package jp.ac.u_ryukyu.ie.cr.jungleNetwork.persistent;


import jp.ac.u_ryukyu.ie.cr.jungle.Jungle;
import jp.ac.u_ryukyu.ie.cr.jungle.JungleTree;
import jp.ac.u_ryukyu.ie.cr.jungle.data.list.List;
import jp.ac.u_ryukyu.ie.cr.jungle.persistent.ChangeList;
import jp.ac.u_ryukyu.ie.cr.jungle.store.TreeContext;
import jp.ac.u_ryukyu.ie.cr.jungle.store.TreeEditor;
import jp.ac.u_ryukyu.ie.cr.jungle.store.impl.TreeNode;
import jp.ac.u_ryukyu.ie.cr.jungle.store.impl.logger.DefaultTreeOperationLog;
import jp.ac.u_ryukyu.ie.cr.jungle.store.impl.logger.TreeOperationLog;
import jp.ac.u_ryukyu.ie.cr.jungle.store.operations.TreeOperation;
import jp.ac.u_ryukyu.ie.cr.jungle.transaction.DefaultTreeNode;
import jp.ac.u_ryukyu.ie.cr.jungle.traverser.InterfaceTraverser;

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

public class PersistentJungle implements Jungle {
    private PersistentJournal journal;
    private ConcurrentHashMap<String, JungleTree> trees;
    final private String uuid;
    private TreeEditor editor;

    public PersistentJungle(PersistentJournal _journal, String _uuid, TreeEditor _editor) {
        journal = _journal;
        trees = new ConcurrentHashMap<String, JungleTree>();
        uuid = _uuid;
        editor = _editor;
    }

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

    @Override
    public JungleTree createNewTree(final String name) {
        ChangeList list = new ChangeList() {
            @Override
            public Iterator<TreeOperation> iterator() {
                List<TreeOperation> nil = new List();
                return nil.iterator();
            }

            @Override
            public String uuid() {
                return uuid;
            }

            @Override
            public String getTreeName() {
                return name;
            }

            @Override
            public TreeOperationLog getLog() {
                return new DefaultTreeOperationLog();
            }
        };
        TreeNode root = new DefaultTreeNode();
        InterfaceTraverser traverser = new InterfaceTraverser(root, true);
        TreeContext tc = new PersistentTreeContext(root, null, list, uuid, name, 0, traverser);
        JungleTree newTree = new PersistentJungleTree(name, tc, uuid, journal.getWriter(), editor, 0);
        if (trees.putIfAbsent(name, newTree) != null) {
            return null;
        }
        return newTree;
    }

    @Override
    public Iterator<String> getTreeNames() {
        Enumeration<String> treeNames = trees.keys();
        return new Iterator<String>() {

            @Override
            public boolean hasNext() {
                return treeNames.hasMoreElements();
            }

            @Override
            public String next() {
                return treeNames.nextElement();
            }
        };
    }
}