package org.gcube.application.cms.sdi.plugins;

import lombok.Data;
import lombok.Synchronized;
import lombok.extern.slf4j.Slf4j;
import org.bson.Document;
import org.gcube.application.cms.plugins.AbstractPlugin;
import org.gcube.application.cms.sdi.engine.SDIManagerWrapper;
import org.gcube.application.cms.sdi.faults.SDIInteractionException;
import org.gcube.application.cms.plugins.MaterializationPlugin;
import org.gcube.application.cms.plugins.faults.InitializationException;
import org.gcube.application.cms.plugins.faults.MaterializationException;
import org.gcube.application.cms.plugins.faults.ShutDownException;
import org.gcube.application.cms.plugins.model.PluginDescriptor;
import org.gcube.application.cms.plugins.reports.InitializationReport;
import org.gcube.application.cms.plugins.reports.MaterializationReport;
import org.gcube.application.cms.plugins.reports.Report;
import org.gcube.application.cms.plugins.requests.MaterializationRequest;
import org.gcube.application.cms.serialization.Serialization;
import org.gcube.application.geoportal.common.model.JSONPathWrapper;
import org.gcube.application.cms.plugins.model.ComparableVersion;
import org.gcube.application.geoportal.common.model.document.ProfiledDocument;
import org.gcube.application.geoportal.common.model.document.filesets.RegisteredFileSet;
import org.gcube.application.geoportal.common.model.profile.Field;
import org.gcube.application.geoportal.common.model.profile.Profile;
import org.gcube.application.geoportal.common.utils.ContextUtils;

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

@Slf4j
public class SDIMaterializerPlugin extends AbstractPlugin implements MaterializationPlugin {

    @Data
    public static class MaterializationConfig{
        private String schemaField;
        private String documentPath;
    }

    Map<String, SDIManagerWrapper> sdiManagerMap=null;


    private SDIManagerWrapper getSDIManager(){
        return sdiManagerMap.get(ContextUtils.getCurrentScope());
    }

    @Override
    @Synchronized
    public InitializationReport initInContext() throws InitializationException {
        InitializationReport report = new InitializationReport();
        try{
            String context = ContextUtils.getCurrentScope();
            if(getSDIManager()==null) {
                log.info("Initializing in " + context);
                sdiManagerMap.put(context,new SDIManagerWrapper());
            }
            report.setStatus(Report.Status.OK);
            report.putMessage("Initialized SDI Manager in "+context+" pointing to "+getSDIManager().getGeoserverHostName());
        } catch (SDIInteractionException e) {
            throw new InitializationException("Unable to initialize SDI Manager ",e);
        }
        return report;
    }

    @Override
    @Synchronized
    public InitializationReport init() throws InitializationException {
        InitializationReport report = new InitializationReport();
        sdiManagerMap=new HashMap<>();
        report.setStatus(Report.Status.OK);
        return report;
    }

    @Override
    public void shutdown() throws ShutDownException {

    }

    /**
     * Expected params :
     *          -workspace MANDATORY
     *          -titleField
     *
     * @param request
     * @return
     * @throws MaterializationException
     */
    @Override
    public MaterializationReport materialize(MaterializationRequest request) throws MaterializationException {
        log.info("Materializer {} : Performing {} ",this.getDescriptor().getId(),request);
        ProfiledDocument profiledDocument=request.getDocument();
        Profile profile = request.getProfile();
        Document requestArguments=request.getCallParameters();

        MaterializationReport report= new MaterializationReport(request);

        try{
            Document profileConfiguration =getConfigurationFromProfile(profile).getConfiguration();
            log.debug("Profile Configuration is {} ",profileConfiguration);
            JSONPathWrapper documentNavigator=new JSONPathWrapper(profiledDocument.getTheDocument().toJson());
            JSONPathWrapper schemaNavigator=new JSONPathWrapper(profile.getSchema().toJson());

            for(Object fsConfigObj : profileConfiguration.get("registeredFileSetPaths", List.class)){
                log.debug("Managing {} ",fsConfigObj);
                MaterializationConfig fsConfig=Serialization.convert(fsConfigObj,MaterializationConfig.class);
                List matchingFieldDefinitions =schemaNavigator.getByPath(fsConfig.getSchemaField());
                if(matchingFieldDefinitions==null || matchingFieldDefinitions.isEmpty())
                    throw new MaterializationException("Invalid Field Definition path in configuration [NO MATCH] : "+
                            fsConfig.getSchemaField());
                if(matchingFieldDefinitions.size()>1)
                    throw new MaterializationException("Invalid Field Definition path in configuration [MATCHES "+matchingFieldDefinitions.size()+"] : "+
                            fsConfig.getSchemaField());

                Field f = Serialization.convert(matchingFieldDefinitions.get(0),Field.class);

                // TODO Check if schema points to RegisteredFileSet

                for(Object fsObject : documentNavigator.getByPath(fsConfig.getDocumentPath())){
                    RegisteredFileSet fs = Serialization.convert(fsObject,RegisteredFileSet.class);
                    log.debug("Found {} ",fs);
                    requestArguments.putIfAbsent("basePersistencePath",profile.getId());
                    requestArguments.putIfAbsent("documentID",profiledDocument.getId());
                    if(requestArguments.containsKey("titleField"))
                        requestArguments.putIfAbsent("layerTitle",fs.getString(requestArguments.getString("titleField")));
                    else requestArguments.putIfAbsent("layerTitle",fs.getUUID());

                    //Add FS uuid at ws_baseName
                    requestArguments.put("workspace",request.getMandatory("workspace")+"_"+ profiledDocument.getId());

                    // Actually materializing
                    RegisteredFileSet obtained = getSDIManager().materializeLayer(fs,requestArguments);
                    log.debug("Obtained {} ",obtained);
                    documentNavigator.setElement("$..[?(@."+ RegisteredFileSet.UUID+" == '"+fs.getUUID()+"')]",obtained);
                }
            }

            String finalDocument = documentNavigator.getValueCTX().jsonString();
            log.debug("Final document after materialization is {} ",finalDocument);
            report.setResultingDocument(Document.parse(finalDocument));
            report.setStatus(Report.Status.OK);
        }catch (SDIInteractionException e){
            log.error("Unable to materialize "+request,e);
            report.setStatus(Report.Status.ERROR);
            report.putMessage(e.getMessage());
        }catch (Throwable t){
            log.error("Unable to materialize "+request,t);
            report.setStatus(Report.Status.ERROR);
            report.putMessage(t.getMessage());
        }finally{
            return report;
        }
    }

    private static final PluginDescriptor DESCRIPTOR=new PluginDescriptor("SDI-Default-Materializer", PluginDescriptor.BaseTypes.MATERIALIZER);
    static {
        DESCRIPTOR.setDescription("SDI Materializer. " +
                "This plugin materialize FileSets in gCube SDI.");
        DESCRIPTOR.setVersion(new ComparableVersion("1.0.0"));
    }

    @Override
    public PluginDescriptor getDescriptor() {
        return DESCRIPTOR;
    }
}