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/*
 * Copyright 2024 the original author or authors.
 * 
 * Licensed 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
 * 

 * https://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.openrewrite.sql;

import lombok.EqualsAndHashCode;
import lombok.Value;
import net.sf.jsqlparser.expression.Function;
import org.openrewrite.*;
import org.openrewrite.internal.StringUtils;
import org.openrewrite.sql.internal.ChangeTrackingExpressionDeParser;
import org.openrewrite.sql.table.DatabaseFunctions;
import org.openrewrite.sql.table.DatabaseQueries;

import static org.openrewrite.sql.trait.Traits.sql;

@Value
@EqualsAndHashCode(callSuper = false)
public class ChangeFunctionName extends Recipe {
    transient DatabaseQueries databaseQueries = new DatabaseQueries(this);
    transient DatabaseFunctions databaseFunctions = new DatabaseFunctions(this);

    @Option(displayName = "Old function name",
            description = "The name of the function to find, case insensitive.",
            example = "NVL")
    String oldFunctionName;

    @Option(displayName = "New function name",
            description = "The new name to use. This will match the casing of " +
                          "the original method when a replacement is made.",
            example = "COALESCE")
    String newFunctionName;

    @Override
    public String getDisplayName() {
        return "Change a SQL function name";
    }

    @Override
    public String getDescription() {
        return "When migrating between dialects, often one name can be substituted for another. " +
               "For example, Oracle's NVL function can be replaced with Postgres COALESCE.";
    }

    @Override
    public TreeVisitor getVisitor() {
        return sql().asVisitor((sql, ctx) -> sql.visitSql(new ChangeTrackingExpressionDeParser() {
            @Override
            public void visit(Function function) {
                if (StringUtils.matchesGlob(function.getName(), oldFunctionName)) {
                    databaseQueries.insertRow(ctx, new DatabaseQueries.Row(
                            sql.getCursor().firstEnclosingOrThrow(SourceFile.class).getSourcePath().toString(),
                            sql.getString()
                    ));
                    databaseFunctions.insertRow(ctx, new DatabaseFunctions.Row(
                            sql.getCursor().firstEnclosingOrThrow(SourceFile.class).getSourcePath().toString(),
                            function.getName().toLowerCase(),
                            sql.getString()
                    ));
                    trackChange(() -> {
                        function.setName(newFunctionName);
                        super.visit(function);
                    });
                } else {
                    super.visit(function);
                }
            }
        }));
    }
}