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/*-
 * #%L
 * FXFileChooser
 * %%
 * Copyright (C) 2017 - 2022 Oliver Loeffler, Raumzeitfalle.net
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */
package net.raumzeitfalle.fx.dirchooser;

import java.io.File;
import java.io.FileFilter;
import java.nio.file.Path;

import javafx.beans.property.ReadOnlyBooleanProperty;
import javafx.collections.FXCollections;

class DirectoryWalker {

    private Path current;

    private int maxDepth;

    private int currentDepth;

    private DirectoryTreeItem rootNode;

    public DirectoryWalker(Path start) {
        this(start, 0);
    }

    public DirectoryWalker(Path start, int maxDepth) {
        this.current = start;
        this.maxDepth = maxDepth;
        this.currentDepth = 0;
        this.rootNode = new DirectoryTreeItem(start);
    }

    DirectoryTreeItem read(ReadOnlyBooleanProperty cancelled) {
        FileFilter ff = pathname-> {
            if (null == pathname) { return false; }
            return pathname.isDirectory();
        };

        int size = 0;
        for (File f : current.toFile().listFiles(ff)) {
            addNode(f.toPath(), cancelled);
            size += 1;
        }
        this.rootNode.setSize(size);
        return this.rootNode;
    }

    private void addNode(Path path, ReadOnlyBooleanProperty cancelled) {
        if (currentDepth <= maxDepth) {
            if (cancelled.get())
                return;
            DirectoryTreeItem leaf = new DirectoryTreeItem(path);
            rootNode.getChildren().add(leaf);
            /*
             * TODO: Make the directory tree sortable 
             * TODO: Make the directory tree filterable
             * 
             */
            if (cancelled.get())
                return;

            FXCollections.sort(rootNode.getChildren(), 
                              (a, b) -> a.getValue().compareToIgnoreCase(b.getValue()));
        }
    }
}