84 lines
2.6 KiB
TypeScript
84 lines
2.6 KiB
TypeScript
'use client'
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import { useEffect } from 'react'
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interface ThemeInitializerProps {
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theme?: string
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fontSize?: string
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}
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export function ThemeInitializer({ theme, fontSize }: ThemeInitializerProps) {
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useEffect(() => {
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// Helper to apply theme
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const applyTheme = (t?: string) => {
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if (!t) return
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const root = document.documentElement
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// Reset
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root.removeAttribute('data-theme')
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root.classList.remove('dark')
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if (t === 'auto') {
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const systemDark = window.matchMedia('(prefers-color-scheme: dark)').matches
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if (systemDark) root.classList.add('dark')
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} else if (t === 'dark') {
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root.classList.add('dark')
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} else if (t === 'light') {
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// Default, nothing needed usually if light is default, but ensuring no 'dark' class
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} else {
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// Named theme
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root.setAttribute('data-theme', t)
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// Check if theme implies dark mode (e.g. midnight)
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if (['midnight'].includes(t)) {
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root.classList.add('dark')
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}
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}
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}
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// Helper to apply font size
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const applyFontSize = (s?: string) => {
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const size = s || 'medium'
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const fontSizeMap: Record<string, string> = {
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'small': '14px',
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'medium': '16px',
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'large': '18px',
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'extra-large': '20px'
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}
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const fontSizeFactorMap: Record<string, number> = {
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'small': 0.95,
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'medium': 1.0,
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'large': 1.1,
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'extra-large': 1.25
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}
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const root = document.documentElement
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root.style.setProperty('--user-font-size', fontSizeMap[size] || '16px')
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root.style.setProperty('--user-font-size-factor', (fontSizeFactorMap[size] || 1).toString())
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}
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// CRITICAL: Use localStorage as the source of truth (it's always fresh)
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// Server prop may be stale due to caching.
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const localTheme = localStorage.getItem('theme-preference')
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const effectiveTheme = localTheme || theme
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applyTheme(effectiveTheme)
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// Only sync to localStorage if it was empty (first visit after login)
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// NEVER overwrite with server value if localStorage already has a value
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if (!localTheme && theme) {
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localStorage.setItem('theme-preference', theme)
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}
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applyFontSize(fontSize)
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}, [theme, fontSize])
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return null
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}
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