import javafx.scene.image.Image;

/**
 * This class handles the sprite animation of the player.
 * Code originally from https://github.com/foreignguymike/legacyYTtutorials/tree/master/dragontale , but modified for the purposes
 * of CS-230 A2.
 * @Author ForeignGuyMike
 * @Author Radu Bucurescu
 */

public class SpriteAnimation {

    private Image[] frames;
    private int currentFrame;

    private long startTime;
    private long delay;

    private boolean playedOnce;

    /**
     * Initialise the animator for the player's sprite.
     */
    public SpriteAnimation() {
        playedOnce = false;
    }

    /**
     * Set the frames of the current animation.
     * @param frames The sprites.
     */
    public void setFrames(Image[] frames) {
        this.frames = frames;
        currentFrame = 0;
        startTime = System.nanoTime();
        playedOnce = false;
    }

    /**
     * Set the delay between frames.
     * @param d The time in milliseconds.
     */
    public void setDelay(long d) {
        delay = d;
    }

    /**
     * Set the current frame of the animation.
     * @param i The index of the frame.
     */
    public void setFrame(int i) {
        currentFrame = i;
    }

    /**
     * Update the animation.
     */
    public void update() {
        if(delay == -1) return;

        long elapsed = (System.nanoTime() - startTime) / 1000000;

        if(elapsed > delay) {

            currentFrame++;
            startTime = System.nanoTime();
        }
        if(currentFrame == frames.length) {

            currentFrame = 0;
            playedOnce = true;
        }
    }

    /**
     * Get the index of the current frame of the animation.
     * @return The index.
     */
    public int getFrame() {
        return currentFrame;
    }

    /**
     * Get the current frame in the animation.
     * @return The frame.
     */
    public Image getImage() {
        return frames[currentFrame];
    }

    /**
     * Checks if the animation has played at least once.
     * @return playedOnce.
     */
    public boolean hasPlayedOnce() {
        return playedOnce;
    }

}