/*
 * Copyright 2016 Federico Tomassetti
 *
 * 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 com.github.javaparser.symbolsolver.model.typesystem;

import com.github.javaparser.resolution.declarations.ResolvedTypeParameterDeclaration;
import com.github.javaparser.resolution.types.ResolvedArrayType;
import com.github.javaparser.resolution.types.ResolvedPrimitiveType;
import com.github.javaparser.resolution.types.ResolvedTypeVariable;
import com.github.javaparser.resolution.types.ResolvedVoidType;
import com.github.javaparser.symbolsolver.model.resolution.TypeSolver;
import com.github.javaparser.symbolsolver.reflectionmodel.ReflectionClassDeclaration;
import com.github.javaparser.symbolsolver.reflectionmodel.ReflectionInterfaceDeclaration;
import com.github.javaparser.symbolsolver.resolution.typesolvers.ReflectionTypeSolver;
import com.google.common.collect.ImmutableList;
import org.junit.Before;
import org.junit.Test;

import java.util.Collections;
import java.util.List;

import static org.junit.Assert.*;

public class NullTypeTest {

    private ResolvedArrayType arrayOfBooleans;
    private ResolvedArrayType arrayOfListOfA;
    private ReferenceTypeImpl OBJECT;
    private ReferenceTypeImpl STRING;
    private TypeSolver typeSolver;

    @Before
    public void setup() {
        typeSolver = new ReflectionTypeSolver();
        OBJECT = new ReferenceTypeImpl(new ReflectionClassDeclaration(Object.class, typeSolver), typeSolver);
        STRING = new ReferenceTypeImpl(new ReflectionClassDeclaration(String.class, typeSolver), typeSolver);
        arrayOfBooleans = new ResolvedArrayType(ResolvedPrimitiveType.BOOLEAN);
        arrayOfListOfA = new ResolvedArrayType(new ReferenceTypeImpl(
                new ReflectionInterfaceDeclaration(List.class, typeSolver),
                ImmutableList.of(new ResolvedTypeVariable(ResolvedTypeParameterDeclaration.onType("A", "foo.Bar", Collections.emptyList()))), typeSolver));
    }

    @Test
    public void testIsArray() {
        assertEquals(false, NullType.INSTANCE.isArray());
    }

    @Test
    public void testIsPrimitive() {
        assertEquals(false, NullType.INSTANCE.isPrimitive());
    }

    @Test
    public void testIsNull() {
        assertEquals(true, NullType.INSTANCE.isNull());
    }

    @Test
    public void testIsReference() {
        assertEquals(true, NullType.INSTANCE.isReference());
    }

    @Test
    public void testIsReferenceType() {
        assertEquals(false, NullType.INSTANCE.isReferenceType());
    }

    @Test
    public void testIsVoid() {
        assertEquals(false, NullType.INSTANCE.isVoid());
    }

    @Test
    public void testIsTypeVariable() {
        assertEquals(false, NullType.INSTANCE.isTypeVariable());
    }

    @Test(expected = UnsupportedOperationException.class)
    public void testAsReferenceTypeUsage() {
        NullType.INSTANCE.asReferenceType();
    }

    @Test(expected = UnsupportedOperationException.class)
    public void testAsTypeParameter() {
        NullType.INSTANCE.asTypeParameter();
    }

    @Test(expected = UnsupportedOperationException.class)
    public void testAsArrayTypeUsage() {
        NullType.INSTANCE.asArrayType();
    }

    @Test
    public void testAsDescribe() {
        assertEquals("null", NullType.INSTANCE.describe());
    }

    @Test
    public void testIsAssignableBy() {
        try {
            assertEquals(false, NullType.INSTANCE.isAssignableBy(NullType.INSTANCE));
            fail();
        } catch (UnsupportedOperationException e) {

        }
        try {
            assertEquals(false, NullType.INSTANCE.isAssignableBy(OBJECT));
            fail();
        } catch (UnsupportedOperationException e) {

        }
        try {
            assertEquals(false, NullType.INSTANCE.isAssignableBy(STRING));
            fail();
        } catch (UnsupportedOperationException e) {

        }
        try {
            assertEquals(false, NullType.INSTANCE.isAssignableBy(ResolvedPrimitiveType.BOOLEAN));
            fail();
        } catch (UnsupportedOperationException e) {

        }
        try {
            assertEquals(false, NullType.INSTANCE.isAssignableBy(ResolvedVoidType.INSTANCE));
            fail();
        } catch (UnsupportedOperationException e) {

        }
    }

}