const parseArgs = require('minimist');
const { InvalidArgumentError } = require('../../errors');

class ArgsParser {
  constructor(minimistOptions = ArgsParser.DEFAULT_OPTIONS, requiredArgs = []) {
    this.options = minimistOptions;
    this.required = requiredArgs;
  }

  parse(argv) {
    const parsedArgs = parseArgs(argv, this.options);
    this.validate(parsedArgs);

    const { _: [directory], ...rest } = parsedArgs;
    
    return {
      ...rest,
      directory
    };
  }

  validate(parsedArgs) {
    this.required.forEach((arg) => {
      if (!parsedArgs[arg]) {
        throw new InvalidArgumentError(`--${arg} is required!`);
      }
    });
  }
}

ArgsParser.DEFAULT_OPTIONS = {
  boolean: ['display'],
  default: {
    display: false
  }
};

module.exports = ArgsParser;