const Chain = require("../../model/chain");

module.exports = class ChainLib {
  static getCommandChainId() {
    const input = process.argv[process.argv.length - 1]
    const [paraName, value] = input.split('=')

    if (paraName !== 'chainId') {
      throw Error('command paras must have: chainId. like: chainId=1.')
    }

    return parseInt(value)
  }

  static async parseChainById(chainId) {
    const chainRst = await Chain.findById(chainId)
    if (!chainRst.state) {
      throw Error(chainRst.msg)
    }

    return chainRst.data
  }

  static async getChainFromCommand() {
    return await ChainLib.parseChainById(ChainLib.getCommandChainId())
  }
}