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

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

class ProgressionState {
  getProgression() {
    let prog = localStorage.getItem('progression');
    if (prog) {
      return JSON.parse(prog);
    }

    prog = {wordLength: 4, wordIndex: {"4": 0, "5": 0, "6": 0}};
    localStorage.setItem('progression', JSON.stringify(prog));
    return prog;
  }

  saveProgression(prog) {
    localStorage.setItem('progression', JSON.stringify(prog));
  }
}

export class GameController {
  constructor(wordSource) {
    this._wordSource = wordSource;
    this._progressionState = new ProgressionState();
  }

  async start() {
    let prog = this._progressionState.getProgression();

    this._currentWord = await this._wordSource.getCurrentWord(prog);
    this._guesses = Math.max(this._currentWord.length, 5) + 1;

    console.log("The current word: " + this._currentWord);
  }
  
  wordLength() {
    this._checkHasStarted();
    return this._currentWord.length;
  }
  
  guesses() {
    this._checkHasStarted();
    return this._guesses;
  }

  currentWord() {
    this._checkHasStarted();
    return this._currentWord;
  }
  
  async nextWord() {
    // Increment the progress
    let prog = this._progressionState.getProgression();
    prog.wordIndex[prog.wordLength + ""] += 1;
    prog.wordLength = (((Math.random() * 23) | 0) / 10 | 0) + 4;

    this._progressionState.saveProgression(prog);

    this._currentWord = await this._wordSource.getCurrentWord(prog);
    this._guesses = Math.max(this._currentWord.length, 5) + 1;
    return true;
  }
  
  checkGuess(guess) {
    this._checkHasStarted();

    guess = guess.toLowerCase();

    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._currentWord.length <= 5) {
      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
    };
  }

  _checkHasStarted() {
    if (!this._currentWord) {
      throw new Error("call start() first");
    }
  }
}