/*
 * 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
 *
 *      https://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.commons.io.file;

import static org.apache.commons.io.file.CounterAssertions.assertCounts;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import org.apache.commons.io.file.Counters.PathCounters;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;

/**
 * Tests {@link DeletingPathVisitor}.
 */
class DeletingPathVisitorTest extends AbstractTempDirTest {

    private static final String ARGS = "org.apache.commons.io.file.TestArguments#";

    private void applyDeleteEmptyDirectory(final DeletingPathVisitor visitor) throws IOException {
        Files.walkFileTree(tempDirPath, visitor);
        assertCounts(1, 0, 0, visitor);
    }

    /**
     * Tests an empty folder.
     */
    @ParameterizedTest
    @MethodSource(ARGS + "deletingPathVisitors")
    void testDeleteEmptyDirectory(final DeletingPathVisitor visitor) throws IOException {
        applyDeleteEmptyDirectory(visitor);
        // This will throw if not empty.
        Files.deleteIfExists(tempDirPath);
    }

    /**
     * Tests an empty folder.
     */
    @ParameterizedTest
    @MethodSource(ARGS + "pathCounters")
    void testDeleteEmptyDirectoryNullCtorArg(final PathCounters pathCounters) throws IOException {
        applyDeleteEmptyDirectory(new DeletingPathVisitor(pathCounters, (String[]) null));
        // This will throw if not empty.
        Files.deleteIfExists(tempDirPath);
    }

    /**
     * Tests a directory with one file of size 0.
     */
    @ParameterizedTest
    @MethodSource(ARGS + "deletingPathVisitors")
    void testDeleteFolders1FileSize0(final DeletingPathVisitor visitor) throws IOException {
        PathUtils.copyDirectory(Paths.get("src/test/resources/org/apache/commons/io/dirs-1-file-size-0"), tempDirPath);
        assertCounts(1, 1, 0, PathUtils.visitFileTree(visitor, tempDirPath));
        // This will throw if not empty.
        Files.deleteIfExists(tempDirPath);
    }

    /**
     * Tests a directory with one file of size 1.
     */
    @ParameterizedTest
    @MethodSource(ARGS + "deletingPathVisitors")
    void testDeleteFolders1FileSize1(final DeletingPathVisitor visitor) throws IOException {
        PathUtils.copyDirectory(Paths.get("src/test/resources/org/apache/commons/io/dirs-1-file-size-1"), tempDirPath);
        assertCounts(1, 1, 1, PathUtils.visitFileTree(visitor, tempDirPath));
        // This will throw if not empty.
        Files.deleteIfExists(tempDirPath);
    }

    /**
     * Tests a directory with one file of size 1 but skip that file.
     */
    @ParameterizedTest
    @MethodSource(ARGS + "pathCounters")
    void testDeleteFolders1FileSize1Skip(final PathCounters pathCounters) throws IOException {
        PathUtils.copyDirectory(Paths.get("src/test/resources/org/apache/commons/io/dirs-1-file-size-1"), tempDirPath);
        final String skipFileName = "file-size-1.bin";
        final CountingPathVisitor visitor = new DeletingPathVisitor(pathCounters, skipFileName);
        assertCounts(1, 1, 1, PathUtils.visitFileTree(visitor, tempDirPath));
        final Path skippedFile = tempDirPath.resolve(skipFileName);
        Assertions.assertTrue(Files.exists(skippedFile));
        Files.delete(skippedFile);
    }

    /**
     * Tests a directory with two subdirectories, each containing one file of size 1.
     */
    @ParameterizedTest
    @MethodSource(ARGS + "deletingPathVisitors")
    void testDeleteFolders2FileSize2(final DeletingPathVisitor visitor) throws IOException {
        PathUtils.copyDirectory(Paths.get("src/test/resources/org/apache/commons/io/dirs-2-file-size-2"), tempDirPath);
        assertCounts(3, 2, 2, PathUtils.visitFileTree(visitor, tempDirPath));
        // This will throw if not empty.
        Files.deleteIfExists(tempDirPath);
    }

    @Test
    void testEqualsHashCode() {
        final DeletingPathVisitor visitor0 = DeletingPathVisitor.withLongCounters();
        final DeletingPathVisitor visitor1 = DeletingPathVisitor.withLongCounters();
        assertEquals(visitor0, visitor0);
        assertEquals(visitor0, visitor1);
        assertEquals(visitor1, visitor0);
        assertEquals(visitor0.hashCode(), visitor0.hashCode());
        assertEquals(visitor0.hashCode(), visitor1.hashCode());
        assertEquals(visitor1.hashCode(), visitor0.hashCode());
        visitor0.getPathCounters().getByteCounter().increment();
        assertEquals(visitor0, visitor0);
        assertNotEquals(visitor0, visitor1);
        assertNotEquals(visitor1, visitor0);
        assertEquals(visitor0.hashCode(), visitor0.hashCode());
        assertNotEquals(visitor0.hashCode(), visitor1.hashCode());
        assertNotEquals(visitor1.hashCode(), visitor0.hashCode());
    }

    /**
     * Tests https://issues.apache.org/jira/browse/IO-850
     */
    @Test
    void testIO850DirectoriesAndFiles() throws IOException {
        final Path rootDir = Files.createDirectory(managedTempDirPath.resolve("IO850"));
        createTempSymbolicLinkedRelativeDir(rootDir);
        final Path targetDir = rootDir.resolve(SUB_DIR);
        final Path symlinkDir = rootDir.resolve(SYMLINKED_DIR);
        Files.write(targetDir.resolve("file0.txt"), "Hello".getBytes(StandardCharsets.UTF_8));
        final Path subDir0 = Files.createDirectory(targetDir.resolve("subDir0"));
        Files.write(subDir0.resolve("file1.txt"), "Hello".getBytes(StandardCharsets.UTF_8));
        final DeletingPathVisitor visitor = DeletingPathVisitor.withLongCounters();
        Files.walkFileTree(rootDir, visitor);
        assertFalse(Files.exists(targetDir));
        assertFalse(Files.exists(symlinkDir));
        assertFalse(Files.exists(rootDir));
        assertTrue(visitor.getPathCounters().getDirectoryCounter().get() > 0);
        assertTrue(visitor.getPathCounters().getFileCounter().get() > 0);
    }

    /**
     * Tests https://issues.apache.org/jira/browse/IO-850
     */
    @Test
    void testIO850DirectoriesOnly() throws IOException {
        final Path rootDir = Files.createDirectory(managedTempDirPath.resolve("IO850"));
        createTempSymbolicLinkedRelativeDir(rootDir);
        final Path targetDir = rootDir.resolve(SUB_DIR);
        final Path symlinkDir = rootDir.resolve(SYMLINKED_DIR);
        final DeletingPathVisitor visitor = DeletingPathVisitor.withLongCounters();
        Files.walkFileTree(rootDir, visitor);
        assertFalse(Files.exists(targetDir));
        assertFalse(Files.exists(symlinkDir));
        assertFalse(Files.exists(rootDir));
        assertTrue(visitor.getPathCounters().getDirectoryCounter().get() > 0);
    }
}