import React from 'react';
import CloseOutlined from '@ant-design/icons/CloseOutlined';
import FileTextOutlined from '@ant-design/icons/FileTextOutlined';
import classNames from 'classnames';
import CSSMotion from 'rc-motion';
import { useEvent } from 'rc-util';
import useMergedState from 'rc-util/lib/hooks/useMergedState';

import { useZIndex } from '../_util/hooks/useZIndex';
import { devUseWarning } from '../_util/warning';
import type { ConfigConsumerProps } from '../config-provider';
import { ConfigContext } from '../config-provider';
import useCSSVarCls from '../config-provider/hooks/useCSSVarCls';
import { FloatButtonGroupProvider } from './context';
import FloatButton, { floatButtonPrefixCls } from './FloatButton';
import type { FloatButtonGroupProps } from './interface';
import useStyle from './style';

const FloatButtonGroup: React.FC<Readonly<FloatButtonGroupProps>> = (props) => {
  const {
    prefixCls: customizePrefixCls,
    className,
    style,
    shape = 'circle',
    type = 'default',
    placement = 'top',
    icon = <FileTextOutlined />,
    closeIcon,
    description,
    trigger,
    children,
    onOpenChange,
    open: customOpen,
    onClick: onTriggerButtonClick,
    ...floatButtonProps
  } = props;

  const { direction, getPrefixCls, floatButtonGroup } =
    React.useContext<ConfigConsumerProps>(ConfigContext);

  const mergedCloseIcon = closeIcon ?? floatButtonGroup?.closeIcon ?? <CloseOutlined />;

  const prefixCls = getPrefixCls(floatButtonPrefixCls, customizePrefixCls);
  const rootCls = useCSSVarCls(prefixCls);
  const [wrapCSSVar, hashId, cssVarCls] = useStyle(prefixCls, rootCls);

  const groupPrefixCls = `${prefixCls}-group`;

  const isMenuMode = trigger && ['click', 'hover'].includes(trigger);
  const isValidPlacement = placement && ['top', 'left', 'right', 'bottom'].includes(placement);

  const groupCls = classNames(groupPrefixCls, hashId, cssVarCls, rootCls, className, {
    [`${groupPrefixCls}-rtl`]: direction === 'rtl',
    [`${groupPrefixCls}-${shape}`]: shape,
    [`${groupPrefixCls}-${shape}-shadow`]: !isMenuMode,
    [`${groupPrefixCls}-${placement}`]: isMenuMode && isValidPlacement, // 只有菜单模式才支持弹出方向
  });

  // ============================ zIndex ============================
  const [zIndex] = useZIndex('FloatButton', style?.zIndex as number);

  const mergedStyle: React.CSSProperties = { ...style, zIndex };

  const wrapperCls = classNames(hashId, `${groupPrefixCls}-wrap`);

  const [open, setOpen] = useMergedState(false, { value: customOpen });

  const floatButtonGroupRef = React.useRef<HTMLDivElement>(null);

  // ========================== Open ==========================
  const hoverTrigger = trigger === 'hover';
  const clickTrigger = trigger === 'click';

  const triggerOpen = useEvent((nextOpen: boolean) => {
    if (open !== nextOpen) {
      setOpen(nextOpen);
      onOpenChange?.(nextOpen);
    }
  });

  // ===================== Trigger: Hover =====================
  const onMouseEnter: React.MouseEventHandler<HTMLDivElement> = () => {
    if (hoverTrigger) {
      triggerOpen(true);
    }
  };

  const onMouseLeave: React.MouseEventHandler<HTMLDivElement> = () => {
    if (hoverTrigger) {
      triggerOpen(false);
    }
  };

  // ===================== Trigger: Click =====================
  const onInternalTriggerButtonClick: FloatButtonGroupProps['onClick'] = (e) => {
    if (clickTrigger) {
      triggerOpen(!open);
    }
    onTriggerButtonClick?.(e);
  };

  React.useEffect(() => {
    if (clickTrigger) {
      const onDocClick = (e: MouseEvent) => {
        // Skip if click on the group
        if (floatButtonGroupRef.current?.contains(e.target as Node)) {
          return;
        }
        triggerOpen(false);
      };
      document.addEventListener('click', onDocClick, { capture: true });
      return () => document.removeEventListener('click', onDocClick, { capture: true });
    }
  }, [clickTrigger]);

  // ======================== Warning =========================
  if (process.env.NODE_ENV !== 'production') {
    const warning = devUseWarning('FloatButton.Group');

    warning(
      !('open' in props) || !!trigger,
      'usage',
      '`open` need to be used together with `trigger`',
    );
  }

  // ========================= Render =========================
  return wrapCSSVar(
    <FloatButtonGroupProvider value={shape}>
      <div
        ref={floatButtonGroupRef}
        className={groupCls}
        style={mergedStyle}
        // Hover trigger
        onMouseEnter={onMouseEnter}
        onMouseLeave={onMouseLeave}
      >
        {isMenuMode ? (
          <>
            <CSSMotion visible={open} motionName={`${groupPrefixCls}-wrap`}>
              {({ className: motionClassName }) => (
                <div className={classNames(motionClassName, wrapperCls)}>{children}</div>
              )}
            </CSSMotion>
            <FloatButton
              type={type}
              icon={open ? mergedCloseIcon : icon}
              description={description}
              aria-label={props['aria-label']}
              className={`${groupPrefixCls}-trigger`}
              onClick={onInternalTriggerButtonClick}
              {...floatButtonProps}
            />
          </>
        ) : (
          children
        )}
      </div>
    </FloatButtonGroupProvider>,
  );
};

export default FloatButtonGroup;