package org.gcube.gcat.rest;

import java.util.Iterator;

import javax.ws.rs.BadRequestException;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.DefaultValue;
import javax.ws.rs.ForbiddenException;
import javax.ws.rs.GET;
import javax.ws.rs.InternalServerErrorException;
//import javax.ws.rs.NotAuthorizedException;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.ResponseBuilder;
import javax.ws.rs.core.Response.Status;
import javax.xml.ws.WebServiceException;

import org.gcube.com.fasterxml.jackson.databind.ObjectMapper;
import org.gcube.com.fasterxml.jackson.databind.node.ObjectNode;
//import org.gcube.common.authorization.control.annotations.AuthorizationControl;
import org.gcube.common.authorization.utils.manager.SecretManagerProvider;
import org.gcube.gcat.annotation.PATCH;
import org.gcube.gcat.annotation.PURGE;
import org.gcube.gcat.api.GCatConstants;
import org.gcube.gcat.api.roles.Role;
import org.gcube.gcat.configuration.CatalogueConfigurationFactory;
import org.gcube.gcat.configuration.ServiceCatalogueConfiguration;
import org.gcube.gcat.persistence.ckan.CKANUser;
import org.gcube.gcat.persistence.ckan.CKANUserCache;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.webcohesion.enunciate.metadata.rs.ResponseCode;
import com.webcohesion.enunciate.metadata.rs.StatusCodes;

/**
 * @author Luca Frosini (ISTI - CNR)
 */
@Path(Configuration.CONFIGURATIONS)
public class Configuration extends BaseREST implements org.gcube.gcat.api.interfaces.Configuration<Response,Response> {

	private static Logger logger = LoggerFactory.getLogger(Configuration.class);
	
	public static final String CONTEXT_FULLNAME_PARAMETER = "CONTEXT_FULLNAME_PARAMETER";
	
	protected String checkContext(String context) throws WebServiceException {
		if(context==null || context.compareTo("")==0) {
			throw new BadRequestException("Please provide a valid context as path parameter");
		}
		
		String c = SecretManagerProvider.instance.get().getContext();
		if(context.compareTo(Configuration.CURRENT_CONTEXT_PATH_PARAMETER)==0) {
			return c; 
		}
		
		if(context.compareTo(c)!=0) {
			throw new BadRequestException("Context provided as path parameter (i.e. " + context + ") does not match with token request context (i.e. " + c + ")");
		}
		
		return c;
	}
	
	protected String checkContext(String context, ServiceCatalogueConfiguration catalogueConfiguration) {
		String c = checkContext(context);
		if(c.compareTo(catalogueConfiguration.getContext())!=0) {
			throw new BadRequestException("Context provided in the configuration (i.e. " + catalogueConfiguration.getContext() + ") does not match with token request context (i.e. " + c + ")");
		}
		return c;
	}
	
	protected void checkRole(Role required) {
		CKANUser ckanUser = CKANUserCache.getCurrrentCKANUser();
		if(ckanUser.getRole().ordinal() < required.ordinal()) {
			throw new ForbiddenException("To perform such a request you must have " + required.getPortalRole() + " role");
		}
	}
	
