/*
 * 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.input;

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

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.io.IOUtils;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

/**
 * Tests {@link CloseShieldInputStream}.
 */
class CloseShieldInputStreamTest {

    private byte[] data;

    private InputStream byteArrayInputStream;

    private InputStream shielded;

    private boolean closed;

    @BeforeEach
    public void setUp() {
        data = new byte[] { 'x', 'y', 'z' };
        byteArrayInputStream = new ByteArrayInputStream(data) {
            @Override
            public void close() {
                closed = true;
            }
        };
        closed = false;
    }

    @Test
    void testAvailableAfterClose() throws Exception {
        final InputStream shadow;
        try (InputStream in = CloseShieldInputStream.wrap(byteArrayInputStream)) {
            assertEquals(3, in.available());
            shadow = in;
        }
        assertEquals(0, shadow.available());
    }

    @Test
    void testAvailableAfterOpen() throws Exception {
        try (InputStream in = CloseShieldInputStream.wrap(byteArrayInputStream)) {
            assertEquals(3, in.available());
        }
    }

    @Test
    void testClose() throws IOException {
        shielded = CloseShieldInputStream.wrap(byteArrayInputStream);
        shielded.close();
        assertFalse(closed, "closed");
        assertEquals(-1, shielded.read(), "read()");
        assertEquals(data[0], byteArrayInputStream.read(), "read()");
    }

    @Test
    void testReadAfterCose() throws Exception {
        final InputStream shadow;
        try (InputStream in = CloseShieldInputStream.wrap(byteArrayInputStream)) {
            assertEquals(3, in.available());
            shadow = in;
        }
        assertEquals(IOUtils.EOF, shadow.read());
    }

    @Test
    void testSystemInOnSystemInNo() throws IOException {
        shielded = CloseShieldInputStream.systemIn(byteArrayInputStream);
        shielded.close();
        assertTrue(closed, "closed");
        assertEquals(data[0], shielded.read(), "read()");
        assertEquals(data[1], byteArrayInputStream.read(), "read()");
    }

    @Test
    void testSystemInOnSystemInYes() throws IOException {
        shielded = CloseShieldInputStream.systemIn(System.in);
        shielded.close();
        assertFalse(closed, "closed");
        assertEquals(-1, shielded.read(), "read()");
        assertEquals(data[0], byteArrayInputStream.read(), "read()");
    }

}
