auth.ts

import NextAuth from "next-auth"
import GitHub from "next-auth/providers/github"
import { AUTHOR_BY_GITHUB_ID_QUERY } from "./sanity/lib/queries"
import { client } from "./sanity/lib/client"
import { writeClient } from "./sanity/lib/write-client"

export const { handlers, auth, signIn, signOut } = NextAuth({
	providers: [GitHub],
	callbacks: {
		async signIn({ user: { name, email, image }, account, profile: { id, login, bio } }) {
			const existingUser = await client.withConfig({ useCdn: false }).fetch(AUTHOR_BY_GITHUB_ID_QUERY, { id: id })
			if (!existingUser) {
				await writeClient.create({
					_type: 'author',
					id,
					name,
					username: login,
					email,
					image,
					bio: bio || "",
				})
			}
			return true;
		},
		async jwt({ token, account, profile }) {
			if (account && profile) {
				const user = await client.withConfig({ useCdn: false }).fetch(AUTHOR_BY_GITHUB_ID_QUERY, { id: profile.id })
				token.id = user?.id
				token._id = user?._id
			}
			return token;
		},
		async session({ session, token }) {
			Object.assign(session, { id: token.id, _id: token._id });
			return session;
		}
	}
})