import { NextRequest, NextResponse } from "next/server"
import { prisma } from "@/lib/db"
import { getNextExercise } from "@/lib/curriculum/engine"

export async function GET(request: NextRequest) {
  try {
    const childId = request.nextUrl.searchParams.get("childId")
    const topic = request.nextUrl.searchParams.get("topic") || "lectura"
    if (!childId) {
      return NextResponse.json({ error: "childId required" }, { status: 400 })
    }

    const child = await prisma.child.findUnique({
      where: { id: childId },
      select: { profile: true },
    })

    if (!child) {
      return NextResponse.json({ error: "child not found" }, { status: 404 })
    }

    const profile = (request.nextUrl.searchParams.get("profile") || child.profile || "ISABELLA").toUpperCase()
    const exercise = await getNextExercise(childId, topic, profile)
    return NextResponse.json(exercise || { id: null, done: true })
  } catch (error) {
    console.error("[curriculum/next] error:", error)
    return NextResponse.json({ error: "Internal error" }, { status: 500 })
  }
}