package alice.jungle.transaction;


import java.io.IOException;
import java.nio.ByteBuffer;

import alice.jungle.operations.NetworkTreeOperationLog;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.JungleTreeEditor;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.core.Node;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.NodePath;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.TreeEditor;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.TreeNode;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.logger.DefaultTreeOperationLog;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.logger.LoggingNodeHook;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.logger.OperationLog;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.logger.TreeOperationLog;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.operations.DefaultTreeOperation;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.operations.NodeOperation;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.operations.TreeOperation;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.trasnformer.AppendChildAt;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.trasnformer.DeleteAttribute;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.trasnformer.DeleteChildAt;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.trasnformer.NodeEditor;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.trasnformer.PutAttribute;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.transaction.TransactionManager;
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;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.IterableConverter;
import jungle.app.bbs.codesegment.NullCodeSegment;

public class NetworkDefaultJungleTreeEditor<T extends TreeNode<T>> implements JungleTreeEditor {

	private final TransactionManager<T> txManager;
	private final T root;
	private final TreeEditor editor;
	private final String treeName;
	private final TreeOperationLog log;
	private boolean exportLog;

	public NetworkDefaultJungleTreeEditor(String _treeName, T _root,TransactionManager<T> _txManager,TreeEditor _editor)
	{
		this(_treeName, _root,_txManager,_editor,new DefaultTreeOperationLog());
	}
	
	public NetworkDefaultJungleTreeEditor(String _treeName, T _root,TransactionManager<T> _txManager,TreeEditor _editor, TreeOperationLog _log)
	{
		treeName = _treeName;
		root = _root;
		txManager = _txManager;
		editor = _editor;
		log = _log;
		exportLog = true;
	}
	
	public static <T1 extends TreeNode<T1>> NetworkDefaultJungleTreeEditor<T1> NewLocalJungleTreeEditor(String _treeName, T1 _root,TransactionManager<T1> _txManager,TreeEditor _editor) {
		NetworkDefaultJungleTreeEditor<T1> treeEditor = new NetworkDefaultJungleTreeEditor<T1>(_treeName, _root,_txManager,_editor,new DefaultTreeOperationLog());
		treeEditor.exportLog = false;
		return treeEditor;
	}

	public static <T1 extends TreeNode<T1>> NetworkDefaultJungleTreeEditor<T1> NewLocalJungleTreeEditor(String _treeName, T1 _root,TransactionManager<T1> _txManager,TreeEditor _editor, TreeOperationLog _log) {
		NetworkDefaultJungleTreeEditor<T1> treeEditor = new NetworkDefaultJungleTreeEditor<T1>(_treeName, _root,_txManager,_editor,_log);
		treeEditor.exportLog = false;
		return treeEditor;
	}
	
	private Either<Error,JungleTreeEditor> _edit(final NodePath _path,NodeEditor _e)
	{
		LoggingNodeHook hook = new LoggingNodeHook(_e);
		Either<Error,T> either = editor.edit(root,_path,hook);
		if(either.isA()){
			return DefaultEither.newA(either.a());
		}
		
		T newNode = either.b();
		OperationLog newLog = hook.getLog();
		
		IterableConverter.Converter<TreeOperation,NodeOperation> converter = new IterableConverter.Converter<TreeOperation,NodeOperation>(){
			@Override
			public TreeOperation conv(NodeOperation _b){
				return new DefaultTreeOperation(_path,_b);
			}
		};
		
		Iterable<TreeOperation> iterable = new IterableConverter<TreeOperation,NodeOperation>(newLog,converter);
		DefaultTreeOperationLog treeOperationLog = new DefaultTreeOperationLog(iterable,newLog.length());
		TreeOperationLog newTreeOpLog = log.append(treeOperationLog);
		
		JungleTreeEditor newEditor;
		if(exportLog) {
			newEditor = new NetworkDefaultJungleTreeEditor<T>(treeName, newNode,txManager,editor,newTreeOpLog);
		} else {
			newEditor = NetworkDefaultJungleTreeEditor.NewLocalJungleTreeEditor(treeName, newNode, txManager, editor, newTreeOpLog);
		}
		return DefaultEither.newB(newEditor);
	}
	
	@Override
	public Either<Error,JungleTreeEditor> addNewChildAt(NodePath _path, int _pos)
	{
		AppendChildAt appendChildAt = new AppendChildAt(_pos);
		return _edit(_path,appendChildAt);
	}

	@Override
	public Either<Error,JungleTreeEditor> deleteChildAt(NodePath _path, int _pos)
	{
		DeleteChildAt deleteChildAt = new DeleteChildAt(_pos);
		return _edit(_path,deleteChildAt);
	}

	@Override
	public Either<Error,JungleTreeEditor> putAttribute(NodePath _path,String _key,ByteBuffer _value)
	{
		PutAttribute putAttribute = new PutAttribute(_key,_value);
		return _edit(_path,putAttribute);
	}

	@Override
	public Either<Error,JungleTreeEditor> deleteAttribute(NodePath _path, String _key)
	{
		DeleteAttribute deleteAttribute = new DeleteAttribute(_key);
		return _edit(_path,deleteAttribute);
	}

	@Override
	public Either<Error,JungleTreeEditor> edit(NodePath _path,NodeEditor _editor)
	{
		return _edit(_path,_editor);
	}

	@Override
	public Either<Error,JungleTreeEditor> success()
	{
		Either<Error,TransactionManager<T>> either = txManager.commit(root,log);
		if(either.isA()){
			return DefaultEither.newA(either.a());
		}
		if(exportLog) {
			try {
				putTreeOperationLog(log);
			} catch (IOException e) {
				return DefaultEither.newA(either.a());
			}	
		}

		TransactionManager<T> newTxManager = either.b();
		JungleTreeEditor newTreeEditor = new NetworkDefaultJungleTreeEditor<T>(treeName, root,newTxManager,editor);
		
		return DefaultEither.newB(newTreeEditor);
	}

	@Override
	public String getID()
	{
		return txManager.getUUID();
	}

	@Override
	public String getRevision()
	{
		return Long.toString(txManager.getRevision());
	}

	@Override
	public Node getRoot()
	{
		return root.getAsNode();
	}
	
	public String getTreeName() {
		return treeName;
	}
	
	public TreeOperationLog getTreeOperationLog() {
		return log;
	}

	public void putTreeOperationLog(Iterable<TreeOperation> newLog) throws IOException {
		String uuid = getID();
		String treeName = getTreeName();
		String updaterName = getID();
		String revision = getRevision();
		putDataSegment(uuid, treeName, updaterName, newLog, revision);
	}
	
	public void putDataSegment(String _uuid, String _treeName, String _updaterName, Iterable<TreeOperation> newLog, String nextRevision) throws IOException {
		NetworkTreeOperationLog netLog = new NetworkTreeOperationLog(_uuid, _treeName,newLog);
		NullCodeSegment cs = new NullCodeSegment();
		cs.ods.put("log", netLog);
		cs.execute(); /* Do nothing CodeSegment */
	}
}