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Utility classes for Jetty
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//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//

package org.eclipse.jetty.util.ssl;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;

import org.eclipse.jetty.util.component.Dumpable;

class SslSelectionDump implements Dumpable
{
    static class CaptionedList extends ArrayList implements Dumpable
    {
        private final String caption;

        public CaptionedList(String caption)
        {
            this.caption = caption;
        }

        @Override
        public String dump()
        {
            return Dumpable.dump(SslSelectionDump.CaptionedList.this);
        }

        @Override
        public void dump(Appendable out, String indent) throws IOException
        {
            Object[] array = toArray();
            Dumpable.dumpObjects(out, indent, caption + " size=" + array.length, array);
        }
    }

    final String type;
    final SslSelectionDump.CaptionedList enabled = new SslSelectionDump.CaptionedList("Enabled");
    final SslSelectionDump.CaptionedList disabled = new SslSelectionDump.CaptionedList("Disabled");

    public SslSelectionDump(String type,
                            String[] supportedByJVM,
                            String[] enabledByJVM,
                            String[] excludedByConfig,
                            String[] includedByConfig)
    {
        this.type = type;

        List jvmEnabled = Arrays.asList(enabledByJVM);
        List excludedPatterns = Arrays.stream(excludedByConfig)
            .map((entry) -> Pattern.compile(entry))
            .collect(Collectors.toList());
        List includedPatterns = Arrays.stream(includedByConfig)
            .map((entry) -> Pattern.compile(entry))
            .collect(Collectors.toList());

        Arrays.stream(supportedByJVM)
            .sorted(Comparator.naturalOrder())
            .forEach((entry) ->
            {
                boolean isPresent = true;

                StringBuilder s = new StringBuilder();
                s.append(entry);

                for (Pattern pattern : excludedPatterns)
                {
                    Matcher m = pattern.matcher(entry);
                    if (m.matches())
                    {
                        if (isPresent)
                        {
                            s.append(" -");
                            isPresent = false;
                        }
                        else
                        {
                            s.append(",");
                        }
                        s.append(" ConfigExcluded:'").append(pattern.pattern()).append('\'');
                    }
                }

                boolean isIncluded = false;

                if (!includedPatterns.isEmpty())
                {
                    for (Pattern pattern : includedPatterns)
                    {
                        Matcher m = pattern.matcher(entry);
                        if (m.matches())
                        {
                            isIncluded = true;
                            break;
                        }
                    }

                    if (!isIncluded)
                    {
                        if (isPresent)
                        {
                            s.append(" -");
                            isPresent = false;
                        }
                        else
                        {
                            s.append(",");
                        }

                        s.append(" ConfigIncluded:NotSelected");
                    }
                }

                if (!isIncluded && !jvmEnabled.contains(entry))
                {
                    if (isPresent)
                    {
                        s.append(" -");
                        isPresent = false;
                    }

                    s.append(" JVM:disabled");
                }

                if (isPresent)
                {
                    enabled.add(s.toString());
                }
                else
                {
                    disabled.add(s.toString());
                }
            });
    }

    @Override
    public String dump()
    {
        return Dumpable.dump(this);
    }

    @Override
    public void dump(Appendable out, String indent) throws IOException
    {
        Dumpable.dumpObjects(out, indent, this, enabled, disabled);
    }

    @Override
    public String toString()
    {
        return String.format("%s Selections", type);
    }
}