/*

 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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package jdk.jpackage.internal;

import java.io.IOException;

import java.text.MessageFormat;

import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.atomic.AtomicBoolean;

import java.util.function.Function;

import java.util.stream.Stream;

public final class ToolValidator {

        args = new ArrayList<>();

        if (Platform.getPlatform() == Platform.LINUX) {

            setCommandLine("--version");

        }

    }

    ToolValidator setCommandLine(String... args) {

        this.args = List.of(args);

        return this;

    }

    ToolValidator setMinimalVersion(String v) {

        minimalVersion = v;

        return this;

    }

    ToolValidator setVersionParser(Function<Stream<String>, String> v) {

        versionParser = v;

        return this;

    }

    ConfigException validate() {

        List<String> cmdline = new ArrayList<>();

        cmdline.addAll(args);

        try {

            ProcessBuilder pb = new ProcessBuilder(cmdline);

            AtomicBoolean canUseTool = new AtomicBoolean();

            if (minimalVersion == null) {

                // No version check.

                canUseTool.setPlain(true);

            }

            Executor.of(pb).setOutputConsumer(lines -> {

                if (versionParser != null && minimalVersion != null) {

                        canUseTool.setPlain(true);

                    }

                }

            }).execute();

            if (!canUseTool.getPlain()) {

                return new ConfigException(MessageFormat.format(I18N.getString(

                        "error.tool-old-version"), name, minimalVersion),

                        MessageFormat.format(I18N.getString(

                                "error.tool-old-version.advice"), name,

                                minimalVersion));

            }

        } catch (IOException e) {

            return new ConfigException(MessageFormat.format(I18N.getString(

                    "error.tool-not-found"), name, e.getMessage()),

                    MessageFormat.format(I18N.getString(

                            "error.tool-not-found.advice"), name), e);

        }

        // All good. Tool can be used.

        return null;

    }

    private List<String> args;

    private String minimalVersion;

    private Function<Stream<String>, String> versionParser;

}