import { NextRequest, NextResponse } from "next/server";
import { prisma } from "@/lib/db";

export async function POST(req: NextRequest) {
  const body = await req.json();
  const { participant_id, split_ids } = body as {
    participant_id?: number;
    split_ids?: number[];
  };

  const now = new Date();

  if (participant_id) {
    const result = await prisma.transaction_splits.updateMany({
      where: { participant_id, settled: false },
      data: { settled: true, settled_at: now },
    });
    return NextResponse.json({ settled: result.count });
  }

  if (split_ids?.length) {
    const result = await prisma.transaction_splits.updateMany({
      where: { id: { in: split_ids }, settled: false },
      data: { settled: true, settled_at: now },
    });
    return NextResponse.json({ settled: result.count });
  }

  return NextResponse.json({ error: "participant_id or split_ids required" }, { status: 400 });
}