import { EnumQuestionType } from "@/common/enum";
import { getPaper } from '@/api/modules/study';
import { Study } from "@/types";
import { Question } from "@/types/study";

export const useExam = () => {
  const questionTypeDesc: Record<EnumQuestionType, string> = {
    [EnumQuestionType.SINGLE_CHOICE]: '单选题',
    [EnumQuestionType.MULTIPLE_CHOICE]: '多选题',
    [EnumQuestionType.JUDGMENT]: '判断题',
    [EnumQuestionType.FILL_IN_THE_BLANK]: '填空题',
    [EnumQuestionType.SUBJECTIVE]: '主观题',
    [EnumQuestionType.SHORT_ANSWER]: '简答题',
    [EnumQuestionType.ESSAY]: '问答题',
    [EnumQuestionType.ANALYSIS]: '分析题',
    [EnumQuestionType.OTHER]: '阅读题'
  }
  // 题型顺序
  const questionTypeOrder = [
    EnumQuestionType.SINGLE_CHOICE,
    EnumQuestionType.MULTIPLE_CHOICE,
    EnumQuestionType.JUDGMENT,
    EnumQuestionType.FILL_IN_THE_BLANK,
    EnumQuestionType.SUBJECTIVE,
    EnumQuestionType.SHORT_ANSWER,
    EnumQuestionType.ESSAY,
    EnumQuestionType.ANALYSIS,
    EnumQuestionType.OTHER
  ];
  let interval: NodeJS.Timeout | null = null;
  const countDownCallback = ref<() => void>(() => { });
  // 练习时长
  const practiceDuration = ref<number>(0);
  const formatPracticeDuration = computed(() => {
    const hours = Math.floor(practiceDuration.value / 3600);
    const minutes = Math.floor((practiceDuration.value % 3600) / 60);
    const seconds = practiceDuration.value % 60;
    return `${hours.toString().padStart(2, '0')}:${minutes.toString().padStart(2, '0')}:${seconds.toString().padStart(2, '0')}`;
  });
  // 考试时长
  const examDuration = ref<number>(0);
  const formatExamDuration = computed(() => {
    const hours = Math.floor(examDuration.value / 3600);
    const minutes = Math.floor((examDuration.value % 3600) / 60);
    const seconds = examDuration.value % 60;
    return `${hours.toString().padStart(2, '0')}:${minutes.toString().padStart(2, '0')}:${seconds.toString().padStart(2, '0')}`;
  });
  const swiperDuration = ref<number>(300);
  const questionList = ref<Study.Question[]>([]);
  // 收藏列表
  const favoriteList = ref<Study.Question[]>([]);
  // 不会列表
  const notKnowList = ref<Study.Question[]>([]);
  // 重点标记列表
  const markList = ref<Study.Question[]>([]);
  // 包含状态的问题列表
  const stateQuestionList = computed(() => {
    return questionList.value.map(item => {
      return {
        ...item,
        isDone: isDone(item)
      }
    });
  });
  const groupedQuestionList = computed(() => {
    // 状态：已做、未做、是否不会、是否标记，整体按照题型分组
    const state = questionTypeOrder.map(type => {
      return {
        type,
        list: [] as {
          question: Study.Question;
          index: number
        }[]
      }
    });
    for (let i = 0; i <= questionList.value.length - 1; i++) {
      const qs = questionList.value[i];
      state.forEach(item => {
        if (qs.typeId === item.type) {
          qs.isDone = isDone(qs);
          item.list.push({
            question: qs,
            index: i
          });
        }
      });
    }
    return state;
  });
  const isAllDone = computed(() => {
    return questionList.value.every(q => isDone(q));
  });
  // 当前下标
  const currentIndex = ref<number>(0);
  const totalCount = computed(() => {
    return questionList.value.length;
  });
  const doneCount = computed(() => {
    // 有答案的或者不会做的，都认为是做了
    // return groupedQuestionList.value.reduce((acc, item) => acc + item.list.filter(q => q.question.isDone || q.question.isNotKnow).length, 0);
    return stateQuestionList.value.filter(q => q.isDone || q.isNotKnow).length;
  });
  const notDoneCount = computed(() => {
    // return questionList.value.length - doneCount.value;
    return stateQuestionList.value.length - doneCount.value;
  });
  const notKnowCount = computed(() => {
    // return groupedQuestionList.value.reduce((acc, item) => acc + item.list.filter(q => q.question.isNotKnow).length, 0);
    return stateQuestionList.value.filter(q => q.isNotKnow).length;
  });
  const markCount = computed(() => {
    // return groupedQuestionList.value.reduce((acc, item) => acc + item.list.filter(q => q.question.isMark).length, 0);
    return stateQuestionList.value.filter(q => q.isMark).length;
  });
  const isDone = (qs: Study.Question): boolean => {
    if (qs.subQuestions && qs.subQuestions.length > 0) {
      return qs.subQuestions.every(q => isDone(q));
    }
