationName = prevAnimationNameRef.current;
      const currentAnimationName = getAnimationName(styles);
      if (present) {
        send("MOUNT");
      } else if (currentAnimationName === "none" || styles?.display === "none") {
        send("UNMOUNT");
      } else {
        const isAnimating = prevAnimationName !== currentAnimationName;
        if (wasPresent && isAnimating) {
          send("ANIMATION_OUT");
        } else {
          send("UNMOUNT");
        }
      }
      prevPresentRef.current = present;
    }
  }, [present, send]);
  useLayoutEffect2(() => {
    if (node) {
      let timeoutId;
      const ownerWindow = node.ownerDocument.defaultView ?? window;
      const handleAnimationEnd = (event) => {
        const currentAnimationName = getAnimationName(stylesRef.current);
        const isCurrentAnimation = currentAnimationName.includes(CSS.escape(event.animationName));
        if (event.target === node && isCurrentAnimation) {
          send("ANIMATION_END");
          if (!prevPresentRef.current) {
            const currentFillMode = node.style.animationFillMode;
            node.style.animationFillMode = "forwards";
            timeoutId = ownerWindow.setTimeout(() => {
              if (node.style.animationFillMode === "forwards") {
                node.style.animationFillMode = currentFillMode;
              }
            });
          }
        }
      };
      const handleAnimationStart = (event) => {
        if (event.target === node) {
          prevAnimationNameRef.current = getAnimationName(stylesRef.current);
        }
      };
      node.addEventListener("animationstart", handleAnimationStart);
      node.addEventListener("animationcancel", handleAnimationEnd);
      node.addEventListener("animationend", handleAnimationEnd);
      return () => {
        ownerWindow.clearTimeout(timeoutId);
        node.removeEventListener("animationstart", handleAnimationStart);
        node.removeEventListener("animationcancel", handleAnimationEnd);
        node.removeEventListener("animationend", handleAnimationEnd);
      };
    } else {
      send("ANIMATION_END");
    }
  }, [node, send]);
  return {
    isPresent: ["mounted", "unmountSuspended"].includes(state),
    ref: T((node2) => {
      stylesRef.current = node2 ? getComputedStyle(node2) : null;
      setNode(node2);
    }, [])
  };
}
function getAnimationName(styles) {
  return styles?.animationName || "none";
}
function getElementRef(element) {
  let getter = Object.getOwnPropertyDescriptor(element.props, "ref")?.get;
  let mayWarn = getter && "isReactWarning" in getter && getter.isReactWarning;
  if (mayWarn) {
    return element.ref;
  }
  getter = Object.getOwnPropertyDescriptor(element, "ref")?.get;
  mayWarn = getter && "isReactWarning" in getter && getter.isReactWarning;
  if (mayWarn) {
    return element.props.ref;
  }
  return element.props.ref || element.ref;
}

export { Presence };
//# sourceMappingURL=index.mjs.map
