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/*

 * Copyright 2009 Electronic Business Systems Ltd.

 *

 * This file is part of GSS.

 *

 * GSS 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 3 of the License, or

 * (at your option) any later version.

 *

 * GSS 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 should have received a copy of the GNU General Public License

 * along with GSS.  If not, see <http://www.gnu.org/licenses/>.

 */

package gr.ebs.gss.client.rest;

import gr.ebs.gss.client.GSS;

import gr.ebs.gss.client.rest.resource.FileResource;

import gr.ebs.gss.client.rest.resource.FolderResource;

import gr.ebs.gss.client.rest.resource.GroupResource;

import gr.ebs.gss.client.rest.resource.GroupUserResource;

import gr.ebs.gss.client.rest.resource.GroupsResource;

import gr.ebs.gss.client.rest.resource.OtherUserResource;

import gr.ebs.gss.client.rest.resource.OthersResource;

import gr.ebs.gss.client.rest.resource.RestResource;

import gr.ebs.gss.client.rest.resource.SearchResource;

import gr.ebs.gss.client.rest.resource.SharedResource;

import gr.ebs.gss.client.rest.resource.TagsResource;

import gr.ebs.gss.client.rest.resource.TrashResource;

import gr.ebs.gss.client.rest.resource.UploadStatusResource;

import gr.ebs.gss.client.rest.resource.UserResource;

import gr.ebs.gss.client.rest.resource.UserSearchResource;

import com.google.gwt.http.client.Request;

import com.google.gwt.http.client.Response;

/**

 * @author kman

 */

public abstract class GetCommand<T extends RestResource> extends RestCommand{

        boolean complete = false;

        T result = null;

        Class<T> aclass;

        public GetCommand(Class<T> theclass, String pathToGet){

                this(theclass,pathToGet,true);

        }

        public GetCommand(Class<T> theclass, String pathToGet, boolean showLoading){

                setShowLoadingIndicator(showLoading);

                if(isShowLoadingIndicator())

                        GSS.get().showLoadingIndicator();

                this.aclass = theclass;

                final String path;

                if(pathToGet.indexOf("?") != -1)

                        path = pathToGet;

                else

                        path =fixPath(pathToGet);

                RestRequestBuilder builder = new RestRequestBuilder("GET", path);

                try {

                        handleHeaders(builder, path);

                        builder.sendRequest("", new RestCallback(path) {

                                @Override

                                public Object deserialize(Response response) {

                                        return deserializeResponse(path, response);

                                }

                                @Override

                                public void handleError(Request request, Throwable exception) {

                                        complete = true;

                                        GetCommand.this.onError(exception);

                                }

                                @Override

                                public void handleSuccess(Object object) {

                                        result = (T) object;

                                        complete = true;

                                }

                        });

                } catch (Exception ex) {

                        complete = true;

                        onError(ex);

                }

        }

        public GetCommand(Class<T> theclass, String username , String pathToGet){

                this(theclass,username, pathToGet, true);

        }

        public GetCommand(Class<T> theclass, String username , String pathToGet, boolean showLoading){

                setShowLoadingIndicator(showLoading);

                if(isShowLoadingIndicator())

                        GSS.get().showLoadingIndicator();

                this.aclass = theclass;

                final String path = fixPath(pathToGet);

                RestRequestBuilder builder = new RestRequestBuilder("GET", path);

                try {

                        handleHeaders(username, builder, path);

                        builder.sendRequest("", new RestCallback(path) {

                                @Override

                                public Object deserialize(Response response) {

                                        return deserializeResponse(path, response);

                                }

                                @Override

                                public void handleError(Request request, Throwable exception) {

                                        complete = true;

                                        GetCommand.this.onError(exception);

                                }

                                @Override

                                public void handleSuccess(Object object) {

                                        result = (T) object;

                                        complete = true;

                                }

                        });

                } catch (Exception ex) {

                        complete = true;

                        onError(ex);

                }

        }

        public boolean isComplete() {

                return complete;

        }

        public T getResult(){

                return result;

        }

        public boolean execute() {

                boolean com = isComplete();

                if(com){

                        if(isShowLoadingIndicator())

                                GSS.get().hideLoadingIndicator();

                        if(getResult() != null)

                                onComplete();

                        return false;

                }

                return true;

        }

        public Object deserializeResponse(String path, Response response) {

                RestResource result1 = null;

                if(aclass.equals(FolderResource.class)){

                        result1 = new FolderResource(path);

                        result1.createFromJSON(response.getText());

                }

                else if(aclass.equals(FileResource.class)){

                        result1 = new FileResource(path);

                        result1.createFromJSON(response.getHeader("X-GSS-Metadata"));

                }

                else if(aclass.equals(GroupsResource.class)){

                        result1 = new GroupsResource(path);

                        result1.createFromJSON(response.getText());

                }

                else if(aclass.equals(TrashResource.class)){

                        result1 = new TrashResource(path);

                        result1.createFromJSON(response.getText());

                }

                else if(aclass.equals(SharedResource.class)){

                        result1 = new SharedResource(path);

                        result1.createFromJSON(response.getText());

                }

                else if(aclass.equals(OthersResource.class)){

                        result1 = new OthersResource(path);

                        result1.createFromJSON(response.getText());

                }

                else if(aclass.equals(OtherUserResource.class)){

                        result1 = new OtherUserResource(path);

                        result1.createFromJSON(response.getText());

                }

                else if(aclass.equals(GroupResource.class)){

                        result1 = new GroupResource(path);

                        result1.createFromJSON(response.getText());

                }

                else if(aclass.equals(GroupUserResource.class)){

                        result1 = new GroupUserResource(path);

                        result1.createFromJSON(response.getText());

                }

                else if(aclass.equals(UserResource.class)){

                        result1 = new UserResource(path);

                        result1.createFromJSON(response.getText());

                }

                else if(aclass.equals(TagsResource.class)){

                        result1 = new TagsResource(path);

                        result1.createFromJSON(response.getText());

                }

                else if(aclass.equals(SearchResource.class)){

                        result1 = new SearchResource(path);

                        result1.createFromJSON(response.getText());

                }

                else if(aclass.equals(UserSearchResource.class)){

                        result1 = new UserSearchResource(path);

                        result1.createFromJSON(response.getText());

                }

                else if(aclass.equals(UploadStatusResource.class)){

                        result1 = new UploadStatusResource(path);

                        result1.createFromJSON(response.getText());

                }

                return result1;

        }

}