package de.hsadmin.remote;

import java.io.InputStream;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import de.hsadmin.core.model.AbstractEntity;
import de.hsadmin.core.model.AnnFieldIO;
import de.hsadmin.core.model.AuthenticationException;
import de.hsadmin.core.model.HSAdminException;
import de.hsadmin.core.model.ReadWriteAccess;
import de.hsadmin.core.model.Transaction;

public class ModulePropertiesRemote implements IRemote {

	@Override
	public List<Map<String, Object>> search(String runAsUser, String ticket,
			Map<String, String> whereParams) throws HSAdminException {
		String user = runAsUser;
		List<Map<String, Object>> result = new ArrayList<Map<String,Object>>();
		Transaction transaction = new Transaction(user);
		try {
			if (transaction.login(user, ticket)) {
				InputStream resourceAsStream = getClass().getClassLoader().getResourceAsStream("org/apache/xmlrpc/webserver/XmlRpcServlet.properties");
				Properties properties = new Properties();
				properties.load(resourceAsStream);
				
				for (Object moduleKey : properties.entrySet()) {
					Class<?> remoteClass = Class.forName(properties.getProperty((String) moduleKey));
					Object newInstance = remoteClass.newInstance();
					if (newInstance instanceof AbstractRemote) {
						Map<String,Object> modMap = new HashMap<String, Object>();
						modMap.put("module", moduleKey);
						AbstractRemote remote = (AbstractRemote) newInstance;
						Class<? extends AbstractEntity> entityClass = remote.getEntityClass();
						ArrayList<Map<String, Object>> propertiesList = new ArrayList<Map<String,Object>>();
						modMap.put("properties", propertiesList);
//						AnnFieldIO fieldIO = entityClass.getAnnotation(AnnFieldIO.class);
						for (Field f: entityClass.getDeclaredFields()) {
							HashMap<String, Object> propertyProperties = new HashMap<String, Object>();
							propertiesList.add(propertyProperties);
							AnnFieldIO fieldIO = f.getAnnotation(AnnFieldIO.class);
							String fieldName = f.getName();
							propertyProperties.put("property", fieldName);
							String regExp = fieldIO.validation();
							propertyProperties.put("validation", regExp);
							ReadWriteAccess rw = fieldIO.rw();
							propertyProperties.put("rw", rw.name());
							String[] referredProps = fieldIO.referredProps();
							propertyProperties.put("referredProps", referredProps);							
							Class<?> declaringClass = f.getDeclaringClass();
							for(String s : referredProps){					
								String fullPropertyName = fieldName+"."+s;			
								propertiesList.add(createReferredPropertyInfo(fullPropertyName, declaringClass, fullPropertyName));
							}
						}											
						result.add(modMap);
					}
				}
				return result;
			} else {
				throw new AuthenticationException("authentication failed");
			}
		} catch (Exception e) {
			throw new HSAdminException(e);
		} finally {
			transaction.close();
		}
	}

	private Map<String, Object> createReferredPropertyInfo(String fieldName, Class<?> declaringClass,
			String propertyName) throws SecurityException, NoSuchFieldException {
		int indexOfDot = propertyName.indexOf('.');
		if (indexOfDot>=0) {
			String prefix = propertyName.substring(0, indexOfDot);
			String remainingPart = propertyName.substring(indexOfDot + 1);
			return createReferredPropertyInfo(fieldName, declaringClass.getDeclaredField(prefix).getDeclaringClass(), remainingPart);
		} else {
			Map<String, Object> result = new HashMap<String, Object>();
			result.put("property", fieldName);
			return result;
		}
	}

	@Override
	public Map<String, Object> add(String runAsUser, String ticket,
			Map<String, Object> setParams) throws HSAdminException {
		throw new HSAdminException("not implemented");
	}

	@Override
	public List<Map<String, Object>> update(String runAsUser, String ticket,
			Map<String, Object> setParams, Map<String, String> whereParams)
			throws HSAdminException {
		throw new HSAdminException("not implemented");
	}

	@Override
	public void delete(String runAsUser, String ticket,
			Map<String, String> whereParams) throws HSAdminException {
		throw new HSAdminException("not implemented");
	}

}