import useSWR from 'swr'

function Profile() {
  const { data, error, isLoading } = useSWR('/api/user', fetcher)

  if (error) return 
Failed to load
  if (isLoading) return 
Loading...

  return (
    

      
Hello {data.name}!
      
Role: {data.role}
    
  )
}

// Global SWR configuration
export const SWRConfig = {
  fetcher: (url) => fetch(url).then((res) => res.json()),
  revalidateOnFocus: false,
  revalidateOnReconnect: true
}

import { useQuery } from '@tanstack/react-query'

function TodoList() {
  const { data, isLoading, error } = useQuery({
    queryKey: ['todos'],
    queryFn: () => fetch('/api/todos').then((res) => res.json())
  })

  if (isLoading) return 
Loading todos...
  if (error) return 
Error: {error.message}

  return (
    

      {data.map((todo) => (
        
{todo.title}
      ))}
    
  )
}

// pages/dashboard.tsx
export default function Dashboard({ user, analytics }) {
  return (
    

      
Welcome back, {user.name}
      

        
Views: {analytics.views}
        
Conversions: {analytics.conversions}
      
    
  )
}

export async function getServerSideProps(context) {
  // Check authentication
  const session = await getSession(context)
  if (!session) {
    return {
      redirect: {
        destination: '/login',
        permanent: false,
      },
    }
  }

  // Fetch data
  const user = await fetchUser(session.userId)
  const analytics = await fetchAnalytics(user.id)

  return {
    props: {
      user,
      analytics,
    },
  }
}

// pages/api/analytics.ts
import { NextApiRequest, NextApiResponse } from 'next'
import { getSession } from 'next-auth/react'

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
  const session = await getSession({ req })
  if (!session) {
    return res.status(401).json({ error: 'Unauthorized' })
  }

  const analytics = await prisma.analytics.findMany({
    where: { userId: session.user.id },
    orderBy: { date: 'desc' },
    take: 7
  })

  res.status(200).json(analytics)
}

// pages/blog/[slug].tsx
export default function BlogPost({ post }) {
  return (
    

      
{post.title}
      

    
  )
}

export async function getStaticPaths() {
  const posts = await getAllPosts()
  const paths = posts.map((post) => ({
    params: { slug: post.slug }
  }))

  return {
    paths,
    fallback: 'blocking'
  }
}

export async function getStaticProps({ params }) {
  const post = await getPostBySlug(params.slug)
  
  return {
    props: { post },
    revalidate: 60 // ISR: update every minute
  }
}

// pages/api/revalidate.ts
export default async function handler(req, res) {
  // Check for secret to confirm this is a valid request
  if (req.query.secret !== process.env.REVALIDATE_TOKEN) {
    return res.status(401).json({ message: 'Invalid token' })
  }

  try {
    // Revalidate the home page
    await res.revalidate('/')
    
    // Revalidate a blog post
    await res.revalidate(`/blog/${req.query.slug}`)
    
    return res.json({ revalidated: true })
  } catch (err) {
    return res.status(500).send('Error revalidating')
  }
}