/**************************************************************************
 OmegaT - Computer Assisted Translation (CAT) tool
          with fuzzy matching, translation memory, keyword search,
          glossaries, and translation leveraging into updated projects.

 Copyright (C) 2016 Aaron Madlon-Kay
               Home page: http://www.omegat.org/
               Support center: http://groups.yahoo.com/group/OmegaT/

 This file is part of OmegaT.

 OmegaT is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 OmegaT 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 for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 **************************************************************************/

package org.omegat.filters2.master;

import java.util.List;
import java.util.Objects;

import gen.core.filters.Files;
import gen.core.filters.Filter;
import gen.core.filters.Filter.Option;
import gen.core.filters.Filters;

/**
 * Utilities for {@link Filters} and associated objects
 *
 * @author Aaron Madlon-Kay
 */
public class FiltersUtil {

    private FiltersUtil() {
    }

    /**
     * An implementation of {@link Object#equals(Object)} for {@link Filters} objects, which are generated by
     * JAXB and thus don't have this method and shouldn't be manually modified. (It is apparently possible to
     * have this generated, but I didn't look too hard into it.).
     *
     * @return
     */
    public static boolean filtersEqual(Filters o1, Filters o2) {
        if (o1 == o2) {
            return true;
        }
        return o1.isIgnoreFileContext() == o2.isIgnoreFileContext()
                && o1.isPreserveSpaces() == o2.isPreserveSpaces()
                && o1.isRemoveSpacesNonseg() == o2.isRemoveSpacesNonseg()
                && o1.isRemoveTags() == o2.isRemoveTags()
                && filterListsEqual(o1.getFilters(), o2.getFilters());
    }

    private static boolean filterListsEqual(List<Filter> filters, List<Filter> filters2) {
        if (filters == filters2) {
            return true;
        }
        if (filters.size() != filters2.size()) {
            return false;
        }
        for (int i = 0; i < filters.size(); i++) {
            if (!filterObjsEqual(filters.get(i), filters2.get(i))) {
                return false;
            }
        }
        return true;
    }

    private static boolean filterObjsEqual(Filter filter, Filter filter2) {
        if (filter == filter2) {
            return true;
        }
        return filter.isEnabled() == filter2.isEnabled()
                && Objects.equals(filter.getClassName(), filter2.getClassName())
                && filesEqual(filter.getFiles(), filter2.getFiles())
                && optionsEqual(filter.getOption(), filter2.getOption());
    }

    private static boolean optionsEqual(List<Option> option, List<Option> option2) {
        if (option == option2) {
            return true;
        }
        if (option.size() != option2.size()) {
            return false;
        }
        for (int i = 0; i < option.size(); i++) {
            if (!optionObjsEqual(option.get(i), option2.get(i))) {
                return false;
            }
        }
        return true;
    }

    private static boolean optionObjsEqual(Option option, Option option2) {
        if (option == option2) {
            return true;
        }
        return Objects.equals(option.getName(), option2.getName())
                && Objects.equals(option.getValue(), option2.getValue());
    }

    private static boolean filesEqual(List<Files> files, List<Files> files2) {
        if (files == files2) {
            return true;
        }
        if (files.size() != files2.size()) {
            return false;
        }
        for (int i = 0; i < files.size(); i++) {
            if (!fileObjsEqual(files.get(i), files2.get(i))) {
                return false;
            }
        }
        return true;
    }

    private static boolean fileObjsEqual(Files files, Files files2) {
        if (files == files2) {
            return true;
        }
        return Objects.equals(files.getSourceEncoding(), files2.getSourceEncoding())
                && Objects.equals(files.getSourceFilenameMask(), files2.getSourceFilenameMask())
                && Objects.equals(files.getTargetEncoding(), files2.getTargetEncoding())
                && Objects.equals(files.getTargetFilenamePattern(), files2.getTargetFilenamePattern());
    }
}