    return qs.answers && qs.answers.length > 0 || !!qs.isNotKnow;
  }
  const nextQuestion = () => {
    if (currentIndex.value >= questionList.value.length - 1) {
      return;
    }
    currentIndex.value++;
  }
  const prevQuestion = () => {
    if (currentIndex.value <= 0) {
      return;
    }
    currentIndex.value--;
  }
  const nextQuestionQuickly = () => {
    if (currentIndex.value >= questionList.value.length - 1) {
      return;
    }
    swiperDuration.value = 0;
    setTimeout(() => {
      nextQuestion();
      setTimeout(() => {
        swiperDuration.value = 300;
      }, 0);
    }, 0);
  }
  const prevQuestionQuickly = () => {
    if (currentIndex.value <= 0) {
      return;
    }
    swiperDuration.value = 0;
    setTimeout(() => {
      prevQuestion();
      setTimeout(() => {
        swiperDuration.value = 300;
      }, 0);
    }, 0);
  }
  const changeIndex = (index: number) => {
    swiperDuration.value = 0;
    setTimeout(() => {
      currentIndex.value = index;
      setTimeout(() => {
        swiperDuration.value = 300;
      }, 0);
    }, 0);
  }
  // 开始计时
  const startPracticeDuration = () => {
    interval = setInterval(() => {
      practiceDuration.value += 1;
    }, 1000);
  }
  // 停止计时
  const stopPracticeDuration = () => {
    interval && clearInterval(interval);
    interval = null;
  }
  // 开始倒计时
  const startExamDuration = () => {
    interval = setInterval(() => {
      if (examDuration.value <= 0) {
        console.log('停止倒计时')
        stopExamDuration();
        return;
      }
      examDuration.value -= 1;
    }, 1000);
  }
  // 停止倒计时
  const stopExamDuration = () => {
    interval && clearInterval(interval);
    interval = null;
    countDownCallback.value && countDownCallback.value();
  }
  const setExamDuration = (duration: number) => {
    examDuration.value = duration;
  }
  const setPracticeDuration = (duration: number) => {
    practiceDuration.value = duration;
  }
  const setCountDownCallback = (callback: () => void) => {
    countDownCallback.value = callback;
  }
  const setDuration = (duration: number) => {
    examDuration.value = duration;
    practiceDuration.value = duration;
  }
  const setQuestionList = (list: Study.ApiQuestion[]) => {
    const orders = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'];
    // 数据预处理
    // 1、给每个项目补充额外字段
    const parseQuestion = (item: Study.ApiQuestion): Study.Question => {
      return {
        title: item.title,
        // 处理没有题型的大题，统一作为阅读题
        typeId: (item.typeId === null || item.typeId === undefined) ? EnumQuestionType.OTHER : item.typeId,
        id: item.id,
        answers: item.answers || [],
        subQuestions: item.subQuestions?.map(parseQuestion) || [],
        options: item.options?.map((option, index) => {
          return {
            name: option,
            no: orders[index],
            id: index,
            isAnswer: false
          } as Study.QuestionOption
        }) || [],
        isDone: false,
        isMark: item.isMark,
        isNotKnow: item.isNotKnow,
        isFavorite: item.isFavorite
      } as Study.Question
    }
    const arr: Study.Question[] = list.map(item => {
      return parseQuestion(item);
    });
    questionList.value = arr;
  }
  const reset = () => {
    questionList.value = questionList.value.map(item => {
      return {
        ...item,
        answers: [],
        isMark: false,
        isNotKnow: false
      } as Study.Question;
    });
    changeIndex(0);
    practiceDuration.value = 0;
    examDuration.value = 0;
    interval && clearInterval(interval);
    interval = null;
  }
  return {
    questionList,
    groupedQuestionList,
    stateQuestionList,
    favoriteList,
    notKnowList,
    markList,
    currentIndex,
    isAllDone,
    totalCount,
    doneCount,
    notDoneCount,
    notKnowCount,
    markCount,
    questionTypeDesc,
    nextQuestion,
    prevQuestion,
    nextQuestionQuickly,
    prevQuestionQuickly,
    swiperDuration,
    practiceDuration,
    examDuration,
    formatExamDuration,
    formatPracticeDuration,
    startPracticeDuration,
    stopPracticeDuration,
    setDuration,
    startExamDuration,
    stopExamDuration,
    setExamDuration,
    setPracticeDuration,
    setCountDownCallback,
    setQuestionList,
    changeIndex,
    reset
  }
}