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/*  This line allows the compiler to understand the

*   graphics functions

*/
#include <graphics_lib.h>
#include <math.h>

#define XINITIALROCKETPOSITION 135
#define YINITIALROCKETPOSITION 450
#define XMARSPOSITION 800
#define YMARSPOSITION 0

struct positionVector
{
    double x;
    double y;
};

struct velocityVector
{
    double x;
    double y;
};


void drawBackground();
void drawRocket(struct positionVector *drawPosition);
void calculateInitialVelocity(struct velocityVector *initialVelocity);
void calculateRocketMovement(struct positionVector *position, struct velocityVector *velocity, double rocketTime);
double pythagoras(struct positionVector rocketPosition, struct positionVector objectPosition);

double xRocketVelocity, yRocketVelocity;
struct positionVector rocketPosition, marsPosition;
struct velocityVector rocketVelocity;



int main(void)

{
    double programTime = 0;
    rocketPosition.x = XINITIALROCKETPOSITION;
    rocketPosition.y = YINITIALROCKETPOSITION;
    marsPosition.x = XMARSPOSITION;
    marsPosition.y = YMARSPOSITION;
    double directDistance = pythagoras(rocketPosition, marsPosition);
    double marsRadius = 240.41;

    GFX_InitWindow(800, 600);
    GFX_InitBitmap();
    drawRocket(&rocketPosition);
    calculateInitialVelocity(&rocketVelocity);
    while (directDistance > marsRadius)
    {
        drawRocket(&rocketPosition);
        calculateRocketMovement(&rocketPosition, &rocketVelocity, programTime);
        directDistance = pythagoras(rocketPosition, marsPosition);
        programTime = programTime + 1;
    }


    /* Wait for a user's signal to exit*/
    printf("Please press enter");
    getchar();



    /* remove the display */

    GFX_CloseWindow();



    return 0;

}

drawBackground()
{
    BITMAP background;
    background = GFX_LoadBitmap("background.bmp");
    GFX_DrawBitmap(background, 400, 300);
    GFX_FreeBitmap(background);
}


drawRocket(struct positionVector drawPosition)
{
    GFX_ClearWindow();
    drawBackground();
    BITMAP rocket;
    rocket = GFX_LoadBitmap("rocket.bmp");
    GFX_MakeImageBGTransparent(rocket, 255, 255, 255);
    GFX_DrawBitmap(rocket, drawPosition.x, drawPosition.y);
    GFX_FreeBitmap(rocket);
    GFX_UpdateDisplay();
}

calculateInitialVelocity(struct velocityVector *initialVelocity)
{
    double velocity, angle;
    printf("Please enter in the velocity to launch the rocket at\n");
    scanf("%lf", &velocity);
    printf("Please enter in the angle to launch the rocket at (in degrees)\n");
    scanf("%lf", &angle);
    angle = angle * M_PI / 180;
    *initialVelocity->x = velocity * cos(angle);
    *initialVelocity->y = velocity * sin(angle);
}

calculateRocketMovement(struct positionVector *position, struct velocityVector *velocity, double programTime)
{
    *position->x = XINITIALROCKETPOSITION + *velocity->x * programTime;
    *position->y = YINITIALROCKETPOSITION - *velocity->y * programTime;
}

double pythagoras(struct positionVector rocketPosition, struct positionVector objectPosition)
{
    rocketPosition.x = rocketPosition.x - objectPosition.x;
    rocketPosition.x = pow(rocketPosition.x, 2);
    rocketPosition.y = objectPosition.y - rocketPosition.y;
    rocketPosition.y = pow(rocketPosition.y, 2);
    double distance = sqrt(rocketPosition.x + rocketPosition.y);
    return distance;
}