import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { auth } from "@/app/(auth)/auth";
import { ChatSDKError } from "@/lib/errors";
import { forkAgentPreset } from "@/lib/db/queries";

const forkSchema = z.object({
  name: z.string().trim().min(1).max(128).optional(),
});

export async function POST(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const session = await auth();
    if (!session?.user?.id) {
      return NextResponse.json({ success: false, error: "未登录" }, { status: 401 });
    }

    const { id } = await params;
    const body = await request.json().catch(() => ({}));
    const data = forkSchema.parse(body);

    const preset = await forkAgentPreset({
      id,
      userId: session.user.id,
      name: data.name,
    });

    return NextResponse.json({ success: true, data: preset });
  } catch (error) {
    if (error instanceof ChatSDKError) {
      return error.toResponse();
    }
    if (error instanceof z.ZodError) {
      return NextResponse.json(
        { success: false, error: error.message },
        { status: 400 }
      );
    }
    return NextResponse.json(
      { success: false, error: "复制风格化失败" },
      { status: 500 }
    );
  }
}