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

import java.util.Iterator;
import java.util.TreeMap;
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;
import jp.ac.u_ryukyu.ie.cr.tatsuki.jungle.store.index.Index;
import jp.ac.u_ryukyu.ie.cr.tatsuki.jungle.store.index.ParentIndex;

public class DefaultJungle implements Jungle {
    private Journal journal;
    private ConcurrentHashMap<String, JungleTree> trees;
    private String uuid;
    private TreeEditor editor;

    public static void main(String args[]) {
        DefaultJungle j = new DefaultJungle(null, "hoge",
                new DefaultTreeEditor(new DefaultTraverser()));
        JungleTree t = j.createNewTree("fuga");

        JungleTreeEditor e1 = t.getTreeEditor();

        DefaultNodePath root = new DefaultNodePath();

        Either<Error, JungleTreeEditor> 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) {
        this.journal = new NullJournal();
        this.trees = new ConcurrentHashMap<String, JungleTree>();
        this.uuid = uuid;
        this.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 = List.nil();
                return nil.iterator();
            }

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

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

        };

        DefaultTreeNode root = new DefaultTreeNode();
        TreeMap<String, TreeMap<String, List<TreeNode>>> indexList = new Index().getIndex();
        TreeMap<TreeNode, TreeNode> parentIndex = new ParentIndex().getParentIndex();
        ChangeSet set = new DefaultChangeSet(root, null, list, uuid, name, 0,indexList, parentIndex);
        DefaultTreeContext tc = new DefaultTreeContext(root, set);
        JungleTree newTree = new DefaultJungleTree(tc, uuid,
                journal.getWriter(), editor);
        if (trees.putIfAbsent(name, newTree) != null) {
            return null;
        }
        return newTree;
    }
}