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/*
 * Copyright (c) 2018, 2018, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.svm.hosted.config;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
import java.util.List;
import java.util.Map;

import com.oracle.svm.core.option.HostedOptionKey;
import com.oracle.svm.core.option.OptionUtils;
import com.oracle.svm.core.util.UserError;
import com.oracle.svm.hosted.ImageClassLoader;
import com.oracle.svm.hosted.json.JSONParserException;

public abstract class ConfigurationParser {

    protected final ImageClassLoader classLoader;

    ConfigurationParser(ImageClassLoader classLoader) {
        this.classLoader = classLoader;
    }

    /**
     * Parses configurations in files specified by {@code configFilesOption} and resources specified
     * by {@code configResourcesOption} and registers the parsed elements using
     * {@link #parseAndRegister(Reader, String, Object, HostedOptionKey)} .
     *
     * @param featureName name of the feature using the configuration (e.g., "JNI")
     */
    public void parseAndRegisterConfigurations(String featureName, HostedOptionKey configFilesOption, HostedOptionKey configResourcesOption) {
        for (String path : OptionUtils.flatten(",", configFilesOption.getValue())) {
            File file = new File(path).getAbsoluteFile();
            if (!file.exists()) {
                throw UserError.abort("The " + featureName + " configuration file \"" + file + "\" does not exist.");
            }
            try (Reader reader = new FileReader(file)) {
                parseAndRegister(reader, featureName, file, configFilesOption);
            } catch (IOException e) {
                throw UserError.abort("Could not open " + file + ": " + e.getMessage());
            }
        }
        for (String resource : OptionUtils.flatten(",", configResourcesOption.getValue())) {
            URL url = classLoader.findResourceByName(resource);
            if (url == null) {
                throw UserError.abort("Could not find " + featureName + " configuration resource \"" + resource + "\".");
            }
            try (Reader reader = new InputStreamReader(url.openStream())) {
                parseAndRegister(reader, featureName, url, configResourcesOption);
            } catch (IOException e) {
                throw UserError.abort("Could not open " + url + ": " + e.getMessage());
            }
        }
    }

    protected abstract void parseAndRegister(Reader reader, String featureName, Object location, HostedOptionKey configFilesOption);

    @SuppressWarnings("unchecked")
    static List