//Name: Alex Valickis
//Program: Interactive Toy
//Description: An interactive toy that models an infinate runner. 
//             The player is the circle on the left and must jump over the obstacle that aproaches from the right of the sceen. 
//             The obstacles approach at randome speeds and the player will loose 100 points if they touch it.
//Controls: SpaceBar - Jump


//Variable declaration and instantiation.
boolean goingDown = false;
int groundY = 275;
int spikeX1 = 400;
int spikeY1 = 300;
int spikeX2 = 450;
int spikeY2 = 300;
int spikeX3 = 425;
int spikeY3 = 250;
int score = 0;
float rand1 = random(0, 255);
float rand2 = random(0, 255);
float rand3 = random(0, 255);
float speed = random(5, 10);

//Setup function that defines the frame rate and screen size
void setup()
{
  frameRate(80);
  size(400, 400);
  smooth();
  rectMode(CORNERS);
  //background
  background(rand1, rand2, rand3);
  //Ground
  noStroke();
  fill(0, 60);
  rect(-5, 400, 400, 300);
}

//Main function
void draw() {
  //Displays the character
  displayCharacter();
  //Displays the spike
  displaySpike();
  //Checks if the user has pressed the jump button
  checkJump();
  //Checks if the player has gained or lost points
  checkScore();
}

//Creates the background and the ground layers
void setStage() {
  //Draws the background with the predefined ranom colours
  background(rand1, rand2, rand3);
  noStroke();
  //Draws the ground  
  fill(0, 60);  
  rect(-5, 400, 400, 300);
  //Displays the score on the screen
  textSize(20);
  fill(0);
  text("Score:", 100, 30);
  text(score, 170, 30);
}

//Updates the Character
void updateCharacter() {
  //Draws the circle at the predefined hight
  stroke(1);
  fill(255, 200);
  ellipse(80, groundY, 50, 50);
}

//Updates the Spike
void updateSpike() {
  //Draws the triangle at the predifned coordinates
  stroke(1);
  fill(255, 200);
  triangle(spikeX1, spikeY1, spikeX2, spikeY2, spikeX3, spikeY3);
}

//Checks if the player has pressed the jump button
void checkJump() {
  //
  if (keyPressed == true) {
    if (key == ' ') {
      if (goingDown == false) {
        //Move the character up
        groundY -= 10;
        //Redraw the stage
        setStage();
        //Redraw the charatcer
        updateCharacter();
        //When the player jumps change the background colour
        if (groundY == 235) {
          changeBackground();
          goingDown = true;
        }
      }
    }
  }
  //Bring the character back down
  if (groundY != 275 || goingDown == true) {
    if (groundY != 275) {
      groundY += 5;
      if (groundY < 150)
      {
        groundY += 10;
      }
      //Redraw the stage
      setStage();
      //Redraw the character
      updateCharacter();
    }
    goingDown = false;
  }
  //move the spike left
  moveSpike();
}

//Changes the background colour
void changeBackground() {
  rand1 = random(0, 255);
  rand2 = random(0, 255);
  rand3 = random(0, 255);
}

//Moves the spike left
void moveSpike() {
  //Moves the spike left at the predefined speed 
  if (spikeX2 > 0) {
    spikeX1 -= speed;
    spikeX2 -= speed;
    spikeX3 -= speed;
    //Redraw the stage
    setStage();
    //Redraw the character
    updateCharacter();
    //Redraw the spike
    updateSpike();
  }
  //Reset the spike on the right side when it goes off the left side of the screen
  if (spikeX2 <= 0) {
    //Randomise the speed
    speed = random(7, 12);
    spikeX1 = 400;
    spikeX2 = 450;
    spikeX3 = 425;
  }
}

//Check whether the player has gained or lost points
void checkScore() {
  //If the player has jumped over the spike
  if (groundY < 250) {
    if (spikeX3 == 75 || spikeX3 == 76 || spikeX3 == 77 || spikeX3 == 78 || spikeX3 == 79 || spikeX3 == 80 || spikeX3 == 81|| spikeX3 == 82 || spikeX3 == 83 || spikeX3 == 84 || spikeX3 == 85) {
      //Add points
      score += 100;
      //Redraw stage
      setStage();
      //Redraw character
      updateCharacter();
      //Redraw spike
      updateSpike();
    }
    //If the player hit the spike
  } else {
    if (spikeX3 == 75 || spikeX3 == 76 || spikeX3 == 77 || spikeX3 == 78 || spikeX3 == 79 || spikeX3 == 80 || spikeX3 == 81|| spikeX3 == 82 || spikeX3 == 83 || spikeX3 == 84 || spikeX3 == 85) {
      //Subtract points
      score -= 100;
      //Redraw stage
      setStage();
      //Redraw character
      updateCharacter();
      //Redraw spike
      updateSpike();
    }
  }
}

//Displays the character at the predefined location
void displayCharacter() {
  stroke(1);
  fill(255, 200);
  ellipse(80, groundY, 50, 50);
}

//Displays the Spike at the predefined location
void displaySpike() {
  stroke(1);
  fill(255, 200);
  triangle(spikeX1, spikeY1, spikeX2, spikeY2, spikeX3, spikeY3);
}