'use strict';

const assert = require('assert');
const Service = require('egg').Service;
class PaperService extends Service {
  constructor(ctx) {
    super(ctx);
    this.model = this.ctx.model.Paper;
    this.bankModel = this.ctx.model.Bank;
  }
  async create({ userName, userId, list }) {
    assert(userName, '用户名不存在');
    assert(userId, '用户ID不存在');
    assert(list, '内容不存在');
    try {
      let fraction = 0;
      for (let i = 0; i < list.length; i++) {
        const data = await this.bankModel.findById({ _id: list[i]._id });
        if (data.answer === list[i].answer) {
          fraction += data.fraction;
        }
      }
      await this.model.create({ userName, userId, list, fraction });
      return { errcode: 0, errmsg: 'ok', data: { fraction } };
    } catch (error) {
      throw error;
    }
  }
  async update({ id, userName, userId, list, fraction }) {
    assert(id, 'id不存在');
    try {
      await this.model.updateOne({ _id: id }, { userName, userId, list, fraction });
      return { errcode: 0, errmsg: 'ok', data: '' };
    } catch (error) {
      throw error;
    }
  }
  async delete({ id }) {
    assert(id, 'id不存在');
    try {
      await this.model.deleteOne({ _id: id });
      return { errcode: 0, errmsg: 'ok', data: '' };
    } catch (error) {
      throw error;
    }
  }
  async query({ skip, limit, userName, fraction }) {
    const filter = {};
    const arr = { userName, fraction };
    for (const e in arr) {
      const data = `{ "${e}": { "$regex": "${arr[e]}" } }`;
      if (arr[e]) {
        filter.$or = [];
        filter.$or.push(JSON.parse(data));
      }
    }
    try {
      const total = await this.model.find({ ...filter });
      let res;
      if (skip && limit) {
        res = await this.model.find({ ...filter }).skip(Number(skip) * Number(limit)).limit(Number(limit));
      } else {
        res = await this.model.find({ ...filter });
      }
      return { errcode: 0, errmsg: 'ok', data: res, total: total.length };
    } catch (error) {
      throw error;
    }
  }
  async setTopic({ isRandom, total }) {
    try {
      let data;
      const list = [];
      if (!isRandom) {
        // 不随机
        data = await this.bankModel.find({}, { answer: false }).skip(0).limit(Number(total));
      } else {
        // 随机
        const totals = await this.bankModel.find();
        const arr = [];
        for (let i = 0; i < total; i++) {
          const num = Math.floor(Math.random() * totals.length);
          if (!arr.includes(num)) {
            arr.push(num);
            const res = await this.bankModel.find({}, { answer: false }).skip(Number(num)).limit(1);
            list.push(...res);
          }
        }
      }
      return { errcode: 0, errmsg: 'ok', data: !isRandom ? data : list, total };
    } catch (error) {
      throw error;
    }
  }
}

module.exports = PaperService;