import { watch } from "vue";
import { useMarkStore } from "@/store";

export default function useTaskWatch() {
  const markStore = useMarkStore();

  watch(
    () => markStore.currentTask,
    () => {
      // 初始化 task.markResult ，始终保证 task 下有 markResult
      // 1. 评卷时，如果没有 markResult ，则初始化一个 markResult 给它
      // 1. 回评时，先清空它的 markResult ，然后初始化一个 markResult 给它
      if (!markStore.currentTask) return;

      const task = markStore.currentTask;
      if (task.previous && task.markResult) {
        task.markResult = undefined;
      }
      if (!task.markResult) {
        // 管理后台可能不设置 questionList, 而且它不用 markResult
        if (!task.questionList) {
          task.questionList = [];
          // return;
        }
        // 初始化 __index
        task.questionList.forEach((q, i, ar) => (ar[i].__index = i));

        task.__markStartTime = Date.now();
        const statusValue = markStore.setting.statusValue;
        const { examId, studentId, paperNumber } = task;
        task.markResult = {
          examId,
          paperNumber,
          studentId,
          spent: 0,
          statusValue,
          questionList: task.questionList,
          markerTrackList: task.questionList
            .map((q) =>
              q.headerTrackList && q.headerTrackList.length
                ? q.headerTrackList
                : q.markerTrackList
            )
            .flat(),
          markerTagList: task.questionList
            .map((q) => q.markerTagList || [])
            .flat(),
          scoreList: task.questionList.map((q) => q.markerScore),
          markerScore: null, // 后期通过 scoreList 自动更新
        };
        task.markResult.markerTrackList.forEach((t) => {
          if (t.unanswered) {
            t.score = -0;
          }
        });
      }
    }
  );

  // 唯一根据 scoreList 自动更新 markerScore
  watch(
    () => markStore.currentTask?.markResult.scoreList,
    () => {
      if (!markStore.currentTask) return;
      const scoreList = markStore.currentTask.markResult.scoreList.filter(
        (v) => v !== null
      );
      const result =
        scoreList.length === 0
          ? null
          : scoreList.reduce((acc, v) => (acc += Math.round(v * 1000)), 0) /
            1000;
      markStore.currentTask.markResult.markerScore = result;
    },
    { deep: true }
  );
}