/*
 * Copyright 2023-2025 the original author or 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
 *
 *      https://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.springframework.ai.vectorstore.milvus.autoconfigure;

import java.util.concurrent.TimeUnit;

import io.micrometer.observation.ObservationRegistry;
import io.milvus.client.MilvusServiceClient;
import io.milvus.param.ConnectParam;
import io.milvus.param.IndexType;
import io.milvus.param.MetricType;

import org.springframework.ai.embedding.BatchingStrategy;
import org.springframework.ai.embedding.EmbeddingModel;
import org.springframework.ai.embedding.TokenCountBatchingStrategy;
import org.springframework.ai.vectorstore.SpringAIVectorStoreTypes;
import org.springframework.ai.vectorstore.milvus.MilvusVectorStore;
import org.springframework.ai.vectorstore.observation.VectorStoreObservationConvention;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.boot.context.properties.PropertyMapper;
import org.springframework.context.annotation.Bean;

/**
 * {@link AutoConfiguration Auto-configuration} for Milvus Vector Store.
 *
 * @author Christian Tzolov
 * @author Eddú Meléndez
 * @author Soby Chacko
 * @author Ilayaperumal Gopinathan
 */
@AutoConfiguration
@ConditionalOnClass({ MilvusVectorStore.class, EmbeddingModel.class })
@EnableConfigurationProperties({ MilvusServiceClientProperties.class, MilvusVectorStoreProperties.class })
@ConditionalOnProperty(name = SpringAIVectorStoreTypes.TYPE, havingValue = SpringAIVectorStoreTypes.MILVUS,
		matchIfMissing = true)
public class MilvusVectorStoreAutoConfiguration {

	@Bean
	@ConditionalOnMissingBean(MilvusServiceClientConnectionDetails.class)
	PropertiesMilvusServiceClientConnectionDetails milvusServiceClientConnectionDetails(
			MilvusServiceClientProperties properties) {
		return new PropertiesMilvusServiceClientConnectionDetails(properties);
	}

	@Bean
	@ConditionalOnMissingBean(BatchingStrategy.class)
	BatchingStrategy milvusBatchingStrategy() {
		return new TokenCountBatchingStrategy();
	}

	@Bean
	@ConditionalOnMissingBean
	public MilvusVectorStore vectorStore(MilvusServiceClient milvusClient, EmbeddingModel embeddingModel,
			MilvusVectorStoreProperties properties, BatchingStrategy batchingStrategy,
			ObjectProvider<ObservationRegistry> observationRegistry,
			ObjectProvider<VectorStoreObservationConvention> customObservationConvention) {

		return MilvusVectorStore.builder(milvusClient, embeddingModel)
			.initializeSchema(properties.isInitializeSchema())
			.databaseName(properties.getDatabaseName())
			.collectionName(properties.getCollectionName())
			.embeddingDimension(properties.getEmbeddingDimension())
			.indexType(IndexType.valueOf(properties.getIndexType().name()))
			.metricType(MetricType.valueOf(properties.getMetricType().name()))
			.indexParameters(properties.getIndexParameters())
			.iDFieldName(properties.getIdFieldName())
			.autoId(properties.isAutoId())
			.contentFieldName(properties.getContentFieldName())
			.metadataFieldName(properties.getMetadataFieldName())
			.embeddingFieldName(properties.getEmbeddingFieldName())
			.batchingStrategy(batchingStrategy)
			.observationRegistry(observationRegistry.getIfUnique(() -> ObservationRegistry.NOOP))
			.customObservationConvention(customObservationConvention.getIfAvailable(() -> null))
			.build();
	}

	@Bean
	@ConditionalOnMissingBean
	public MilvusServiceClient milvusClient(MilvusVectorStoreProperties serverProperties,
			MilvusServiceClientProperties clientProperties, MilvusServiceClientConnectionDetails connectionDetails) {

		var builder = ConnectParam.newBuilder()
			.withHost(connectionDetails.getHost())
			.withPort(connectionDetails.getPort())
			.withDatabaseName(serverProperties.getDatabaseName())
			.withConnectTimeout(clientProperties.getConnectTimeoutMs(), TimeUnit.MILLISECONDS)
			.withKeepAliveTime(clientProperties.getKeepAliveTimeMs(), TimeUnit.MILLISECONDS)
			.withKeepAliveTimeout(clientProperties.getKeepAliveTimeoutMs(), TimeUnit.MILLISECONDS)
			.withRpcDeadline(clientProperties.getRpcDeadlineMs(), TimeUnit.MILLISECONDS)
			.withSecure(clientProperties.isSecure())
			.withIdleTimeout(clientProperties.getIdleTimeoutMs(), TimeUnit.MILLISECONDS)
			.withAuthorization(clientProperties.getUsername(), clientProperties.getPassword());

		if (clientProperties.isSecure()) {
			PropertyMapper mapper = PropertyMapper.get();
			mapper.from(clientProperties::getUri).whenHasText().to(builder::withUri);
			mapper.from(clientProperties::getToken).whenHasText().to(builder::withToken);
			mapper.from(clientProperties::getClientKeyPath).whenHasText().to(builder::withClientKeyPath);
			mapper.from(clientProperties::getClientPemPath).whenHasText().to(builder::withClientPemPath);
			mapper.from(clientProperties::getCaPemPath).whenHasText().to(builder::withCaPemPath);
			mapper.from(clientProperties::getServerPemPath).whenHasText().to(builder::withServerPemPath);
			mapper.from(clientProperties::getServerName).whenHasText().to(builder::withServerName);
		}

		return new MilvusServiceClient(builder.build());
	}

	static class PropertiesMilvusServiceClientConnectionDetails implements MilvusServiceClientConnectionDetails {

		private final MilvusServiceClientProperties properties;

		PropertiesMilvusServiceClientConnectionDetails(MilvusServiceClientProperties properties) {
			this.properties = properties;
		}

		@Override
		public String getHost() {
			return this.properties.getHost();
		}

		@Override
		public int getPort() {
			return this.properties.getPort();
		}

	}

}
