/**
 * 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.metron.rest.service.impl;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.metron.rest.RestException;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import java.io.IOException;

import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.mockito.Mockito.*;

public class HdfsServiceImplExceptionTest {
    private HdfsServiceImpl hdfsService;
    private FileSystem fileSystem;
    private String testDir = "./target/hdfsUnitTest";

    @BeforeEach
    public void setup() throws IOException {
        Configuration configuration = new Configuration();
        hdfsService = mock(HdfsServiceImpl.class, withSettings().useConstructor(configuration).defaultAnswer(CALLS_REAL_METHODS));
        fileSystem = mock(FileSystem.class);
        doReturn(fileSystem).when(hdfsService).getFileSystem();
    }

    @Test
    public void listShouldWrapExceptionInRestException() throws Exception {
      doThrow(new IOException()).when(fileSystem).listStatus(new Path(testDir));
      assertThrows(RestException.class, () -> hdfsService.list(new Path(testDir)));
    }

    @Test
    public void readShouldWrapExceptionInRestException() throws Exception {
      doThrow(new IOException()).when(fileSystem).open(new Path(testDir));
      assertThrows(RestException.class, () -> hdfsService.read(new Path(testDir)));
    }

    @Test
    public void writeShouldWrapExceptionInRestException() throws Exception {
        doThrow(new IOException()).when(fileSystem).create(new Path(testDir), true);
        assertThrows(RestException.class,
                () -> hdfsService.write(new Path(testDir), "contents".getBytes(UTF_8),null, null,null));
    }

    @Test
    public void writeShouldThrowIfInvalidPermissions() {
        assertThrows(RestException.class,
                () -> hdfsService.write(new Path(testDir,"test"),"oops".getBytes(UTF_8), "foo", "r-x","r--"));
    }

    @Test
    public void deleteShouldWrapExceptionInRestException() throws Exception {
        doThrow(new IOException()).when(fileSystem).delete(new Path(testDir), false);
        assertThrows(RestException.class, () -> hdfsService.delete(new Path(testDir), false));
    }
}