EDIT

/**

* Copyright (C) 2007 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.io.common;

import java.lang.reflect.Constructor;

import java.lang.reflect.InvocationTargetException;

import java.util.HashMap;

import java.util.Map;

import org.apache.log4j.Logger;

import org.springframework.beans.BeansException;

import org.springframework.context.ApplicationContext;

import org.springframework.context.ApplicationContextAware;

import org.springframework.security.authentication.AuthenticationManager;

import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;

import org.springframework.security.core.Authentication;

import org.springframework.security.core.context.SecurityContext;

import org.springframework.security.core.context.SecurityContextHolder;

import org.springframework.stereotype.Component;

import eu.etaxonomy.cdm.api.application.CdmRepository;

import eu.etaxonomy.cdm.api.service.IService;

import eu.etaxonomy.cdm.io.common.events.IIoObserver;

import eu.etaxonomy.cdm.io.fact.altitude.in.analyze.ExcelFormatAnalyzeResult;

import eu.etaxonomy.cdm.io.fact.altitude.in.analyze.ExcelFormatAnalyzer;

import eu.etaxonomy.cdm.io.fact.in.FactExcelImportConfiguratorBase;

import eu.etaxonomy.cdm.model.common.CdmBase;

/**

 * @author a.mueller

 * @since 20.06.2008

 */

@Component("defaultImport")

public class CdmApplicationAwareDefaultImport<T extends IImportConfigurator> implements ICdmImporter<T>, ApplicationContextAware {

    private static final Logger logger = Logger.getLogger(CdmApplicationAwareDefaultImport.class);

    protected ApplicationContext applicationContext;

    @Override

    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {

        this.applicationContext = applicationContext;

    }

    //Constants

    final boolean OBLIGATORY = true;

    final boolean FACULTATIVE = false;

    final int modCount = 1000;

    IService<CdmBase> service = null;

    //different type of stores that are used by the known imports

    Map<String, MapWrapper<? extends CdmBase>> stores = new HashMap<>();

    public CdmApplicationAwareDefaultImport(){

    	stores.put(ICdmIO.TEAM_STORE, new MapWrapper<>(service));

        stores.put(ICdmIO.REFERENCE_STORE, new MapWrapper<>(service));

        stores.put(ICdmIO.NOMREF_STORE, new MapWrapper<>(service));

        stores.put(ICdmIO.TAXONNAME_STORE, new MapWrapper<>(service));

        stores.put(ICdmIO.TAXON_STORE, new MapWrapper<>(service));

        stores.put(ICdmIO.SPECIMEN_STORE, new MapWrapper<>(service));

    }

    @Override

    public ImportResult invoke(IImportConfigurator config){

        ImportResult result = new ImportResult();

        if (config.getCheck().equals(IImportConfigurator.CHECK.CHECK_ONLY)){

            boolean success = doCheck(config);

            if (! success){

                result.setAborted();

            }

        }else if (config.getCheck().equals(IImportConfigurator.CHECK.CHECK_AND_IMPORT)){

            boolean success = doCheck(config);

            if (success){

                result = doImport(config);

            }else{

                result.setAborted();

            }

        }else if (config.getCheck().equals(IImportConfigurator.CHECK.IMPORT_WITHOUT_CHECK)){

            result = doImport(config);

        }else{

            String message = "Unknown CHECK type";

            logger.error(message);

            result.addError(message);

        }

        return result;

    }

    @SuppressWarnings("unchecked")

    protected <S extends IImportConfigurator> boolean doCheck(S  config){

        boolean result = true;

        //check

        if (config == null){

            logger.warn("CdmImportConfiguration is null");

            return false;

        }

        System.out.println("Start checking Source ("+ config.getSourceNameString() + ") ...");

        if (! config.isValid()){

            logger.warn("CdmImportConfiguration is not valid");

            return false;

        }

        ImportStateBase state = config.getNewState();

        state.initialize(config);

        state.setCheck(true);

        if (config instanceof FactExcelImportConfiguratorBase<?>){

            ExcelFormatAnalyzer<?> analyzer = ((FactExcelImportConfiguratorBase<?>)config).getAnalyzer();

            ExcelFormatAnalyzeResult analyzeResult = analyzer.invoke();

            //TODO very preliminary for development only

            System.out.println(analyzeResult.toString());

            try {

                for (Class<ICdmImport> ioClass: config.getIoClassList()){

                    Constructor<ICdmImport> constructor = ioClass.getConstructor();

                    constructor.setAccessible(true);

                    ICdmImport ioInstance = constructor.newInstance();

                    CdmRepository repository = (CdmRepository)applicationContext.getBean("CdmRepository");

                    ioInstance.setRepository(repository);

