'use strict';

const BaseService = require('../core/base_service.js');

const fileName = "teaching";

class TeachingService extends BaseService {
  // 获取最近发送的一条信息
  async getMsg(redis, token) {
    const { ctx } = this;
    try {
      const verifyResult = await this.Verify(redis, token);
      let result = { code: verifyResult };
      if (verifyResult == 401) {
        const where = { token };
        const attributes = ['token'];
        const dbResult = await ctx.model.BuserToken.findOne({ attributes, where });
        result.code = dbResult ? dbResult.dataValus.user_uid : 401;
      }
      if (result.code !== 401 && result.code !== 403) {
        const uidLastCode = this.shunt(result.code);
        const model = {
            "B": ctx.model.BShortMsg,
            "C": ctx.model2.CShortMsg
        };
        const attributes = ['card_id', 'encode_type', 'msg_data', 'created_at'];
        const where = { user_uid: result.code };
        const limit = 1;
        const order = [['created_at', 'DESC']];
        const dbOptions = { attributes, limit, order, where };
        const dbResult = await model[uidLastCode].findOne(dbOptions);
        if (dbResult) {
          result.userData = dbResult.dataValues;
          result.code = 200;
        } else {
          result.code = false;
        }
      }
      return result.code ? result : false;
    } catch (error) {
      const blockName = fileName + "--" + "getMsg";
      ctx.app.middleware.log('../../serviceLog', blockName + ">>>>" + error);
      return 'error';
    }
  }

  // 获取若干条历史消息
  async getHistory(redis, token, limit, offset) {
    const { ctx } = this;
    try {
      const verifyResult = await this.Verify(redis, token);
      let result = { code: verifyResult };
      if (verifyResult == 401) {
        const where = { token };
        const attributes = ['token'];
        const dbResult = await ctx.model.BuserToken.findOne({ attributes, where });
        result.code = dbResult ? dbResult.dataValus.user_uid : 401;
      }
      if (result.code !== 401 && result.code !== 403) {
        const uidLastCode = this.shunt(result.code);
        const model = {
            "B": ctx.model.BShortMsg,
            "C": ctx.model2.CShortMsg
        };
        const attributes = ['card_id', 'encode_type', 'msg_data', 'created_at'];
        const where = { user_uid: result.code };
        const order = [['created_at', 'DESC']];
        if (limit == undefined || !this.isAllDigits(limit)) {
          limit = 10
        } else {
          limit = parseInt(limit);
        }
        if (offset == undefined || !this.isAllDigits(offset)) {
          offset = 1
        } else {
          offset = parseInt(offset);
        }
        offset = (offset - 1) * limit;
        const dbOptions = { attributes, limit, offset, order, where };
        const dbResult = await model[uidLastCode].findAndCountAll(dbOptions);
        if (dbResult.rows.length !== 0) {
          result.userData = {
            rows: dbResult.rows,
            count: dbResult.count
          };
          result.code = 200;
        } else {
          result.code = false;
        }
      }
      return result.code ? result : false;
    } catch (error) {
      const blockName = fileName + "--" + "getHistory";
      ctx.app.middleware.log('../../serviceLog', blockName + ">>>>" + error);
      return 'error';
    }
  }
}

module.exports = TeachingService;