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/*
 * 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.eventmesh.trace.jaeger;

import static io.opentelemetry.api.common.AttributeKey.stringKey;

import org.apache.eventmesh.common.config.Config;
import org.apache.eventmesh.trace.api.AbstractTraceService;
import org.apache.eventmesh.trace.api.common.EventMeshTraceConstants;
import org.apache.eventmesh.trace.api.exception.TraceException;
import org.apache.eventmesh.trace.jaeger.config.JaegerConfiguration;

import java.util.concurrent.TimeUnit;

import io.opentelemetry.api.common.Attributes;
import io.opentelemetry.exporter.jaeger.JaegerGrpcSpanExporter;
import io.opentelemetry.sdk.resources.Resource;
import io.opentelemetry.sdk.trace.SpanProcessor;
import io.opentelemetry.sdk.trace.export.BatchSpanProcessor;

import lombok.Getter;
import lombok.Setter;

@Config(field = "jaegerConfiguration")
@Config(field = "exporterConfiguration")
public class JaegerTraceService extends AbstractTraceService {

    /**
     * Unified configuration class corresponding to jaeger.properties
     */
    @Getter
    @Setter
    private transient JaegerConfiguration jaegerConfiguration;

    @Override
    public void init() throws TraceException {
        // jaeger's config
        final String eventMeshJaegerIp = jaegerConfiguration.getEventMeshJaegerIp();
        final int eventMeshJaegerPort = jaegerConfiguration.getEventMeshJaegerPort();
        // exporter's config
        final int eventMeshTraceExportInterval = exporterConfiguration.getEventMeshTraceExportInterval();
        final int eventMeshTraceExportTimeout = exporterConfiguration.getEventMeshTraceExportTimeout();
        final int eventMeshTraceMaxExportSize = exporterConfiguration.getEventMeshTraceMaxExportSize();
        final int eventMeshTraceMaxQueueSize = exporterConfiguration.getEventMeshTraceMaxQueueSize();

        final String httpEndpoint = String.format("http://%s:%s", eventMeshJaegerIp, eventMeshJaegerPort);
        final JaegerGrpcSpanExporter jaegerExporter = JaegerGrpcSpanExporter.builder()
            .setEndpoint(httpEndpoint)
            .build();

        final SpanProcessor spanProcessor = BatchSpanProcessor.builder(jaegerExporter)
            .setScheduleDelay(eventMeshTraceExportInterval, TimeUnit.SECONDS)
            .setExporterTimeout(eventMeshTraceExportTimeout, TimeUnit.SECONDS)
            .setMaxExportBatchSize(eventMeshTraceMaxExportSize)
            .setMaxQueueSize(eventMeshTraceMaxQueueSize)
            .build();

        // set the trace service's name
        final Resource serviceNameResource =
            Resource.create(Attributes.of(stringKey("service.name"), EventMeshTraceConstants.SERVICE_NAME));

        initVars(spanProcessor, serviceNameResource);
    }

    public JaegerConfiguration getClientConfiguration() {
        return this.jaegerConfiguration;
    }

}