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/**
 * Copyright (c) 2017, RTE (http://www.rte-france.com)
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 * SPDX-License-Identifier: MPL-2.0
 */
package com.powsybl.dsl;

import org.codehaus.groovy.ast.ClassCodeExpressionTransformer;
import org.codehaus.groovy.ast.expr.*;
import org.codehaus.groovy.control.SourceUnit;
import org.codehaus.groovy.transform.GroovyASTTransformation;

/**
 * @author Geoffroy Jamgotchian {@literal }
 */
@GroovyASTTransformation
public class PowsyblDslAstTransformation extends AbstractPowsyblDslAstTransformation {

    public PowsyblDslAstTransformation() {
        super(CustomClassCodeExpressionTransformer::new);
    }

    static class CustomClassCodeExpressionTransformer extends ClassCodeExpressionTransformer {
        SourceUnit sourceUnit;

        CustomClassCodeExpressionTransformer(SourceUnit sourceUnit) {
            this.sourceUnit = sourceUnit;
        }

        @Override
        protected SourceUnit getSourceUnit() {
            return sourceUnit;
        }

        @Override
        public Expression transform(Expression exp) {
            if (exp instanceof BinaryExpression binExpr) {
                String op = binExpr.getOperation().getText();
                switch (op) {
                    case ">", ">=", "<", "<=", "==", "!=" -> {
                        return new MethodCallExpression(transform(binExpr.getLeftExpression()),
                            "compareTo2",
                            new ArgumentListExpression(transform(binExpr.getRightExpression()), new ConstantExpression(op)));
                    }
                    case "&&" -> {
                        return new MethodCallExpression(transform(binExpr.getLeftExpression()),
                            "and2",
                            new ArgumentListExpression(transform(binExpr.getRightExpression())));
                    }
                    case "||" -> {
                        return new MethodCallExpression(transform(binExpr.getLeftExpression()),
                            "or2",
                            new ArgumentListExpression(transform(binExpr.getRightExpression())));
                    }
                    default -> {
                        // Do nothing
                    }
                }
            } else if (exp instanceof NotExpression notExpression) {
                return new MethodCallExpression(transform(notExpression.getExpression()),
                        "not",
                        new ArgumentListExpression());
            }

            // propagate visit inside transformed expression
            Expression newExpr = super.transform(exp);
            if (newExpr != null) {
                newExpr.visit(this);
            }

            return newExpr;
        }
    }
}