/*
 * 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.apache.dubbo.aot.generate;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.nio.file.Path;
import java.util.function.Consumer;

/**
 * Write Write configuration metadata information in
 * {@link ResourceConfigMetadataRepository} and {@link ReflectConfigMetadataRepository}
 * as GraalVM native configuration.
 * @see <a href="https://www.graalvm.org/latest/reference-manual/native-image/overview/BuildConfiguration/">Native Image Build Configuration</a>
 */
public class NativeConfigurationWriter {

    private final Path basePath;

    private final String groupId;

    private final String artifactId;

    public NativeConfigurationWriter(Path basePath, String groupId, String artifactId) {
        this.basePath = basePath;
        this.groupId = groupId;
        this.artifactId = artifactId;
    }

    protected void writeTo(String fileName, Consumer<BasicJsonWriter> writer) {
        try {
            File file = createIfNecessary(fileName);
            try (FileWriter out = new FileWriter(file)) {
                writer.accept(createJsonWriter(out));
            }
        } catch (IOException ex) {
            throw new IllegalStateException("Failed to write native configuration for " + fileName, ex);
        }
    }

    private File createIfNecessary(String filename) throws IOException {
        Path outputDirectory = this.basePath.resolve("META-INF").resolve("native-image");
        if (this.groupId != null && this.artifactId != null) {
            outputDirectory = outputDirectory.resolve(this.groupId).resolve(this.artifactId);
        }
        outputDirectory.toFile().mkdirs();
        File file = outputDirectory.resolve(filename).toFile();
        file.createNewFile();
        return file;
    }

    public void writeReflectionConfig(ReflectConfigMetadataRepository repository) {
        writeTo("reflect-config.json", writer -> ReflectionConfigWriter.INSTANCE.write(writer, repository));
    }

    public void writeResourceConfig(ResourceConfigMetadataRepository repository) {
        writeTo("resource-config.json", writer -> ResourceConfigWriter.INSTANCE.write(writer, repository));
    }

    private BasicJsonWriter createJsonWriter(Writer out) {
        return new BasicJsonWriter(out);
    }
}
