package jp.ac.u_ryukyu.ie.cr.shoshi.jungle.transaction;

import java.nio.ByteBuffer;

import fj.data.List;
import fj.data.Option;
import fj.data.TreeMap;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.TreeNode;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.TreeNodeAttributes;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.logger.DefaultOperationLog;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.logger.OperationLog;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.operations.DeleteAttributeOperation;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.operations.PutAttributeOperation;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.trasnformer.NodeEditorError;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.DefaultEither;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Either;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Error;

public class DefaultTreeNodeAttribute implements TreeNodeAttributes
{
	public List<TreeNode> children;
	public TreeMap<String,ByteBuffer> attrs;
	OperationLog log ;
	
	public DefaultTreeNodeAttribute(List<TreeNode> _children,TreeMap<String,ByteBuffer> _attrs)
	{
		children = _children;
		attrs = _attrs;
		log = new DefaultOperationLog();
	}
	
	public DefaultTreeNodeAttribute(List<TreeNode> _children,TreeMap<String,ByteBuffer> _attrs,OperationLog _log)
	{
		children = _children;
		attrs = _attrs;
		log = _log;
	}

	@Override
	public TreeMap<String,ByteBuffer> getAttributesAsRawMap(){
		return attrs;
	}
	
	@Override
	public Either<Error,TreeNode> delete(String _key)
	{
		if (_key == null) {
			return DefaultEither.newA(NodeEditorError.NULL_VALUE_NOT_ALLOWED);
		}
		
		if (!attrs.contains(_key)) {
			return DefaultEither.newA(NodeEditorError.DELETE_KEY_NOT_FOUND);
		}
		
		TreeMap<String,ByteBuffer> newMap = attrs.delete(_key);
		TreeNode newNode = new DefaultTreeNode(children,newMap);
		return DefaultEither.newB(newNode);
	}

	@Override
	public Either<Error,TreeNode> put(String _key, ByteBuffer _value)
	{
		if (_key == null || _value == null) {
			return DefaultEither.newA(NodeEditorError.NULL_VALUE_NOT_ALLOWED);
		}
		
		TreeMap<String,ByteBuffer> newMap = attrs.set(_key,_value);
		TreeNode newNode = new DefaultTreeNode(children,newMap);
		return DefaultEither.newB(newNode);
	}

	@Override
	public ByteBuffer get(String _key)
	{
		if (_key == null) {
			return null;
		}
		
		Option<ByteBuffer> result = attrs.get(_key);
		return result.isSome() ? result.some() : null;
	}

    @Override
    public String getString(String key) {
        ByteBuffer attribute = get(key);
        if (attribute != null)
            return new String(attribute.array());
        return null;
    }

    @Override
    public List<String> getKeys() {
      return attrs.keys();
    }
}