bd-contest/app/service/Topic.js

'use strict';

const Service = require('../core/base_service');

const { Op } = require('sequelize');

const fileName = "Topic";

class TopicService extends Service {
    // 学生抽取/读取题目
    async topic(uid, answerId) {
        const { ctx } = this;
        try {
            let contestTopic = await ctx.model4.Examination.findOne({ where: { user_uid: uid } });
            if (!contestTopic) {
                const result = await ctx.model4.ChoiceTopic.findAndCountAll();
                // 选择题一共10道，首先获取数据数目
                let bdCardMsg = [];
                // 若不满10道题，则直接将题目 id 放入数组中
                if (result.rows.length < 10 || result.rows.length == 10) {
                    bdCardMsg = result.rows.map(item => item.id);
                } else {
                    // 创建一个空数组来存储随机数
                    let randomNumbers = [];
                    // 循环，直到数组中的元素数量达到十个
                    while (randomNumbers.length < 10) {
                        let arrNum;
                        do {
                            // 获取一个随机数
                            arrNum = Math.floor(Math.random() * result.count);
                        } while (randomNumbers.includes(arrNum)); // 检查随机数是否已存在，如果存在则重新抽取
                        // 将随机数添加到数组中
                        randomNumbers.push(arrNum);
                        // 将随机数作为下标，向 bdCardMsg 数组中添加对应题目数据
                        bdCardMsg.push(result.rows[arrNum].id);
                    }
                }
                const hanzi = "北斗航天科学教育科普导航定位通信";
                const randomCharIndex = Math.floor(Math.random() * hanzi.length);
                const randomChar = hanzi.charAt(randomCharIndex);
                const number = "0123456789";
                const randomNumIndex = Math.floor(Math.random() * number.length);
                const randomNum = number.charAt(randomNumIndex);
                const sensor = ["温度", "湿度", "超声波传感器", "光线"];
                const randomArrCharIndex = Math.floor(Math.random() * sensor.length);
                const randomArrChar = sensor[randomArrCharIndex];
                let sensorData, num;
                if (randomArrChar == "温度") {
                    num = Math.floor(Math.random() * 899) + 100;
                    num = num.toString().slice(0, -1) + "." + num.toString().slice(-1);
                    sensorData = "温度" + num + "度";
                } else if (randomArrChar == "湿度") {
                    num = Math.floor(Math.random() * 899) + 100;
                    num = num.toString().slice(0, -1) + "." + num.toString().slice(-1);
                    sensorData = "湿度" + num + "%";
                } else if (randomArrChar == "超声波传感器") {
                    num = Math.floor(Math.random() * 89) + 10;
                    sensorData = "距离" + num + "厘米";
                } else if (randomArrChar == "光线") {
                    num = Math.floor(Math.random() * 3095) + 1000;
                    sensorData = "光线强度" + num;
                }
                const user = await ctx.model4.Account.findOne({ attributes: ['contest_uid'], where: { uid } });
                if (!user) return { code: 404 };
                const contest = await ctx.model4.Contest.findOne({ attributes: ['type'], where: { uid: user.dataValues.contest_uid, status: 0 } });
                if (!contest) return { code: 404 };
                const form = {
                    user_uid: uid,
                    contest_uid: user.dataValues.contest_uid,
                    exam_type: contest.dataValues.type,
                    topic1: randomChar,
                    topic2: randomNum,
                    topic3: bdCardMsg.join(","),
                    topic5: sensorData,
                    created_at: new Date(),
                };
                contestTopic = await ctx.model4.Examination.create(form, { silent: true });
                if (!contestTopic) return { code: 404 };
            }
            contestTopic.dataValues.topic3.match(/[^a-zA-Z]/g).join('');
            let idArr;
            if (contestTopic.dataValues.updated_at != null) {
                idArr = contestTopic.dataValues.answer.split(",");
            } else {
                idArr = answerId;
            }
            let attributes = ['id', 'card_id', 'encode_type', 'msg_data', 'created_at'],
                where = { id: idArr, user_uid: uid },
                dbOptions = { attributes, where };
            const result = await ctx.model4.TShortMsg.findAndCountAll(dbOptions);
            return { code: 200, examination: contestTopic.dataValues, shortMsg: result.rows };
        } catch (error) {
            const blockName = fileName + "--" + "topic";
            ctx.app.middleware.log('../../serviceLog', blockName + ">>>>" + error);
            return 'error';
        }
    }

    // 系统读取单选题
    async radio(radioArr) {
        const { ctx } = this;
        try {
            const Radio = await ctx.model4.ChoiceTopic.findAll({ attributes: ['id', 'topic', 'options_a', 'options_b', 'options_c', 'options_d'], where: { id: radioArr } });
            return Radio.length == 0 ? false : Radio;
        } catch (error) {
            const blockName = fileName + "--" + "radio";
            ctx.app.middleware.log('../../serviceLog', blockName + ">>>>" + error);
            return 'error';
        }
    }
}

module.exports = TopicService;