/*
 * Copyright (c) 2015, 2021, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 *
 *
 */

package jdk.jpackage.internal;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.module.Configuration;
import java.lang.module.ModuleDescriptor;
import java.lang.module.ModuleFinder;
import java.lang.module.ModuleReference;
import java.lang.module.ResolvedModule;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.Supplier;
import java.util.jar.JarFile;
import java.util.regex.Matcher;
import java.util.spi.ToolProvider;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import jdk.internal.module.ModulePath;


final class JLinkBundlerHelper {

    static void execute(Map<String, ? super Object> params, Path outputDir)
            throws IOException, PackagerException {

        List<Path> modulePath =
                StandardBundlerParam.MODULE_PATH.fetchFrom(params);
        Set<String> addModules =
                StandardBundlerParam.ADD_MODULES.fetchFrom(params);
        Set<String> limitModules =
                StandardBundlerParam.LIMIT_MODULES.fetchFrom(params);
        List<String> options =
                StandardBundlerParam.JLINK_OPTIONS.fetchFrom(params);

        LauncherData launcherData = StandardBundlerParam.LAUNCHER_DATA.fetchFrom(
                params);

        // Modules
        if (!launcherData.isModular() && addModules.isEmpty()) {
            addModules.add(ALL_DEFAULT);
        }

        Set<String> modules = createModuleList(modulePath, addModules, limitModules);

        if (launcherData.isModular()) {
            modules.add(launcherData.moduleName());
        }

        runJLink(outputDir, modulePath, modules, limitModules, options);
    }

    /*
     * Returns the set of modules that would be visible by default for
     * a non-modular-aware application consisting of the given elements.
     */
    private static Set<String> getDefaultModules(
            Collection<Path> paths, Collection<String> addModules) {

        // the modules in the run-time image that export an API
        Stream<String> systemRoots = ModuleFinder.ofSystem().findAll().stream()
                .map(ModuleReference::descriptor)
                .filter(JLinkBundlerHelper::exportsAPI)
                .map(ModuleDescriptor::name);

        Set<String> roots = Stream.concat(systemRoots,
                 addModules.stream()).collect(Collectors.toSet());

        ModuleFinder finder = createModuleFinder(paths);

        return Configuration.empty()
                .resolveAndBind(finder, ModuleFinder.of(), roots)
                .modules()
                .stream()
                .map(ResolvedModule::name)
                .collect(Collectors.toSet());
    }

    /*
     * Returns true if the given module exports an API to all module.
     */
    private static boolean exportsAPI(ModuleDescriptor descriptor) {
        return descriptor.exports()
                .stream()
                .anyMatch(e -> !e.isQualified());
    }

    static ModuleFinder createModuleFinder(Collection<Path> modulePath) {
        return ModuleFinder.compose(
                ModulePath.of(JarFile.runtimeVersion(), true,
                        modulePath.toArray(Path[]::new)),
                ModuleFinder.ofSystem());
    }

    private static Set<String> createModuleList(List<Path> paths,
            Set<String> addModules, Set<String> limitModules) {

        final Set<String> modules = new HashSet<>();

        final Map<String, Supplier<Collection<String>>> phonyModules = Map.of(
                ALL_MODULE_PATH,
                () -> createModuleFinder(paths)
                            .findAll()
                            .stream()
                            .map(ModuleReference::descriptor)
                            .map(ModuleDescriptor::name)
                            .collect(Collectors.toSet()),
                ALL_DEFAULT,
                () -> getDefaultModules(paths, modules));

        Supplier<Collection<String>> phonyModule = null;
        for (var module : addModules) {
            phonyModule = phonyModules.get(module);
            if (phonyModule == null) {
                modules.add(module);
            }
        }

        if (phonyModule != null) {
            modules.addAll(phonyModule.get());
        }

        return modules;
    }

    private static void runJLink(Path output, List<Path> modulePath,
            Set<String> modules, Set<String> limitModules,
            List<String> options)
            throws PackagerException, IOException {

        ArrayList<String> args = new ArrayList<String>();
        args.add("--output");
        args.add(output.toString());
        if (modulePath != null && !modulePath.isEmpty()) {
            args.add("--module-path");
            args.add(getPathList(modulePath));
        }
        if (modules != null && !modules.isEmpty()) {
            args.add("--add-modules");
            args.add(getStringList(modules));
        }
        if (limitModules != null && !limitModules.isEmpty()) {
            args.add("--limit-modules");
            args.add(getStringList(limitModules));
        }
        if (options != null) {
            for (String option : options) {
                if (option.startsWith("--output") ||
                        option.startsWith("--add-modules") ||
                        option.startsWith("--module-path")) {
                    throw new PackagerException("error.blocked.option", option);
                }
                args.add(option);
            }
        }

        StringWriter writer = new StringWriter();
        PrintWriter pw = new PrintWriter(writer);

        int retVal = LazyLoad.JLINK_TOOL.run(pw, pw, args.toArray(new String[0]));
        String jlinkOut = writer.toString();

        args.add(0, "jlink");
        Log.verbose(args, List.of(jlinkOut), retVal, -1);


        if (retVal != 0) {
            throw new PackagerException("error.jlink.failed" , jlinkOut);
        }
    }

    private static String getPathList(List<Path> pathList) {
        return pathList.stream()
                .map(Path::toString)
                .map(Matcher::quoteReplacement)
                .collect(Collectors.joining(File.pathSeparator));
    }

    private static String getStringList(Set<String> strings) {
        return Matcher.quoteReplacement(strings.stream().collect(
                Collectors.joining(",")));
    }

    // The token for "all modules on the module path".
    private static final String ALL_MODULE_PATH = "ALL-MODULE-PATH";

    // The token for "all valid runtime modules".
    private static final String ALL_DEFAULT = "ALL-DEFAULT";

    private static class LazyLoad {
        static final ToolProvider JLINK_TOOL = ToolProvider.findFirst(
                "jlink").orElseThrow();
    };
}
