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/*
 * DISCLAIMER
 *
 * Copyright 2016 ArangoDB GmbH, Cologne, Germany
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Copyright holder is ArangoDB GmbH, Cologne, Germany
 */

package com.arangodb.internal.cursor.entity;

import com.arangodb.entity.CursorWarning;
import com.arangodb.entity.MetaAware;
import com.arangodb.shaded.fasterxml.jackson.databind.JsonNode;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/**
 * @author Mark Vollmary
 * @see API
 * Documentation
 */
public final class InternalCursorEntity implements MetaAware {

    private final Extras extra = new Extras();
    private String id;
    private Integer count;
    private Boolean cached;
    private Boolean hasMore;
    private JsonNode result;

    private Map meta;

    public String getId() {
        return id;
    }

    /**
     * @return the total number of result documents available (only available if the query was executed with the count
     * attribute set)
     */
    public Integer getCount() {
        return count;
    }

    /**
     * @return an optional object with extra information about the query result contained in its stats sub-attribute.
     * For data-modification queries, the extra.stats sub-attribute will contain the number of modified
     * documents and the number of documents that could not be modified due to an error (if ignoreErrors query
     * option is specified)
     */
    public Extras getExtra() {
        return extra;
    }

    /**
     * @return a boolean flag indicating whether the query result was served from the query cache or not. If the query
     * result is served from the query cache, the extra return attribute will not contain any stats
     * sub-attribute and no profile sub-attribute.
     */
    public Boolean getCached() {
        return cached;
    }

    /**
     * @return A boolean indicator whether there are more results available for the cursor on the server
     */
    public Boolean getHasMore() {
        return hasMore;
    }

    /**
     * @return an array of result documents (might be empty if query has no results)
     */
    public JsonNode getResult() {
        return result;
    }

    @Override
    public Map getMeta() {
        if (meta == null) return Collections.emptyMap();
        return Collections.unmodifiableMap(meta);
    }

    @Override
    public void setMeta(Map meta) {
        this.meta = cleanupMeta(new HashMap<>(meta));
    }

    /**
     * @return remove not allowed (valid storable) meta information
     */
    public Map cleanupMeta(Map meta) {
        meta.remove("content-length");
        meta.remove("transfer-encoding");
        meta.remove("x-arango-queue-time-seconds");
        return meta;
    }

    public static final class Extras {
        private final Collection warnings = Collections.emptyList();
        private Map stats;

        public Map getStats() {
            return stats;
        }

        public Collection getWarnings() {
            return warnings;
        }

    }

}