import '../provider/data.dart';
import '../utils/random_pick_word.dart';

class GameUtils {
  static Future<void> quitGame(Data myProvider) async {
    myProvider.updateGameIsRunning(false);
  }

  static Future<void> startGame(Data myProvider) async {
    print('Starting game (' +
        myProvider.lang +
        ' / ' +
        myProvider.length +
        ' / ' +
        myProvider.level +
        ' )');

    myProvider.resetGame();

    await pickWord(myProvider);

    myProvider.updateGameIsRunning(true);
  }

  static Future<void> pickWord(Data myProvider) async {
    RandomPickWord randomPickWord;
    String word = '';

    int attempts = 0;
    do {
      randomPickWord = RandomPickWord();
      int wordLength = int.parse(myProvider.length);
      await randomPickWord.init(myProvider.lang, wordLength, myProvider.level);

      if (randomPickWord.word != '') {
        word = randomPickWord.word;
      }
      attempts++;

      if ((word != '') && !myProvider.isRecentlyPicked(word)) {
        myProvider.updateWord(word);
      }
    } while (myProvider.word != word && attempts < 10);

    print('Picked word: ' + word);
  }

  static void addLetter(Data myProvider, String letter) {
    myProvider.currentGuessAddLetter(letter);
  }

  static void removeLetter(Data myProvider) {
    myProvider.currentGuessRemoveLetter();
  }

  static List<String> getTips(Data myProvider, String candidate) {
    String word = myProvider.word;
    int wordLength = int.parse(myProvider.length);

    List<String> tips = List<String>.filled(wordLength, '', growable: false);

    if ((word.length != wordLength) ||
        (candidate.length != wordLength) ||
        (!RandomPickWord.checkWordExists(candidate))) {
      return List<String>.filled(wordLength, 'wrong', growable: false);
    }

    String replaceCharAt(String oldString, int index, String newChar) {
      return oldString.substring(0, index) + newChar + oldString.substring(index + 1);
    }

    // Check correctly placed letters
    for (int i = 0; i < wordLength; i++) {
      if ((tips[i] == '') && (word[i] == candidate[i])) {
        myProvider.addFoundLetter(word[i], i);
        word = replaceCharAt(word, i, ' ');
        candidate = replaceCharAt(candidate, i, ' ');
        tips[i] = 'good';
      }
    }

    // Check misplaced letters
    for (int i = 0; i < wordLength; i++) {
      for (int j = 0; j < wordLength; j++) {
        if ((candidate[j] != ' ') && (candidate[j] == word[i])) {
          word = replaceCharAt(word, i, ' ');
          candidate = replaceCharAt(candidate, j, ' ');
          tips[j] = 'misplaced';
        }
      }
    }

    return tips;
  }

  static void submitWord(Data myProvider) {
    if (GameUtils.checkCurrentlyGuessedWordExists(myProvider)) {
      print('Ok word allowed: "' + myProvider.currentGuess + '".');
      myProvider.currentGuessSubmitWord();
    } else {
      print('Unknown word: "' + myProvider.currentGuess + '".');
      myProvider.currentGuessSubmitWrongWord();
    }
  }

  static bool checkCurrentlyGuessedWordExists(Data myProvider) {
    return RandomPickWord.checkWordExists(myProvider.currentGuess);
  }
}