/*  
 *  Imixs-Workflow 
 *  
 *  Copyright (C) 2001-2020 Imixs Software Solutions GmbH,  
 *  http://www.imixs.com
 *  
 *  This program is free software; you can redistribute it and/or 
 *  modify it under the terms of the GNU General Public License 
 *  as published by the Free Software Foundation; either version 2 
 *  of the License, or (at your option) any later version.
 *  
 *  This program is distributed in the hope that it will be useful, 
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of 
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
 *  General Public License for more details.
 *  
 *  You can receive a copy of the GNU General Public
 *  License at http://www.gnu.org/licenses/gpl.html
 *  
 *  Project: 
 *      https://www.imixs.org
 *      https://github.com/imixs/imixs-workflow
 *  
 *  Contributors:  
 *      Imixs Software Solutions GmbH - Project Management
 *      Ralph Soika - Software Developer
 */

package ai.dynamixs.rag;

import java.util.List;
import java.util.Optional;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.eclipse.microprofile.config.inject.ConfigProperty;
import org.imixs.ai.workflow.OpenAIAPIService;
import org.imixs.workflow.ItemCollection;
import org.imixs.workflow.SignalAdapter;
import org.imixs.workflow.engine.WorkflowService;
import org.imixs.workflow.exceptions.AdapterException;
import org.imixs.workflow.exceptions.PluginException;

import jakarta.inject.Inject;

/**
 * The RAGAdapter is used for Retrieval-Augmented Generation workflows.
 * <p>
 * The adapter automatically index and embed text data.
 * <p>
 * The imixs-ai prompt definition defines the API endpoint and processing events
 * to adapt the indexing and the prompt template.
 * <p>
 * The Adapter can be configured by a event entity.
 * <p>
 * INDEX configuration - to add embeddings:
 * 
 * <pre>
 * {@code
        <imixs-ai name="INDEX">
            <endpoint><propertyvalue>llm.service.endpoint</propertyvalue></endpoint>
            <debug>true</debug>
        </imixs-ai>
 * }
 * </pre>
 * 
 * The Endpoint defines the Rest API endpoint of the llama-cpp http server or
 * any compatible OpenAI / Open API rest service endpoint.
 * <p>
 * Example Prompt Template:
 * 
 * 
 * <pre>
 * {@code
    <?xml version="1.0" encoding="UTF-8"?>
    <IndexDefinition>
    <index_options>{"n_predict": 4096, "temperature": 0}</index_options>
    <![CDATA[<text><itemvalue>$workflowgroup</itemvalue>: <itemvalue>$workflowstatus</itemvalue>

    # Summary
    <itemvalue>$workflowsummary</itemvalue>

    <itemvalue>offer.summary</itemvalue>

    ]]></text>
    </IndexDefinition> 
 * }
 * </pre>
 * 
 * @author Ralph Soika
 * @version 1.0
 *
 */
public class RAGAdapter implements SignalAdapter {

    public static final String ML_ENTITY = "entity";
    public static final String API_ERROR = "API_ERROR";
    public static final String LLM_PROMPT = "PROMPT";
    public static final String LLM_SUGGEST = "SUGGEST";
    public static final String LLM_INDEX = "INDEX";

    public static final int API_EVENT_SUCCESS = 110;
    public static final int API_EVENT_FAILURE = 90;

    private static Logger logger = Logger.getLogger(RAGAdapter.class.getName());

    @Inject
    @ConfigProperty(name = OpenAIAPIService.ENV_LLM_SERVICE_ENDPOINT)
    Optional<String> serviceEndpoint;

    @Inject
    private WorkflowService workflowService;

    @Inject
    private OpenAIAPIService llmService;

    @Inject
    private ClusterService clusterService;

    /**
     * Default Constructor
     */
    public RAGAdapter() {
        super();
    }

    /**
     * CDI Constructor to inject WorkflowService
     * 
     * @param workflowService
     */
    @Inject
    public RAGAdapter(WorkflowService workflowService) {
        super();
        this.workflowService = workflowService;
    }

    public void setWorkflowService(WorkflowService workflowService) {
        this.workflowService = workflowService;
    }

    /**
     * This method parses the LLM Event definitions.
     * 
     * For each PROMPT the method posts a context data (e.g text from an attachment)
     * to the Imixs-AI Analyse service endpoint
     * 
     * @throws PluginException
     */
    public ItemCollection execute(ItemCollection workitem, ItemCollection event)
            throws AdapterException, PluginException {
        String llmAPIEndpoint = null;
        String llmAPIResultEvent = null;
        String llmAPIResultItem = null;
        boolean llmAPIDebug = false;
        long processingTime = System.currentTimeMillis();

        logger.finest("...running api adapter...");

        // read optional configuration form the model or imixs.properties....
        try {

            List<ItemCollection> llmIndexDefinitions = workflowService.evalWorkflowResultXML(event, "imixs-ai",
                    LLM_INDEX, workitem, false);

            // verify if we have an INDEX configuration
            if (llmIndexDefinitions != null && llmIndexDefinitions.size() > 0) {

                for (ItemCollection indexDefinition : llmIndexDefinitions) {
                    String llmText = indexDefinition.getItemValueString("text");
                    logger.info("POST index text: " + llmText);
                    float[] indexResult = llmService.processRAGIndex(llmText, llmAPIEndpoint);

                    // clusterService.insertVector
                    logger.info("POST result: " + indexResult);
                    logger.info("result size= " + indexResult.length);
                }
            }

        } catch (PluginException e) {
            logger.severe("Unable to parse item definitions for 'imixs-ai', verify model - " + e.getMessage());
            throw new PluginException(
                    RAGAdapter.class.getSimpleName(), e.getErrorCode(),
                    "Unable to parse item definitions for 'imixs-ai', verify model - " + e.getMessage(), e);
        }

        if (llmAPIDebug) {
            logger.info("===> Total Processing Time=" + (System.currentTimeMillis() - processingTime) + "ms");
        }
        return workitem;
    }

    /**
     * This helper method parses the ml api endpoint either provided by a model
     * definition or a imixs.property or an environment variable.
     * <p>
     * If not api endpoint is defined by the model the adapter uses the default api
     * endpoint.
     * 
     * @param llmPrompt
     * @return
     * @throws PluginException
     */
    private String parseLLMEndpointByBPMN(ItemCollection llmPrompt) throws PluginException {
        boolean debug = logger.isLoggable(Level.FINE);
        String llmAPIEndpoint = null;

        // Test if the model provides a API Endpoint.
        llmAPIEndpoint = null;
        if (llmPrompt != null) {
            llmAPIEndpoint = llmPrompt.getItemValueString("endpoint");
        }

        // switch to default api endpoint?
        if (llmAPIEndpoint == null || llmAPIEndpoint.isEmpty()) {
            // set defautl api endpoint if defined
            if (serviceEndpoint.isPresent() && !serviceEndpoint.get().isEmpty()) {
                llmAPIEndpoint = serviceEndpoint.get();
            }
        }
        if (debug) {
            logger.info("......llm api endpoint " + llmAPIEndpoint);
        }

        // adapt text...
        llmAPIEndpoint = workflowService.adaptText(llmAPIEndpoint, null);

        if (!llmAPIEndpoint.endsWith("/")) {
            llmAPIEndpoint = llmAPIEndpoint + "/";
        }

        return llmAPIEndpoint;

    }

}