	private String createOrUpdate(ServiceCatalogueConfiguration catalogueConfiguration) throws WebServiceException {
		try {
			ServiceCatalogueConfiguration gotCatalogueConfiguration = CatalogueConfigurationFactory.createOrUpdate(catalogueConfiguration);
			String configuration = gotCatalogueConfiguration.toJsonString();
			logger.debug("The new configuration in context {} is {}", catalogueConfiguration.getContext(), configuration);
			return configuration;
		}catch (WebApplicationException e) {
			throw e;
		}catch (Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	@POST
	@Consumes(GCatConstants.APPLICATION_JSON_CHARSET_UTF_8)
	@Produces(GCatConstants.APPLICATION_JSON_CHARSET_UTF_8)
	@Override
//	@AuthorizationControl(allowedRoles={Role.CATALOGUE_MANAGER}, exception=NotAuthorizedException.class)
	@StatusCodes ({
		@ResponseCode(code = 201, condition = "Catalogue configuration successfully created."),
		@ResponseCode(code = 401, condition = "Only Catalogue-Managers can create catalogue configuration."),
		@ResponseCode(code = 500, condition = "Error while persisting catalogue configuration."),
	})
	/**
	 * Creates the catalogue configuration for the current context using the json provided as parameter
	 * @param json the configuration representation
	 * 
	 *	{
	 *		"id": "584b8503-a490-4a89-8372-e21830fa716c",
	 *		"context": "/gcube/devsec/devVRE",
	 *		"defaultOrganization": "devvre",
	 *		"supportedOrganizations": [ "devvre" ],
	 *		"ckanURL": "https://ckan-d-d4s.d4science.org",
	 *		"solrURL": "https://ckan-d-d4s.d4science.org/solr/",
	 *		"socialPostEnabled": false,
	 *		"notificationToUsersEnabled": true,
	 *		"moderationEnabled": true
	 *	}
	 * 
	 * @return the created configuration
	 * 
	 * 	{
	 *		"id": "584b8503-a490-4a89-8372-e21830fa716c",
	 *		"context": "/gcube/devsec/devVRE",
	 *		"defaultOrganization": "devvre",
	 *		"supportedOrganizations": [ "devvre" ],
	 *		"ckanURL": "https://ckan-d-d4s.d4science.org",
	 *		"solrURL": "https://ckan-d-d4s.d4science.org/solr/",
	 *		"socialPostEnabled": false,
	 *		"notificationToUsersEnabled": true,
	 *		"moderationEnabled": true
	 *	}
	 *  
	 * @throws WebServiceException
	 */
	public Response create(String json) throws WebServiceException {
		try {
			ServiceCatalogueConfiguration catalogueConfiguration = ServiceCatalogueConfiguration.getServiceCatalogueConfiguration(json);
			checkContext(CURRENT_CONTEXT_PATH_PARAMETER, catalogueConfiguration);
			String ret = createOrUpdate(catalogueConfiguration);
			ResponseBuilder responseBuilder = Response.status(Status.CREATED);
			if(ret!=null) {
				responseBuilder.entity(ret).type(GCatConstants.APPLICATION_JSON_CHARSET_UTF_8);
			}
			return responseBuilder.build();
		}catch (WebApplicationException e) {
			throw e;
		}catch (Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	@GET
	@Path("/{" + CONTEXT_FULLNAME_PARAMETER + "}")
	@Produces(GCatConstants.APPLICATION_JSON_CHARSET_UTF_8)
//	@AuthorizationControl(allowedRoles={Role.CATALOGUE_EDITOR, Role.CATALOGUE_ADMIN, Role.CATALOGUE_MANAGER}, exception=NotAuthorizedException.class)
	@StatusCodes ({
		@ResponseCode(code = 200, condition = "Catalogue configuration successfully read."),
		@ResponseCode(code = 401, condition = "Only User with role Catalogue-Editors or above can read a catalogue configuration."),
		@ResponseCode(code = 500, condition = "Error while reading catalogue configuration."),
	})
	/**
	 * @param context
	 * @return
	 * @throws WebServiceException
	 */
	public Response read(@PathParam(CONTEXT_FULLNAME_PARAMETER) String context) throws WebServiceException {
		try {
			checkContext(context);
			return read();
		}catch (WebApplicationException e) {
			throw e;
		}catch (Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	@Override
