// The javascript for this game is heavily based on the Simon Says project by Kelly King which can be found on GitHub, adapted to work within my HTML structure for the game (https://github.com/kellyk/javascript-simon)

// Globals to minimize magic numbers
var GAME_LOST = -1;
var GAME_WON = 1;

var YEL_BTN = 1;
var BLU_BTN = 2;
var GRN_BTN = 3;
var RED_BTN = 4;

// The audio elements for each button, will be bound on DOM load
var YEL_BTNSOUND, BLU_BTNSOUND, GRN_BTNSOUND, RED_BTNSOUND;

// global strict mode
var strictMode = false;

// define a Simon object, that will represent the game
var Simon = {
  sequence: [],
  sequence_copy: [],
  steps: 0,
  active: true,
  
  // Initialize a new game state, and start the game
  startGame: function() {
    this.sequence = [];
    this.sequence_copy = [];
    this.steps = 0;
    this.active = true;
    this.nextRound(true);
  },
  
  // Resets member variables to their initial values
  reset: function() {
    this.sequence = [];
    this.sequence_copy = [];
    this.steps = 0;
    this.active = true;
    strictMode = false;
    
    // Reset the css of the screen and led
    $(".strict-led").toggleClass("strict-led-enabled", strictMode);
    $(".digital-screen").attr("value", "");
  },
  
  // Runs a round of the game, by adding a new
  // button to the sequence, updating the steps counter,
  // and animating the new sequence
  // The addToSequence boolean value enables non-strict mode
  nextRound: function(addToSequence) {
    if (addToSequence) {
      this.sequence.push(this.getRandomButton());
      this.steps++;
      $(".digital-screen").attr("value", this.steps.toString());
    }
    this.sequence_copy = this.sequence.slice(0);
    this.animateSequence();
  },
  
  // Checks whether the player has won, lost, 
  // or if the game needs to continue 
  updateState: function() {
    // If the sequence_copy is empty, the user input the correct click
    // and it is round 20, the game is over and the player won
    // If it's not round 20, the game continues
    if (this.sequence_copy.length === 0 && this.active) {
      if (this.steps >= 20) {
        this.endGame(GAME_WON);
      }
      else {
        this.deactivateBoard();
        this.nextRound(true);
      }
    }
    // If the player clicked the wrong button, we replay the round
    // unless strictMode is enabled, in which case the player loses
    else if (!this.active && strictMode) {
      this.endGame(GAME_LOST);
    }
    else if(!this.active) {
      this.deactivateBoard();
      this.nextRound(false);
    }
  },
  
  endGame: function(winOrLose) {
    if (winOrLose === GAME_WON) {
      $(".win-lose-text").text("Congratulations, you won!")
        .fadeIn("fast").fadeOut(3200);
    }
    else {
      $(".win-lose-text").text("Oh no, you lost!")
        .fadeIn("fast").fadeOut(3200);
    }
    this.reset();
  },
  
  // Returns a random number from 1 to 4, 
  // representing a game button
  getRandomButton: function() {
    return Math.floor(Math.random() * 4 + 1);
  },
  
  // Animates the current sequence of buttons
  // Reactivates interactivity with the board
  // once it has completed the animation
  animateSequence: function() {
    var i = 0;
    var localThis = this;
    var interval = setInterval(function() {
      localThis.playSound(localThis.sequence[i]);
      localThis.lightButton(localThis.sequence[i]);
      
      i++;
      if (i >= localThis.sequence.length) {
        clearInterval(interval);
        localThis.activateBoard();
      }
    }, 800);
  },
  
  // Plays the designated sound for the button at buttonIdx
  // 1-4 map to buttons, any other number will play the error sound
  playSound: function(btnIdx) {
    switch (btnIdx) {
      case YEL_BTN:
        YEL_BTNSOUND.play();
        break;
      case BLU_BTN:
        BLU_BTNSOUND.play();
        break;
      case GRN_BTN:
        GRN_BTNSOUND.play();
        break;
      case RED_BTN:
        RED_BTNSOUND.play();
        break;
      default:
        break;
    }
  },
  
  // "Lights" up the button at the specified index by changing its color
  lightButton: function(btnIdx) {
      switch (btnIdx) {
        case YEL_BTN:
          $("#button-tl").css("background-color", "yellow");
          window.setTimeout(function() {
            $("#button-tl").css("background-color", "#FFD026"); 
          }, 400);
          break;
        case BLU_BTN:
          $("#button-tr").css("background-color", "blue");
          window.setTimeout(function() {
            $("#button-tr").css("background-color", "#2659A9"); 
          }, 400);
          break;
        case GRN_BTN:
          $("#button-br").css("background-color", "green");
          window.setTimeout(function() {
            $("#button-br").css("background-color", "#26B644"); 
          }, 400);
          break;
        case RED_BTN:
          $("#button-bl").css("background-color", "red");
          window.setTimeout(function() {
            $("#button-bl").css("background-color", "#D62626"); 
          }, 400);
          break;
        default:
          break;
    }
  },
  
  // Function for enabling and disabling user input
  activateBoard: function() {
    $(".game-btn").click(checkClick);
    $(".button-small").prop("disabled", false);
  },
  deactivateBoard: function() {
    $(".game-btn").off("click");
    $(".button-small").prop("disabled", true);
  },
  
  // Toggles strictMode on and off, 
  // as well as changing the css of the strict-led
  changeMode: function() {
    strictMode = !strictMode;
    $(".strict-led").toggleClass("strict-led-enabled", strictMode);
  }
};

// Checks whether the click matched the next one in the sequence
function checkClick() {
  var buttonClicked = parseInt($(this).prop("value"));
  var desiredClicked = Simon.sequence_copy.shift();
  
  // Play sound/light the button we clicked regardless of whether it is correct
  Simon.playSound(buttonClicked);
  Simon.lightButton(buttonClicked);
  
  Simon.active = (desiredClicked === buttonClicked);
  Simon.updateState();
}

// Bind the necessary buttons to their respective functions
$(document).ready(function() {
  // Bind the audio elements
  YEL_BTNSOUND = document.getElementById("audio-button-tl");
  BLU_BTNSOUND = document.getElementById("audio-button-tr");
  GRN_BTNSOUND = document.getElementById("audio-button-br");
  RED_BTNSOUND = document.getElementById("audio-button-bl");
  
  $("#button-start").click(function() {
    Simon.startGame();
  });
  $("#button-strict").click(Simon.changeMode);
  $("#button-reset").click(Simon.reset);
});