import * as plugins from './plugins.js';
import * as paths from './paths.js';

/**
 * Smartconfig class allows easy configuration of tools
 */
export class Smartconfig {
  cwd: string;
  lookupPath: string;
  smartconfigJsonExists: boolean;
  smartconfigJsonData: any;

  /**
   * creates instance of Smartconfig
   */
  constructor(cwdArg?: string) {
    if (cwdArg) {
      this.cwd = cwdArg;
    } else {
      this.cwd = paths.cwd;
    }
    this.checkLookupPath();
    this.checkSmartconfigJsonExists();
    this.checkSmartconfigJsonData();
  }

  /**
   * merges the supplied options with the ones from smartconfig.json
   */
  dataFor<IToolConfig>(
    toolnameArg: string,
    defaultOptionsArg: any,
  ): IToolConfig {
    let smartconfigToolOptions;
    if (this.smartconfigJsonData[toolnameArg]) {
      smartconfigToolOptions = this.smartconfigJsonData[toolnameArg];
    } else {
      smartconfigToolOptions = {};
    }
    let mergedOptions = {
      ...defaultOptionsArg,
      ...smartconfigToolOptions,
    };
    return mergedOptions;
  }

  /**
   * checks if the JSON exists
   */
  private checkSmartconfigJsonExists() {
    this.smartconfigJsonExists = plugins.smartfile.fs.fileExistsSync(
      this.lookupPath,
    );
  }

  /**
   * gets lookupPath
   */
  private checkLookupPath() {
    if (this.cwd) {
      this.lookupPath = plugins.path.join(this.cwd, '.smartconfig.json');
    } else {
      this.lookupPath = paths.configFile;
    }
  }

  /**
   * get smartconfigJsonData
   */
  private checkSmartconfigJsonData() {
    if (this.smartconfigJsonExists) {
      this.smartconfigJsonData = plugins.smartfile.fs.toObjectSync(
        this.lookupPath,
      );
    } else {
      this.smartconfigJsonData = {};
    }
  }
}