'use server'
import * as z from 'zod'
import { LoginSchema } from '@/schemas'
import { signIn } from '@/auth'
import { AuthError } from 'next-auth'
import { generateVerificationToken } from '@/lib/tokens'
import { getUserByEmail } from '@/data/user'
import { sendVerificationEmail } from '@/lib/mail'

export const login = async (values: z.infer<typeof LoginSchema>) => {
  // Validate fields
  const validatedFields = LoginSchema.safeParse(values)

  // If fields are not valid
  if (!validatedFields.success) {
    return { error: 'Invalid fields' }
  }
  // If fields are valid
  const { email, password } = validatedFields.data
  const exisitingUser = await getUserByEmail(email)

  if (!exisitingUser || !exisitingUser.email || !exisitingUser.password) {
    return { error: 'Email does not exisit' }
  }

  if (!exisitingUser.emailVerified) {
    const verificationToken = await generateVerificationToken(
      exisitingUser.email
    )

    await sendVerificationEmail(
      verificationToken.email,
      verificationToken.token
    )

    return { success: 'Confirmation email sent!' }
  }

  try {
    const result = await signIn('credentials', {
      redirect: false,
      email,
      password
    })

    if (result?.error) {
      return { error: result.error }
    }

    return { success: 'Logged In!' }
  } catch (error) {
    if (error instanceof AuthError) {
      switch (error.type) {
        case 'CredentialsSignin':
          return { error: 'Invalid credentials' }
        default:
          return { error: 'Something went wrong' }
      }
    }
    throw error
  }
}