import type { NextAuthOptions, Session, User } from 'next-auth'
import CredentialsProvider from 'next-auth/providers/credentials'
import GoogleProvider from 'next-auth/providers/google'
import { PrismaAdapter } from '@next-auth/prisma-adapter'
import bcrypt from 'bcryptjs'
import { z } from 'zod'
import { UserRole } from '@prisma/client'
import { prisma } from '@/lib/prisma'

const loginSchema = z.object({
  email: z.string().email(),
  password: z.string().min(8),
})

export const authOptions: NextAuthOptions = {
  adapter: PrismaAdapter(prisma),
  session: { strategy: 'jwt' },
  pages: {
    signIn: '/auth/login',
    error: '/auth/login',
  },
  providers: [
    CredentialsProvider({
      name: 'credentials',
      credentials: {
        email: { label: 'Email', type: 'email' },
        password: { label: 'Password', type: 'password' },
      },
      async authorize(credentials) {
        const parsed = loginSchema.safeParse(credentials)
        if (!parsed.success) return null

        const user = await prisma.user.findUnique({
          where: { email: parsed.data.email },
          select: { id: true, email: true, name: true, passwordHash: true, role: true, image: true },
        })

        if (!user || !user.passwordHash) return null

        const valid = await bcrypt.compare(parsed.data.password, user.passwordHash)
        if (!valid) return null

        return { id: user.id, email: user.email, name: user.name, role: user.role, image: user.image }
      },
    }),
    ...(process.env.GOOGLE_CLIENT_ID && process.env.GOOGLE_CLIENT_SECRET
      ? [
          GoogleProvider({
            clientId: process.env.GOOGLE_CLIENT_ID,
            clientSecret: process.env.GOOGLE_CLIENT_SECRET,
          }),
        ]
      : []),
  ],
  callbacks: {
    async jwt({ token, user }) {
      if (user) {
        token.id = user.id
        token.role = (user as User & { role: string }).role
      }
      return token
    },
    async session({ session, token }: { session: Session; token: { id?: string; role?: string } }) {
      if (session.user) {
        session.user.id = token.id as string
        session.user.role = token.role as UserRole
      }
      return session
    },
  },
}