import {
  DATA_TOP_LAYER_ATTR
} from "./3NI6FTA2.jsx";

// src/primitives/create-focus-scope/create-focus-scope.tsx
import {
  access,
  contains,
  focusWithoutScrolling,
  getActiveElement,
  getAllTabbableIn,
  getDocument,
  isFocusable,
  removeItemFromArray,
  visuallyHiddenStyles
} from "@kobalte/utils";
import { createEffect, createSignal, onCleanup } from "solid-js";
import { isServer } from "solid-js/web";
var AUTOFOCUS_ON_MOUNT_EVENT = "focusScope.autoFocusOnMount";
var AUTOFOCUS_ON_UNMOUNT_EVENT = "focusScope.autoFocusOnUnmount";
var EVENT_OPTIONS = { bubbles: false, cancelable: true };
var focusScopeStack = {
  /** A stack of focus scopes, with the active one at the top */
  stack: [],
  active() {
    return this.stack[0];
  },
  add(scope) {
    if (scope !== this.active()) {
      this.active()?.pause();
    }
    this.stack = removeItemFromArray(this.stack, scope);
    this.stack.unshift(scope);
  },
  remove(scope) {
    this.stack = removeItemFromArray(this.stack, scope);
    this.active()?.resume();
  }
};
function createFocusScope(props, ref) {
  const [isPaused, setIsPaused] = createSignal(false);
  const focusScope = {
    pause() {
      setIsPaused(true);
    },
    resume() {
      setIsPaused(false);
    }
  };
  let lastFocusedElement = null;
  const onMountAutoFocus = (e) => props.onMountAutoFocus?.(e);
  const onUnmountAutoFocus = (e) => props.onUnmountAutoFocus?.(e);
  const ownerDocument = () => getDocument(ref());
  const createSentinel = () => {
    const element = ownerDocument().createElement("span");
    element.setAttribute("data-focus-trap", "");
    element.tabIndex = 0;
    Object.assign(element.style, visuallyHiddenStyles);
    return element;
  };
  const tabbables = () => {
    const container = ref();
    if (!container) {
      return [];
    }
    return getAllTabbableIn(container, true).filter(
      (el) => !el.hasAttribute("data-focus-trap")
    );
  };
  const firstTabbable = () => {
    const items = tabbables();
    return items.length > 0 ? items[0] : null;
  };
  const lastTabbable = () => {
    const items = tabbables();
    return items.length > 0 ? items[items.length - 1] : null;
  };
  const shouldPreventUnmountAutoFocus = () => {
    const container = ref();
    if (!container) {
      return false;
    }
    const activeElement = getActiveElement(container);
    if (!activeElement) {
      return false;
    }
    if (contains(container, activeElement)) {
      return false;
    }
    return isFocusable(activeElement);
  };
  createEffect(() => {
    if (isServer) {
      return;
    }
    const container = ref();
    if (!container) {
      return;
    }
    focusScopeStack.add(focusScope);
    const previouslyFocusedElement = getActiveElement(
      container
    );
    const hasFocusedCandidate = contains(container, previouslyFocusedElement);
    if (!hasFocusedCandidate) {
      const mountEvent = new CustomEvent(
        AUTOFOCUS_ON_MOUNT_EVENT,
        EVENT_OPTIONS
      );
      container.addEventListener(AUTOFOCUS_ON_MOUNT_EVENT, onMountAutoFocus);
      container.dispatchEvent(mountEvent);
      if (!mountEvent.defaultPrevented) {
        setTimeout(() => {
          focusWithoutScrolling(firstTabbable());
          if (getActiveElement(container) === previouslyFocusedElement) {
            focusWithoutScrolling(container);
          }
        }, 0);
      }
    }
    onCleanup(() => {
      container.removeEventListener(AUTOFOCUS_ON_MOUNT_EVENT, onMountAutoFocus);
      setTimeout(() => {
        const unmountEvent = new CustomEvent(
          AUTOFOCUS_ON_UNMOUNT_EVENT,
          EVENT_OPTIONS
        );
        if (shouldPreventUnmountAutoFocus()) {
          unmountEvent.preventDefault();
        }
        container.addEventListener(
          AUTOFOCUS_ON_UNMOUNT_EVENT,
          onUnmountAutoFocus
        );
        container.dispatchEvent(unmountEvent);
        if (!unmountEvent.defaultPrevented) {
          focusWithoutScrolling(
            previouslyFocusedElement ?? ownerDocument().body
          );
        }
        container.removeEventListener(
          AUTOFOCUS_ON_UNMOUNT_EVENT,
          onUnmountAutoFocus
        );
        focusScopeStack.remove(focusScope);
      }, 0);
    });
  });
  createEffect(() => {
    if (isServer) {
      return;
    }
    const container = ref();
    if (!container || !access(props.trapFocus) || isPaused()) {
      return;
    }
    const onFocusIn = (event) => {
      const target = event.target;
      if (target?.closest(`[${DATA_TOP_LAYER_ATTR}]`)) {
        return;
      }
      if (contains(container, target)) {
        lastFocusedElement = target;
      } else {
        focusWithoutScrolling(lastFocusedElement);
      }
    };
    const onFocusOut = (event) => {
      const relatedTarget = event.relatedTarget;
      const target = relatedTarget ?? getActiveElement(container);
      if (target?.closest(`[${DATA_TOP_LAYER_ATTR}]`)) {
        return;
      }
      if (!contains(container, target)) {
        focusWithoutScrolling(lastFocusedElement);
      }
    };
    ownerDocument().addEventListener("focusin", onFocusIn);
    ownerDocument().addEventListener("focusout", onFocusOut);
    onCleanup(() => {
      ownerDocument().removeEventListener("focusin", onFocusIn);
      ownerDocument().removeEventListener("focusout", onFocusOut);
    });
  });
  createEffect(() => {
    if (isServer) {
      return;
    }
    const container = ref();
    if (!container || !access(props.trapFocus) || isPaused()) {
      return;
    }
    const startSentinel = createSentinel();
    container.insertAdjacentElement("afterbegin", startSentinel);
    const endSentinel = createSentinel();
    container.insertAdjacentElement("beforeend", endSentinel);
    function onFocus(event) {
      const first = firstTabbable();
      const last = lastTabbable();
      if (event.relatedTarget === first) {
        focusWithoutScrolling(last);
      } else {
        focusWithoutScrolling(first);
      }
    }
    startSentinel.addEventListener("focusin", onFocus);
    endSentinel.addEventListener("focusin", onFocus);
    const observer = new MutationObserver((mutations) => {
      for (const mutation of mutations) {
        if (mutation.previousSibling === endSentinel) {
          endSentinel.remove();
          container.insertAdjacentElement("beforeend", endSentinel);
        }
        if (mutation.nextSibling === startSentinel) {
          startSentinel.remove();
          container.insertAdjacentElement("afterbegin", startSentinel);
        }
      }
    });
    observer.observe(container, { childList: true, subtree: false });
    onCleanup(() => {
      startSentinel.removeEventListener("focusin", onFocus);
      endSentinel.removeEventListener("focusin", onFocus);
      startSentinel.remove();
      endSentinel.remove();
      observer.disconnect();
    });
  });
}

export {
  createFocusScope
};