//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//A Car "Driver" Program
//Description: Tests methods for a car that features color, acceleration, and
// a few stubbed features.
//CS 284
//Programmed by Jonathan Voris
//for 2/1/06
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

class car
{
	private static int speed = 0;
	private static int acceleration = 10;
	private static String color = "black";

	/*Car Color Methods*/

	public static String getColor()
	{
		return color;
	}

	public static void repaint(String newColor)
	{
		//check that the new color is valid before applying the change
		if (isValidColor(newColor))
		{
			color = newColor;
		}
	}

	//isValidColor takes a string representation of a color and returns
	//true if it is a valid one; otherwise it displays an error and returns false
	public static boolean isValidColor(String color)
	{
		if ((color.equals("red")) || (color.equals("black")) ||
			(color.equals("blue")) || (color.equals("green")))
		{
			return true;
		}
		else
		{
			System.out.println(color + " is not a color!");
			return false;
		}
	}

	/*Car Speed Methods*/

	public static int getSpeed()
	{
		return speed;
	}

	//setSpeed is private because it should not be used to directly
	//modify the speed of the car - accelerate and decelerate should
	//be used instead
	private static void setSpeed(int newSpeed)
	{
		//check that the new speed is valid before applying the change
		if (isValidSpeed(newSpeed))
		{
			speed = newSpeed;
		}
	}

	private static int getAcceleration()
	{
		return acceleration;
	}

	public static void accelerate()
	{
		setSpeed(getSpeed() + getAcceleration());
	}

	public static void decelerate()
	{
		setSpeed(getSpeed() - getAcceleration());
	}

	//isValidSpeed takes a int representation of a speed and returns
	//true if it is a valid one; otherwise it displays an error and returns false
	public static boolean isValidSpeed(int speed)
	{
		if (speed > 65)
		{
			//speed is "invalid" because it exceeds the speed limit
			System.out.println("Slow down, you're over the speed limit!");
			return false;
		}
		else if (speed < 0)
		{
			//speed is "invalid" because it is negative
			System.out.println("You've already stopped moving!");
			return false;
		}
		else
		{
			//we must be between 0 and 65 - return true
			return true;
		}
	}

	/*Special Car Modification Methods*/

	//addSpoiler places a spoiler on the car - this is an as-yet unimplemented
	//stub function
	public static void addSpoiler()
	{
		System.out.println("You don't have enough money for a spoiler.");
	}

	//addSpoiler puts rims on the car - this is an as-yet unimplemented
	//stub function
	public static void buyRims()
	{
		System.out.println("You don't have enough money for rims.");
	}

	public static void main(String[] args)
	{
		//test the car object in its base state
		System.out.println("Our new car is parked outside!");
		System.out.println("Car color is " + getColor() + ".");
		System.out.println("Car is travelling at " + getSpeed() + " MPH.");

		System.out.println();

		//test car color
		System.out.println("Let's get the car repainted...");
		//invalid color test
		repaint("fifteen");
		System.out.println("New car color is " + getColor() + ".");
		//valid color test
		repaint("red");
		System.out.println("New car color is " + getColor() + ".");

		System.out.println();

		//test car speed
		System.out.println("Nice. Let's take our new car for a spin.");
		for (int x=0; x<7; x++)
		{
			//test acceleration and upper speed boundary
			accelerate();
			System.out.println("Car is travelling at " + getSpeed() + " MPH.");
		}
		for (int x=0; x<8; x++)
		{
			//test deceleration and upper speed boundary
			decelerate();
			System.out.println("Car is travelling at " + getSpeed() + " MPH.");
		}

		System.out.println();

		//test special car modifications
		System.out.println("Oh snap Xzibit just showed up! Let's pimp our ride.");
		addSpoiler();
		buyRims();
		System.out.println("Too bad, maybe later.");
	}
}