import { NextRequest, NextResponse } from "next/server";
import { auth } from "@/app/(auth)/auth";
import { executeLayerSplitJob, LayerSplitServiceError } from "@/lib/ai/layer-split/service";

export const runtime = "nodejs";
export const maxDuration = 300;

export async function POST(request: NextRequest) {
  try {
    const session = await auth();
    if (!session?.user?.id) {
      return NextResponse.json({ error: "未授权，请先登录" }, { status: 401 });
    }

    const contentType = request.headers.get("content-type") || "";
    if (!contentType.includes("application/json")) {
      return NextResponse.json(
        { error: "不支持的 Content-Type，请使用 application/json" },
        { status: 400 }
      );
    }

    const body = await request.json();
    const imageUrl = String(body.imageUrl || body.image_url || "").trim();
    if (!imageUrl) {
      return NextResponse.json({ error: "缺少 imageUrl 参数" }, { status: 400 });
    }

    const result = await executeLayerSplitJob({
      userId: session.user.id,
      imageUrl,
      prompt: String(body.prompt || "").trim() || undefined,
      chatId: String(body.chatId || "").trim() || null,
      messageId: String(body.messageId || "").trim() || null,
      sourceNodeId: String(body.sourceNodeId || "").trim() || null,
      skipGallerySave: body.skipGallerySave === true,
    });

    return NextResponse.json({
      success: true,
      ...result,
    });
  } catch (error) {
    if (error instanceof LayerSplitServiceError) {
      return NextResponse.json(
        {
          error: error.message,
          detail: error.detail || error.message,
        },
        { status: error.status }
      );
    }

    console.error("[LayerSplit API] 处理错误:", error);
    return NextResponse.json(
      { error: "服务器内部错误", detail: error instanceof Error ? error.message : "未知错误" },
      { status: 500 }
    );
  }
}