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 * JBoss, Home of Professional Open Source.
 *
 * Copyright 2022 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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 org.wildfly.extension.microprofile.telemetry.api;

import java.util.HashMap;
import java.util.Map;

import io.smallrye.opentelemetry.api.OpenTelemetryConfig;
import jakarta.enterprise.event.Observes;
import jakarta.enterprise.inject.Default;
import jakarta.enterprise.inject.spi.AfterBeanDiscovery;
import jakarta.enterprise.inject.spi.BeanManager;
import jakarta.enterprise.inject.spi.Extension;
import jakarta.inject.Singleton;
import org.eclipse.microprofile.config.Config;

public class MicroProfileTelemetryCdiExtension implements Extension {
    private final Map<String, String> serverConfig;

    public MicroProfileTelemetryCdiExtension(Map<String, String> serverConfig) {
        this.serverConfig = serverConfig;
    }

    public void registerOpenTelemetryConfigBean(@Observes AfterBeanDiscovery abd, BeanManager beanManager) {
        abd.addBean()
                .scope(Singleton.class)
                .addQualifier(Default.Literal.INSTANCE)
                .types(OpenTelemetryConfig.class)
                .createWith(c -> {
                            Config appConfig = beanManager.createInstance().select(Config.class).get();
                            Map<String, String> properties = new HashMap<>(serverConfig);
                            // MicroProfile Telemetry is disabled by default
                            properties.put("otel.sdk.disabled", "true");
                            properties.put("otel.experimental.sdk.enabled", "false");
                            for (String propertyName : appConfig.getPropertyNames()) {
                                if (propertyName.startsWith("otel.") || propertyName.startsWith("OTEL_")) {
                                    appConfig.getOptionalValue(propertyName, String.class).ifPresent(
                                            value -> properties.put(propertyName, value));
                                }
                            }

                            return (OpenTelemetryConfig) () -> properties;
                        }
                );
    }
}
