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

export interface PageActionsProps {
  /** Array of configured page-level actions. */
  actions?: PageActionProps[];
  customButtonProps?: (action: PageActionProps) => ButtonProps;
  gapActionDesktop?: MantineSpacing;
  gapActionMobile?: MantineSpacing;
}

/**
 * A responsive and flexible presentational component for page-level actions.
 * Automatically adapts layout based on screen size.
 */
export const PageActions = memo(function PageActions(props: PageActionsProps) {
  const { actions = [], customButtonProps, gapActionDesktop = 'xs', gapActionMobile = 'sm' } = props;
  if (!actions || actions?.length === 0) {
    return null;
  }

  function defaultButtonStyle(isPremiumGlow: boolean) {
    return {
      size: 'sm',
      radius: 'md',
      fw: 500,
      style: isPremiumGlow
        ? { boxShadow: '0 4px 14px 0 color-mix(in srgb, var(--mantine-primary-color-filled) 40%, transparent)' }
        : undefined,
    };
  }

  return (
    <Box style={{ display: 'inline-flex' }}>
      {/* --- DESKTOP VIEW --- */}
      <Group gap={gapActionDesktop} wrap="nowrap" visibleFrom="md">
        {actions.map((action, index) => {
          if (action.type === 'divider') {
            return <Divider key={`divider-${index}`} orientation="vertical" mr="sm" ml="sm" />;
          }

          const isPremiumGlow = action.intent === 'primary' && action.variant === 'filled';
          const showLabel = action.showLabel !== false;
          const tooltipContent = action.tooltipLabel || (!showLabel ? action.label : undefined);

          // 1. Button with Dropdown (Menu.Target)
          if (action.children && action.children.length > 0) {
            const ButtonWithDropdown = showLabel ? (
              <Button
                variant={action.variant || 'transparent'}
                color={action?.color ? action.color : getIntentColor(action.intent)}
                leftSection={action.icon}
                rightSection={<ChevronDown size={14} />}
                disabled={action.disabled}
                {...defaultButtonStyle(isPremiumGlow)}
                {...(customButtonProps ? customButtonProps(action) : {})}
              >
                {action.label}
              </Button>
            ) : (
              <ActionIcon
                variant={action.variant || 'transparent'}
                color={action?.color ? action.color : getIntentColor(action.intent)}
                disabled={action.disabled}
                size="lg"
                style={isPremiumGlow ? defaultButtonStyle(true).style : undefined}
              >
                {action.icon}
              </ActionIcon>
            );

            return (
              <Menu key={action.key} position="bottom-start" withArrow withinPortal trigger="hover">
                <Menu.Target>
                  {tooltipContent ? (
                    <Tooltip position="bottom" label={tooltipContent} withArrow openDelay={500}>
                      {ButtonWithDropdown}
                    </Tooltip>
                  ) : (
                    ButtonWithDropdown
                  )}
                </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={action?.color ? action.color : getIntentColor(child.intent)}
                        disabled={child.disabled}
                        onClick={() => child.onClick?.(child.key || '')}
                      >
                        {child.label}
                      </Menu.Item>
                    );
                  })}
                </Menu.Dropdown>
              </Menu>
            );
          }

          // 2. Regular Button (Standalone)
          const StandaloneButton = showLabel ? (
            <Button
              variant={action.variant || 'transparent'}
              color={action?.color ? action.color : getIntentColor(action.intent)}
              leftSection={action.icon}
              disabled={action.disabled}
              onClick={() => action.onClick?.(action.key || '')}
              {...defaultButtonStyle(isPremiumGlow)}
              {...(customButtonProps ? customButtonProps(action) : {})}
            >
              {action.label}
            </Button>
          ) : (
            <ActionIcon
              variant={action.variant || 'transparent'}
              color={action?.color ? action.color : getIntentColor(action.intent)}
              disabled={action.disabled}
              onClick={() => action.onClick?.(action.key || '')}
              size="lg"
              style={isPremiumGlow ? defaultButtonStyle(true).style : undefined}
            >
              {action.icon}
            </ActionIcon>
          );

          return tooltipContent ? (
            <Tooltip position="bottom" key={action.key} label={tooltipContent} withArrow openDelay={500}>
              {StandaloneButton}
            </Tooltip>
          ) : (
            <Fragment key={action.key}>{StandaloneButton}</Fragment>
          );
        })}
      </Group>

      {/* --- MOBILE VIEW --- */}
      <Group gap={gapActionMobile} wrap="nowrap" hiddenFrom="md">
        <Menu position="bottom-end" withArrow withinPortal>
          <Menu.Target>
            <ActionIcon variant="outline" size="md">
              <MoreVertical size={16} />
            </ActionIcon>
          </Menu.Target>
          <Menu.Dropdown px={'sm'} miw={180}>
            {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={action?.color ? action.color : getIntentColor(child.intent)}
                          disabled={child.disabled}
                          onClick={() => child.onClick?.(child.key || '')}
                          style={{ paddingLeft: '1.5rem' }}
                          mt="sm"
                          mb="sm"
                        >
                          {child.label}
                        </Menu.Item>
                      );
                    })}
                  </Fragment>
                );
              }

              const color = action?.color ? action.color : getIntentColor(action.intent);
              const realColor = color === undefined ? 'brand' : color;

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