package Application;

import java.util.ArrayList;

public class MenuManager {

    private ArrayList<Menu> menuList;
    private Menu currentMenu;

    public MenuManager() {
        menuList = new ArrayList<>();
        currentMenu = null;
    }

    public void addMenu(Menu menu) {
        menuList.add(menu);
    }

    public int getSize() {
        if(inRootMenu())
            return menuList.size();
        return currentMenu.getSubMenuList().size();
    }

    public void select(int i) {
        if (currentMenu == null)
            this.currentMenu = menuList.get(i);
        else
            this.currentMenu = currentMenu.getMenu(i);
    }

    public void back() throws Exception {
        if (!this.inRootMenu())
            this.currentMenu = this.currentMenu.getPreviousMenu();
        else
            throw new Exception("Menu is in the root menu, a previous menu doesn't exist");
    }

    public Menu getCurrentMenu() {
        return this.currentMenu;
    }

    public boolean inRootMenu() {
        return this.currentMenu == null;
    }

    public String getFormattedMenuList() {
        StringBuilder result = new StringBuilder();
        ArrayList<Menu> baseMenuList = this.menuList;
        if (!inRootMenu())
            baseMenuList = currentMenu.getSubMenuList();

        for (int i = 0; i < baseMenuList.size(); i++)
            result.append(i + 1).append(": ").append(baseMenuList.get(i).getName()).append("\n");

        return result.toString();
    }

}