path-game/src/pathgame/gameplay/menu/BaseMenu.java

package pathgame.gameplay.menu;

import me.hammerle.snuviengine.api.KeyBinding;
import pathgame.gameplay.Gamestate;
import pathgame.gameplay.Keys;
import pathgame.gameplay.Level;

/**
 * Base class of the menus
 *
 * @author julia
 */
public abstract class BaseMenu
{
    private final int id;
    private int index = 0;

    public abstract MenuButton[] getOptions();
    private int returnId;

    /**
     * Contructor generating and initializing the menu
     *
     * @param id the id of the desired menu
     */
    public BaseMenu(int id)
    {
        this.id = id;
    }

    /**
     * Returns the index of the active menu button
     *
     * @return the index of the active menu button
     */
    public int getActiveIndex()
    {
        return index;
    }

    /**
     * Returns if this is the OptionMenu
     *
     * @return if this is the OptionMenu
     */
    public boolean isOptionMenu()
    {
        return false;
    }

    /**
     * Updates the menu state every gametick based on user input and returns the
     * id of the current menu
     *
     * @param gamestate the gamestate
     * @param level a level containing the current map and the current player
     *
     * @return the id of the current menu
     */
    public int tick(Gamestate gamestate, Level level)
    {
        returnId = id;
        if(isKeyPressed(Keys.UP_KEY) || isKeyPressed(Keys.CAM_UP_KEY))
        {
            int length = getOptions().length;
            index = ((index - 1) + length) % length;
        }
        else if(isKeyPressed(Keys.DOWN_KEY) || isKeyPressed(Keys.CAM_DOWN_KEY))
        {
            index = (index + 1) % getOptions().length;
        }
        else if(isKeyPressed(Keys.CONFIRM_KEY))
        {
            getOptions()[index].run(gamestate, level);
        }
        if(returnId != id)
        {
            index = 0;
        }
        return returnId;
    }

    /**
     * Sets the id of the current menu
     *
     * @param id the id of the current menu
     *
     */
    public void setReturnId(int id)
    {
        returnId = id;
    }

    /**
     * Resets the index of the current button to the first button
     *
     */
    public void resetIndex()
    {
        index = 0;
    }

    /**
     * Returns if the key of the parameter is pressed
     *
     * @param key the key that is checked
     * @return if the key is pressed
     */
    private boolean isKeyPressed(KeyBinding key)
    {
        return key.getTime() == 1 || (key.getTime() >= 20 && key.getTime() % 5 == 1);
    }

}