import { onBeforeUnmount, onMounted, watch, shallowRef, computed } from 'vue-demi';
import KeyCode from '../../_util/KeyCode';
import { addGlobalMousedownEvent, getTargetFromEvent } from '../utils/uiUtil';
import raf from '../../_util/raf';
export default function usePickerInput(_ref) {
  let {
    open,
    value,
    isClickOutside,
    triggerOpen,
    forwardKeydown,
    onKeydown,
    blurToCancel,
    onSubmit,
    onCancel,
    onFocus,
    onBlur
  } = _ref;
  const typing = shallowRef(false);
  const focused = shallowRef(false);
  /**
   * We will prevent blur to handle open event when user click outside,
   * since this will repeat trigger `onOpenChange` event.
   */
  const preventBlurRef = shallowRef(false);
  const valueChangedRef = shallowRef(false);
  const preventDefaultRef = shallowRef(false);
  const inputProps = computed(() => ({
    onMousedown: () => {
      typing.value = true;
      triggerOpen(true);
    },
    onKeydown: e => {
      const preventDefault = () => {
        preventDefaultRef.value = true;
      };
      onKeydown(e, preventDefault);
      if (preventDefaultRef.value) return;
      switch (e.which) {
        case KeyCode.ENTER:
          {
            if (!open.value) {
              triggerOpen(true);
            } else if (onSubmit() !== false) {
              typing.value = true;
            }
            e.preventDefault();
            return;
          }
        case KeyCode.TAB:
          {
            if (typing.value && open.value && !e.shiftKey) {
              typing.value = false;
              e.preventDefault();
            } else if (!typing.value && open.value) {
              if (!forwardKeydown(e) && e.shiftKey) {
                typing.value = true;
                e.preventDefault();
              }
            }
            return;
          }
        case KeyCode.ESC:
          {
            typing.value = true;
            onCancel();
            return;
          }
      }
      if (!open.value && ![KeyCode.SHIFT].includes(e.which)) {
        triggerOpen(true);
      } else if (!typing.value) {
        // Let popup panel handle keyboard
        forwardKeydown(e);
      }
    },
    onFocus: e => {
      typing.value = true;
      focused.value = true;
      if (onFocus) {
        onFocus(e);
      }
    },
    onBlur: e => {
      if (preventBlurRef.value || !isClickOutside(document.activeElement)) {
        preventBlurRef.value = false;
        return;
      }
      if (blurToCancel.value) {
        setTimeout(() => {
          let {
            activeElement
          } = document;
          while (activeElement && activeElement.shadowRoot) {
            activeElement = activeElement.shadowRoot.activeElement;
          }
          if (isClickOutside(activeElement)) {
            onCancel();
          }
        }, 0);
      } else if (open.value) {
        triggerOpen(false);
        if (valueChangedRef.value) {
          onSubmit();
        }
      }
      focused.value = false;
      if (onBlur) {
        onBlur(e);
      }
    }
  }));
  // check if value changed
  watch(open, () => {
    valueChangedRef.value = false;
  });
  watch(value, () => {
    valueChangedRef.value = true;
  });
  const globalMousedownEvent = shallowRef();
  // Global click handler
  onMounted(() => {
    globalMousedownEvent.value = addGlobalMousedownEvent(e => {
      const target = getTargetFromEvent(e);
      if (open.value) {
        const clickedOutside = isClickOutside(target);
        if (!clickedOutside) {
          preventBlurRef.value = true;
          // Always set back in case `onBlur` prevented by user
          raf(() => {
            preventBlurRef.value = false;
          });
        } else if (!focused.value || clickedOutside) {
          triggerOpen(false);
        }
      }
    });
  });
  onBeforeUnmount(() => {
    globalMousedownEvent.value && globalMousedownEvent.value();
  });
  return [inputProps, {
    focused,
    typing
  }];
}