auth.ts

import { Lucia } from 'lucia'
import { PrismaAdapter } from '@lucia-auth/adapter-prisma'
import prisma from '@/lib/prisma'
import { cache } from 'react'

import type { Session, User } from 'lucia'
import { cookies } from 'next/headers'

const adapter = new PrismaAdapter(prisma.session, prisma.user)

// expect error (see next section)
export const lucia = new Lucia(adapter, {
  sessionCookie: {
    attributes: {
      secure: process.env.NODE_ENV === 'production',
    },
    expires: false,
  },

  getUserAttributes: (attributes) => {
    return {
      name: attributes.name,
      email: attributes.email,
      diet: attributes.diet,
    }
  },
})

export const validateRequest = cache(
  async (): Promise<
    { user: User; session: Session } | { user: null; session: null }
  > => {
    const sessionId = cookies().get(lucia.sessionCookieName)?.value ?? null
    if (!sessionId) {
      return {
        user: null,
        session: null,
      }
    }

    const result = await lucia.validateSession(sessionId)
    // next.js throws when you attempt to set cookie when rendering page
    try {
      if (result.session && result.session.fresh) {
        const sessionCookie = lucia.createSessionCookie(result.session.id)
        cookies().set(
          sessionCookie.name,
          sessionCookie.value,
          sessionCookie.attributes
        )
      }
      if (!result.session) {
        const sessionCookie = lucia.createBlankSessionCookie()
        cookies().set(
          sessionCookie.name,
          sessionCookie.value,
          sessionCookie.attributes
        )
      }
    } catch {}
    return result
  }
)

declare module 'lucia' {
  interface Register {
    Lucia: typeof lucia
    DatabaseUserAttributes: DatabaseUserAttributes
  }
}

interface DatabaseUserAttributes {
  email: string
  name: string
  diet: string
}