/***********************************************
 *  CS2510 Spring 2011 
 *  Lecture #7.2
 *  Rockets and World Interactions
 ***********************************************/
import tester.*;
import image.*;
import world.*;

// Represents a RocketWorld, providing the necessary images
// We must extend World, but we leave the implementation 
//   to other sub-classes.  
abstract class BaseRocket extends World{
    // Image of the rocket
    Image rocket = new FromFile("rocket.png");
    // Image of rocket flames
    Image flame = new FromFile("flame.png");
}

// The first iteration of Rocket: Taking off
class TakeOff extends BaseRocket{
    int h;
    
    TakeOff(int h){
        this.h = h;
    } 
    
    // Draw the rocket into an EmptyScene
    Scene onDraw(){
        return new EmptyScene(200, 500)
                    .placeImage(rocket, 100, 500-this.h);
    }
    // Move the rocket up on every Tick
    TakeOff onTick(){
        return new TakeOff(this.h + 10);
    }    
}

// The second iteration of Rocket: Landing
class Landing extends BaseRocket{
    int h;
    
    Landing(int h){
        this.h = h;
    } 
    
    // Draw the rocket into an EmptyScene
    Scene onDraw(){
        return new EmptyScene(200, 500)
                    .placeImage(rocket, 100, 500-this.h);
    }
    // Move the rocket down until it lands
    Landing onTick(){
        if(this.h <= 50){
            return this;
        }else{
            return new Landing(this.h - 10);
        }
    }    
}


// The final iteration of Rocket: Land and Taking off
class LandAndTakeOff extends BaseRocket{
    int h;
    boolean landing;
    
    LandAndTakeOff(int h, boolean landing){
        this.h = h;
        this.landing = landing;
    } 
    
    // Draw the rocket, and possibly flames
    Scene onDraw(){
        return this.addFlame(new EmptyScene(200, 500)
                                   .placeImage(rocket, 100, 500-this.h));
    }
    // Add the flames to the given Scene if this rocket isn't landing
    Scene addFlame(Scene scn){
        if(this.landing){
            return scn;
        }else{
            return scn.placeImage(flame, 100, 550-this.h);
        }
    }

    // On tick, decide which direction to move, and whether or not 
    //   we are landing
    LandAndTakeOff onTick(){
        if(this.h <= 50){
            return new LandAndTakeOff(51, false);
        }else{
            if(this.landing){
                return new LandAndTakeOff(this.h - 10, true);
            }else{
                return new LandAndTakeOff(this.h + 10, false);
            }
        }
    }    
}

// Example of Mouse World interactions
class Balloon extends World{
    int x;
    int y;
    
    Balloon(int x, int y){
        this.x = x;
        this.y = y;
    }
    
    // Draw this Balloon into the empty scene
    Scene onDraw(){
        return new EmptyScene(400, 400)
           .placeImage(new Circle(20, "solid", "red"), this.x, this.y);
    }
    // Move the new Balloon up into the Sky
    Balloon onTick(){
        return new Balloon(this.x, this.y - 2);
    }
    // Place the new Balloon where the Mouse was Pressed
    Balloon onMouse(int xx, int yy, String me){
        if(me.equals("button-down")){
            return new Balloon(xx, yy);
        }else{
            return this;
        }
    }
}

// Examples class... Run/instantiated by FunJava 
class WorldExamples{
    // Rocket World Examples
    //** Uncomment the BigBangs to get them to run
    BaseRocket toff = new TakeOff(50);
    //World endTOff = toff.bigBang();
    BaseRocket land = new Landing(500);
    //World endLand = land.bigBang();
    BaseRocket landtoff = new LandAndTakeOff(500, true);    
    //World endLTOff = landtoff.bigBang();
 
    // Mouse/Balloon Example
    World mw = new Balloon(200, 200);
    //** Uncomment the BigBang to get it to run
    //World endMw = mw.bigBang();
}