/*
 * ===============================LICENSE_START======================================
 *  dcae-analytics
 * ================================================================================
 *    Copyright © 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 *  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.
 *  ============================LICENSE_END===========================================
 */

package org.onap.dcae.apod.analytics.dmaap.domain.config;

import com.google.common.base.Objects;
import org.onap.dcae.apod.analytics.common.AnalyticsConstants;

import java.util.UUID;

import javax.annotation.Nonnull;

/**
 * <p>
 *      Immutable DMaaP MR Configuration for Subscriber.
 * <p>
 *      Use {@link DMaaPMRSubscriberConfig.Builder} to construct Subscriber Configuration
 * <p>
 *
 * @author Rajiv Singla . Creation Date: 10/12/2016.
 */
public final class DMaaPMRSubscriberConfig extends DMaaPMRBaseConfig {

    private final String consumerId;
    private final String consumerGroup;
    private final Integer timeoutMS;
    private final Integer messageLimit;

    private DMaaPMRSubscriberConfig(@Nonnull String hostName,
                                    @Nonnull Integer portNumber,
                                    @Nonnull String topicName,
                                    @Nonnull String protocol,
                                    String userName,
                                    String userPassword,
                                    @Nonnull String contentType,
                                    @Nonnull String consumerId,
                                    @Nonnull String consumerGroup,
                                    @Nonnull Integer timeoutMS,
                                    @Nonnull Integer messageLimit) {
        this.hostName = hostName;
        this.portNumber = portNumber;
        this.topicName = topicName;
        this.protocol = protocol;
        this.userName = userName;
        this.userPassword = userPassword;
        this.contentType = contentType;
        this.consumerId = consumerId;
        this.consumerGroup = consumerGroup;
        this.timeoutMS = timeoutMS;
        this.messageLimit = messageLimit;
    }

    /**
     * Builder to initialize immutable {@link DMaaPMRSubscriberConfig} object
     */
    public static class Builder {

        private String hostName;
        private Integer portNumber;
        private String topicName;
        private String userName;
        private String userPassword;
        private String protocol;
        private String contentType;
        private String consumerId;
        private String consumerGroup;
        private Integer timeoutMS;
        private Integer messageLimit;

        public Builder(@Nonnull String hostName,
                       @Nonnull String topicName) {
            // Required Values
            this.hostName = hostName;
            this.topicName = topicName;

            // Default values
            this.portNumber = AnalyticsConstants.DEFAULT_PORT_NUMBER;
            this.userName = AnalyticsConstants.DEFAULT_USER_NAME;
            this.userPassword = AnalyticsConstants.DEFAULT_USER_PASSWORD;
            this.protocol = AnalyticsConstants.DEFAULT_PROTOCOL;
            this.contentType = AnalyticsConstants.DEFAULT_CONTENT_TYPE;
            this.consumerId = UUID.randomUUID().toString(); // consumer is assigned a random id by default
            this.consumerGroup = AnalyticsConstants.DEFAULT_SUBSCRIBER_GROUP_PREFIX + consumerId; // random group
            this.timeoutMS = AnalyticsConstants.DEFAULT_SUBSCRIBER_TIMEOUT_MS; // defaults to 10ms timeout
            this.messageLimit = AnalyticsConstants.DEFAULT_SUBSCRIBER_MESSAGE_LIMIT; // defaults to 1000 message limit
        }


        /**
         * Setup for custom host port number - Defaults to 80.
         *
         * @param portNumber custom port number
         * @return Builder object itself for chaining
         */
        public Builder setPortNumber(@Nonnull Integer portNumber) {
            this.portNumber = portNumber;
            return this;
        }


        /**
         * Setup user name for authentication. If no username is provided authentication will be disabled
         *
         * @param userName user name for DMaaP Topic Authentication
         * @return Builder object itself for chaining
         */
        public Builder setUserName(@Nonnull String userName) {
            this.userName = userName;
            return this;
        }