	public Response read() throws WebServiceException {
		try {
			ServiceCatalogueConfiguration catalogueConfiguration = CatalogueConfigurationFactory.getInstance();
			String configuration = catalogueConfiguration.toJsonString();
			logger.debug("Configuration in context {} is {}", catalogueConfiguration.getContext(), configuration);
			ResponseBuilder responseBuilder = Response.status(Status.OK);
			if(configuration!=null) {
				responseBuilder.entity(configuration).type(GCatConstants.APPLICATION_JSON_CHARSET_UTF_8);
			}
			return responseBuilder.build();
		}catch (WebApplicationException e) {
			throw e;
		}catch (Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	@PUT
	@Path("/{" + CONTEXT_FULLNAME_PARAMETER + "}")
	@Consumes(GCatConstants.APPLICATION_JSON_CHARSET_UTF_8)
	@Produces(GCatConstants.APPLICATION_JSON_CHARSET_UTF_8)
//	@AuthorizationControl(allowedRoles={Role.CATALOGUE_MANAGER}, exception=NotAuthorizedException.class)
	@StatusCodes ({
		@ResponseCode(code = 200, condition = "Catalogue configuration successfully created/updated."),
		@ResponseCode(code = 401, condition = "Only Catalogue-Managers can create/update catalogue configuration."),
		@ResponseCode(code = 500, condition = "Error while creating/updating catalogue configuration."),
	})
	public String createOrUpdate(@PathParam(CONTEXT_FULLNAME_PARAMETER) String context, String json) throws WebServiceException {
		try {
			ServiceCatalogueConfiguration catalogueConfiguration = ServiceCatalogueConfiguration.getServiceCatalogueConfiguration(json);
			checkContext(context, catalogueConfiguration);
			return createOrUpdate(catalogueConfiguration);
		}catch (WebApplicationException e) {
			throw e;
		}catch (Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	@Override
	public Response update(String json) throws WebServiceException {
		try {
			ServiceCatalogueConfiguration catalogueConfiguration = ServiceCatalogueConfiguration.getServiceCatalogueConfiguration(json);
			checkContext(CURRENT_CONTEXT_PATH_PARAMETER);
			catalogueConfiguration = CatalogueConfigurationFactory.createOrUpdate(catalogueConfiguration);
			String configuration = catalogueConfiguration.toJsonString();
			logger.debug("Configuration in context {} has been updated to {}", catalogueConfiguration.getContext(), configuration);
			ResponseBuilder responseBuilder = Response.status(Status.OK);
			if(configuration!=null) {
				responseBuilder.entity(configuration).type(GCatConstants.APPLICATION_JSON_CHARSET_UTF_8);
			}
			return responseBuilder.build();
		}catch (WebApplicationException e) {
			throw e;
		}catch (Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	@PATCH
	@Path("/{" + CONTEXT_FULLNAME_PARAMETER + "}")
	@Consumes(GCatConstants.APPLICATION_JSON_CHARSET_UTF_8)
	@Produces(GCatConstants.APPLICATION_JSON_CHARSET_UTF_8)
//	@AuthorizationControl(allowedRoles={Role.CATALOGUE_MANAGER}, exception=NotAuthorizedException.class)
	@StatusCodes ({
		@ResponseCode(code = 200, condition = "Catalogue configuration successfully updated."),
		@ResponseCode(code = 401, condition = "Only Catalogue-Managers can update catalogue configuration."),
		@ResponseCode(code = 500, condition = "Error while updating catalogue configuration."),
	})
	public Response patch(@PathParam(CONTEXT_FULLNAME_PARAMETER) String context, String json) throws WebServiceException {
		try {
			checkContext(context);
			return patch(json);
		}catch (WebApplicationException e) {
			throw e;
		}catch (Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	@Override
	public Response patch(String json) throws WebServiceException {
		try {
			ServiceCatalogueConfiguration catalogueConfiguration = CatalogueConfigurationFactory.getInstance();
			ObjectMapper mapper = new ObjectMapper();
			ObjectNode node = (ObjectNode) mapper.readTree(json);
			
