const child_process = require('child_process');
const ProcessWrapper = require('../../process/processWrapper');
const constants = require('../../constants');

let swarmProcess;

class SwarmProcess extends ProcessWrapper {
  constructor(options) {
    super();
    this.storageConfig = options.storageConfig;
    this.webServerConfig = options.webServerConfig;
  }

  startSwarmDaemon() {
    const self = this;
    if (!this.storageConfig.account || !this.storageConfig.account.address || !this.storageConfig.account.password) {
      return 'Account address and password are needed in the storage config to start the Swarm process';
    }
    let corsDomain = 'http://localhost:8000';
    if (self.webServerConfig && self.webServerConfig && self.webServerConfig.host  && self.webServerConfig.port) {
      corsDomain = `http://${self.webServerConfig.host}:${self.webServerConfig.port}`;
    }
    const child = child_process.spawn(this.storageConfig.swarmPath || 'swarm',
      [
        `--bzzaccount ${this.storageConfig.account.address}`,
        `--password ${this.storageConfig.account.password}`,
        `--corsdomain ${corsDomain}`,
        "--ens-api ''"
      ]);
    let lastMessage;
    child.stderr.on('data', (data) => {
      if (!self.readyCalled && data.indexOf('Swarm http proxy started') > -1) {
        self.readyCalled = true;
        self.send({result: constants.storage.initiated});
      }
      lastMessage = data;
      console.log('Swarm: ' + data);
    });
    child.on('exit', (code) => {
      if (code) {
        console.error('Swarm exited with error code ' + code);
        console.error(lastMessage);
      }
    });
  }
}

process.on('message', (msg) => {
  if (msg.action === constants.storage.init) {
    swarmProcess = new SwarmProcess(msg.options);
    const error = swarmProcess.startSwarmDaemon();

    if (error) {
      swarmProcess.send({result: constants.storage.initiated, error});
    }
  }
});