//                    ioInstance.analyze();

                }

            } catch (NoSuchMethodException | SecurityException | InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {

                analyzeResult.addFatalError("Problem accessing the constructor of the import class. Please contact your system developers");

            }

            if (analyzeResult.hasErrors()){

                result = false;

            }

        }else{

            //do check for each class

            for (Class<ICdmImport> ioClass: config.getIoClassList()){

                try {

                    String ioBeanName = getComponentBeanName(ioClass);

                    ICdmIO cdmIo = applicationContext.getBean(ioBeanName, ICdmIO.class);

                    if (cdmIo != null){

                        registerObservers(config, cdmIo);

                        state.setCurrentIO(cdmIo);

                        result &= cdmIo.check(state);

                        unRegisterObservers(config, cdmIo);

                    }else{

                        logger.error("cdmIO was null");

                        result &= false;

                    }

                } catch (Exception e) {

                    logger.error(e);

                    e.printStackTrace();

                    result &= false;

                }

            }

        }

        //return

        System.out.println("End checking Source ("+ config.getSourceNameString() + ") for import to Cdm");

        state.setCheck(false);

        return result;

    }

    private void registerObservers(IImportConfigurator config, ICdmIO io){

        for (IIoObserver observer : config.getObservers()){

            io.addObserver(observer);

        }

    }

    private void unRegisterObservers(IImportConfigurator config, ICdmIO io){

        for (IIoObserver observer : config.getObservers()){

            io.removeObserver(observer);

        }

    }

    /**

     * Executes the whole

     */

    protected <S extends IImportConfigurator>  ImportResult doImport(S config){

        ImportResult result = new ImportResult();

        //validate

        if (config == null){

            String message = "Configuration is null";

            logger.error(message);

            result.addError(message);

            result.setAborted();

            return result;

        }

        if (! config.isValid()){

            String message = "Configuration is not valid";

            logger.error(message);

            result.addError(message);

            result.setAborted();

            return result;

        }

        config.getSourceReference();

        logger.info("Start import from Source '"+ config.getSourceNameString() + "' to destination '" + config.getDestinationNameString() + "'");

        ImportStateBase state = config.getNewState();

        state.initialize(config);

        state.setResult(result);

//        CdmPermissionEvaluator permissionEval = applicationContext.getBean("cdmPermissionEvaluator", CdmPermissionEvaluator.class);

        state.setSuccess(true);

        //do invoke for each class

        for (Class<ICdmImport> ioClass: config.getIoClassList()){

            try {

                String ioBeanName = getComponentBeanName(ioClass);

                ICdmImport cdmIo = applicationContext.getBean(ioBeanName, ICdmImport.class);

                if (cdmIo != null){

                    registerObservers(config, cdmIo);

                    state.setCurrentIO(cdmIo);

                    cdmIo.invoke(state);

                    result.addReport(state.getReportAsByteArray());

                    unRegisterObservers(config, cdmIo);

                }else{

                    String message = "cdmIO was null";

                    logger.error(message);

                    result.addError(message);

                }

            } catch (Exception e) {

                logger.error(e);

                e.printStackTrace();

                result.addException(e);

            }

        }

        logger.info("End import from source '" + config.getSourceNameString()

                + "' to destination '" + config.getDestinationNameString() + "'"

                + "("+ result.toString() + ")"

                ) ;

        return result;

    }

    /**

     * Returns the name of a component bean. If the name is defined in the Component annotation this name is returned.

     * Otherwise the class name is returned with starting lower case.

     * @param ioClass

     * @return

     * @throws IllegalArgumentException if the class does not have a "Component" annotation

     */

    public static String getComponentBeanName(Class<ICdmImport> ioClass) throws IllegalArgumentException {

        Component component = ioClass.getAnnotation(Component.class);

        if (component == null){

            throw new IllegalArgumentException("Class " + ioClass.getName() + " is missing a @Component annotation." );

        }

        String ioBean = component.value();

        if ("".equals(ioBean)){

            ioBean = ioClass.getSimpleName();

            ioBean = ioBean.substring(0, 1).toLowerCase() + ioBean.substring(1); //make camelcase

        }

        return ioBean;

    }

    public void authenticate(IImportConfigurator config) {

        UsernamePasswordAuthenticationToken token = config.getAuthenticationToken();

        if (token != null){

            SecurityContext context = SecurityContextHolder.getContext();

            AuthenticationManager authenticationManager = applicationContext.getBean("authenticationManager", AuthenticationManager.class);;

            Authentication authentication = authenticationManager.authenticate(token);

            context.setAuthentication(authentication);

        }else{

        	logger.warn("No authentication token available");

        }

    }

}