PImage backgroundImage;
PImage playerImage;
PImage tanniImage;
float tanniY;
float tanniX;
int score;
int state;

void setup() {
  size(1280, 720, P2D);
  backgroundImage = loadImage("school.jpg");
  backgroundImage.resize(width, height);
  playerImage = loadImage("chimpanzee.png");
  playerImage.resize(200, 200);
  tanniImage = loadImage("tanni.png");
  tanniImage.resize(100, 100);
  imageMode(CENTER);
  tanniY = -50;
  tanniX = random(50, width - 50);
  fill(0);
  score = 0;
  state = 0;
}

void draw() {
  background(backgroundImage);
  switch(state) {
    case 0:
      titleScene();
      break;
    case 1:
      gameScene();
      break;
    case 2:
      resultScene();
      break;
  }
}

void resetTanni() {
  tanniY = -50;
  tanniX = random(50, width - 50);
}

void titleScene() {
  textSize(70);
  textAlign(CENTER, CENTER);
  text("Title Scene", width / 2, height / 2);
  textSize(30);
  text("ENTER to Start", width / 2, height / 2 + 80);
  if (keyCode == ENTER) {
    state = 1;
  }
}

void gameScene() {
  textSize(50);
  textAlign(RIGHT, TOP);
  tanniY += 8;
  image(playerImage, mouseX, 520);
  tanniY += 8;
  image(tanniImage, tanniX, tanniY);
  if (height < tanniY - 50) {
    resetTanni();
  }
  if (dist(mouseX, 520, tanniX, tanniY) < 80) {
    resetTanni();
    score++;
  }
  text("score: " + score, width, 0);
  if (10 <= score) {
    state = 2;
  }
}

void resultScene() {
  textSize(70);
  textAlign(CENTER, CENTER);
  text("Result Scene", width / 2, height / 2);
  textSize(30);
  text("ENTER to play again / ESC to exit", width / 2, height / 2 + 80);
  if (keyCode == ENTER) {
    score = 0;
    state = 0;
  } else if (keyCode == ESC) {
    exit();
  }
}