const path = require('path');
let shelljs = require('shelljs');
let proxy = require('../contracts/proxy');
const Ipc = require('../core/ipc');
const constants = require('../constants.json');
const {defaultHost, dockerHostSwap} = require('../utils/host');

class Simulator {
  constructor(options) {
    this.blockchainConfig = options.blockchainConfig;
    this.logger = options.logger;
  }

  run(options) {
    let cmds = [];

    const ganache = path.join(__dirname, '../../node_modules/.bin/ganache-cli');

    let useProxy = this.blockchainConfig.proxy || false;
    let host = (dockerHostSwap(options.host || this.blockchainConfig.rpcHost) || defaultHost);
    let port = (options.port || this.blockchainConfig.rpcPort || 8545);

    cmds.push("-p " + (port + (useProxy ? constants.blockchain.servicePortOnProxy : 0)));
    cmds.push("-h " + host);
    cmds.push("-a " + (options.numAccounts || 10));
    cmds.push("-e " + (options.defaultBalance || 100));
    cmds.push("-l " + (options.gasLimit || 8000000));

    // adding mnemonic only if it is defined in the blockchainConfig or options
    let simulatorMnemonic = this.blockchainConfig.simulatorMnemonic || options.simulatorMnemonic;
    if (simulatorMnemonic) {
      cmds.push("--mnemonic \"" + (simulatorMnemonic) +"\"");
    }

    // the simulatorAccounts configuration overrides a mnemonic
    let simulatorAccounts = this.blockchainConfig.simulatorAccounts || options.simulatorAccounts;
    if (simulatorAccounts && simulatorAccounts.length > 0) {
      simulatorAccounts.forEach((account, index) => {
        let hexBalance = '0x8AC7230489E80000'; // 10 ether;
        if (account.hexBalance) { // TODO: ensure it is 0x-prefixed hex
          if (account.hexBalance.match(/0x[a-f0-9]+/i)) {
            hexBalance = account.hexBalance;
          } else {
            this.logger.warn('Balance provided for the account #' + index + ' is not a valid hex number. Using 10 ether as a default.');
          }
        } else {
          this.logger.warn('No balance has been provided for the account #' + index + '. Using 10 ether as a default.');
        }
        let cmd = '--account="' + account.privateKey + ','+hexBalance + '"';
        cmds.push(cmd);
      });
    }

    // adding blocktime only if it is defined in the blockchainConfig or options
    let simulatorBlocktime = this.blockchainConfig.simulatorBlocktime || options.simulatorBlocktime;
    if (simulatorBlocktime) {
      cmds.push("-b \"" + (simulatorBlocktime) +"\"");
    }

    const programName = 'ganache-cli';
    const program = ganache;
    console.log(`running: ${programName} ${cmds.join(' ')}`);
    shelljs.exec(`${program} ${cmds.join(' ')}`, {async : true});

    if(useProxy){
      let ipcObject = new Ipc({ipcRole: 'client'});
      proxy.serve(ipcObject, host, port, false);
    }
  }
}

module.exports = Simulator;