crush-level-web/src/context/mainLayout/index.tsx

'use client'
import { createContext, useReducer, useEffect, useState } from 'react'

export * from './useMainLayout'

const MainLayoutContext = createContext<{
  isSidebarExpanded: boolean
  dispatch: (action: { type: 'updateState'; payload: Partial<typeof initialState> }) => void
}>({
  isSidebarExpanded: false,
  dispatch: () => {},
})

const initialState = {
  isSidebarExpanded: false,
}

const reducer = (
  state: typeof initialState,
  action: { type: 'updateState'; payload: Partial<typeof initialState> }
) => {
  switch (action.type) {
    case 'updateState':
      return {
        ...state,
        ...action.payload,
      }
  }
  return state
}

export const MainLayoutProvider = ({ children }: { children: React.ReactNode }) => {
  const [state, dispatch] = useReducer(reducer, initialState)
  const [isHydrated, setIsHydrated] = useState(false)

  // 客户端 hydration 后从 localStorage 恢复状态
  useEffect(() => {
    setIsHydrated(true)
    const saved = localStorage.getItem('sidebarExpanded')
    if (saved !== null) {
      dispatch({
        type: 'updateState',
        payload: {
          isSidebarExpanded: JSON.parse(saved),
        },
      })
    }
  }, [])

  // 当状态改变时保存到 localStorage
  useEffect(() => {
    if (isHydrated) {
      localStorage.setItem('sidebarExpanded', JSON.stringify(state.isSidebarExpanded))
    }
  }, [state.isSidebarExpanded, isHydrated])

  return (
    <MainLayoutContext.Provider value={{ isSidebarExpanded: state.isSidebarExpanded, dispatch }}>
      {children}
    </MainLayoutContext.Provider>
  )
}

export default MainLayoutContext