/*
 * Copyright (C) 2007-2010 Júlio Vilmar Gesser.
 * Copyright (C) 2011, 2013-2024 The JavaParser Team.
 *
 * This file is part of JavaParser.
 *
 * JavaParser can be used either under the terms of
 * a) the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * b) the terms of the Apache License
 *
 * You should have received a copy of both licenses in LICENCE.LGPL and
 * LICENCE.APACHE. Please refer to those files for details.
 *
 * JavaParser 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.
 */

package com.github.javaparser.ast;

import static org.junit.jupiter.api.Assertions.*;

import com.github.javaparser.*;
import com.github.javaparser.ast.expr.Expression;
import com.github.javaparser.ast.expr.VariableDeclarationExpr;
import java.io.IOException;
import org.junit.jupiter.api.Test;

public class AncestorDescendantTests {

    @Test
    void nodeIsNotAncestorOfItself() throws IOException {
        JavaParser parser = new JavaParser();

        Provider provider = Providers.resourceProvider("com/github/javaparser/range/A.java");
        assertNotNull(provider);
        ParseResult<CompilationUnit> parse = parser.parse(ParseStart.COMPILATION_UNIT, provider);
        assertTrue(parse.isSuccessful());

        VariableDeclarationExpr node = parse.getResult()
                .get()
                .getType(0) // class A
                .getMember(0)
                .asMethodDeclaration() // method foo()
                .getBody()
                .get()
                .getStatement(0)
                .asExpressionStmt() // int a = 42;
                .getExpression()
                .asVariableDeclarationExpr(); // a = 42

        assertFalse(node.isAncestorOf(node));
    }

    @Test
    void nodeIsNotDescendantOfItself() throws IOException {
        JavaParser parser = new JavaParser();

        Provider provider = Providers.resourceProvider("com/github/javaparser/range/A.java");
        assertNotNull(provider);
        ParseResult<CompilationUnit> parse = parser.parse(ParseStart.COMPILATION_UNIT, provider);
        assertTrue(parse.isSuccessful());

        VariableDeclarationExpr node = parse.getResult()
                .get()
                .getType(0) // class A
                .getMember(0)
                .asMethodDeclaration() // method foo()
                .getBody()
                .get()
                .getStatement(0)
                .asExpressionStmt() // int a = 42;
                .getExpression()
                .asVariableDeclarationExpr(); // a = 42

        assertFalse(node.isDescendantOf(node));
    }

    @Test
    void nodeInSameFileIsDescendantOfAncestor() throws IOException {
        JavaParser parser = new JavaParser();

        Provider provider = Providers.resourceProvider("com/github/javaparser/range/A.java");
        assertNotNull(provider);
        ParseResult<CompilationUnit> parse = parser.parse(ParseStart.COMPILATION_UNIT, provider);
        assertTrue(parse.isSuccessful());

        VariableDeclarationExpr superNode = parse.getResult()
                .get()
                .getType(0) // class A
                .getMember(0)
                .asMethodDeclaration() // method foo()
                .getBody()
                .get()
                .getStatement(0)
                .asExpressionStmt() // int a = 42;
                .getExpression()
                .asVariableDeclarationExpr(); // a = 42

        Expression subNode = superNode.getVariable(0).getInitializer().get(); // 42

        assertTrue(superNode.isAncestorOf(subNode));
        assertFalse(subNode.isAncestorOf(superNode));
        assertTrue(subNode.isDescendantOf(superNode));
        assertFalse(superNode.isDescendantOf(subNode));
    }

    @Test
    void nodesInTwoDifferentFilesAreNotDescendantOrAncestorOfEachOther() throws IOException {
        JavaParser parser = new JavaParser();

        Provider providerA = Providers.resourceProvider("com/github/javaparser/range/A.java");
        assertNotNull(providerA);
        ParseResult<CompilationUnit> parseA = parser.parse(ParseStart.COMPILATION_UNIT, providerA);
        assertTrue(parseA.isSuccessful());

        Provider providerB = Providers.resourceProvider("com/github/javaparser/range/B.java");
        assertNotNull(providerB);
        ParseResult<CompilationUnit> parseB = parser.parse(ParseStart.COMPILATION_UNIT, providerB);
        assertTrue(parseB.isSuccessful());

        VariableDeclarationExpr superNodeA = parseA.getResult()
                .get()
                .getType(0) // class A
                .getMember(0)
                .asMethodDeclaration() // method foo()
                .getBody()
                .get()
                .getStatement(0)
                .asExpressionStmt() // int a = 42;
                .getExpression()
                .asVariableDeclarationExpr(); // a = 42

        Expression subNodeA = superNodeA.getVariable(0).getInitializer().get(); // 42

        VariableDeclarationExpr superNodeB = parseB.getResult()
                .get()
                .getType(0) // class B
                .getMember(0)
                .asMethodDeclaration() // method foo()
                .getBody()
                .get()
                .getStatement(0)
                .asExpressionStmt() // int b = 42;
                .getExpression()
                .asVariableDeclarationExpr(); // b = 42

        Expression subNodeB = superNodeB.getVariable(0).getInitializer().get(); // 42

        assertFalse(superNodeA.isAncestorOf(superNodeB));
        assertFalse(superNodeA.isDescendantOf(subNodeB));
        assertFalse(superNodeB.isAncestorOf(superNodeA));
        assertFalse(superNodeB.isDescendantOf(subNodeA));
    }
}