			if(node.has(ServiceCatalogueConfiguration.CONTEXT_KEY)) {
				String context = node.get(ServiceCatalogueConfiguration.CONTEXT_KEY).asText();
				String c = SecretManagerProvider.instance.get().getContext();
				if(c.compareTo(context)!=0) {
					throw new BadRequestException("Context provided in the configuration (i.e. " + catalogueConfiguration.getContext() + ") does not match with token request context (i.e. " + c + ")");
				}
				node.remove(CURRENT_CONTEXT_PATH_PARAMETER);
			}
			
			ObjectNode configuration = mapper.valueToTree(catalogueConfiguration);
			
			Iterator<String> fieldNames = node.fieldNames();
			while(fieldNames.hasNext()) {
	            String fieldName = fieldNames.next();
	            configuration.set(fieldName, node.get(fieldName));
			}
			
			ServiceCatalogueConfiguration newCatalogueConfiguration = ServiceCatalogueConfiguration.getServiceCatalogueConfiguration(configuration);
			newCatalogueConfiguration = CatalogueConfigurationFactory.createOrUpdate(newCatalogueConfiguration);
			String ret = newCatalogueConfiguration.toJsonString();
			logger.debug("Configuration in context {} has been patched to {}", catalogueConfiguration.getContext(), ret);
			ResponseBuilder responseBuilder = Response.status(Status.OK);
			if(ret!=null) {
				responseBuilder.entity(ret).type(GCatConstants.APPLICATION_JSON_CHARSET_UTF_8);
			}
			return responseBuilder.build();
		}catch (WebApplicationException e) {
			throw e;
		}catch (Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	@DELETE
	@Path("/{" + CONTEXT_FULLNAME_PARAMETER + "}")
//	@AuthorizationControl(allowedRoles={Role.CATALOGUE_MANAGER}, exception=NotAuthorizedException.class)
	@StatusCodes ({
		@ResponseCode(code = 200, condition = "Catalogue configuration successfully deleted."),
		@ResponseCode(code = 401, condition = "Only Catalogue-Managers can delete catalogue configuration."),
		@ResponseCode(code = 500, condition = "Error while deleting catalogue configuration."),
	})
	public Response delete(@PathParam(CONTEXT_FULLNAME_PARAMETER) String context, 
			@QueryParam(GCatConstants.PURGE_QUERY_PARAMETER) @DefaultValue("false") Boolean purge) throws WebServiceException {
		try {
			checkContext(context);
			if(purge) {
				return purge();
			}else {
				return delete();
			}
		}catch (WebApplicationException e) {
			throw e;
		}catch (Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	// Remove the configuration from cache and force reload
	@Override
	public Response delete() throws WebServiceException {
		try {
			CatalogueConfigurationFactory.renew();
			return Response.status(Status.NO_CONTENT).build();
		}catch (WebApplicationException e) {
			throw e;
		}catch (Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	@PURGE
	@Path("/{" + CONTEXT_FULLNAME_PARAMETER + "}")
//	@AuthorizationControl(allowedRoles={Role.CATALOGUE_MANAGER}, exception=NotAuthorizedException.class)
	@StatusCodes ({
		@ResponseCode(code = 200, condition = "Catalogue configuration successfully deleted."),
		@ResponseCode(code = 401, condition = "Only Catalogue-Managers can delete catalogue configuration."),
		@ResponseCode(code = 500, condition = "Error while deleting catalogue configuration."),
	})
	public Response purge(@PathParam(CONTEXT_FULLNAME_PARAMETER) String context) throws WebServiceException {
		try {
			checkContext(context);
			return purge();
		}catch (WebApplicationException e) {
			throw e;
		}catch (Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	// Remove the configuration from cache and from IS
	@Override
	public Response purge() throws WebServiceException {
		try {
			CatalogueConfigurationFactory.purge();
			return Response.status(Status.NO_CONTENT).build();
		}catch (WebApplicationException e) {
			throw e;
		}catch (Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
}