import { ref, onMounted, onBeforeUnmount } from 'vue';
import { FOCUSOUT_PREVENTED, FOCUSOUT_PREVENTED_OPTS } from './tokens.mjs';

const focusReason = ref();
const lastUserFocusTimestamp = ref(0);
const lastAutomatedFocusTimestamp = ref(0);
let focusReasonUserCount = 0;
const obtainAllFocusableElements = (element) => {
  const nodes = [];
  const walker = document.createTreeWalker(element, NodeFilter.SHOW_ELEMENT, {
    acceptNode: (node) => {
      const isHiddenInput = node.tagName === "INPUT" && node.type === "hidden";
      if (node.disabled || node.hidden || isHiddenInput)
        return NodeFilter.FILTER_SKIP;
      return node.tabIndex >= 0 || node === document.activeElement ? NodeFilter.FILTER_ACCEPT : NodeFilter.FILTER_SKIP;
    }
  });
  while (walker.nextNode())
    nodes.push(walker.currentNode);
  return nodes;
};
const getVisibleElement = (elements, container) => {
  for (const element of elements) {
    if (!isHidden(element, container))
      return element;
  }
};
const isHidden = (element, container) => {
  if (process.env.NODE_ENV === "test")
    return false;
  if (getComputedStyle(element).visibility === "hidden")
    return true;
  while (element) {
    if (container && element === container)
      return false;
    if (getComputedStyle(element).display === "none")
      return true;
    element = element.parentElement;
  }
  return false;
};
const getEdges = (container) => {
  const focusable = obtainAllFocusableElements(container);
  const first = getVisibleElement(focusable, container);
  const last = getVisibleElement(focusable.reverse(), container);
  return [first, last];
};
const isSelectable = (element) => {
  return element instanceof HTMLInputElement && "select" in element;
};
const tryFocus = (element, shouldSelect) => {
  if (element && element.focus) {
    const prevFocusedElement = document.activeElement;
    element.focus({ preventScroll: true });
    lastAutomatedFocusTimestamp.value = window.performance.now();
    if (element !== prevFocusedElement && isSelectable(element) && shouldSelect) {
      element.select();
    }
  }
};
function removeFromStack(list, item) {
  const copy = [...list];
  const idx = list.indexOf(item);
  if (idx !== -1) {
    copy.splice(idx, 1);
  }
  return copy;
}
const createFocusableStack = () => {
  let stack = [];
  const push = (layer) => {
    const currentLayer = stack[0];
    if (currentLayer && layer !== currentLayer) {
      currentLayer.pause();
    }
    stack = removeFromStack(stack, layer);
    stack.unshift(layer);
  };
  const remove = (layer) => {
    var _a, _b;
    stack = removeFromStack(stack, layer);
    (_b = (_a = stack[0]) == null ? void 0 : _a.resume) == null ? void 0 : _b.call(_a);
  };
  return {
    push,
    remove
  };
};
const focusFirstDescendant = (elements, shouldSelect = false) => {
  const prevFocusedElement = document.activeElement;
  for (const element of elements) {
    tryFocus(element, shouldSelect);
    if (document.activeElement !== prevFocusedElement)
      return;
  }
};
const focusableStack = createFocusableStack();
const isFocusCausedByUserEvent = () => {
  return lastUserFocusTimestamp.value > lastAutomatedFocusTimestamp.value;
};
const notifyFocusReasonPointer = () => {
  focusReason.value = "pointer";
  lastUserFocusTimestamp.value = window.performance.now();
};
const notifyFocusReasonKeydown = () => {
  focusReason.value = "keyboard";
  lastUserFocusTimestamp.value = window.performance.now();
};
const useFocusReason = () => {
  onMounted(() => {
    if (focusReasonUserCount === 0) {
      document.addEventListener("mousedown", notifyFocusReasonPointer);
      document.addEventListener("touchstart", notifyFocusReasonPointer);
      document.addEventListener("keydown", notifyFocusReasonKeydown);
    }
    focusReasonUserCount++;
  });
  onBeforeUnmount(() => {
    focusReasonUserCount--;
    if (focusReasonUserCount <= 0) {
      document.removeEventListener("mousedown", notifyFocusReasonPointer);
      document.removeEventListener("touchstart", notifyFocusReasonPointer);
      document.removeEventListener("keydown", notifyFocusReasonKeydown);
    }
  });
  return {
    focusReason,
    lastUserFocusTimestamp,
    lastAutomatedFocusTimestamp
  };
};
const createFocusOutPreventedEvent = (detail) => {
  return new CustomEvent(FOCUSOUT_PREVENTED, {
    ...FOCUSOUT_PREVENTED_OPTS,
    detail
  });
};

export { createFocusOutPreventedEvent, focusFirstDescendant, focusableStack, getEdges, getVisibleElement, isFocusCausedByUserEvent, isHidden, obtainAllFocusableElements, tryFocus, useFocusReason };
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