'use strict';

  const MAX_HISTORY = 1000;

  const redis = require('redis');

  
  const config = require('komodo-sdk/config');

  const logger = require('komodo-sdk/logger');

  const redisClient = redis.createClient(config.redis || { host: '127.0.0.1' });

  const REDIS_KEYWORD = `SHAKIR_SMS_HISTORY_${config.name||'SMS'}`;

  function push(item) {

      redisClient.LPUSH(REDIS_KEYWORD, JSON.stringify(item), () => {
          redisClient.LTRIM(REDIS_KEYWORD, 0, MAX_HISTORY);
      });

  }
  
  function dump() {

      return new Promise((resolve) => {
          const result = [];
  
          redisClient.LRANGE(REDIS_KEYWORD, 0, -1, (err, reply) => {
              reply.forEach((el) => {
                  try {
                      result.push(JSON.parse(el));
                  } catch (e) {
                      logger.warn(`Error parsing JSON on redis history. ${e.toString()}`);
                  }            
              });
              logger.info(`History fetched from redis with ${reply.length} items.`);
  
              resolve(result);
          });
      
      })

  }
  
  exports.push = push;
  exports.dump = dump;