auth.config.ts

import bcrypt from 'bcryptjs'
import type { NextAuthConfig } from 'next-auth'
import Credentials from 'next-auth/providers/credentials'

import Github from 'next-auth/providers/github'
import Google from 'next-auth/providers/google'
import { LoginSchema } from '@/schemas'
import { getUserByEmail } from '@/data/user'

export default {
  providers: [
    // OAuth authentication providers... the raw data is found at /api/auth/providers
    Github({
      clientId: process.env.GITHUB_CLIENT_ID,
      clientSecret: process.env.GITHUB_CLIENT_SECRET
    }),
    Google({
      clientId: process.env.GOOGLE_CLIENT_ID,
      clientSecret: process.env.GOOGLE_CLIENT_SECRET
    }),

    Credentials({
      async authorize(credentials) {
        const validatedFields = await LoginSchema.safeParse(credentials)

        if (validatedFields.success) {
          const { email, password } = validatedFields.data

          const user = await getUserByEmail(email)
          // by no password I mean that the user is using a social login (Google, Github, etc.)
          if (!user || !user.password) return null

          // check if passwords match
          const passwordsMatch = await bcrypt.compare(password, user.password)
          // if the passwords match, return the user
          if (passwordsMatch) return user
        }
        return null
      }
    })
  ]
} satisfies NextAuthConfig