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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.graylog2.rest.models;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonValue;
import com.google.common.collect.ImmutableMap;
import org.graylog2.database.PaginatedList;

import javax.annotation.Nullable;
import java.util.ArrayList;
import java.util.Map;

@JsonAutoDetect
public class PaginatedResponse {
    private final String listKey;
    private final PaginatedList paginatedList;
    private final String query;
    private final Map context;

    private PaginatedResponse(String listKey, PaginatedList paginatedList, @Nullable String query, @Nullable Map context) {
        this.listKey = listKey;
        this.paginatedList = paginatedList;
        this.query = query;
        this.context = context;
    }

    @JsonValue
    public Map jsonValue() {
        final ImmutableMap.Builder builder = ImmutableMap.builder()
                .putAll(paginatedList.pagination().asMap())
                .put(listKey, new ArrayList<>(paginatedList));

        if (query != null) {
            builder.put("query", query);
        }

        if (paginatedList.grandTotal().isPresent()) {
            builder.put("grand_total", paginatedList.grandTotal().get());
        }

        if (context != null && !context.isEmpty()) {
            builder.put("context", context);
        }

        return builder.build();
    }

    public static  PaginatedResponse create(String listKey, PaginatedList paginatedList) {
        return new PaginatedResponse<>(listKey, paginatedList, null, null);
    }

    public static  PaginatedResponse create(String listKey, PaginatedList paginatedList, Map context) {
        return new PaginatedResponse<>(listKey, paginatedList, null, context);
    }

    public static  PaginatedResponse create(String listKey, PaginatedList paginatedList, String query) {
        return new PaginatedResponse<>(listKey, paginatedList, query, null);
    }

    public static  PaginatedResponse create(String listKey, PaginatedList paginatedList, String query, Map context) {
        return new PaginatedResponse<>(listKey, paginatedList, query, context);
    }
}