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/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.codehaus.groovy.transform.tailrec;

import org.apache.groovy.util.Maps;
import org.codehaus.groovy.ast.CodeVisitorSupport;
import org.codehaus.groovy.ast.MethodNode;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.expr.MethodCallExpression;
import org.codehaus.groovy.ast.expr.StaticMethodCallExpression;

/**
 * Check if there are any recursive calls in a method
 */
public class HasRecursiveCalls extends CodeVisitorSupport {
    private MethodNode method;
    private boolean hasRecursiveCalls = false;

    @Override
    public void visitMethodCallExpression(MethodCallExpression call) {
        if (isRecursive(call)) {
            hasRecursiveCalls = true;
        } else {
            super.visitMethodCallExpression(call);
        }
    }

    @Override
    public void visitStaticMethodCallExpression(StaticMethodCallExpression call) {
        if (isRecursive(call)) {
            hasRecursiveCalls = true;
        } else {
            super.visitStaticMethodCallExpression(call);
        }
    }

    public synchronized boolean test(MethodNode method) {
        hasRecursiveCalls = false;
        this.method = method;
        this.method.getCode().visit(this);
        return hasRecursiveCalls;
    }

    private boolean isRecursive(Expression call) {
        return new RecursivenessTester().isRecursive(Maps.of("method", method, "call", call));
    }
}