refactor(legend): Simplify the code and tweak performance

packages/geoview-core/src/core/components/legend/legend-layer-container.tsx

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+import { useTheme } from '@mui/material';
+import { memo } from 'react';
+import { Box, Collapse, List } from '@/ui';
+import { TypeLegendLayer } from '@/core/components/layers/types';
+import { getSxClasses } from './legend-styles';
+import { CV_CONST_LAYER_TYPES } from '@/api/config/types/config-constants';
+import { ItemsList } from './legend-layer-items';
+import { logger } from '@/core/utils/logger';
+
+// Define component types and interfaces
+type LegendLayerType = React.FC<{ layer: TypeLegendLayer }>;
+
+interface CollapsibleContentProps {
+  layer: TypeLegendLayer;
+  legendExpanded: boolean; // Expanded come from store ordered layer info array
+  initLightBox: (imgSrc: string, title: string, index: number, total: number) => void;
+  LegendLayerComponent: LegendLayerType;
+}
+
+interface WMSLegendImageProps {
+  imgSrc: string;
+  initLightBox: (imgSrc: string, title: string, index: number, total: number) => void;
+  legendExpanded: boolean;
+  sxClasses: Record<string, object>;
+}
+
+// Extracted WMS Legend Component
+const WMSLegendImage = memo(
+  ({ imgSrc, initLightBox, legendExpanded, sxClasses }: WMSLegendImageProps): JSX.Element => (
+    <Collapse in={legendExpanded} sx={sxClasses!.collapsibleContainer} timeout="auto">
+      <Box
+        component="img"
+        tabIndex={0}
+        src={imgSrc}
+        sx={{ maxWidth: '90%', cursor: 'pointer' }}
+        onClick={() => initLightBox(imgSrc, '', 0, 2)}
+        onKeyDown={(e) => (e.code === 'Space' || e.code === 'Enter' ? initLightBox(imgSrc, '', 0, 2) : null)}
+      />
+    </Collapse>
+  )
+);
+WMSLegendImage.displayName = 'WMSLegendImage';
+
+export const CollapsibleContent = memo(function CollapsibleContent({
+  layer,
+  legendExpanded,
+  initLightBox,
+  LegendLayerComponent,
+}: CollapsibleContentProps): JSX.Element | null {
+  logger.logTraceRender('components/legend/legend-layer-container');
+
+  // Hooks
+  const theme = useTheme();
+  const sxClasses = getSxClasses(theme);
+
+  // Props extraction
+  const { children, items } = layer;
+
+  // Early returns
+  if (children?.length === 0 && items?.length === 1) return null;
+
+  const isWMSWithLegend = layer.type === CV_CONST_LAYER_TYPES.WMS && layer.icons?.[0]?.iconImage && layer.icons[0].iconImage !== 'no data';
+
+  // If it is a WMS legend, create a specific component
+  if (isWMSWithLegend) {
+    return (
+      <WMSLegendImage
+        imgSrc={layer.icons[0].iconImage || ''}
+        initLightBox={initLightBox}
+        legendExpanded={legendExpanded}
+        sxClasses={sxClasses}
+      />
+    );
+  }
+
+  return (
+    <Collapse in={legendExpanded} sx={sxClasses.collapsibleContainer} timeout="auto">
+      <List>
+        {layer.children
+          .filter((d) => !['error', 'processing'].includes(d.layerStatus ?? ''))
+          .map((item) => (
+            <LegendLayerComponent layer={item} key={item.layerPath} />
+          ))}
+      </List>
+      <ItemsList items={items} />
+    </Collapse>
+  );
+});

