Stirling-PDF/frontend/src/core/contexts/SidebarContext.tsx

import { createContext, useContext, useState, useRef, useMemo } from 'react';
import { SidebarState, SidebarRefs, SidebarContextValue, SidebarProviderProps } from '@app/types/sidebar';

const SidebarContext = createContext<SidebarContextValue | undefined>(undefined);

export function SidebarProvider({ children }: SidebarProviderProps) {
  // All sidebar state management
  const quickAccessRef = useRef<HTMLDivElement>(null);
  const toolPanelRef = useRef<HTMLDivElement>(null);
  const rightRailRef = useRef<HTMLDivElement>(null);

  const [sidebarsVisible, setSidebarsVisible] = useState(true);
  const [leftPanelView, setLeftPanelView] = useState<'toolPicker' | 'toolContent'>('toolPicker');
  const [readerMode, setReaderMode] = useState(false);

  const sidebarState: SidebarState = useMemo(() => ({
    sidebarsVisible,
    leftPanelView,
    readerMode,
  }), [sidebarsVisible, leftPanelView, readerMode]);

  const sidebarRefs: SidebarRefs = useMemo(() => ({
    quickAccessRef,
    toolPanelRef,
    rightRailRef,
  }), [quickAccessRef, toolPanelRef, rightRailRef]);

  const contextValue: SidebarContextValue = useMemo(() => ({
    sidebarState,
    sidebarRefs,
    setSidebarsVisible,
    setLeftPanelView,
    setReaderMode,
  }), [sidebarState, sidebarRefs, setSidebarsVisible, setLeftPanelView, setReaderMode]);

  return (
    <SidebarContext.Provider value={contextValue}>
      {children}
    </SidebarContext.Provider>
  );
}

export function useSidebarContext(): SidebarContextValue {
  const context = useContext(SidebarContext);
  if (context === undefined) {
    throw new Error('useSidebarContext must be used within a SidebarProvider');
  }
  return context;
}