////////////////////////////////////////////////////////////////////////////////
// checkstyle: Checks Java source code for adherence to a set of rules.
// Copyright (C) 2001-2017 the original author or authors.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

package com.puppycrawl.tools.checkstyle.utils;

import static com.puppycrawl.tools.checkstyle.internal.TestUtils.assertUtilsClassHasPrivateConstructor;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

import org.junit.Assert;
import org.junit.Test;

import com.puppycrawl.tools.checkstyle.api.DetailAST;
import com.puppycrawl.tools.checkstyle.api.TokenTypes;

public class CheckUtilsTest {

    @Test
    public void testIsProperUtilsClass() throws ReflectiveOperationException {
        assertUtilsClassHasPrivateConstructor(CheckUtils.class);
    }

    @Test
    public void testParseDoubleWithIncorrectToken() {
        final double parsedDouble = CheckUtils.parseDouble("1_02", TokenTypes.ASSIGN);
        assertEquals(0.0, parsedDouble, 0.0);
    }

    @Test
    public void testElseWithCurly() {
        final DetailAST ast = new DetailAST();
        ast.setType(TokenTypes.ASSIGN);
        ast.setText("ASSIGN");
        Assert.assertFalse(CheckUtils.isElseIf(ast));

        final DetailAST parentAst = new DetailAST();
        parentAst.setType(TokenTypes.LCURLY);
        parentAst.setText("LCURLY");

        final DetailAST ifAst = new DetailAST();
        ifAst.setType(TokenTypes.LITERAL_IF);
        ifAst.setText("IF");
        parentAst.addChild(ifAst);

        Assert.assertFalse(CheckUtils.isElseIf(ifAst));

        final DetailAST parentAst2 = new DetailAST();
        parentAst2.setType(TokenTypes.SLIST);
        parentAst2.setText("SLIST");

        parentAst2.addChild(ifAst);

        Assert.assertFalse(CheckUtils.isElseIf(ifAst));

        final DetailAST elseAst = new DetailAST();
        elseAst.setType(TokenTypes.LITERAL_ELSE);

        elseAst.setFirstChild(ifAst);
        Assert.assertTrue(CheckUtils.isElseIf(ifAst));
    }

    @Test
    public void testEquals() {
        final DetailAST litStatic = new DetailAST();
        litStatic.setType(TokenTypes.LITERAL_STATIC);

        final DetailAST modifiers = new DetailAST();
        modifiers.setType(TokenTypes.MODIFIERS);
        modifiers.addChild(litStatic);

        final DetailAST metDef = new DetailAST();
        metDef.setType(TokenTypes.METHOD_DEF);
        metDef.addChild(modifiers);

        Assert.assertFalse(CheckUtils.isEqualsMethod(metDef));

        metDef.removeChildren();

        final DetailAST metName = new DetailAST();
        metName.setType(TokenTypes.IDENT);
        metName.setText("equals");
        metDef.addChild(metName);

        final DetailAST modifiers2 = new DetailAST();
        modifiers2.setType(TokenTypes.MODIFIERS);
        metDef.addChild(modifiers2);

        final DetailAST parameter1 = new DetailAST();
        final DetailAST parameter2 = new DetailAST();

        final DetailAST parameters = new DetailAST();
        parameters.setType(TokenTypes.PARAMETERS);

        parameters.addChild(parameter2);

        parameters.addChild(parameter1);
        metDef.addChild(parameters);

        Assert.assertFalse(CheckUtils.isEqualsMethod(metDef));
    }

    @Test
    public void testGetAccessModifierFromModifiersTokenWrongTokenType() {
        final DetailAST modifiers = new DetailAST();
        modifiers.setType(TokenTypes.METHOD_DEF);

        try {
            CheckUtils.getAccessModifierFromModifiersToken(modifiers);
            fail(IllegalArgumentException.class.getSimpleName() + " was expected.");
        }
        catch (IllegalArgumentException exc) {
            final String expectedExceptionMsg = "expected non-null AST-token with type 'MODIFIERS'";
            final String actualExceptionMsg = exc.getMessage();
            assertEquals(expectedExceptionMsg, actualExceptionMsg);
        }
    }

    @Test
    public void testGetAccessModifierFromModifiersTokenWithNullParameter() {
        try {
            CheckUtils.getAccessModifierFromModifiersToken(null);
            fail(IllegalArgumentException.class.getSimpleName() + " was expected.");
        }
        catch (IllegalArgumentException exc) {
            final String expectedExceptionMsg = "expected non-null AST-token with type 'MODIFIERS'";
            final String actualExceptionMsg = exc.getMessage();
            assertEquals(expectedExceptionMsg, actualExceptionMsg);
        }
    }
}