wordle-clone/assets/scripts/models/gamecontroller.js

export const GUESS_RESULT = {
  MISS: 'm',
  WIN: 'w',
  FOUL: 'f'  
};

export const MARKERS = {
    MISS: 'm',
    RIGHT_POS: 'g',
    RIGHT_CHAR: 'y'
};

export class GameController {
  constructor(wordSource) {
    this._wordSource = wordSource;
    this._currentWord = wordSource.getCurrentWord();
    this._guesses = 5;
  }
  
  wordLength() {
    return this._currentWord.length;
  }
  
  guesses() {
    return this._guesses;
  }
  
  checkGuess(guess) {
    if (guess.length != this._currentWord.length) {
      throw Error(`Expected length to be ${this._currentWord.length} but was ${guess.length}`);
    }
    
    // Check correct placements
    let guessResult;
    let markers = new Array(guess.length);
    let misses = {};
    let hits = {};
    
    if (!this._wordSource.isWord(guess)) {
      return {
        guessResult: GUESS_RESULT.FOUL,
      };
    }
    
    for (let i = 0; i < guess.length; i++) {
      if (guess[i] == this._currentWord[i]) {
        markers[i] = MARKERS.RIGHT_POS;
        hits[guess[i]] = MARKERS.RIGHT_POS;
      } else {
        if (this._currentWord[i] in misses) {
          misses[this._currentWord[i]] += 1;
        } else {
          misses[this._currentWord[i]] = 1;
        }
      }
    }
    
    // Check words that are wrong placement but are in the word
    // Distribute based on the words position
    for (let i = 0; i < guess.length; i++) {
      if (markers[i]) {
        continue;
      }
      
      if (misses[guess[i]] && misses[guess[i]] > 0) {
        misses[guess[i]] -= 1;
        markers[i] = MARKERS.RIGHT_CHAR;
        
        if (!hits[guess[i]]) {
          hits[guess[i]] = MARKERS.RIGHT_CHAR;
        }
      } else {
        if (!hits[guess[i]]) {
          hits[guess[i]] = MARKERS.MISS;
        }
        markers[i] = MARKERS.MISS;
      }
    }
    
    let isRight = markers.filter((x) => x == MARKERS.RIGHT_POS).length == this._currentWord.length;
    if (isRight) {
      guessResult = GUESS_RESULT.WIN;
    } else {
      guessResult = GUESS_RESULT.MISS;
    }
    
    return {
      guessResult: guessResult,
      hits: hits,
      markers: markers
    };
  }
}