import React, { useMemo, useState } from 'react';
import { Dropdown } from 'antd';
import type { MenuProps } from 'antd';
import {
  ArrowRightLeft,
  Car,
  CircleDollarSign,
  Download,
  Eye,
  FileText,
  MoreHorizontal,
  OctagonX,
  Pencil,
  RefreshCw,
  Settings2,
  Trash2,
  Undo2,
  Upload,
  Users,
  type LucideIcon,
} from 'lucide-react';

export type OperationActionItem = {
  key: string;
  label: string;
  onClick: () => void;
  danger?: boolean;
  disabled?: boolean;
  hidden?: boolean;
  icon?: LucideIcon;
};

const MORE_ACTION_ICONS: Record<string, LucideIcon> = {
  edit: Pencil,
  del: Trash2,
  delete: Trash2,
  addVehicle: Car,
  renew: RefreshCw,
  authorized: FileText,
  extraFee: CircleDollarSign,
  toTripartite: Users,
  terminate: OctagonX,
  withdraw: Undo2,
  toFormal: ArrowRightLeft,
  stampSupplement: Upload,
  uploadStamped: Upload,
  manage: Settings2,
  preview: Eye,
  download: Download,
};

function renderMenuItemLabel(item: OperationActionItem) {
  const Icon = item.icon ?? MORE_ACTION_ICONS[item.key];
  return (
    <span
      className={[
        'vm-op-menu-item',
        item.danger ? 'vm-op-menu-item--danger' : '',
      ].filter(Boolean).join(' ')}
    >
      {Icon ? (
        <Icon className="vm-op-menu-item__icon" aria-hidden strokeWidth={1.75} />
      ) : (
        <span className="vm-op-menu-item__icon-spacer" aria-hidden />
      )}
      <span className="vm-op-menu-item__label">{item.label}</span>
    </span>
  );
}

export type OperationPrimaryAction = {
  onClick: () => void;
  label?: string;
  hidden?: boolean;
  disabled?: boolean;
};

export type OperationActionsProps = {
  /** 详情：固定外显主操作 */
  view?: OperationPrimaryAction;
  /**
   * @deprecated 编辑已收入「更多」下拉，请放入 more 数组
   */
  edit?: OperationPrimaryAction;
  /** 其余操作（含编辑）收入「更多」下拉 */
  more?: OperationActionItem[];
  /** 更多按钮文案，默认「更多」 */
  moreLabel?: string;
  className?: string;
  annotationId?: string;
};

function ViewIcon() {
  return <Eye className="vm-op-action__icon" aria-hidden />;
}

function MoreIcon() {
  return <MoreHorizontal className="vm-op-action__icon" aria-hidden />;
}

const PrimaryActionButton = React.forwardRef<
  HTMLButtonElement,
  {
    icon: 'view' | 'more';
    label: string;
    onClick?: (event: React.MouseEvent<HTMLButtonElement>) => void;
    disabled?: boolean;
    ariaLabel: string;
    ariaHasPopup?: boolean;
    className?: string;
  }
>(function PrimaryActionButton(
  {
    icon,
    label,
    onClick,
    disabled,
    ariaLabel,
    ariaHasPopup,
    className,
  },
  ref,
) {
  return (
    <button
      ref={ref}
      type="button"
      className={['vm-op-action', className].filter(Boolean).join(' ')}
      aria-label={ariaLabel}
      aria-haspopup={ariaHasPopup ? 'menu' : undefined}
      disabled={disabled}
      onClick={onClick}
    >
      {icon === 'view' ? <ViewIcon /> : <MoreIcon />}
      <span className="vm-op-action__label">{label}</span>
    </button>
  );
});

function mergeMoreItems(
  more: OperationActionItem[],
  edit?: OperationPrimaryAction,
): OperationActionItem[] {
  const visibleMore = more.filter((item) => !item.hidden);
  if (!edit || edit.hidden) return visibleMore;
  const hasEdit = visibleMore.some((item) => item.key === 'edit' || item.label === '编辑');
  if (hasEdit) return visibleMore;
  return [
    {
      key: 'edit',
      label: edit.label || '编辑',
      onClick: edit.onClick,
      disabled: edit.disabled,
    },
    ...visibleMore,
  ];
}

export function OperationActions({
  view,
  edit,
  more = [],
  moreLabel = '更多',
  className,
  annotationId,
}: OperationActionsProps) {
  const [moreOpen, setMoreOpen] = useState(false);
  const visibleMore = useMemo(
    () => mergeMoreItems(more, edit),
    [more, edit],
  );

  const menuItems: MenuProps['items'] = useMemo(() => {
    const items: MenuProps['items'] = [];
    visibleMore.forEach((item, index) => {
      if (item.danger && index > 0 && !visibleMore[index - 1]?.danger) {
        items.push({ type: 'divider' });
      }
      items.push({
        key: item.key,
        label: renderMenuItemLabel(item),
        danger: item.danger,
        disabled: item.disabled,
        className: item.danger ? 'vm-op-dropdown-menu-item--danger' : undefined,
      });
    });
    return items;
  }, [visibleMore]);

  const showView = !!(view && !view.hidden);
  const showMore = visibleMore.length > 0;

  if (!showView && !showMore) {
    return <span className="vm-operation-actions vm-operation-actions--empty">-</span>;
  }

  const handleMenuClick: MenuProps['onClick'] = ({ key, domEvent }) => {
    domEvent.stopPropagation();
    const target = visibleMore.find((item) => item.key === key);
    if (target && !target.disabled) target.onClick();
  };

  return (
    <div
      className={['vm-row-actions', 'vm-operation-actions', className].filter(Boolean).join(' ')}
      data-annotation-id={annotationId}
      onClick={(event) => event.stopPropagation()}
    >
      {showView ? (
        <PrimaryActionButton
          icon="view"
          label={view?.label || '详情'}
          ariaLabel={view?.label || '详情'}
          disabled={view?.disabled}
          onClick={(event) => {
            event.stopPropagation();
            if (!view?.disabled) view!.onClick();
          }}
        />
      ) : null}
      {showMore ? (
        <Dropdown
          menu={{
            items: menuItems,
            onClick: handleMenuClick,
            className: 'vm-op-dropdown-menu',
          }}
          trigger={['click']}
          placement="bottomRight"
          getPopupContainer={() => document.body}
          overlayClassName="vm-op-dropdown"
          open={moreOpen}
          onOpenChange={setMoreOpen}
          align={{ offset: [0, 4] }}
        >
          <PrimaryActionButton
            icon="more"
            label={moreLabel}
            ariaLabel={moreLabel + '操作'}
            ariaHasPopup
            className={moreOpen ? 'vm-op-action--open' : undefined}
          />
        </Dropdown>
      ) : null}
    </div>
  );
}

/**
 * 从扁平操作列表中拆分出 view / more（编辑收入 more）。
 */
export function splitOperationActions(items: OperationActionItem[]): {
  view?: OperationPrimaryAction;
  more: OperationActionItem[];
} {
  const visible = items.filter((item) => !item.hidden);
  const viewItem = visible.find((item) => item.label === '详情' || item.label === '查看' || item.key === 'view');
  const more = visible.filter((item) => item !== viewItem);
  return {
    view: viewItem
      ? {
          onClick: viewItem.onClick,
          label: viewItem.label === '查看' ? '详情' : viewItem.label,
          disabled: viewItem.disabled,
        }
      : undefined,
    more,
  };
}