const logger = require("../../utils/logger");

module.exports = class StateLib {
  async handlePosition(routerObj) {
    const block = routerObj.type === 'univ2' ? 'UNIV2DEX' : 'UNIV3DEX'
    const hash = routerObj.type === 'univ2' ? routerObj.factory : routerObj.router + '_router'

    try {
      // 拉取当前pull状态信息
      const pullState = await History.findByHashOrBlockOrDataVague(block, hash, '', 0, 200)
      let nowPosition = 0

      // 没有状态信息的情况
      if (pullState.data.length === 0) {
        await History.appendOrUpdate(block, hash, {"next": 0})
      } else {
        nowPosition = pullState.data[0].dataObj.next
      }

      return nowPosition
    } catch (e) {
      logger.error(`Pull state error, router: ${routerObj.router}, factory: ${routerObj.factory}`)
      logger.error(e)
    }

    return 0
  }
}