/*******************************************************************************
 * Copyright (c) 2012-2016 Codenvy, S.A.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Codenvy, S.A. - initial API and implementation
 *******************************************************************************/
package org.everrest.core.impl.method;

import org.everrest.core.ApplicationContext;
import org.everrest.core.Parameter;
import org.everrest.core.method.TypeProducer;
import org.junit.Before;
import org.junit.Test;
import org.mockito.ArgumentMatcher;

import javax.ws.rs.MatrixParam;
import javax.ws.rs.core.MultivaluedHashMap;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.PathSegment;

import static com.google.common.collect.Lists.newArrayList;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.mockito.Matchers.any;
import static org.mockito.Matchers.argThat;
import static org.mockito.Matchers.eq;
import static org.mockito.Matchers.isNull;
import static org.mockito.Mockito.RETURNS_DEEP_STUBS;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

@SuppressWarnings("unchecked")
public class MatrixParameterResolverTest {
    private MultivaluedMap<String, String> matrixParameters;
    private ApplicationContext             applicationContext;
    private Parameter                      parameter;
    private TypeProducer                   typeProducer;

    private MatrixParameterResolver matrixParameterResolver;

    @Before
    public void setUp() throws Exception {
        matrixParameters = new MultivaluedHashMap<>();
        matrixParameters.putSingle("foo", "to be or not to be");
        matrixParameters.putSingle("bar", "hello world");

        PathSegment firstPathSegment = mock(PathSegment.class);
        PathSegment lastPathSegment = mock(PathSegment.class);
        when(lastPathSegment.getMatrixParameters()).thenReturn(matrixParameters);

        applicationContext = mock(ApplicationContext.class, RETURNS_DEEP_STUBS);
        when(applicationContext.getUriInfo().getPathSegments(true)).thenReturn(newArrayList(firstPathSegment, lastPathSegment));

        MatrixParam matrixParamAnnotation = mock(MatrixParam.class);
        when(matrixParamAnnotation.value()).thenReturn("foo");

        parameter = mock(Parameter.class);
        when(parameter.getParameterClass()).thenReturn((Class)String.class);

        typeProducer = mock(TypeProducer.class);
        TypeProducerFactory typeProducerFactory = mock(TypeProducerFactory.class);
        when(typeProducerFactory.createTypeProducer(eq(String.class), any())).thenReturn(typeProducer);

        matrixParameterResolver = new MatrixParameterResolver(matrixParamAnnotation, typeProducerFactory);
    }

    @Test
    public void retrievesMatrixParamValueFromLastPathSegment() throws Exception {
        when(typeProducer.createValue("foo", matrixParameters, null)).thenReturn(matrixParameters.getFirst("foo"));

        Object resolvedMatrixParameter = matrixParameterResolver.resolve(parameter, applicationContext);

        assertEquals(matrixParameters.getFirst("foo"), resolvedMatrixParameter);
    }

    @Test
    public void returnsNullWhenListOfPathSegmentsIsEmptyAndDefaultValueIsNull() throws Exception {
        when(applicationContext.getUriInfo().getPathSegments(true)).thenReturn(newArrayList());

        Object resolvedMatrixParameter = matrixParameterResolver.resolve(parameter, applicationContext);

        assertNull(resolvedMatrixParameter);
        verify(typeProducer).createValue(eq("foo"), emptyMultivaluedMap(), (String)isNull());
    }

    @Test
    public void returnsDefaultValueWhenListOfPathSegmentsIsEmpty() throws Exception {
        when(parameter.getDefaultValue()).thenReturn("default value");
        when(typeProducer.createValue(eq("foo"), emptyMultivaluedMap(), eq("default value"))).thenReturn("default value");
        when(applicationContext.getUriInfo().getPathSegments(true)).thenReturn(newArrayList());

        Object resolvedMatrixParameter = matrixParameterResolver.resolve(parameter, applicationContext);

        assertEquals("default value", resolvedMatrixParameter);
    }

    private MultivaluedMap emptyMultivaluedMap() {
        return argThat(new ArgumentMatcher<MultivaluedMap>() {
            @Override
            public boolean matches(Object argument) {
                return argument != null && ((MultivaluedMap)argument).isEmpty();
            }
        });
    }
}