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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program 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
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog.plugins.views;

import com.google.common.collect.ForwardingMap;
import com.google.inject.assistedinject.Assisted;
import org.graylog.plugins.views.search.views.PluginMetadataSummary;

import javax.inject.Inject;
import java.util.Map;
import java.util.Set;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class Requirements extends ForwardingMap {
    private final Map requirements;
    private final O dto;

    @Inject
    public Requirements(Set> requirements, @Assisted O dto) {
        this.dto = dto;
        this.requirements = requirements.stream()
                .map(requirement -> requirement.test(dto))
                .flatMap(s -> s.entrySet().stream())
                .collect(Collectors.toMap(Entry::getKey, Entry::getValue, (entry1, entry2) -> entry1));
    }

    @Override
    protected Map delegate() {
        return this.requirements;
    }

    public O rebuildRequirements(Function> getter,
                                 BiFunction, O> setter) {
        final Map requirements = Stream.concat(
                getter.apply(dto).entrySet().stream(),
                this.entrySet().stream()
        )
                .collect(Collectors.toMap(Entry::getKey, Entry::getValue, (entry1, entry2) -> entry1));
        return setter.apply(dto, requirements);

    }

    public interface Factory {
        Requirements create(O dto);
    }
}