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

// interfaces
export interface ICommandObservableObject {
  commandName: string;
  subject: plugins.smartrx.rxjs.Subject<any>;
}

const logger = new plugins.smartlog.ConsoleLog();

/**
 * class to create a new instance of Smartcli. Handles parsing of command line arguments.
 */
export class Smartcli {
  /**
   * this Deferred contains the parsed result in the end
   */
  public parseCompleted = plugins.smartpromise.defer<any>();

  public version: string;

  /**
   * map of all Trigger/Observable objects to keep track
   */
  private commandObservableMap = new plugins.lik.ObjectMap<ICommandObservableObject>();

  /**
   * maps alias
   */
  public aliasObject: { [key: string]: string[] } = {};

  /**
   * The constructor of Smartcli
   */
  constructor() {}

  /**
   * adds an alias, meaning one equals the other in terms of command execution.
   */
  public addCommandAlias(originalArg: string, aliasArg: string): void {
    this.aliasObject[originalArg] = this.aliasObject[originalArg] || [];
    this.aliasObject[originalArg].push(aliasArg);
  }

  /**
   * adds a Command by returning a Promise that reacts to the specific commandString given.
   * Note: in e.g. "npm install something" the "install" is considered the command.
   */
  public addCommand(commandNameArg: string): plugins.smartrx.rxjs.Subject<any> {
    let commandSubject: plugins.smartrx.rxjs.Subject<any>;
    const existingCommandSubject = this.getCommandSubject(commandNameArg);
    commandSubject = existingCommandSubject || new plugins.smartrx.rxjs.Subject<any>();

    this.commandObservableMap.add({
      commandName: commandNameArg,
      subject: commandSubject,
    });
    return commandSubject;
  }

  /**
   * execute trigger by name
   * @param commandNameArg - the name of the command to trigger
   */
  public triggerCommand(commandNameArg: string, argvObject: any) {
    const triggerSubject = this.getCommandSubject(commandNameArg);
    triggerSubject.next(argvObject);
    return triggerSubject;
  }

  /**
   * gets the command subject for the specified name.
   * call this before calling .parse()
   * @param commandNameArg 
   * @returns 
   */
  public getCommandSubject(commandNameArg: string) {
    const triggerObservableObject = this.commandObservableMap.findSync(
      (triggerObservableObjectArg) => {
        return triggerObservableObjectArg.commandName === commandNameArg;
      }
    );
    if (triggerObservableObject) {
      return triggerObservableObject.subject;
    } else {
      return null;
    }
  }

  /**
   * getOption
   */
  public getOption(optionNameArg: string) {
    const parsedYargs = plugins.yargsParser(process.argv);
    return parsedYargs[optionNameArg];
  }

  /**
   * allows to specify help text to be printed above the rest of the help text
   */
  public addHelp(optionsArg: { helpText: string }) {
    this.addCommand('help').subscribe((argvArg) => {
      logger.log('info', optionsArg.helpText);
    });
  }

  /**
   * specify version to be printed for -v --version
   */
  public addVersion(versionArg: string) {
    this.version = versionArg;
  }

  /**
   * adds a trigger that is called when no command is specified
   */
  public standardCommand(): plugins.smartrx.rxjs.Subject<any> {
    const standardSubject = this.addCommand('standardCommand');
    return standardSubject;
  }

  /**
   * start the process of evaluating commands
   */
  public startParse(): void {
    const parsedYArgs = plugins.yargsParser(process.argv);

    // lets handle commands
    let counter = 0;
    let foundCommand = false;
    parsedYArgs._ = parsedYArgs._.filter((commandPartArg) => {
      counter++;
      if (typeof commandPartArg === 'number') {
        return true;
      }
      if (counter <= 2 && !foundCommand) {
        const isPath = commandPartArg.startsWith('/');
        foundCommand = !isPath;
        return foundCommand;
      } else {
        return true;
      }
    });
    const wantedCommand = parsedYArgs._[0];

    // lets handle some standards
    if (!wantedCommand && (parsedYArgs.v || parsedYArgs.version)) {
      console.log(this.version || 'unknown version');
      return;
    }
    console.log(`Wanted command: ${wantedCommand}`);
    for (const command of this.commandObservableMap.getArray()) {
      if (!wantedCommand) {
        const standardCommand = this.commandObservableMap.findSync((commandArg) => {
          return commandArg.commandName === 'standardCommand';
        });
        if (standardCommand) {
          standardCommand.subject.next(parsedYArgs);
        } else {
          console.log('no smartcli standard task was created or assigned.');
        }
        break;
      }
      if (command.commandName === parsedYArgs._[0]) {
        command.subject.next(parsedYArgs);
        break;
      }
      if (this.aliasObject[parsedYArgs[0]]) {
      }
    }
    this.parseCompleted.resolve(parsedYArgs);
    return;
  }
}