/*

 * 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.

 *

 * 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.jpackage.test;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.util.Collections;

import java.util.HashMap;

import java.util.Map;

import java.util.Objects;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public final class CfgFile {

    public String getValue(String section, String key) {

        Objects.requireNonNull(section);

        Objects.requireNonNull(key);

        Map<String, String> entries = data.get(section);

        TKit.assertTrue(entries != null, String.format(

                "Check section [%s] is found in [%s] cfg file", section, id));

        String value = entries.get(key);

        TKit.assertNotNull(value, String.format(

                "Check key [%s] is found in [%s] section of [%s] cfg file", key,

                section, id));

        return value;

    }

    private CfgFile(Map<String, Map<String, String>> data, String id) {

        this.data = data;

        this.id = id;

    }

    public static CfgFile readFromFile(Path path) throws IOException {

        TKit.trace(String.format("Read [%s] jpackage cfg file", path));

        final Pattern sectionBeginRegex = Pattern.compile( "\\s*\\[([^]]*)\\]\\s*");

        final Pattern keyRegex = Pattern.compile( "\\s*([^=]*)=(.*)" );

        Map<String, Map<String, String>> result = new HashMap<>();

        String currentSectionName = null;

        Map<String, String> currentSection = new HashMap<>();

        for (String line : Files.readAllLines(path)) {

            Matcher matcher = sectionBeginRegex.matcher(line);

            if (matcher.find()) {

                if (currentSectionName != null) {

                    result.put(currentSectionName, Collections.unmodifiableMap(

                            new HashMap<>(currentSection)));

                }

                currentSectionName = matcher.group(1);

                currentSection.clear();

                continue;

            }

            matcher = keyRegex.matcher(line);

            if (matcher.find()) {

                currentSection.put(matcher.group(1), matcher.group(2));

                continue;

            }

        }

        if (!currentSection.isEmpty()) {

            result.put("", Collections.unmodifiableMap(currentSection));

        }

        return new CfgFile(Collections.unmodifiableMap(result), path.toString());

    }

    private final Map<String, Map<String, String>> data;

    private final String id;

}