packages/geoview-core/src/core/components/legend/legend-layer-ctrl.tsx

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+import { useTheme } from '@mui/material';
+import { useMemo } from 'react';
+import { useTranslation } from 'react-i18next';
+import {
+  Box,
+  IconButton,
+  Stack,
+  VisibilityOutlinedIcon,
+  HighlightOutlinedIcon,
+  ZoomInSearchIcon,
+  Typography,
+  VisibilityOffOutlinedIcon,
+  HighlightIcon,
+} from '@/ui';
+import { useLayerHighlightedLayer, useLayerStoreActions } from '@/core/stores/store-interface-and-intial-values/layer-state';
+import { TypeLegendItem, TypeLegendLayer } from '@/core/components/layers/types';
+import { useMapStoreActions } from '@/core/stores/';
+import { getSxClasses } from './legend-styles';
+import { logger } from '@/core/utils/logger';
+
+interface SecondaryControlsProps {
+  layer: TypeLegendLayer;
+  visibility: boolean; // Visibility come from store ordered layer info array
+}
+
+type ControlActions = {
+  handleToggleVisibility: (e: React.MouseEvent) => void;
+  handleHighlightLayer: (e: React.MouseEvent) => void;
+  handleZoomTo: (e: React.MouseEvent) => void;
+};
+
+// Custom hook for control actions
+const useControlActions = (layerPath: string): ControlActions => {
+  const { setOrToggleLayerVisibility } = useMapStoreActions();
+  const { setHighlightLayer, zoomToLayerExtent } = useLayerStoreActions();
+
+  return useMemo(
+    () => ({
+      handleToggleVisibility: (e: React.MouseEvent): void => {
+        e.stopPropagation();
+        setOrToggleLayerVisibility(layerPath);
+      },
+      handleHighlightLayer: (e: React.MouseEvent): void => {
+        e.stopPropagation();
+        setHighlightLayer(layerPath);
+      },
+      handleZoomTo: (e: React.MouseEvent): void => {
+        e.stopPropagation();
+        zoomToLayerExtent(layerPath).catch((error) => {
+          logger.logPromiseFailed('in zoomToLayerExtent in legend-layer.handleZoomTo', error);
+        });
+      },
+    }),
+    [layerPath, setHighlightLayer, setOrToggleLayerVisibility, zoomToLayerExtent]
+  );
+};
+
+// Create subtitle
+const useSubtitle = (children: TypeLegendLayer[], items: TypeLegendItem[]): string => {
+  // Hooks
+  const { t } = useTranslation();
+
+  return useMemo(() => {
+    if (children.length) {
+      return t('legend.subLayersCount').replace('{count}', children.length.toString());
+    }
+    if (items.length > 1) {
+      return t('legend.itemsCount')
+        .replace('{count}', items.filter((item) => item.isVisible).length.toString())
+        .replace('{totalCount}', items.length.toString());
+    }
+    return '';
+  }, [children.length, items, t]);
+};
+
+// SecondaryControls component
+export function SecondaryControls({ layer, visibility }: SecondaryControlsProps): JSX.Element {
+  logger.logTraceRender('components/legend/legend-layer-ctrl');
+
+  // Hooks
+  const theme = useTheme();
+  const sxClasses = useMemo(() => getSxClasses(theme), [theme]);
+
+  // Stores
+  const highlightedLayer = useLayerHighlightedLayer();
+
+  // Is button disabled?
+  const isLayerVisible = layer.controls?.visibility ?? false;
+
+  // Extract constant from layer prop
+  const { layerStatus, items, children } = layer;
+
+  // Component helper
+  const controls = useControlActions(layer.layerPath);
+  const subTitle = useSubtitle(children, items);
+
+  if (!['processed', 'loaded'].includes(layerStatus || 'error')) {
+    return <Box />;
+  }
+
+  return (
+    <Stack direction="row" alignItems="center" sx={sxClasses.layerStackIcons}>
+      {!!subTitle.length && <Typography fontSize={14}>{subTitle}</Typography>}
+      <Box sx={sxClasses.subtitle}>
+        <IconButton
+          edge="end"
+          tooltip="layers.toggleVisibility"
+          className="buttonOutline"
+          onClick={controls.handleToggleVisibility}
+          disabled={!isLayerVisible}
+        >
+          {visibility ? <VisibilityOutlinedIcon /> : <VisibilityOffOutlinedIcon />}
+        </IconButton>
+        <IconButton
+          tooltip="legend.highlightLayer"
+          sx={{ marginTop: '-0.3125rem' }}
+          className="buttonOutline"
+          onClick={controls.handleHighlightLayer}
+        >
+          {highlightedLayer === layer.layerPath ? <HighlightIcon /> : <HighlightOutlinedIcon />}
+        </IconButton>
+        <IconButton tooltip="legend.zoomTo" className="buttonOutline" onClick={controls.handleZoomTo}>
+          <ZoomInSearchIcon />
+        </IconButton>
+      </Box>
+    </Stack>
+  );
+}

packages/geoview-core/src/core/components/legend/legend-layer-items.tsx

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+import { useTheme } from '@mui/material';
+import { memo, useMemo } from 'react';
+import { Box, ListItem, Tooltip, ListItemText, ListItemIcon, List, BrowserNotSupportedIcon } from '@/ui';
+import { TypeLegendItem } from '@/core/components/layers/types';
+import { getSxClasses } from './legend-styles';
+import { logger } from '@/core/utils/logger';
+
+interface ItemsListProps {
+  items: TypeLegendItem[];
+}
+
+// Extracted ListItem Component
+const LegendListItem = memo(
+  ({ item }: { item: TypeLegendItem }): JSX.Element => (
+    <ListItem key={`${item.icon}-${item.name}`} className={!item.isVisible ? 'unchecked' : 'checked'}>
+      <ListItemIcon>{item.icon ? <Box component="img" alt={item.name} src={item.icon} /> : <BrowserNotSupportedIcon />}</ListItemIcon>
+      <Tooltip title={item.name} placement="top" enterDelay={1000}>
+        <ListItemText primary={item.name} />
+      </Tooltip>
+    </ListItem>
+  )
+);
+LegendListItem.displayName = 'LegendListItem';
+
+export const ItemsList = memo(function ItemsList({ items }: ItemsListProps): JSX.Element | null {
+  logger.logTraceRender('components/legend/legend-layer-items');
+
+  // Hooks
+  const theme = useTheme();
+  const sxClasses = useMemo(() => getSxClasses(theme), [theme]);
+
+  if (!items?.length) return null;
+
+  // Direct mapping since we only reach this code if items has content
+  return (
+    <List sx={sxClasses.subList}>
+      {items.map((item) => (
+        <LegendListItem item={item} key={`${item.icon}-${item.name}`} />
+      ))}
+    </List>
+  );
+});