import { ref, provide, computed } from 'vue';
import { useRoute } from 'vue-router/composables';

import { taskTypeArray } from './components/data/TaskType';
import { fileStatusList } from '@/utils/file';
import { GetCSItemTaskList, GetCSItemTaskStudentList } from '@/api/course';
import store from '@/store';

/**
 * 文件转换
 * @param {Array} list 文件列表
 * @returns Array
 */
function filesTransform(list) {
  return list.map(({ file_id, file_name, file_size }) => {
    return {
      file: {
        name: file_name,
        size: file_size
      },
      status: { ...fileStatusList[3], id: file_id }
    };
  });
}

/**
 * 转换任务列表数据格式，转换为显示格式
 * @param {Array} list 任务列表
 */
function convertDataFormatTaskList(list) {
  list.forEach((item) => {
    // 学生列表转换为学生id列表
    item.custom_student_id_list = item.custom_student_list.map(({ student_id }) => student_id);
    // 教材转换
    item._coursewares = JSON.parse(JSON.stringify(item.courseware_list));
    // 文件转换
    item._files = filesTransform(item.accessory_list);

    item.child_task_list.forEach(({ info_block_list }) => {
      info_block_list.forEach(({ info_block_type, courseware_list, file_list }, i, arr) => {
        if (info_block_type === 'courseware') {
          arr[i]._coursewares = JSON.parse(JSON.stringify(courseware_list));
          return;
        }
        if (info_block_type === 'file') {
          arr[i]._files = filesTransform(file_list);
          return;
        }
      });
    });
  });
  return list;
}

export function useTask() {
  const route = useRoute();
  const id = route.params.id;
  const task_time_type = Number(route.query.task_time_type);
  const isTeacher = store.getters.isTeacher;

  let curStudentId = ref('');
  let taskData = ref({});
  let taskList = computed(
    () => taskData.value[taskTypeArray.find(({ time_type }) => time_type === task_time_type).sidebarListName]
  );
  provide('taskList', taskList);
  let taskType = computed(() => taskTypeArray.find(({ time_type }) => time_type === task_time_type).type);
  provide('taskType', taskType);
  /**
   * 得到课节任务列表
   * @param {String} studentId 学生ID
   */
  function getCSItemTaskList(studentId) {
    GetCSItemTaskList({
      cs_item_id: id,
      task_time_type,
      data_use: isTeacher ? 'teacher_see_student_task' : 'student_do_task',
      student_id: isTeacher ? studentId : ''
    }).then(({ status, pre_task_list, mid_task_list, after_task_list, ...data }) => {
      if (status !== 1) return;
      taskData.value = {
        pre_task_list: convertDataFormatTaskList(pre_task_list),
        mid_task_list: convertDataFormatTaskList(mid_task_list),
        after_task_list: convertDataFormatTaskList(after_task_list),
        ...data
      };
      curStudentId.value = studentId;
    });
  }

  // 得到学生列表
  let studentList = ref([]);
  GetCSItemTaskStudentList({ cs_item_id: id, task_time_type }).then(({ student_list }) => {
    studentList.value = student_list;
    if (student_list.length > 0) getCSItemTaskList(student_list[0].student_id);
  });

  return {
    taskData,
    studentList,
    curStudentId,
    getCSItemTaskList
  };
}