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";
import { runScanForAllActiveTopics } from "@/lib/services/scan";

export const maxDuration = 300;

export async function POST(request: Request) {
  try {
    const body = await request.json().catch(() => ({}));
    const accountId = await getActiveAccountId();
    const { topicId, useTags, selectedTags } = body as {
      topicId?: string;
      useTags?: boolean;
      selectedTags?: string[];
    };

    if (topicId) {
      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, "scan");
      if (existing) {
        return NextResponse.json({
          jobId: existing.id,
          status: existing.status,
          message: "已有海巡任務在背景執行中",
        });
      }

      const job = await enqueueJob({
        type: "scan",
        topicId,
        label: `${topic.label} · 標籤海巡`,
        payload: { topicId, useTags, selectedTags },
      });

      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",
      });
    }

    const scans = await runScanForAllActiveTopics(accountId);
    return NextResponse.json({ scans });
  } catch (error) {
    const message = error instanceof Error ? error.message : "海巡失敗";
    return NextResponse.json({ error: message }, { status: 500 });
  }
}