import { NextRequest } from "next/server";
import {
  createTask,
  getEstimatedTime,
  findRunningTaskByEnglishName,
  processTask,
} from "@/lib/testcase-backend";

export async function POST(req: NextRequest) {
  try {
    const body = await req.json();
    const {
      title,
      englishName,
      description,
      standardCode,
      serviceLevel = "standard",
      testCaseCount: rawCount,
    } = body;

    if (!title || !englishName || !description || !standardCode) {
      return Response.json(
        { success: false, error: "请填写必填字段：题目标题、题目英文名、题目描述、C++标准程序" },
        { status: 400 }
      );
    }

    if (!/^[a-z][a-z0-9_]*$/.test(String(englishName).trim())) {
      return Response.json(
        { success: false, error: "题目英文名格式错误：只能包含小写字母、数字和下划线，必须以字母开头" },
        { status: 400 }
      );
    }

    const testCaseCount = Math.min(100, Math.max(1, parseInt(String(rawCount), 10) || 10));

    const existing = findRunningTaskByEnglishName(String(englishName));
    if (existing) {
      return Response.json(
        { success: false, error: "相同英文名的任务正在处理中，请稍后再试或使用不同的英文名" },
        { status: 409 }
      );
    }

    const taskId = "task_" + Date.now() + "_" + Math.random().toString(36).slice(2, 11);
    createTask(taskId, {
      title: String(title).trim(),
      englishName: String(englishName).trim().toLowerCase(),
      description: String(description).trim(),
      standardCode: String(standardCode).trim(),
      testCaseCount,
      serviceLevel: String(serviceLevel),
    });

    setImmediate(() => {
      processTask(taskId).catch((err) => {
        console.error(`[testcase] processTask error:`, err);
      });
    });

    const estimated_time = getEstimatedTime(String(serviceLevel), testCaseCount);
    return Response.json({
      success: true,
      task_id: taskId,
      message: "任务已创建，正在处理中...",
      estimated_time,
    });
  } catch (e) {
    const message = e instanceof Error ? e.message : String(e);
    return Response.json(
      { success: false, error: "创建任务时发生错误，请重试：" + message },
      { status: 500 }
    );
  }
}