/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.elasticsearch.common.io.stream;

import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;

import org.elasticsearch.test.ESTestCase;

public class NamedWriteableRegistryTests extends ESTestCase {

    private static class DummyNamedWriteable implements NamedWriteable {
        DummyNamedWriteable(StreamInput in) {}
        @Override
        public String getWriteableName() {
            return "test";
        }
        @Override
        public void writeTo(StreamOutput out) throws IOException {}
    }

    public void testEmpty() throws IOException {
        new NamedWriteableRegistry(Collections.emptyList()); // does not throw exception
    }

    public void testBasic() throws IOException {
        NamedWriteableRegistry.Entry entry =
            new NamedWriteableRegistry.Entry(NamedWriteable.class, "test", DummyNamedWriteable::new);
        NamedWriteableRegistry registry = new NamedWriteableRegistry(Collections.singletonList(entry));
        Writeable.Reader<? extends NamedWriteable> reader = registry.getReader(NamedWriteable.class, "test");
        assertNotNull(reader.read(null));
    }

    public void testDuplicates() throws IOException {
        NamedWriteableRegistry.Entry entry =
            new NamedWriteableRegistry.Entry(NamedWriteable.class, "test", DummyNamedWriteable::new);
        IllegalArgumentException e = expectThrows(IllegalArgumentException.class,
            () -> new NamedWriteableRegistry(Arrays.asList(entry, entry)));
        assertTrue(e.getMessage(), e.getMessage().contains("is already registered"));
    }

    public void testUnknownCategory() throws IOException {
        NamedWriteableRegistry registry = new NamedWriteableRegistry(Collections.emptyList());
        IllegalArgumentException e = expectThrows(IllegalArgumentException.class, () ->
            registry.getReader(NamedWriteable.class, "test"));
        assertTrue(e.getMessage(), e.getMessage().contains("Unknown NamedWriteable category ["));
    }

    public void testUnknownName() throws IOException {
        NamedWriteableRegistry.Entry entry =
            new NamedWriteableRegistry.Entry(NamedWriteable.class, "test", DummyNamedWriteable::new);
        NamedWriteableRegistry registry = new NamedWriteableRegistry(Collections.singletonList(entry));
        IllegalArgumentException e = expectThrows(IllegalArgumentException.class, () ->
            registry.getReader(NamedWriteable.class, "dne"));
        assertTrue(e.getMessage(), e.getMessage().contains("Unknown NamedWriteable ["));
    }
}