import { NextRequest, NextResponse } from 'next/server'
import { prisma } from '@/lib/prisma'

/**
 * Pre-check whether an email exists before sending a magic link.
 * This is a closed platform (no self-registration) so revealing
 * email existence is acceptable and helps users who mistype.
 */
export async function POST(req: NextRequest) {
  try {
    const { email } = await req.json()
    if (!email || typeof email !== 'string') {
      return NextResponse.json({ exists: false }, { status: 400 })
    }

    const user = await prisma.user.findUnique({
      where: { email: email.toLowerCase().trim() },
      select: { status: true },
    })

    const exists = !!user && user.status !== 'SUSPENDED'
    return NextResponse.json({ exists })
  } catch {
    return NextResponse.json({ exists: false }, { status: 500 })
  }
}