package net.stanixgames.main;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/**
 * Unique ID Generator.
 * How to use it:
 * 1) Select section by using unique word ; If section not exist, it will be created.
 * 2) Generate or Register custom ID ;
 * Default Section is "main".
 * Also, when you using init() method, only current section will be initialized!
 * @author St1nger13
 * date: 05.02.2016
 */
public class UniqueIDGenerator
{
    private static String sectionTargetID = "main" ;
    private static Map<String, HashSet<Integer>> idBase = new HashMap<String, HashSet<Integer>>() ;


    /**
     * Initialization method
     */
    public static void init()
    {
        checkSectionID() ;

        HashSet<Integer> idSectionBase = idBase.get(sectionTargetID) ;
        if(idSectionBase == null)
            idSectionBase = new HashSet<Integer>() ;
        else
            idSectionBase.clear() ;
        idBase.put(sectionTargetID, idSectionBase) ;
    }

    public static void setSectionTarget(String sectionID)
    {
        if(sectionID != null && sectionID.length() > 0)
            sectionTargetID = sectionID ;

        if(!idBase.containsKey(sectionID))
            idBase.put(sectionID, new HashSet<Integer>()) ;
    }

    public static String getSectionTargetID()
    {
        return sectionTargetID ;
    }

    /**
     * Method return unique ID which you can use for your
     * NGuiComponent object
     * @return - Registered unique ID
     */
    public static int generateID()
    {
        checkSectionID() ;

        int temp ;
        boolean flag = false ;
        HashSet<Integer> idSectionBase = null ;
        do
        {
            idSectionBase = idBase.get(sectionTargetID) ;
            temp = idSectionBase.size() +1 ;
            flag = idSectionBase.add(temp) ;

            if(flag)
                idBase.put(sectionTargetID, idSectionBase) ;
        }
        while(!flag) ;

        return temp ;
    }

    /**
     * IF you want to use custon ID value for component, you have to
     * register it here. If method returns FALSE, your ID is not unique
     * and you cannot use it. If TRUE - all is okay, you can use ID for component
     * @param id - Custom ID value
     * @return Status of uniqueness
     */
    public static boolean registerID(int id)
    {
        checkSectionID() ;
        return idBase.get(sectionTargetID).add(id) ;
    }

    private static void checkSectionID()
    {
        if(sectionTargetID == null || sectionTargetID.length() < 1)
            sectionTargetID = "main" ;
    }
}