import { CHANGE_EVENT } from "../../../constants/event.mjs";
import { throwError } from "../../../utils/error.mjs";
import { addUnit } from "../../../utils/dom/style.mjs";
import { getScrollContainer } from "../../../utils/dom/scroll.mjs";
import { ElTeleport } from "../../teleport/index.mjs";
import { affixEmits, affixProps } from "./affix.mjs";
import { useNamespace } from "../../../hooks/use-namespace/index.mjs";
import { useWindowSize, useElementBounding, useEventListener } from "../../../../node_modules/@vueuse/core/index.mjs";
import { defineComponent, shallowRef, ref, computed, watch, onMounted, onActivated, nextTick, onDeactivated, watchEffect, createElementBlock, openBlock, normalizeStyle, normalizeClass, unref, createVNode, withCtx, createElementVNode, renderSlot } from "vue";
const COMPONENT_NAME = "ElAffix";
var affix_vue_vue_type_script_setup_true_lang_default = /* @__PURE__ */ defineComponent({
  name: COMPONENT_NAME,
  __name: "affix",
  props: affixProps,
  emits: affixEmits,
  setup(__props, { expose: __expose, emit: __emit }) {
    const props = __props;
    const emit = __emit;
    const ns = useNamespace("affix");
    const target = shallowRef();
    const root = shallowRef();
    const scrollContainer = shallowRef();
    const { height: windowHeight } = useWindowSize();
    const { height: rootHeight, width: rootWidth, top: rootTop, bottom: rootBottom, left: rootLeft, update: updateRoot } = useElementBounding(root, { windowScroll: false });
    const targetRect = useElementBounding(target);
    const fixed = ref(false);
    const scrollTop = ref(0);
    const transform = ref(0);
    const teleportDisabled = computed(() => {
      return !props.teleported || !fixed.value;
    });
    const rootStyle = computed(() => {
      return {
        display: "flow-root",
        height: fixed.value ? `${rootHeight.value}px` : "",
        width: fixed.value ? `${rootWidth.value}px` : ""
      };
    });
    const affixStyle = computed(() => {
      if (!fixed.value) return {};
      const offset = addUnit(props.offset);
      return {
        height: `${rootHeight.value}px`,
        width: `${rootWidth.value}px`,
        top: props.position === "top" ? offset : "",
        bottom: props.position === "bottom" ? offset : "",
        left: props.teleported ? `${rootLeft.value}px` : "",
        transform: transform.value ? `translateY(${transform.value}px)` : "",
        zIndex: props.zIndex
      };
    });
    const update = () => {
      if (!scrollContainer.value) return;
      scrollTop.value = scrollContainer.value instanceof Window ? document.documentElement.scrollTop : scrollContainer.value.scrollTop || 0;
      const { position, target: target2, offset } = props;
      const rootHeightOffset = offset + rootHeight.value;
      if (position === "top") if (target2) {
        const difference = targetRect.bottom.value - rootHeightOffset;
        fixed.value = offset > rootTop.value && targetRect.bottom.value > 0;
        transform.value = difference < 0 ? difference : 0;
      } else fixed.value = offset > rootTop.value;
      else if (target2) {
        const difference = windowHeight.value - targetRect.top.value - rootHeightOffset;
        fixed.value = windowHeight.value - offset < rootBottom.value && windowHeight.value > targetRect.top.value;
        transform.value = difference < 0 ? -difference : 0;
      } else fixed.value = windowHeight.value - offset < rootBottom.value;
    };
    const updateRootRect = async () => {
      if (!fixed.value) {
        updateRoot();
        return;
      }
      fixed.value = false;
      await nextTick();
      updateRoot();
      fixed.value = true;
    };
    const handleScroll = async () => {
      updateRoot();
      await nextTick();
      emit("scroll", {
        scrollTop: scrollTop.value,
        fixed: fixed.value
      });
    };
    watch(fixed, (val) => emit(CHANGE_EVENT, val));
    onMounted(() => {
      if (props.target) {
        target.value = document.querySelector(props.target) ?? void 0;
        if (!target.value) throwError(COMPONENT_NAME, `Target does not exist: ${props.target}`);
      } else target.value = document.documentElement;
      scrollContainer.value = getScrollContainer(root.value, true);
      updateRoot();
    });
    onActivated(() => {
      nextTick(updateRootRect);
    });
    onDeactivated(() => {
      fixed.value = false;
    });
    useEventListener(scrollContainer, "scroll", handleScroll);
    watchEffect(update);
    __expose({
      update,
      updateRoot: updateRootRect
    });
    return (_ctx, _cache) => {
      return openBlock(), createElementBlock("div", {
        ref_key: "root",
        ref: root,
        class: normalizeClass(unref(ns).b()),
        style: normalizeStyle(rootStyle.value)
      }, [createVNode(unref(ElTeleport), {
        disabled: teleportDisabled.value,
        to: __props.appendTo
      }, {
        default: withCtx(() => [createElementVNode("div", {
          class: normalizeClass({ [unref(ns).m("fixed")]: fixed.value }),
          style: normalizeStyle(affixStyle.value)
        }, [renderSlot(_ctx.$slots, "default")], 6)]),
        _: 3
      }, 8, ["disabled", "to"])], 6);
    };
  }
});
export {
  affix_vue_vue_type_script_setup_true_lang_default as default
};
