/*
 * Copyright 2017-present Open Networking Laboratory
 *
 * Licensed 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.onosproject.mapping.web.codec;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.onosproject.codec.CodecContext;
import org.onosproject.codec.CodecService;
import org.onosproject.codec.JsonCodec;
import org.onosproject.codec.impl.CodecManager;
import org.onosproject.mapping.actions.MappingAction;
import org.onosproject.mapping.actions.MappingActions;
import org.onosproject.mapping.actions.NoMappingAction;
import org.onosproject.mapping.actions.DropMappingAction;
import org.onosproject.mapping.actions.ForwardMappingAction;
import org.onosproject.mapping.actions.NativeForwardMappingAction;
import org.onosproject.mapping.web.MappingCodecRegistrator;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.notNullValue;
import static org.onosproject.mapping.web.codec.MappingActionJsonMatcher.matchesAction;

/**
 * Unit tests for MappingActionCodec.
 */
public class MappingActionCodecTest {

    private CodecContext context;
    private JsonCodec<MappingAction> actionCodec;
    private MappingCodecRegistrator registrator;

    /**
     * Sets up for each test.
     * Creates a context and fetches the mapping action codec.
     */
    @Before
    public void setUp() {
        CodecManager manager = new CodecManager();
        registrator = new MappingCodecRegistrator();
        registrator.codecService = manager;
        registrator.activate();

        context = new MappingActionCodecTest.MappingTestContext(registrator.codecService);
        actionCodec = context.codec(MappingAction.class);
        assertThat(actionCodec, notNullValue());
    }

    /**
     * Deactivates the codec registrator.
     */
    @After
    public void tearDown() {
        registrator.deactivate();
    }

    /**
     * Tests the encoding of no mapping action.
     */
    @Test
    public void noActionTest() {
        final NoMappingAction action = MappingActions.noAction();
        final ObjectNode actionJson = actionCodec.encode(action, context);
        assertThat(actionJson, matchesAction(action));
    }

    /**
     * Tests the encoding of drop mapping action.
     */
    @Test
    public void dropActionTest() {
        final DropMappingAction action = MappingActions.drop();
        final ObjectNode actionJson = actionCodec.encode(action, context);
        assertThat(actionJson, matchesAction(action));
    }

    /**
     * Tests the encoding of forward mapping action.
     */
    @Test
    public void forwardActionTest() {
        final ForwardMappingAction action = MappingActions.forward();
        final ObjectNode actionJson = actionCodec.encode(action, context);
        assertThat(actionJson, matchesAction(action));
    }

    /**
     * Tests the encoding of native forwarding mapping action.
     */
    @Test
    public void nativeForwardActionTest() {
        final NativeForwardMappingAction action = MappingActions.nativeForward();
        final ObjectNode actionJson = actionCodec.encode(action, context);
        assertThat(actionJson, matchesAction(action));
    }

    /**
     * Test mapping codec context.
     */
    private class MappingTestContext implements CodecContext {
        private final ObjectMapper mapper = new ObjectMapper();
        private final CodecService manager;

        /**
         * Constructs a new mock codec context.
         */
        public MappingTestContext(CodecService manager) {
            this.manager = manager;
        }

        @Override
        public ObjectMapper mapper() {
            return mapper;
        }

        @Override
        public <T> JsonCodec<T> codec(Class<T> entityClass) {
            return manager.getCodec(entityClass);
        }

        @Override
        public <T> T getService(Class<T> serviceClass) {
            return null;
        }
    }
}