src/ThemeContextProvider.tsx


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import { ReactNode, createContext, useMemo, useState } from 'react';
import { ThemeProvider, createTheme } from '@mui/material/styles';
import useMediaQuery from '@mui/material/useMediaQuery';

type ThemeContextType = {
  toggleColorMode: () => void;
}

type ThemeProviderProps = {
  children: ReactNode;
}

export const ThemeContext = createContext<ThemeContextType>({
  toggleColorMode: () => {}
});

function ThemeContextProvider({ children }: ThemeProviderProps) {
  const prefersDarkMode = useMediaQuery('(prefers-color-scheme: dark)');
  const [mode, setMode] = useState<'light' | 'dark'>(
    prefersDarkMode ? 'dark' : 'light'
  );

  const toggleColorMode = () => {
    setMode((prevMode) => (prevMode === 'light' ? 'dark' : 'light'));
  };

  const theme = useMemo(
    () =>
      createTheme({
        palette: {
          mode,
        }
      }),
    [mode]
  );

  return (
    <ThemeContext.Provider value={{ toggleColorMode }}>
      <ThemeProvider theme={theme}>
        {children}
      </ThemeProvider>
    </ThemeContext.Provider>
  );
}

export default ThemeContextProvider;