/*
 *  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.codehaus.groovy.ast.ClassHelper
import org.codehaus.groovy.ast.builder.AstBuilder
import org.junit.jupiter.api.Test

import static org.objectweb.asm.Opcodes.ACC_PUBLIC

class ParameterMappingTest {

    TailRecursiveASTTransformation transformation = new TailRecursiveASTTransformation()

    @Test
    void emptyMethod() throws Exception {
        def myMethod = new AstBuilder().buildFromSpec {
            method('myMethod', ACC_PUBLIC, int.class) {
                parameters {}
                exceptions {}
                block {
                }
            }
        }[0]

        def nameAndTypeMapping = transformation.name2VariableMappingFor(myMethod)
        def positionMapping = transformation.position2VariableMappingFor(myMethod)

        assert nameAndTypeMapping == [:]
        assert positionMapping == [:]
    }

    @Test
    void oneParameter() throws Exception {
        def myMethod = new AstBuilder().buildFromSpec {
            method('myMethod', ACC_PUBLIC, int.class) {
                parameters { parameter 'one': int.class }
                exceptions {}
                block {
                }
            }
        }[0]

        def nameAndTypeMapping = transformation.name2VariableMappingFor(myMethod)
        def positionMapping = transformation.position2VariableMappingFor(myMethod)

        assert nameAndTypeMapping == [one: [name: '_one_', type: ClassHelper.int_TYPE]]
        assert positionMapping == [0: [name: '_one_', type: ClassHelper.int_TYPE]]
    }

    @Test
    void severalParameters() throws Exception {
        def myMethod = new AstBuilder().buildFromSpec {
            method('myMethod', ACC_PUBLIC, int.class) {
                parameters {
                    parameter 'one': int.class
                    parameter 'two': String.class
                    parameter 'three': Closure.class
                }
                exceptions {}
                block {
                }
            }
        }[0]

        def nameAndTypeMapping = transformation.name2VariableMappingFor(myMethod)
        def positionMapping = transformation.position2VariableMappingFor(myMethod)

        assert nameAndTypeMapping == [
                one: [name: '_one_', type: ClassHelper.int_TYPE],
                two: [name: '_two_', type: ClassHelper.STRING_TYPE],
                three: [name: '_three_', type: ClassHelper.CLOSURE_TYPE]
        ]
        assert positionMapping == [
                0: [name: '_one_', type: ClassHelper.int_TYPE],
                1: [name: '_two_', type: ClassHelper.STRING_TYPE],
                2: [name: '_three_', type: ClassHelper.CLOSURE_TYPE]
        ]
    }
}