        /**
         * Setup user password for authentication. If no password is provided authentication will be disabled
         *
         * @param userPassword user password for DMaaP Topic Authentication
         * @return Builder object itself for chaining
         */
        public Builder setUserPassword(@Nonnull String userPassword) {
            this.userPassword = userPassword;
            return this;
        }


        /**
         * Setup custom Subscriber protocol - Defaults to https.
         * Note: Only http and https are currently supported.
         *
         * @param protocol protocol e.g. https or http
         * @return Builder object itself for chaining
         */
        public Builder setProtocol(@Nonnull String protocol) {

            this.protocol = normalizeValidateProtocol(protocol);
            return this;
        }

        /**
         * Setup custom Subscriber content-type - Defaults to application/json
         *
         * @param contentType content type e.g. application/json
         * @return Builder object itself for chaining
         */
        public Builder setContentType(@Nonnull String contentType) {
            final String normalizedContentType = normalizeValidateContentType(contentType);
            this.contentType = normalizedContentType;
            return this;
        }


        /**
         * Setup custom Consumer Id - Defaults to random Id
         *
         * @param consumerId - custom consumer ID
         * @return Builder object itself for chaining
         */
        public Builder setConsumerId(@Nonnull String consumerId) {
            this.consumerId = consumerId;
            return this;
        }

        /**
         * Setup custom Consumer Group - Default to OpenDCAE-DMaaPSub-ConsumerID
         *
         * @param consumerGroup - custom Consumer Group
         * @return Builder object itself for chaining
         */
        public Builder setConsumerGroup(@Nonnull String consumerGroup) {
            this.consumerGroup = consumerGroup;
            return this;
        }

        /**
         * Setup Custom Subscriber timeout in ms - Default to no timeout limit
         *
         * @param timeoutMS timeout in milliseconds
         * @return Builder object itself for chaining
         */
        public Builder setTimeoutMS(@Nonnull Integer timeoutMS) {
            this.timeoutMS = timeoutMS;
            return this;
        }

        /**
         * Setup custom Subscriber Message Limit - Default to no limit
         *
         * @param messageLimit message Limit
         * @return Builder object itself for chaining
         */
        public Builder setMessageLimit(@Nonnull Integer messageLimit) {
            this.messageLimit = messageLimit;
            return this;
        }

        /**
         * Builds Immutable instance of {@link DMaaPMRSubscriberConfig}
         *
         * @return immutable DMaaP Subscriber Config Object
         */
        public DMaaPMRSubscriberConfig build() {
            return new DMaaPMRSubscriberConfig(hostName, portNumber, topicName, protocol, userName, userPassword,
                    contentType, consumerId, consumerGroup, timeoutMS, messageLimit);
        }

    }


    /**
     * DMaaP MR Subscriber Consumer Id
     *
     * @return consumer Id
     */
    public String getConsumerId() {
        return consumerId;
    }

    /**
     * DMaaP MR Subscriber Consumer Group
     *
     * @return consumer group
     */
    public String getConsumerGroup() {
        return consumerGroup;
    }

    /**
     * DMaaP MR Subscriber Timeout in ms
     *
     * @return subscriber timeout ms
     */
    public Integer getTimeoutMS() {
        return timeoutMS;
    }

    /**
     * DMaaP MR Subscriber message limit
     *
     * @return subscriber message limit
     */
    public Integer getMessageLimit() {
        return messageLimit;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        if (!super.equals(o)) {
            return false;
        }
        DMaaPMRSubscriberConfig that = (DMaaPMRSubscriberConfig) o;
        return Objects.equal(consumerId, that.consumerId) &&
                Objects.equal(consumerGroup, that.consumerGroup) &&
                Objects.equal(timeoutMS, that.timeoutMS) &&
                Objects.equal(messageLimit, that.messageLimit);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(super.hashCode(), consumerId, consumerGroup, timeoutMS, messageLimit);
    }


    @Override
    public String toString() {
        return Objects.toStringHelper(this)
                .add("baseConfig", super.toString())
                .add("consumerId", consumerId)
                .add("consumerGroup", consumerGroup)
                .add("timeoutMS", timeoutMS)
                .add("messageLimit", messageLimit)
                .toString();
    }
}