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public class AssociativeCache extends Cache
{

    public AssociativeCache(int aCacheSize, int aBlockSize)
    {
        super(aCacheSize, aBlockSize);
    }

    public void loadAssociativeCache(int anInstruction, Memory aMemory)
    {
        int memoryRow = anInstruction / Memory.getBlockSize();
        int aTag = memoryRow;
        
        
        if (compareTags(aTag))
        {
            System.out.println("This is a HIT");
            hits++;
            LRUUpdate();
        }
        else if (isThereFreeSpace())
        {
            System.out.println("There is free space left so miss");
            cache[getFreeSpaceIndex()].loadBlock(aMemory.returnBlock(memoryRow), aTag);
            misses++;
            LRUUpdate();
        }
        else
        {
            System.out.println("Cache full, checking LRU, MISS");
            int change = getLeastRecentlyUsedIndex(getHighestLRU());
            cache[change].loadBlock(aMemory.returnBlock(memoryRow), aTag);
            misses++;
            LRUUpdate();
        }
    }
    
    public void LRUUpdate()
    {
        for(int i = 0; i < cache.length; i++)
        {
            if (cache[i].getValidityBit() == true)
            {
                cache[i].setLRU(cache[i].getLRU()+1);
            }
        }
    }
    
    public boolean isThereFreeSpace()
    {
        boolean condition = false;

        for (int i = 0; i < cache.length; i++)
        {
            if (cache[i].getValidityBit()== false)
            {
                condition = true;
                break;
            }
        }
        return condition;
    }
    
    public int getFreeSpaceIndex()
    {
        int freeSpaceIndex = 0;

        for (int i = 0; i < cache.length; i++)
        {
            if (cache[i].getValidityBit()== false)
            {
                freeSpaceIndex = i;
                break;
            }
        }
        return freeSpaceIndex;     
    }
    
    public boolean compareTags(int aTag)
    {
        boolean flag = false;
        
        for (int i = 0; i < cache.length; i++)
        {
            if (cache[i].getCacheTag() == aTag)
            {
                flag = true;
                break;
            }
        }
        return flag;
    }
    
    public int getHighestLRU()
    {
        int highestLRU = 0;
        for (int i = 0; i < cache.length; i ++)
        {
            if (cache[i].getLRU() > highestLRU)
            {
                highestLRU = cache[i].getLRU();
            }
        }
        return highestLRU;
    }
    
    public int getLeastRecentlyUsedIndex(int aHighestLRU)
    {
        int leastRecentlyUsedIndex = 0;
        for (int i = 0; i < cache.length; i++)
        {
            if (cache[i].getLRU() == aHighestLRU)
            {
                leastRecentlyUsedIndex = i;
            }
        }
        return leastRecentlyUsedIndex;
    }
}