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import { ref, onMounted, watch } from 'vue';
const THEME_KEY = 'theme';
const THEMES = {
LIGHT: 'light',
DARK: 'dark'
} as const;
export const useTheme = () => {
const isDark = ref(false);
const setTheme = (theme: typeof THEMES[keyof typeof THEMES]) => {
document.documentElement.setAttribute('data-theme', theme);
localStorage.setItem(THEME_KEY, theme);
isDark.value = theme === THEMES.DARK;
};
const toggleTheme = () => {
setTheme(isDark.value ? THEMES.LIGHT : THEMES.DARK);
};
onMounted(() => {
const savedTheme = localStorage.getItem(THEME_KEY) as typeof THEMES[keyof typeof THEMES] | null;
const prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
if (savedTheme) {
setTheme(savedTheme);
} else {
setTheme(prefersDark ? THEMES.DARK : THEMES.LIGHT);
}
});
watch(() => window.matchMedia('(prefers-color-scheme: dark)').matches, (isDarkMode) => {
if (!localStorage.getItem(THEME_KEY)) {
setTheme(isDarkMode ? THEMES.DARK : THEMES.LIGHT);
}
});
return {
isDark,
toggleTheme
};
};