import request from "@/utils/request";

// 学生页面和全局“补充步骤”导航会在同一轮路由渲染中读取同一任务配置。
// 仅合并进行中的请求：教师保存后下一次读取仍会获得最新配置，不引入陈旧缓存。
const pendingTaskRequests = new Map();

function notifyStudentTaskConfigLoading(taskKey, loading) {
  if (typeof window === "undefined") return;
  window.dispatchEvent(new CustomEvent("student-task-config-loading", { detail: { taskKey, loading } }));
}

export function listTrainingTasks(params) {
  return request({
    url: "/api/training-tasks",
    method: "get",
    params,
  });
}

export function getTrainingTaskByKey(taskKey) {
  const normalizedTaskKey = String(taskKey || "").trim();
  if (pendingTaskRequests.has(normalizedTaskKey)) {
    return pendingTaskRequests.get(normalizedTaskKey);
  }
  notifyStudentTaskConfigLoading(normalizedTaskKey, true);
  const requestPromise = request({
    url: `/api/training-tasks/key/${normalizedTaskKey}`,
    method: "get",
  });
  pendingTaskRequests.set(normalizedTaskKey, requestPromise);
  requestPromise.then(
    () => {
      pendingTaskRequests.delete(normalizedTaskKey);
      notifyStudentTaskConfigLoading(normalizedTaskKey, false);
    },
    () => {
      pendingTaskRequests.delete(normalizedTaskKey);
      notifyStudentTaskConfigLoading(normalizedTaskKey, false);
    }
  );
  return requestPromise;
}

export function updateTrainingTask(id, data) {
  return request({
    url: `/api/training-tasks/${id}`,
    method: "put",
    data,
  });
}

export function createTrainingTask(data) {
  return request({
    url: "/api/training-tasks",
    method: "post",
    data,
  });
}

export function importTrainingTasks(file) {
  const data = new FormData();
  data.append("file", file);
  return request({
    url: "/api/training-tasks/import",
    method: "post",
    data,
    headers: { "Content-Type": "multipart/form-data" },
  });
}

export function downloadTrainingTaskTemplate() {
  return request({
    url: "/api/training-tasks/template",
    method: "get",
    responseType: "blob",
  });
}

export function uploadTrainingTaskMaterial(data) {
  return request({
    url: "/common/upload",
    method: "post",
    data,
    headers: {
      "Content-Type": "multipart/form-data",
      repeatSubmit: false,
    },
  });
}

export function listClassTrainingTasks(teachingClassId, params) {
  return request({
    url: `/api/training-tasks/classes/${teachingClassId}`,
    method: "get",
    params,
  });
}

export function getClassTrainingTaskByKey(teachingClassId, taskKey) {
  return request({
    url: `/api/training-tasks/classes/${teachingClassId}/key/${taskKey}`,
    method: "get",
  });
}

export function saveClassTrainingTask(teachingClassId, taskKey, data) {
  return request({
    url: `/api/training-tasks/classes/${teachingClassId}/${taskKey}`,
    method: "put",
    data,
  });
}

export function restoreClassTrainingTaskDefault(teachingClassId, taskKey) {
  return request({
    url: `/api/training-tasks/classes/${teachingClassId}/${taskKey}/override`,
    method: "delete",
  });
}

export function restoreClassTrainingTasksDefaults(teachingClassId) {
  return request({
    url: `/api/training-tasks/classes/${teachingClassId}/overrides`,
    method: "delete",
  });
}