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

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

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

    this.clearProgression("");
    return prog;
  }

  clearProgression(shuffleId) {
    let prog = {
      shuffleId: shuffleId,
      wordLength: 4,
      wordIndex: {"4": 0, "5": 0, "6": 0, "7": 0},
      currentGuesses: []
    };
    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();

    if (await this._wordSource.needToResetProgression(prog)) {
      console.log("Clearing patten shuffle id")
      prog = this._progressionState.clearProgression(await this._wordSource.getPattenShuffleID());
    }

    this._currentWord = await this._wordSource.getCurrentWord(prog);
    this._guesses = 6;

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

  currentState() {
    let prog = this._progressionState.getProgression();
    if (!prog || !prog.currentGuesses) {
      return [];
    }
    return {
      wasWin: prog.wasWin,
      currentGuesses: prog.currentGuesses
    };
  }

  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;
    prog.wordLength = ((Math.random() * 4) | 0) + 4;

    prog.currentGuesses = [];
    prog.wasWin = false;
    this._progressionState.saveProgression(prog);

    this._currentWord = await this._wordSource.getCurrentWord(prog);
    //this._guesses = Math.max(this._currentWord.length, 5) + 1;
    this._guesses = 6;
    return true;
  }

  showHint() {
    let hints = new Array(this._currentWord.length);
    let priorGuesses = this._progressionState.getProgression().currentGuesses;

    hints[0] = this._currentWord[0];
    for (let i = 1; i < this._currentWord.length; i++) {
      for (let guess of priorGuesses) {
        if (guess[i] === this._currentWord[i]) {
          hints[i] = this._currentWord[i];
        }
      }
    }

    return hints;
  }

  submitGuess(guess) {
    guess = guess.toLowerCase();

    let results = this.checkGuess(guess);

    // Add this guess to the progression state
    if (results.guessResult !== GUESS_RESULT.FOUL) {
      let prog = this._progressionState.getProgression();
      prog.currentGuesses.push(guess);
      prog.wasWin = results.guessResult === GUESS_RESULT.WIN;
      this._progressionState.saveProgression(prog);
    }

    return results;
  }

  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 = {};

    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");
    }
  }
}