/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.kafka.common.requests;

import io.opentelemetry.proto.metrics.v1.Metric;
import io.opentelemetry.proto.metrics.v1.MetricsData;
import io.opentelemetry.proto.metrics.v1.ResourceMetrics;
import io.opentelemetry.proto.metrics.v1.ScopeMetrics;
import io.opentelemetry.proto.resource.v1.Resource;

import org.apache.kafka.common.message.PushTelemetryRequestData;
import org.apache.kafka.common.protocol.Errors;
import org.apache.kafka.common.record.CompressionType;
import org.apache.kafka.common.telemetry.internals.ClientTelemetryUtils;
import org.apache.kafka.common.telemetry.internals.MetricKey;
import org.apache.kafka.common.telemetry.internals.SinglePointMetric;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.EnumSource;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;

public class PushTelemetryRequestTest {

    @Test
    public void testGetErrorResponse() {
        PushTelemetryRequest req = new PushTelemetryRequest(new PushTelemetryRequestData(), (short) 0);
        PushTelemetryResponse response = req.getErrorResponse(0, Errors.CLUSTER_AUTHORIZATION_FAILED.exception());
        assertEquals(Collections.singletonMap(Errors.CLUSTER_AUTHORIZATION_FAILED, 1), response.errorCounts());
    }

    @ParameterizedTest
    @EnumSource(CompressionType.class)
    public void testMetricsDataCompression(CompressionType compressionType) throws IOException {
        MetricsData metricsData = getMetricsData();
        PushTelemetryRequest req = getPushTelemetryRequest(metricsData, compressionType);

        ByteBuffer receivedMetricsBuffer = req.metricsData();
        assertNotNull(receivedMetricsBuffer);
        assertTrue(receivedMetricsBuffer.capacity() > 0);

        MetricsData receivedData = ClientTelemetryUtils.deserializeMetricsData(receivedMetricsBuffer);
        assertEquals(metricsData, receivedData);
    }

    private PushTelemetryRequest getPushTelemetryRequest(MetricsData metricsData, CompressionType compressionType) throws IOException {
        byte[] data = metricsData.toByteArray();
        byte[] compressedData = ClientTelemetryUtils.compress(data, compressionType);
        if (compressionType != CompressionType.NONE) {
            assertTrue(compressedData.length < data.length);
        } else {
            assertArrayEquals(compressedData, data);
        }

        return new PushTelemetryRequest.Builder(
            new PushTelemetryRequestData()
                .setMetrics(compressedData)
                .setCompressionType(compressionType.id)).build();
    }

    private MetricsData getMetricsData() {
        List<Metric> metricsList = new ArrayList<>();
        metricsList.add(SinglePointMetric.sum(
                new MetricKey("metricName"), 1.0, true, Instant.now(), null, Collections.emptySet())
            .builder().build());
        metricsList.add(SinglePointMetric.sum(
                new MetricKey("metricName1"), 100.0, false, Instant.now(),  Instant.now(), Collections.emptySet())
            .builder().build());
        metricsList.add(SinglePointMetric.deltaSum(
                new MetricKey("metricName2"), 1.0, true, Instant.now(), Instant.now(), Collections.emptySet())
            .builder().build());
        metricsList.add(SinglePointMetric.gauge(
                new MetricKey("metricName3"), 1.0, Instant.now(), Collections.emptySet())
            .builder().build());
        metricsList.add(SinglePointMetric.gauge(
                new MetricKey("metricName4"), Long.valueOf(100), Instant.now(), Collections.emptySet())
            .builder().build());

        MetricsData.Builder builder = MetricsData.newBuilder();
        for (Metric metric : metricsList) {
            ResourceMetrics rm = ResourceMetrics.newBuilder()
                .setResource(Resource.newBuilder().build())
                .addScopeMetrics(ScopeMetrics.newBuilder()
                    .addMetrics(metric)
                    .build()
                ).build();
            builder.addResourceMetrics(rm);
        }

        return builder.build();
    }

}
