import { useI18n } from '@affine/i18n';
import { ArrowLeftSmallIcon } from '@blocksuite/icons/rc';
import { Slot } from '@radix-ui/react-slot';
import clsx from 'clsx';
import { useCallback, useContext, useEffect, useState } from 'react';

import { observeResize } from '../../../utils';
import { Button } from '../../button';
import { Modal } from '../../modal';
import { Scrollable } from '../../scrollbar';
import type { MenuProps } from '../menu.types';
import {
  MobileMenuContext,
  type SubMenuContent,
  useMobileSubMenuHelper,
} from './context';
import * as styles from './styles.css';
import { MobileMenuSubRaw } from './sub';

export const MobileMenu = ({
  children,
  items,
  contentOptions: {
    className,
    onPointerDownOutside,
    onInteractOutside,
    // ignore the following props
    sideOffset: _sideOffset,
    side: _side,
    align: _align,

    ...otherContentOptions
  } = {},
  rootOptions,
}: MenuProps) => {
  const [subMenus, setSubMenus] = useState<SubMenuContent[]>([]);
  const [open, setOpen] = useState(false);
  const mobileContextValue = {
    subMenus,
    setSubMenus,
    setOpen,
  };

  const { removeSubMenu, removeAllSubMenus } =
    useMobileSubMenuHelper(mobileContextValue);

  const [sliderHeight, setSliderHeight] = useState(0);
  const [sliderElement, setSliderElement] = useState<HTMLDivElement | null>(
    null
  );
  const { setOpen: pSetOpen } = useContext(MobileMenuContext);
  const finalOpen = rootOptions?.open ?? open;

  // always show the last submenu, if any
  const activeIndex = subMenus.length;

  // dynamic height for slider
  useEffect(() => {
    if (sliderElement && finalOpen) {
      const active = sliderElement.querySelector(
        `.${styles.menuContent}[data-index="${activeIndex}"]`
      );
      if (!active) return;

      // for the situation that content is loaded asynchronously
      return observeResize(active, entry => {
        setSliderHeight(entry.borderBoxSize[0].blockSize);
      });
    }
    return;
  }, [activeIndex, finalOpen, sliderElement]);

  const onOpenChange = useCallback(
    (open: boolean) => {
      if (!open) {
        // a workaround to hack the onPointerDownOutside event
        onPointerDownOutside?.({} as any);
        onInteractOutside?.({} as any);
        removeAllSubMenus();
      }
      setOpen(open);
      rootOptions?.onOpenChange?.(open);
    },
    [onInteractOutside, onPointerDownOutside, removeAllSubMenus, rootOptions]
  );

  const onItemClick = useCallback(
    (e: any) => {
      e.preventDefault();
      onOpenChange(!open);
    },
    [onOpenChange, open]
  );

  const t = useI18n();

  /**
   * For cascading menu usage
   * ```tsx
   * <Menu
   *  items={
   *    <Menu>Click me</Menu>
   *  }
   * >
   *  Root
   * </Menu>
   * ```
   */
  if (pSetOpen) {
    return (
      <MobileMenuSubRaw items={items} subOptions={rootOptions}>
        {children}
      </MobileMenuSubRaw>
    );
  }

  return (
    <>
      <Slot onClick={onItemClick}>{children}</Slot>
      <MobileMenuContext.Provider
        value={{ subMenus, setSubMenus, setOpen: onOpenChange }}
      >
        <Modal
          open={finalOpen}
          onOpenChange={onOpenChange}
          width="100%"
          animation="slideBottom"
          withoutCloseButton={true}
          contentOptions={{
            className: clsx(className, styles.mobileMenuModal),
            ...otherContentOptions,
          }}
          disableAutoFocus={true}
        >
          <div
            ref={setSliderElement}
            className={styles.slider}
            style={{
              transform: `translateX(-${100 * activeIndex}%)`,
              height: sliderHeight,
            }}
          >
            <div data-index={0} className={styles.menuContent}>
              {items}
            </div>
            {subMenus.map((sub, index) => (
              <div
                key={sub.id}
                data-index={index + 1}
                className={styles.menuContent}
              >
                <Button
                  data-testid="mobile-menu-back-button"
                  variant="plain"
                  className={styles.backButton}
                  prefix={<ArrowLeftSmallIcon />}
                  onClick={() => {
                    removeSubMenu(sub.id);
                  }}
                  prefixStyle={{ width: 24, height: 24 }}
                >
                  {sub.title || t['com.affine.backButton']()}
                </Button>
                <Scrollable.Root>
                  <Scrollable.Viewport className={styles.scrollArea}>
                    {sub.items}
                  </Scrollable.Viewport>
                  <Scrollable.Scrollbar />
                </Scrollable.Root>
              </div>
            ))}
          </div>
        </Modal>
      </MobileMenuContext.Provider>
    </>
  );
};