// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.application.preprocessor;

import com.yahoo.config.application.api.ApplicationPackage;
import com.yahoo.config.application.api.DeployLogger;
import com.yahoo.config.model.application.provider.BaseDeployLogger;
import com.yahoo.config.model.application.provider.FilesApplicationPackage;
import com.yahoo.config.provision.*;
import com.yahoo.yolean.Exceptions;
import org.xml.sax.SAXException;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerException;
import java.io.File;
import java.io.IOException;
import java.util.Optional;

/**
 * Main entry for preprocessing an application package.
 *
 * @author lulf
 * @since 5.25
 */
public class ApplicationPreprocessor {
    private final File applicationDir;
    private final Optional<File> outputDir;
    private final Optional<Environment> environment;
    private final Optional<RegionName> region;

    public ApplicationPreprocessor(File applicationDir, Optional<File> outputDir, Optional<Environment> environment, Optional<RegionName> region) {
        this.applicationDir = applicationDir;
        this.outputDir = outputDir;
        this.environment = environment;
        this.region = region;
    }

    public void run() throws IOException, TransformerException, ParserConfigurationException, SAXException {
        DeployLogger logger = new BaseDeployLogger();
        FilesApplicationPackage.Builder applicationPackageBuilder = new FilesApplicationPackage.Builder(applicationDir);
        outputDir.ifPresent(applicationPackageBuilder::preprocessedDir);
        ApplicationPackage preprocessed = applicationPackageBuilder.build().preprocess(
                new Zone(environment.orElse(Environment.defaultEnvironment()), region.orElse(RegionName.defaultName())),
                (a, b) -> {
                }, logger);
        preprocessed.validateXML(logger);
    }


    public static void main(String args[]) {
        int argCount = args.length;
        if (argCount < 1) {
            System.out.println("Usage: application-preprocessor <application> [environment] [region] [outputDirectory]");
            System.exit(1);
        }
        File applicationDir = new File(args[0]);
        Optional<Environment> environment = (argCount > 1) ? Optional.of(Environment.valueOf(args[1])) : Optional.empty();
        Optional<RegionName> region = (argCount > 2) ? Optional.of(RegionName.from(args[2])) : Optional.empty();
        Optional<File> outputDir = (argCount > 3) ? Optional.of(new File(args[3])) : Optional.empty();
        ApplicationPreprocessor preprocessor = new ApplicationPreprocessor(applicationDir, outputDir, environment, region);
        try {
            preprocessor.run();
            System.out.println("Application preprocessed successfully. Preprocessed application stored in " + new File(applicationDir, ".preprocessed").getAbsolutePath());
        } catch (Exception e) {
            System.err.println("Error validating application package: " + Exceptions.toMessageString(e));
            System.exit(1);
        }
    }
}