// /**
//  * File: StorageAreaContainer.cs
//  * Author: haraldwolff
//  *
//  * This file and it's content is copyrighted by the Author and / or copyright holder.
//  * Any use wihtout proper permission is illegal and may lead to legal actions.
//  *
//  *
//  **/
using System;
using ln.types.btree;
using ln.logging;
namespace ln.types.odb.ng.storage
{
    public class StorageAreaContainer
    {
        public bool DEBUG = false;

        public int SplitLimit { get; set; } = 32;

        MappingBTree<int, StorageArea> storageAreas = new MappingBTree<int, StorageArea>((value)=>value.Offset);

        public StorageAreaContainer()
        {
        }

        public StorageArea Push(StorageArea storageArea)
        {
            if (DEBUG)
                Logging.Log(LogLevel.DEBUG, "StorageAreaContainer: Push: {0}", storageArea);

            storageAreas.Add(storageArea);

            try
            {
                StorageArea previousStorageArea = storageAreas.Previous(storageArea);
                if ((previousStorageArea != null) && (previousStorageArea.NextOffset == storageArea.Offset))
                {
                    previousStorageArea.Size += storageArea.Size;
                    storageAreas.Remove(storageArea);
                    storageArea = previousStorageArea;
                }
            } catch
            {
            }

            try
            {
                StorageArea nextStorageArea = storageAreas.Next(storageArea);
                if ((nextStorageArea != null) && (storageArea.NextOffset == nextStorageArea.Offset))
                {
                    storageArea.Size += nextStorageArea.Size;
                    storageAreas.Remove(nextStorageArea);
                }
            } catch
            { }


            return storageArea;
        }

        public StorageArea Pop(int minSize)
        {
            foreach (StorageArea storageArea in storageAreas)
            {
                if (storageArea.Size >= minSize)
                {
                    if (DEBUG)
                        Logging.Log(LogLevel.DEBUG, "StorageAreaContainer: Pop: {0}", storageArea);

                    storageAreas.RemoveKey(storageArea.Offset);
                    return storageArea;
                }
            }
            return null;
        }

    }
}