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

import java.util.Iterator;
import java.util.concurrent.ConcurrentHashMap;

import fj.data.List;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.persistent.ChangeList;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.persistent.Journal;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.persistent.NullJournal;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.ChangeSet;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.TreeEditor;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.DefaultNodePath;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.DefaultTreeEditor;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.TreeNode;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.operations.TreeOperation;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.transaction.DefaultChangeSet;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.transaction.DefaultTreeContext;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.transaction.DefaultTreeNode;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.traverser.DefaultTraverser;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Either;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Error;

public class DefaultJungle<T extends TreeNode<T>> implements Jungle<T>
{
	private Journal journal;
	private ConcurrentHashMap<String,JungleTree<T>> trees;
	private String uuid;
	private TreeEditor editor;
	
	public static <T extends TreeNode<T>>void main(String _args[])
	{
		DefaultJungle<T> j = new DefaultJungle(null,"hoge",new DefaultTreeEditor(new DefaultTraverser()));
		JungleTree<T> t = j.createNewTree("fuga");
		
		JungleTreeEditor<T> e1 = t.getTreeEditor();
		JungleTreeEditor<T> e2 = t.getTreeEditor();
		
		DefaultNodePath root = new DefaultNodePath();
		
		Either<Error,JungleTreeEditor<T>> either = e1.addNewChildAt(root,0);
		e1 = either.b();
		either = e1.addNewChildAt(root.add(0),0);
		e1 = either.b();
		e1.success();
	}
	
	public DefaultJungle(Journal _journal,String _uuid,TreeEditor _editor)
	{
		journal = new NullJournal();
		trees = new ConcurrentHashMap<String,JungleTree<T>>();
		uuid = _uuid;
		editor = _editor;
	}

	@Override
	public JungleTree<T> getTreeByName(String _name)
	{
		return trees.get(_name);
	}

	@Override
	public JungleTree<T> createNewTree(final String _name)
	{
		ChangeList list = new ChangeList(){
			@Override
			public Iterator<TreeOperation> iterator() {
				List<TreeOperation> nil = List.nil();
				return nil.iterator();
			}
			@Override
			public String uuid() {
				return uuid;
			}
			@Override
			public String getTreeName() {
				return _name;
			}
		};
		
		DefaultTreeNode root = new DefaultTreeNode();
		ChangeSet<T> set = new DefaultChangeSet(root,null,list,uuid,_name,0);
		DefaultTreeContext<DefaultTreeNode> tc = new DefaultTreeContext<DefaultTreeNode>(root,set);
		JungleTree newTree = new DefaultJungleTree<DefaultTreeNode>(tc,uuid,journal.getWriter(),editor);
		if(trees.putIfAbsent(_name,newTree) != null){
			return null;
		}
		return newTree;
	}
}