/*
 * Copyright (c) 2020 PANTHEON.tech, s.r.o. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.yangtools.yang2sources.plugin;

import static java.util.Objects.requireNonNull;

import com.google.common.base.Stopwatch;
import java.io.File;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import org.eclipse.jdt.annotation.NonNullByDefault;
import org.opendaylight.yangtools.yang2sources.spi.BasicCodeGenerator;
import org.opendaylight.yangtools.yang2sources.spi.BuildContextAware;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.sonatype.plexus.build.incremental.BuildContext;

@NonNullByDefault
final class CodeGeneratorTask extends GeneratorTask<CodeGeneratorTaskFactory> {
    private static final Logger LOG = LoggerFactory.getLogger(CodeGeneratorTask.class);

    private final File outputDir;

    CodeGeneratorTask(final CodeGeneratorTaskFactory factory, final ContextHolder context, final File outputDir) {
        super(factory, context);
        this.outputDir = requireNonNull(outputDir);
    }

    @Override
    Collection<File> execute(final CodeGeneratorTaskFactory factory, final ContextHolder modelContext,
            final BuildContext buildContext) throws IOException {
        final Stopwatch watch = Stopwatch.createStarted();
        final BasicCodeGenerator gen = factory.generator();
        final boolean mark;
        if (gen instanceof BuildContextAware) {
            ((BuildContextAware)gen).setBuildContext(buildContext);
            mark = false;
        } else {
            mark = true;
        }

        LOG.debug("Sources will be generated to {}", outputDir);
        Collection<File> sources = gen.generateSources(modelContext.getContext(), outputDir,
            modelContext.getYangModules(), modelContext);
        if (sources == null) {
            sources = List.of();
        }

        LOG.debug("Sources generated by {}: {}", gen.getClass(), sources);
        LOG.info("Sources generated by {}: {} in {}", gen.getClass(), sources.size(), watch);

        if (mark) {
            sources.forEach(buildContext::refresh);
        }

        return sources;
    }
}