class Food {
  
  int s = 10;
  float xPos = random(width);
  float yPos = random(height);
  
  color colour;
  
  Food(color colour) {
    this.colour = colour;
  }
  
  void drawFood() {
    fill(colour);
    ellipse(xPos, yPos, s, s);
  }
  
  boolean isTouching(int x, int y) {
    return dist(x, y, xPos, yPos) <= s;
  }
  
}

import ddf.minim.*;
import ddf.minim.signals.*;
import ddf.minim.analysis.*;
import ddf.minim.effects.*;


color snakeColour = color(255, 255, 255);

int currentColour = 0;
color[] colours = {
  color(191, 2, 2),
  color(0, 78, 209),
  color(242, 247, 0),
  color(5, 170, 3),
  color(245, 147, 0),
  color(149, 2, 152),
  color(0, 191, 214),
  color(0, 103, 1)
};

Food currentFood;


Minim minim = new Minim(this);

int currentSound = 0;
boolean soundUp = true;
String[] xyloNames = {
  "F_01",
  "F_02",
  "G_01",
  "G_02",
  "A_01",
  "A_02",
  "B",
  "C_01"
};

AudioSample[] xylos = new AudioSample[xyloNames.length];


float[] x = new float[100];
float[] y = new float[100];
float segLength = 0.1;
int b = 0;
//color of the food
int c = 0;
//up or down the color selection
boolean up = true;

void setup() {
  size(500, 500);
  smooth();
  noCursor();
  
  for (int i = 0; i < xylos.length; i++) {
    xylos[i] =
      minim.loadSample("Xylophone_Single_Note_" + xyloNames[i] + ".mp3");
  }
  
  currentFood = new Food(colours[0]);
}

void draw() {
  //clear clutter
  background(0, 0, 0);
  
  //worm
  strokeWeight(10);
  stroke(snakeColour);
  
  dragSegment(0, mouseX, mouseY);
  for (int i = 1; i < x.length; i++) {
    dragSegment(i, x[i - 1], y[i - 1]);
  }
  
  noStroke();
  
  //worm eye
  fill(snakeColour);
  ellipse(mouseX, mouseY, 15, 15);
  fill(0);
  ellipse(mouseX, mouseY, 10, 10);
  fill(snakeColour);
  ellipse(mouseX, mouseY, 5, 5);
  
  //eat food and spawn new one
  if (currentFood.isTouching(mouseX, mouseY)) {
    snakeColour = currentFood.colour;
    nextAudio().trigger();
    
    //play x amounts of notes    
    currentFood = new Food(nextFoodColour());
    
    //reset worm once too long
    if (segLength > 10) {
      segLength = 0.1;
    } else {
      segLength = segLength + 0.1;
    }
  }

  //draw current meal
  currentFood.drawFood();
}

//how the worm flows
void dragSegment(int i, float xin, float yin) {
  float dx = xin - x[i];
  float dy = yin - y[i];
  float angle = atan2(dy, dx);  
  x[i] = xin - cos(angle) * segLength;
  y[i] = yin - sin(angle) * segLength;
  segment(x[i], y[i], angle);
}

//each segment of the worm
void segment(float x, float y, float a) {
  pushMatrix();
  translate(x, y);
  rotate(a);
  line(0, 0, segLength, 0);
  popMatrix();
}

color nextFoodColour() {
  currentColour += 1;
  if (currentColour >= colours.length) {
    currentColour = 0;
  }
  return colours[currentColour];
}

AudioSample nextAudio() {
  if (soundUp) {
    currentSound += 1;
  } else {
    currentSound -= 1;
  }
  
  if (currentSound < 0 || currentSound >= xylos.length) {
    if (currentSound < 0) {
      currentSound = 0;
    } else {
      currentSound = xylos.length - 1;
    }
    soundUp = !soundUp;
    return nextAudio();
  }
  
  return xylos[currentSound];
}

//close sounds
void stop() {
  for (AudioSample s : xylos) {
    s.close();
  }
  minim.stop();
  super.stop();
}