const utils = require("./utils");
const log = require("./log");
const db = require("./db");
const dbhelper = require("./dbhelper");
const bchelper = require("./bchelper");
const present = require("./present");

class PresentMgr {

  constructor() {
    this.lastIdx = 0;
  }

  init() {
    setTimeout(this.start.bind(this), 1000 * 3);
  }

  async start() {
    let maxIdx = 0;
    while (true) {
      {
        const {err, rows} = await db.execQuery(
          'SELECT * FROM t_present WHERE `idx` > ? AND `ignore` = 0 AND ' +
          'done = 0 AND suspend = 0 LIMIT 100',
          [this.lastIdx]);
        if (!err) {
          for (let i in rows) {
            const row = rows[i];
            const obj = new present.Present(row);
            await obj.start();
            if (row['idx'] > this.lastIdx) {
              this.lastIdx = row['idx'];
            }
            await utils.sleep(500 + utils.randRange(500, 1000));
          }
          if (this.lastIdx < maxIdx + 99) {
            this.lastIdx = maxIdx;
          }
        }
      }
      {
        const {err, row} = await db.execQueryOne(
          'SELECT max(idx) max_idx FROM t_present', []);
        if (!err) {
          maxIdx = row['max_idx'];
        }
      }
      await utils.sleep(1500 + utils.randRange(500, 1500));
    }
  }

}

module.exports = new PresentMgr();