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Client library for working with the NATS messaging system.
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// Copyright 2023 The NATS Authors
// 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.nats.service;

import io.nats.client.support.JsonUtils;
import io.nats.client.support.JsonValue;

import java.time.ZonedDateTime;
import java.util.List;
import java.util.Objects;

import static io.nats.client.support.ApiConstants.ENDPOINTS;
import static io.nats.client.support.ApiConstants.STARTED;
import static io.nats.client.support.JsonValueUtils.readDate;
import static io.nats.client.support.JsonValueUtils.readValue;

/**
 * Stats response class forms the stats json payload, for example:
 * 
 * {
 * "id": "ZP1oVevzLGu4CBORMXKKke",
 * "name": "Service1",
 * "version": "0.0.1",
 * "endpoints": [{
 *     "name": "SortEndpointAscending",
 *     "subject": "sort.ascending",
 *     "num_requests": 1,
 *     "processing_time": 538900,
 *     "average_processing_time": 538900,
 *     "started": "2023-08-15T13:51:41.318000000Z"
 * }, {
 *     "name": "SortEndpointDescending",
 *     "subject": "sort.descending",
 *     "num_requests": 1,
 *     "processing_time": 88400,
 *     "average_processing_time": 88400,
 *     "started": "2023-08-15T13:51:41.318000000Z"
 * }, {
 *     "name": "EchoEndpoint",
 *     "subject": "echo",
 *     "num_requests": 5,
 *     "processing_time": 1931600,
 *     "average_processing_time": 386320,
 *     "data": {
 *          "idata": 2,
 *          "sdata": "s-996409223"
 *     },
 *     "started": "2023-08-15T13:51:41.318000000Z"
 * }],
 * "started": "2023-08-15T13:51:41.319000000Z",
 * "type": "io.nats.micro.v1.stats_response"
 * }
 * 
 */
public class StatsResponse extends ServiceResponse {
    public static final String TYPE = "io.nats.micro.v1.stats_response";

    private final ZonedDateTime started;
    private final List endpointStatsList;

    StatsResponse(ServiceResponse template, ZonedDateTime started, List endpointStatsList) {
        super(TYPE, template);
        this.started = started;
        this.endpointStatsList = endpointStatsList;
    }

    StatsResponse(byte[] jsonBytes) {
        this(parseMessage(jsonBytes));
    }

    private StatsResponse(JsonValue jv) {
        super(TYPE, jv);
        endpointStatsList = EndpointStats.listOf(readValue(jv, ENDPOINTS));
        started = readDate(jv, STARTED);
    }

    @Override
    protected void subToJson(StringBuilder sb) {
        JsonUtils.addJsons(sb, ENDPOINTS, endpointStatsList);
        JsonUtils.addField(sb, STARTED, started);
    }

    /**
     * Get the time the service was started
     * @return the start time
     */
    public ZonedDateTime getStarted() {
        return started;
    }

    /**
     * Get the list of {@link EndpointStats}
     * @return the list of endpoint stats
     */
    public List getEndpointStatsList() {
        return endpointStatsList;
    }

    @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;

        StatsResponse that = (StatsResponse) o;

        if (!Objects.equals(started, that.started)) return false;
        return Objects.equals(endpointStatsList, that.endpointStatsList);
    }

    @Override
    public int hashCode() {
        int result = super.hashCode();
        result = 31 * result + (started != null ? started.hashCode() : 0);
        result = 31 * result + (endpointStatsList != null ? endpointStatsList.hashCode() : 0);
        return result;
    }
}