'use client'

import { createContext, useContext, useEffect, useState } from 'react'

type Theme = 'light' | 'dark'

const ThemeContext = createContext<{
  theme: Theme
  toggle: () => void
}>({ theme: 'light', toggle: () => {} })

export function ThemeProvider({ children }: { children: React.ReactNode }) {
  const [theme, setTheme] = useState<Theme>('light')

  useEffect(() => {
    const stored = localStorage.getItem('flockoff-theme') as Theme | null
    if (stored === 'dark') {
      setTheme('dark')
      document.documentElement.classList.add('dark')
    }
  }, [])

  const toggle = () => {
    setTheme(prev => {
      const next = prev === 'light' ? 'dark' : 'light'
      localStorage.setItem('flockoff-theme', next)
      document.documentElement.classList.toggle('dark', next === 'dark')
      return next
    })
  }

  return (
    <ThemeContext.Provider value={{ theme, toggle }}>
      {children}
    </ThemeContext.Provider>
  )
}

export function useTheme() {
  return useContext(ThemeContext)
}