import { NextResponse } from "next/server";
import { prisma } from "@/lib/db";
import { getActiveAccountId } from "@/lib/account-context";
import { enqueueJob, findActiveJob } from "@/lib/jobs/runner";
import { scheduleBackgroundJob } from "@/lib/jobs/schedule";

export async function POST(request: Request) {
  try {
    const { topicId, brief } = (await request.json()) as {
      topicId?: string;
      brief?: string | null;
    };
    if (!topicId) {
      return NextResponse.json({ error: "缺少 topicId" }, { status: 400 });
    }

    const accountId = await getActiveAccountId();
    const topic = await prisma.topic.findUnique({ where: { id: topicId } });
    if (!topic || (accountId && topic.accountId !== accountId)) {
      return NextResponse.json({ error: "找不到主題" }, { status: 404 });
    }

    const existing = await findActiveJob(topicId, "analyze-topic");
    if (existing) {
      return NextResponse.json({
        jobId: existing.id,
        status: existing.status,
        message: "已有分析任務在背景執行中",
      });
    }

    const job = await enqueueJob({
      type: "analyze-topic",
      topicId,
      label: `${topic.label} · AI 研究地圖`,
      payload: { topicId, brief },
    });

    scheduleBackgroundJob(job.id);

    return NextResponse.json({
      jobId: job.id,
      status: "pending",
      message: "已於背景執行，可自由切換頁面",
    });
  } catch (error) {
    const message = error instanceof Error ? error.message : "分析失敗";
    return NextResponse.json({ error: message }, { status: 500 });
  }
}