import { cookies } from 'next/headers'

export interface AnonymousSession {
  codeId: string
  sessionHash: string
  roomId?: string
  expiresAt: number
}

const SESSION_COOKIE_NAME = 'letschat_anonymous_session'
const DEFAULT_SESSION_DURATION = 30 * 24 * 60 * 60 * 1000 // 30 dní

export async function setAnonymousSession(session: AnonymousSession) {
  // Await cookies() to avoid sync-access warnings in Next.js runtime
  // Use a permissive any cast because Next's cookie types differ between versions
  // and we only need get/set/delete methods at runtime.
  // @ts-ignore
  const cookieStore = await cookies() as any

  const effectiveExpiresAt = session.expiresAt || (Date.now() + DEFAULT_SESSION_DURATION)
  const maxAgeSeconds = Math.max(1, Math.floor((effectiveExpiresAt - Date.now()) / 1000))

  cookieStore.set(SESSION_COOKIE_NAME, JSON.stringify({ ...session, expiresAt: effectiveExpiresAt }), {
    httpOnly: true,
    secure: process.env.NODE_ENV === 'production',
    sameSite: 'lax',
    maxAge: maxAgeSeconds,
    path: '/'
  })
}

export async function getAnonymousSession(): Promise<AnonymousSession | null> {
  try {
    // @ts-ignore
    const cookieStore = await cookies() as any
    const sessionCookie = cookieStore.get(SESSION_COOKIE_NAME)

    if (!sessionCookie?.value) {
      return null
    }

    const session: AnonymousSession = JSON.parse(sessionCookie.value)

    // Check if session is expired
    if (Date.now() > session.expiresAt) {
      await clearAnonymousSession()
      return null
    }

    return session
  } catch (error) {
    console.error('Error parsing anonymous session:', error)
    await clearAnonymousSession()
    return null
  }
}

export async function clearAnonymousSession() {
  // @ts-ignore
  const cookieStore = await cookies() as any
  // Prefer delete if available, otherwise set cookie to expired
  if (typeof cookieStore.delete === 'function') {
    cookieStore.delete(SESSION_COOKIE_NAME)
  } else {
    cookieStore.set(SESSION_COOKIE_NAME, '', { maxAge: 0, path: '/' })
  }
}