const fs = require('../../core/fs.js');
const utils = require('../../utils/utils.js');

class ENS {
  constructor(embark, options) {
    this.logger = embark.logger;
    this.events = embark.events;
    this.web3 = options.web3;
    this.embark = embark;

    this.addENSToEmbarkJS();
    this.addSetProvider();
	}

  addENSToEmbarkJS() {
    const self = this;
    // TODO: make this a shouldAdd condition
    if (this.namesConfig === {}) {
      return;
    }

    if ((this.namesConfig.available_providers.indexOf('ens') < 0) && (this.namesConfig.provider !== 'ens' || this.namesConfig.enabled !== true)) {
      return;
    }

    self.events.request("version:get:eth-ens-namehash", function(namehashVersion) {
      let currentEnsNamehashVersion = require('../../../package.json').dependencies["eth-ens-namehash"];
      if (EnsNamehashVersion !== currentEnsNamehashVersion) {
        self.events.request("version:getPackageLocation", "eth-ens-namehash", EnsNamehashVersion, function(err, location) {
          self.embark.registerImportFile("eth-ens-namehash", fs.dappPath(location));
        });
      }
    });

    let code = "";
    code += "\n" + fs.readFileSync(utils.joinPath(__dirname, 'embarkjs.js')).toString();
    code += "\nEmbarkJS.Names.registerProvider('ens', __embarkENS);";

    this.embark.addCodeToEmbarkJS(code);
  }

  addSetProvider() {
    let config = JSON.stringify({
      server: this.storageConfig.host,
      port: this.storageConfig.port
    });

    let code = "\nEmbarkJS.Names.setProvider('ens'," + config + ");";

    let shouldInit = (storageConfig) => {
      return (namesConfig.provider === 'ens' && storageConfig.enabled === true);
    };

    this.embark.addProviderInit('names', code, shouldInit);
  }
}

module.exports = ENS;