/**
 * Mind-controlled Lunar/Apian Lander!
 * This can be controlled by the keyboard. Next steps is to build the EEG sensors... watch this space!
 * 
 * Uses collision detection by Ricardo Sanchez, from the book Mathematics and Physics for Programers by D. Kodicek
 * 
 */

PVector startPoint, endPoint;
float gravity;
boolean isMouseDragged, isMouseStageEnabled;
Landscape landscape;
Lander lander;
Boolean bGameOver = false;
Boolean bGameChoice = false;
int iGameSkin = 2;
PImage piLander1, piLander2;
ImageButton btn1, btn2;

void setup() {
  size(800, 600);
  smooth();
  background(0);
  noLoop();

  gravity = 0.01;
  isMouseDragged = false;        // to control draw temp wall during creation
  isMouseStageEnabled = true;    // to control if the canvas can recive mouse events

  piLander1 = loadImage("images/lander"+1+".png");
  piLander2 = loadImage("images/lander"+2+".png");

  ShowChoiceScreen();
}

void ShowChoiceScreen(){
  bGameChoice = true;
  background(0);

  btn1 = new GameSkinButton("images/button"+1+".jpg", "images/button"+1+"-over.jpg", "images/button"+1+".jpg", 300, 250, 1);
  btn2 = new GameSkinButton("images/button"+2+".jpg", "images/button"+2+"-over.jpg", "images/button"+2+".jpg", 600, 250, 2);
  btn1.x = width/2 - btn1.currentimage.width - 10;
  btn2.x = width/2 + 10;

  PFont endFont = createFont("Arial", 32);
  textFont(endFont); 
  textAlign(CENTER);
  text("CHOOSE YOUR STYLE!" , width/2, 64);
  endFont = createFont("Arial", 14);
  textFont(endFont); 
  text("Mind Controls: Think UP to fly, RELAX to land." , width/2, 450);
  text("Goal: Land on the pad/flower in the centre of the screen, avoiding everything else." , width/2, 470);
  text("Keyboard Controls: Just press any key to fly, release to land." , width/2, 490);
  text("Tip: Don't land too hard!" , width/2, 510);
  
  loop();
}

void StartGame(int skin){
  iGameSkin = skin;
  bGameOver = false;
  bGameChoice = false;
  landscape = new Landscape();
  lander = new Lander();
  loop();
}

void StopGame(boolean bWon, String sMessage){
  bGameOver = true;
  noLoop();

  PFont endFont = createFont("Arial", 32);
  textFont(endFont); 
  textAlign(CENTER);
  text(sMessage, width/2, 32);
  text("PRESS ENTER TO PLAY AGAIN" , width/2, 64);
}

void draw() {
  //background(0);
  noStroke();

  if(bGameChoice){
    btn1.draw();
    btn2.draw();
  } 
  else {
    // the background landscape and landing structures
    landscape.draw();

    if(bGameOver){
    } 
    else {
      lander.draw();

      // draw a grey line to show the placement of the about-to-be-creaetd wall
      if (isMouseDragged && startPoint != null) {
        stroke(200);
        line(startPoint.x, startPoint.y, mouseX, mouseY);
        fill(180);
        ellipse(startPoint.x, startPoint.y, 8, 8);
        fill(180);
        ellipse(mouseX, mouseY, 8, 8);
      }

      // note this will be replaced by the BCI input
      if (keyPressed) {
        // thrust
        lander.thrust();
      }
    }
  }
}

void keyPressed(){
  if(bGameChoice){
    if (key == '1' || key == '2' ) {
      println(key);
      iGameSkin = key - '0';
      StartGame(iGameSkin);
    }
  }
  if(bGameOver){
    if (( keyCode == ENTER || keyCode == RETURN ) ) {
      ShowChoiceScreen();
    }
  }
}
/*
// sets wall starting point on mouse press
 // mouse events can be local to the circle button class,
 // I will look in to that, to see if is possible
 void mousePressed() {
 for (int n = 0; n < landscape.walls.size(); n++) {
 Wall w = (Wall)landscape.walls.get(n);
 if (w.startPointButton.press() || w.endPointButton.press()) isMouseStageEnabled = false;
 }
 
 if (isMouseStageEnabled == true) {
 isMouseDragged = true;
 // sets start point of a the new wall
 startPoint = new PVector(mouseX, mouseY);
 }
 }
 
 // update tempWall endpoint
 void mouseDragged() {
 // check is click event is on the stage or any wall start/end points
 if (!isMouseStageEnabled) {
 for (int n = 0; n < landscape.walls.size(); n++) {
 Wall w = (Wall)landscape.walls.get(n);
 if (w.startPointButton.press()) {
 w.setStartPoint(new PVector(mouseX, mouseY));
 w.startPointButton.x = mouseX;
 w.startPointButton.y = mouseY;
 }
 if (w.endPointButton.press()) {
 w.setEndPoint(new PVector(mouseX, mouseY));
 w.endPointButton.x = mouseX;
 w.endPointButton.y = mouseY;
 }
 }
 }
 }
 
 // sets endpoints on mouse release, and create a wall
 void mouseReleased() {
 for (int n = 0; n < landscape.walls.size(); n++) {
 Wall w = (Wall)landscape.walls.get(n);
 w.startPointButton.release();
 w.endPointButton.release();
 }
 if (isMouseStageEnabled == true) {
 isMouseDragged = false;
 // sets end point of the new wall
 endPoint = new PVector(mouseX, mouseY);
 landscape.createWall(startPoint, endPoint, true);
 }
 
 isMouseStageEnabled = true;
 }
 */