logos-web/apps/web/components/theme-toggle.tsx

'use client'

import { useEffect, useState } from 'react'

export default function ThemeToggle() {
  const [theme, setTheme] = useState<'light' | 'dark'>('light')

  useEffect(() => {
    const savedTheme = localStorage.getItem('theme') as 'light' | 'dark'
    const systemTheme = window.matchMedia('(prefers-color-scheme: dark)')
      .matches
      ? 'dark'
      : 'light'
    const initialTheme = savedTheme || systemTheme

    setTheme(initialTheme)
    document.documentElement.setAttribute('data-theme', initialTheme)
  }, [])

  const toggleTheme = () => {
    const newTheme = theme === 'dark' ? 'light' : 'dark'
    setTheme(newTheme)
    document.documentElement.setAttribute('data-theme', newTheme)
    localStorage.setItem('theme', newTheme)
  }

  return <button onClick={toggleTheme}>Theme Toggle</button>
}