/*
 * Copyright 2025 Daytona Platforms Inc.
 * SPDX-License-Identifier: AGPL-3.0
 */

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

type Theme = 'dark' | 'light'

type ThemeProviderProps = {
  children: React.ReactNode
  defaultTheme?: Theme
  storageKey?: string
}

type ThemeProviderState = {
  theme: Theme
  setTheme: (theme: Theme) => void
}

const initialState: ThemeProviderState = {
  theme: 'dark',
  setTheme: () => null,
}

const ThemeProviderContext = createContext<ThemeProviderState>(initialState)

async function runWithoutAnimation<T>(callback: () => T | Promise<T>): Promise<T> {
  const style = document.createElement('style')
  style.appendChild(
    document.createTextNode(`*, *::before, *::after { transition: none !important; animation: none !important; }`),
  )
  document.head.appendChild(style)

  try {
    return await callback()
  } finally {
    window.getComputedStyle(document.body)

    setTimeout(() => {
      if (document.head.contains(style)) {
        document.head.removeChild(style)
      }
    }, 1)
  }
}

export function ThemeProvider({
  children,
  defaultTheme = 'dark',
  storageKey = 'vite-ui-theme',
  ...props
}: ThemeProviderProps) {
  const [theme, setTheme] = useState<Theme>(() => (localStorage.getItem(storageKey) as Theme) || defaultTheme)

  useEffect(() => {
    runWithoutAnimation(() => {
      const root = window.document.documentElement

      root.classList.remove('light', 'dark')

      root.classList.add(theme)
    })
  }, [theme])

  const value = {
    theme,
    setTheme: (theme: Theme) => {
      localStorage.setItem(storageKey, theme)
      setTheme(theme)
    },
  }

  return (
    <ThemeProviderContext.Provider {...props} value={value}>
      {children}
    </ThemeProviderContext.Provider>
  )
}

export const useTheme = () => {
  const context = useContext(ThemeProviderContext)

  if (context === undefined) throw new Error('useTheme must be used within a ThemeProvider')

  return context
}
