
/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You 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.
==================================================================== */

package org.apache.poi.poifs.filesystem;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.io.ByteArrayInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Iterator;

import org.apache.poi.poifs.property.DirectoryProperty;
import org.apache.poi.poifs.property.DocumentProperty;
import org.junit.jupiter.api.Test;

/**
 * Class to test DirectoryNode functionality
 */
final class TestDirectoryNode {

    /**
     * test trivial constructor (a DirectoryNode with no children)
     */
    @Test
    void testEmptyConstructor() throws IOException {
        try (POIFSFileSystem fs = new POIFSFileSystem()) {
            DirectoryProperty property1 = new DirectoryProperty("parent");
            DirectoryProperty property2 = new DirectoryProperty("child");
            DirectoryNode parent = new DirectoryNode(property1, fs, null);
            DirectoryNode node = new DirectoryNode(property2, fs, parent);

            assertEquals(0, parent.getPath().length());
            assertEquals(1, node.getPath().length());
            assertEquals("child", node.getPath().getComponent(0));

            // verify that getEntries behaves correctly
            int count = 0;
            Iterator<Entry> iter = node.getEntries();

            while (iter.hasNext()) {
                count++;
                iter.next();
            }
            assertEquals(0, count);

            // verify behavior of isEmpty
            assertTrue(node.isEmpty());

            // verify behavior of getEntryCount
            assertEquals(0, node.getEntryCount());

            // verify behavior of getEntry
            assertThrows(FileNotFoundException.class, () -> node.getEntry("foo"));

            // verify behavior of isDirectoryEntry
            assertTrue(node.isDirectoryEntry());

            // verify behavior of getName
            assertEquals(property2.getName(), node.getName());

            // verify behavior of isDocumentEntry
            assertFalse(node.isDocumentEntry());

            // verify behavior of getParent
            assertEquals(parent, node.getParent());
        }
    }

    /**
     * test non-trivial constructor (a DirectoryNode with children)
     */
    @Test
    void testNonEmptyConstructor() throws IOException {
        DirectoryProperty property1 = new DirectoryProperty("parent");
        DirectoryProperty property2 = new DirectoryProperty("child1");

        property1.addChild(property2);
        property1.addChild(new DocumentProperty("child2", 2000));
        property2.addChild(new DocumentProperty("child3", 30000));

        try (POIFSFileSystem fs = new POIFSFileSystem()) {
            DirectoryNode node = new DirectoryNode(property1, fs, null);

            // verify that getEntries behaves correctly
            int count = 0;
            Iterator<Entry> iter = node.getEntries();

            while (iter.hasNext()) {
                count++;
                iter.next();
            }
            assertEquals(2, count);

            // verify behavior of isEmpty
            assertFalse(node.isEmpty());

            // verify behavior of getEntryCount
            assertEquals(2, node.getEntryCount());

            // verify behavior of getEntry
            DirectoryNode child1 = (DirectoryNode) node.getEntry("child1");

            child1.getEntry("child3");
            node.getEntry("child2");
            assertThrows(FileNotFoundException.class, () -> node.getEntry("child3"));

            // verify behavior of isDirectoryEntry
            assertTrue(node.isDirectoryEntry());

            // verify behavior of getName
            assertEquals(property1.getName(), node.getName());

            // verify behavior of isDocumentEntry
            assertFalse(node.isDocumentEntry());

            // verify behavior of getParent
            assertNull(node.getParent());
        }
    }

    /**
     * test deletion methods
     */
    @Test
    void testDeletion() throws IOException {
        try (POIFSFileSystem fs   = new POIFSFileSystem()) {
            DirectoryEntry root = fs.getRoot();

            // verify cannot delete the root directory
            assertFalse(root.delete());
            assertTrue(root.isEmpty());

            DirectoryEntry dir = fs.createDirectory("myDir");

            assertFalse(root.isEmpty());
            assertTrue(dir.isEmpty());

            // verify can delete empty directory
            assertFalse(root.delete());
            assertTrue(dir.delete());

            // Now look at a non-empty one
            dir = fs.createDirectory("NextDir");
            DocumentEntry doc =
                    dir.createDocument("foo",
                                       new ByteArrayInputStream(new byte[1]));

            assertFalse(root.isEmpty());
            assertFalse(dir.isEmpty());

            // verify cannot delete non-empty directory
            assertFalse(dir.delete());

            // but we can delete it if we remove the document
            assertTrue(doc.delete());
            assertTrue(dir.isEmpty());
            assertTrue(dir.delete());

            // It's really gone!
            assertTrue(root.isEmpty());

        }
    }

    /**
     * test change name methods
     */
    @Test
    void testRename() throws IOException {
        try (POIFSFileSystem fs   = new POIFSFileSystem()) {
            DirectoryEntry root = fs.getRoot();

            // verify cannot rename the root directory
            assertFalse(root.renameTo("foo"));
            DirectoryEntry dir = fs.createDirectory("myDir");

            assertTrue(dir.renameTo("foo"));
            assertEquals("foo", dir.getName());
            DirectoryEntry dir2 = fs.createDirectory("myDir");

            assertFalse(dir2.renameTo("foo"));
            assertEquals("myDir", dir2.getName());
            assertTrue(dir.renameTo("FirstDir"));
            assertTrue(dir2.renameTo("foo"));
            assertEquals("foo", dir2.getName());
        }
    }
}