import { Sidebar } from '@/app/sidebar'

import { auth } from '@/auth'
import { type Metadata } from 'next'

import { Chat } from '@/app/chat'
import { type Chat as ChatType } from '@/lib/types'
import { kv } from '@vercel/kv'
import { Message } from 'ai-connector'

export const runtime = 'edge'
export const preferredRegion = 'home'
export interface ChatPageProps {
  params: {
    id: string
  }
}

export async function generateMetadata({
  params
}: ChatPageProps): Promise<Metadata> {
  const session = await auth()
  const chat = await getChat(params.id, session?.user?.email ?? '')
  return {
    title: chat?.title.slice(0, 50) ?? 'Chat'
  }
}

export default async function ChatPage({ params }: ChatPageProps) {
  const session = await auth()
  const chat = await getChat(params.id, session?.user?.email ?? '')

  return (
    <div className="relative flex h-full w-full overflow-hidden">
      {/* @ts-ignore */}
      <Sidebar session={session} />
      <div className="flex h-full min-w-0 flex-1 flex-col">
        <Chat id={chat.id} initialMessages={chat.messages as Message[]} />
      </div>
    </div>
  )
}

ChatPage.displayName = 'ChatPage'

async function getChat(id: string, userId: string) {
  const chat = await kv.hgetall<ChatType>(`chat:${id}`)
  if (!chat) {
    throw new Error('Not found')
  }

  if (userId && chat.userId !== userId) {
    throw new Error('Unauthorized')
  }

  return chat
}