import { Fragment, memo } from 'react';
import { Group, ActionIcon, Tooltip, Menu, Divider, Box, Button, MantineSpacing } from '@mantine/core';
import { RowActionProps } from './types';
import { getIntentColor } from './utils';
import { MoreVertical } from 'lucide-react';

export interface RowActionsProps {
  /** Array of configured row-level actions. */
  actions: RowActionProps[];
  showLabels?: boolean;
  responsiveView?: boolean;
  gapActionDesktop?: MantineSpacing;
  gapActionMobile?: MantineSpacing;
}

/**
 * A lightweight presentational component optimized for rendering inside data grid rows.
 * Automatically handles tooltip generation and constructs dropdown menus for nested actions.
 *
 * @performance Wrapped in React.memo to guarantee zero overhead inside large lists/grids.
 */
export const RowActions = memo(function RowActions(props: RowActionsProps) {
  const { actions = [], showLabels = false, responsiveView = true, gapActionDesktop = 0, gapActionMobile = 0 } = props;

  /**
   * Helper function to render a standalone item.
   */
  const renderItem = (action: RowActionProps, fallbackKey: string) => {
    const actionKey = action.key || fallbackKey;
    const isButton = showLabels;

    const handleClick = (e: React.MouseEvent) => {
      e.stopPropagation();
      action.onClick?.(action.key || '');
    };

    if (isButton) {
      return (
        <Button
          key={actionKey}
          variant="subtle"
          color={getIntentColor(action.intent)}
          leftSection={action.icon}
          disabled={action.disabled}
          onClick={handleClick}
          size="xs"
        >
          {action.label}
        </Button>
      );
    }

    const iconBtn = (
      <ActionIcon
        key={actionKey}
        variant="subtle"
        color={getIntentColor(action.intent)}
        disabled={action.disabled}
        onClick={handleClick}
        size="md"
      >
        {action.icon}
      </ActionIcon>
    );

    return action.tooltip ? (
      <Tooltip key={`tooltip-${actionKey}`} label={action.tooltip} withArrow withinPortal zIndex={9999}>
        {iconBtn}
      </Tooltip>
    ) : (
      iconBtn
    );
  };

  const renderFlatActions = () => {
    return actions.map((action, index) => {
      if (action.type === 'divider') {
        return <Divider key={`divider-${index}`} orientation="vertical" mr="xs" ml="xs" />;
      }

      if (action.children && action.children.length > 0) {
        return (
          <Menu key={action.key} position="bottom-start" withArrow withinPortal trigger="hover" zIndex={9999}>
            <Menu.Target>{renderItem(action, `action-${index}`)}</Menu.Target>
            <Menu.Dropdown>
              {action.children.map((child, childIndex) => {
                if (child.type === 'divider') {
                  return <Menu.Divider key={`child-divider-${childIndex}`} />;
                }
                return (
                  <Menu.Item
                    key={child.key}
                    leftSection={child.icon}
                    color={getIntentColor(child.intent)}
                    disabled={child.disabled}
                    onClick={(e) => {
                      e.stopPropagation();
                      child.onClick?.(child.key || '');
                    }}
                  >
                    {child.label}
                  </Menu.Item>
                );
              })}
            </Menu.Dropdown>
          </Menu>
        );
      }

      return renderItem(action, `action-${index}`);
    });
  };

  return (
    <Box style={{ display: 'inline-flex' }}>
      {/* --- DESKTOP VIEW (hidden on mobile devices) --- */}
      <Group gap={gapActionDesktop} wrap="nowrap" visibleFrom={responsiveView ? 'sm' : undefined}>
        {renderFlatActions()}
      </Group>

      {/* --- MOBILE VIEW (hidden on desktop devices) --- */}

      {responsiveView && (
        <Group gap={gapActionMobile} wrap="nowrap" hiddenFrom="sm">
          <Menu position="bottom-end" withArrow withinPortal zIndex={9999}>
            <Menu.Target>
              <ActionIcon variant="transparent" size="md">
                <MoreVertical size={16} />
              </ActionIcon>
            </Menu.Target>
            <Menu.Dropdown>
              {actions.map((action, index) => {
                if (action.type === 'divider') {
                  return <Menu.Divider key={`mobile-divider-${index}`} mt="sm" mb="sm" />;
                }

                if (action.children && action.children.length > 0) {
                  return (
                    <Fragment key={action.key}>
                      <Menu.Label>{action.label}</Menu.Label>
                      {action.children.map((child, childIndex) => {
                        if (child.type === 'divider') {
                          return <Menu.Divider key={`mobile-child-divider-${childIndex}`} mt="xs" mb="xs" />;
                        }
                        return (
                          <Menu.Item
                            key={child.key}
                            leftSection={child.icon}
                            color={getIntentColor(child.intent)}
                            disabled={child.disabled}
                            onClick={(e) => {
                              e.stopPropagation();
                              child.onClick?.(child.key || '');
                            }}
                            style={{ paddingLeft: '1.5rem' }}
                            mt="sm"
                            mb="sm"
                          >
                            {child.label}
                          </Menu.Item>
                        );
                      })}
                    </Fragment>
                  );
                }

                return (
                  <Menu.Item
                    key={action.key}
                    leftSection={action.icon}
                    color={getIntentColor(action.intent)}
                    disabled={action.disabled}
                    onClick={(e) => {
                      e.stopPropagation();
                      action.onClick?.(action.key || '');
                    }}
                    mt="sm"
                    mb="sm"
                  >
                    {action.label}
                  </Menu.Item>
                );
              })}
            </Menu.Dropdown>
          </Menu>
        </Group>
      )}
    </Box>
  );
});