import { defaultWindow } from '@vueuse/core';
import { isClient } from '@vueuse/shared';
import { ref, watch, nextTick, onUnmounted, computed } from 'vue';
import { u as useStateMachine } from '../shared/useStateMachine.js';

function usePresence(present, node) {
  const stylesRef = ref({});
  const prevAnimationNameRef = ref("none");
  const prevPresentRef = ref(present);
  const initialState = present.value ? "mounted" : "unmounted";
  let timeoutId;
  const ownerWindow = node.value?.ownerDocument.defaultView ?? defaultWindow;
  const { state, dispatch } = useStateMachine(initialState, {
    mounted: {
      UNMOUNT: "unmounted",
      ANIMATION_OUT: "unmountSuspended"
    },
    unmountSuspended: {
      MOUNT: "mounted",
      ANIMATION_END: "unmounted"
    },
    unmounted: {
      MOUNT: "mounted"
    }
  });
  const dispatchCustomEvent = (name) => {
    if (isClient) {
      const customEvent = new CustomEvent(name, { bubbles: false, cancelable: false });
      node.value?.dispatchEvent(customEvent);
    }
  };
  watch(
    present,
    async (currentPresent, prevPresent) => {
      const hasPresentChanged = prevPresent !== currentPresent;
      await nextTick();
      if (hasPresentChanged) {
        const prevAnimationName = prevAnimationNameRef.value;
        const currentAnimationName = getAnimationName(node.value);
        if (currentPresent) {
          dispatch("MOUNT");
          dispatchCustomEvent("enter");
          if (currentAnimationName === "none")
            dispatchCustomEvent("after-enter");
        } else if (currentAnimationName === "none" || currentAnimationName === "undefined" || stylesRef.value?.display === "none") {
          dispatch("UNMOUNT");
          dispatchCustomEvent("leave");
          dispatchCustomEvent("after-leave");
        } else {
          const isAnimating = prevAnimationName !== currentAnimationName;
          if (prevPresent && isAnimating) {
            dispatch("ANIMATION_OUT");
            dispatchCustomEvent("leave");
          } else {
            dispatch("UNMOUNT");
            dispatchCustomEvent("after-leave");
          }
        }
      }
    },
    { immediate: true }
  );
  const handleAnimationEnd = (event) => {
    const currentAnimationName = getAnimationName(node.value);
    const isCurrentAnimation = currentAnimationName.includes(
      event.animationName
    );
    const directionName = state.value === "mounted" ? "enter" : "leave";
    if (event.target === node.value && isCurrentAnimation) {
      dispatchCustomEvent(`after-${directionName}`);
      dispatch("ANIMATION_END");
      if (!prevPresentRef.value) {
        const currentFillMode = node.value.style.animationFillMode;
        node.value.style.animationFillMode = "forwards";
        timeoutId = ownerWindow?.setTimeout(() => {
          if (node.value?.style.animationFillMode === "forwards") {
            node.value.style.animationFillMode = currentFillMode;
          }
        });
      }
    }
    if (event.target === node.value && currentAnimationName === "none")
      dispatch("ANIMATION_END");
  };
  const handleAnimationStart = (event) => {
    if (event.target === node.value) {
      prevAnimationNameRef.value = getAnimationName(node.value);
    }
  };
  const watcher = watch(
    node,
    (newNode, oldNode) => {
      if (newNode) {
        stylesRef.value = getComputedStyle(newNode);
        newNode.addEventListener("animationstart", handleAnimationStart);
        newNode.addEventListener("animationcancel", handleAnimationEnd);
        newNode.addEventListener("animationend", handleAnimationEnd);
      } else {
        dispatch("ANIMATION_END");
        if (timeoutId !== void 0)
          ownerWindow?.clearTimeout(timeoutId);
        oldNode?.removeEventListener("animationstart", handleAnimationStart);
        oldNode?.removeEventListener("animationcancel", handleAnimationEnd);
        oldNode?.removeEventListener("animationend", handleAnimationEnd);
      }
    },
    { immediate: true }
  );
  const stateWatcher = watch(state, () => {
    const currentAnimationName = getAnimationName(node.value);
    prevAnimationNameRef.value = state.value === "mounted" ? currentAnimationName : "none";
  });
  onUnmounted(() => {
    watcher();
    stateWatcher();
  });
  const isPresent = computed(
    () => ["mounted", "unmountSuspended"].includes(state.value)
  );
  return {
    isPresent
  };
}
function getAnimationName(node) {
  return node ? getComputedStyle(node).animationName || "none" : "none";
}

export { usePresence as u };
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