import { NextResponse } from "next/server"
import { prisma } from "@/lib/db"
import { randomUUID } from "crypto"

export async function POST(request: Request) {
  try {
    const { deviceFingerprint, pairingCode: incomingCode } = await request.json()

    if (incomingCode) {
      // Step 2: Parent's device confirms pairing
      const device = await prisma.device.findFirst({
        where: { deviceFingerprint: incomingCode },
        include: { child: true },
      })

      if (!device) {
        return NextResponse.json({ error: "Código inválido" }, { status: 404 })
      }

      return NextResponse.json({
        success: true,
        childId: device.childId,
        childName: device.child.name,
      })
    }

    // Step 1: Child device requests pairing
    const existingDevice = await prisma.device.findFirst({
      where: { deviceFingerprint },
    })

    if (existingDevice) {
      return NextResponse.json({
        paired: true,
        childId: existingDevice.childId,
      })
    }

    const pairingCode = randomUUID().slice(0, 8)

    return NextResponse.json({
      paired: false,
      pairingCode,
    })
  } catch (error) {
    console.error("Pairing error:", error)
    return NextResponse.json({ error: "Internal error" }, { status: 500 })
  }
}