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/*************************************************************************
 *
 * ADOBE CONFIDENTIAL
 * ___________________
 *
 *   Copyright 2016 Adobe Systems Incorporated
 *   All Rights Reserved.
 *
 * NOTICE:  All information contained herein is, and remains
 * the property of Adobe Systems Incorporated and its suppliers,
 * if any.  The intellectual and technical concepts contained
 * herein are proprietary to Adobe Systems Incorporated and its
 * suppliers and are protected by trade secret or copyright law.
 * Dissemination of this information or reproduction of this material
 * is strictly forbidden unless prior written permission is obtained
 * from Adobe Systems Incorporated.
 **************************************************************************/
package org.apache.sling.settings.impl;


import com.google.common.base.Optional;
import org.apache.sling.settings.impl.RunModes.Group;
import org.apache.sling.settings.impl.SlingSettingsServiceImpl.Options;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;

/**
 * Reads a sling.options.file that is expected ot be a serialized java object.
 */
public class SlingOptionsFileReader {

    private static final Logger LOGGER = LoggerFactory.getLogger(SlingOptionsFileReader.class);
    /**
     * Read the sling.options.file
     * @param file the file that is sling.options.file
     * @return the result of read operation on that file
     */
    public SlingOptionsReadResult readOptions(File file) {
        List optionsList = null;
        if ( file.exists() ) {
            FileInputStream fis = null;
            ObjectInputStream ois = null;
            try {
                fis = new FileInputStream(file);
                ois = new ObjectInputStream(fis);

                final Object object = ois.readObject();
                optionsList = (object instanceof List) ? (List) object : null;
            } catch (final IOException ioe) {
                LOGGER.error("Unable to read from options data file.", ioe);
                return new SlingOptionsReadResult();
            } catch (final ClassNotFoundException cnfe) {
                LOGGER.error("Unable to read from options data file.", cnfe);
                return new SlingOptionsReadResult();
            } finally {
                if ( ois != null ) {
                    try { ois.close(); } catch ( final IOException ignore) {}
                }
                if ( fis != null ) {
                    try { fis.close(); } catch ( final IOException ignore) {}
                }
            }
        }
        final Optional> options = convertToOptionsList(optionsList);
        return options.isPresent()
                ? new SlingOptionsReadResult(getSlingRunModes(options.get()))
                : new SlingOptionsReadResult();
    }

    private RunModes getSlingRunModes(final List list) {
        Collection groups = new ArrayList<>();
        for (final Options options : list) {
            groups.add(getRunModeGroup(options));
        }
        return new RunModes(groups);
    }

    private Group getRunModeGroup(final Options options) {
        return options.selected == null
                ? new Group(Arrays.asList(options.modes))
                : new Group(Arrays.asList(options.modes), options.selected);
    }

    private Optional> convertToOptionsList(final List aList) {
        return aList != null ? convertToOptionsListNotNull(aList) : Optional.>absent();
    }

    private Optional> convertToOptionsListNotNull(final List aList) {
        final List optionsList = new ArrayList<>();
        for (Object object : aList) {
            if (object instanceof Options) {
                optionsList.add((Options) object);
            } else {
                return Optional.absent();
            }
        }
        return Optional.of(optionsList);
    }
}