/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.io.fs;

import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.verify;
import static org.neo4j.function.Predicates.alwaysFalse;
import static org.neo4j.io.fs.FileVisitors.onlyMatching;

import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.FileVisitor;
import java.nio.file.Path;
import org.junit.jupiter.api.Test;

class OnlyMatchingFileVisitorTest {
    @SuppressWarnings("unchecked")
    private final FileVisitor<Path> wrapped = mock(FileVisitor.class);

    @Test
    void shouldNotDelegatePreVisitDirectoryIfPredicateDoesntMatch() throws IOException {
        onlyMatching(alwaysFalse(), wrapped).preVisitDirectory(null, null);
        verify(wrapped, never()).preVisitDirectory(any(), any());
    }

    @Test
    void shouldNotDelegatePostVisitDirectoryIfPredicateDoesntMatch() throws IOException {
        onlyMatching(alwaysFalse(), wrapped).postVisitDirectory(null, null);
        verify(wrapped, never()).postVisitDirectory(any(), any());
    }

    @Test
    void shouldNotDelegateVisitFileIfPredicateDoesntMatch() throws IOException {
        onlyMatching(alwaysFalse(), wrapped).visitFile(null, null);
        verify(wrapped, never()).visitFile(any(), any());
    }

    @Test
    void shouldNotDelegateVisitFileFailedIfPredicateDoesntMatch() throws IOException {
        onlyMatching(alwaysFalse(), wrapped).visitFileFailed(null, null);
        verify(wrapped, never()).visitFileFailed(any(), any());
    }

    @Test
    void shouldNotSkipSubtreeFromPreVisitDirectoryIfPredicateDoesntMatch() throws IOException {
        assertThat(onlyMatching(alwaysFalse(), wrapped).preVisitDirectory(null, null))
                .isEqualTo(FileVisitResult.SKIP_SUBTREE);
    }

    @Test
    void shouldContinueAfterPostVisitDirectoryIfPredicateDoesntMatch() throws IOException {
        assertThat(onlyMatching(alwaysFalse(), wrapped).postVisitDirectory(null, null))
                .isEqualTo(FileVisitResult.CONTINUE);
    }

    @Test
    void shouldContinueAfterVisitFileIfPredicateDoesntMatch() throws IOException {
        assertThat(onlyMatching(alwaysFalse(), wrapped).visitFile(null, null)).isEqualTo(FileVisitResult.CONTINUE);
    }

    @Test
    void shouldContinueAfterVisitFileFailedIfPredicateDoesntMatch() throws IOException {
        assertThat(onlyMatching(alwaysFalse(), wrapped).visitFileFailed(null, null))
                .isEqualTo(FileVisitResult.CONTINUE);
    }
}
