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/*
 * Copyright © 2015 The Gravitee team (http://gravitee.io)
 *
 * 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.
 */
package io.gravitee.gateway.reactive.api.message;

import io.gravitee.common.util.ListUtils;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import lombok.AccessLevel;
import lombok.Getter;
import lombok.Setter;

public abstract class AbstractMessage implements Message {

    public static final String SOURCE_TIMESTAMP = "sourceTimestamp";

    protected final long timestamp;

    protected final long sourceTimestamp;

    protected final Map metadata;
    protected Map attributes;
    protected Map internalAttributes;

    protected AbstractMessage(
        long timestamp,
        long sourceTimestamp,
        Map metadata,
        Map attributes,
        Map internalAttributes
    ) {
        this.timestamp = timestamp != 0L ? timestamp : System.currentTimeMillis();
        this.sourceTimestamp = sourceTimestamp != 0L ? sourceTimestamp : this.timestamp;
        this.metadata = initMetadata(metadata, this.sourceTimestamp);
        this.attributes = attributes;
        this.internalAttributes = internalAttributes;
    }

    @Override
    public long timestamp() {
        return this.timestamp;
    }

    @Override
    public Map metadata() {
        return metadata;
    }

    @Override
    public  T attribute(String name) {
        return (T) getOrInitAttribute().get(name);
    }

    @Override
    public  List attributeAsList(String name) {
        return ListUtils.toList(getOrInitAttribute().get(name));
    }

    @Override
    public Message attribute(String name, Object value) {
        getOrInitAttribute().put(name, value);
        return this;
    }

    @Override
    public Message removeAttribute(String name) {
        getOrInitAttribute().remove(name);
        return this;
    }

    @Override
    public Set attributeNames() {
        return getOrInitAttribute().keySet();
    }

    @Override
    public  Map attributes() {
        return Collections.unmodifiableMap((Map) getOrInitAttribute());
    }

    @Override
    public  T internalAttribute(String name) {
        return (T) getOrInitInternalAttribute().get(name);
    }

    @Override
    public Message internalAttribute(String name, Object value) {
        getOrInitInternalAttribute().put(name, value);
        return this;
    }

    @Override
    public Message removeInternalAttribute(String name) {
        getOrInitInternalAttribute().remove(name);
        return this;
    }

    @Override
    public Set internalAttributeNames() {
        return getOrInitInternalAttribute().keySet();
    }

    @Override
    public  Map internalAttributes() {
        return Collections.unmodifiableMap((Map) getOrInitInternalAttribute());
    }

    private Map getOrInitAttribute() {
        if (this.attributes == null) {
            this.attributes = new HashMap<>();
        }
        return this.attributes;
    }

    private Map getOrInitInternalAttribute() {
        if (this.internalAttributes == null) {
            this.internalAttributes = new HashMap<>();
        }
        return this.internalAttributes;
    }

    protected static Map unmodifiableMetadata(final Map metadata) {
        if (metadata != null) {
            return Collections.unmodifiableMap(metadata);
        } else {
            return Map.of();
        }
    }

    private static Map initMetadata(Map metadata, long sourceTimestamp) {
        if (metadata == null) {
            metadata = new HashMap<>();
        }
        // Insert sourceTimestamp into metadata if not present
        if (!metadata.containsKey(SOURCE_TIMESTAMP)) {
            metadata.put(SOURCE_TIMESTAMP, sourceTimestamp);
        }
        return unmodifiableMetadata(metadata);
    }
}