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Eliminate tech-debt. Automatically.
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/*
 * Copyright 2023 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;

import lombok.EqualsAndHashCode;
import lombok.Value;
import org.openrewrite.marker.LstProvenance;
import org.openrewrite.table.LstProvenanceTable;

import static java.time.ZoneOffset.UTC;

@Value
@EqualsAndHashCode(callSuper = false)
public class FindLstProvenance extends ScanningRecipe {

    @Override
    public String getDisplayName() {
        return "Find LST provenance";
    }

    @Override
    public String getDescription() {
        return "Produces a data table showing what versions of OpenRewrite/Moderne tooling was used to produce a given LST.";
    }

    transient LstProvenanceTable provenanceTable = new LstProvenanceTable(this);

    public static class Accumulator {
        // There will only ever be one LstProvenance per repository, so after we have seen one we don't need to see more
        boolean foundLstProvenance;
    }

    @Override
    public Accumulator getInitialValue(ExecutionContext ctx) {
        return new Accumulator();
    }

    @Override
    public TreeVisitor getScanner(Accumulator acc) {
        return new TreeVisitor() {
            @Override
            public Tree preVisit(Tree tree, ExecutionContext ctx) {
                stopAfterPreVisit();
                if(acc.foundLstProvenance) {
                    return tree;
                }
                LstProvenance lstProvenance = tree.getMarkers().findFirst(LstProvenance.class).orElse(null);
                if (lstProvenance == null) {
                    return tree;
                }
                provenanceTable.insertRow(ctx, new LstProvenanceTable.Row(lstProvenance.getBuildToolType(),
                        lstProvenance.getBuildToolVersion(), lstProvenance.getLstSerializerVersion(),
                        lstProvenance.getTimestampUtc() == null ? null : lstProvenance.getTimestampUtc().toEpochMilli(),
                        lstProvenance.getTimestampUtc() == null ? null : lstProvenance.getTimestampUtc().atZone(UTC).toString()));
                acc.foundLstProvenance = true;
                return tree;
            }
        };
    }
}