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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.MultipleGetCommand.Cached;

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.RestResource;

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

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

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

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import com.google.gwt.core.client.GWT;

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

import com.google.gwt.user.client.DeferredCommand;

/**

 * @author kman

 *

 */

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

        String[] paths;

        Class<T> aclass;

        List<T> result = new ArrayList<T>();

        Map<String, Throwable> errors = new HashMap<String, Throwable>();

        private boolean requestSent=false;

        Cached[] cached;

        public MultipleHeadCommand(Class<T> theClass, String[] pathToGet, Cached[] theCached) {

                this(theClass, pathToGet, true, theCached);

        }

        public MultipleHeadCommand(Class<T> theClass, String[] pathToGet, boolean showLoading, Cached[] theCached) {

                setShowLoadingIndicator(showLoading);

                if(isShowLoadingIndicator())

                        GSS.get().showLoadingIndicator();

                paths = pathToGet;

                this.aclass = theClass;

                this.cached = theCached;

                //sendRequest();

        }

        private void sendRequest() {

                if(requestSent)

                        return;

                requestSent=true;

                if(cached!=null)

                        for (final Cached c : cached){

                                final String path;

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

                                        if(c.uri.indexOf("?") == -1)

                                                path=c.uri+"?"+Math.random();

                                        else

                                                path=c.uri;

                                }

                                else

                                        path = fixPath(c.uri);

                                DeferredCommand.addCommand(new HeadCommand<T>(aclass,path,false, (T)c.cache) {

                                        @Override

                                        public void onComplete() {

                                                MultipleHeadCommand.this.result.add(getResult());

                                        }

                                        @Override

                                        public void onError(Throwable t) {

                                                errors.put(path, t);

                                        }

                                });

                        }

                else

                        for (String pathg : paths) {

                                final String path;

                                if(aclass.equals(FileResource.class))

                                        path = pathg;

                                else

                                        path = fixPath(pathg);

                                DeferredCommand.addCommand(new HeadCommand<T>(aclass,path,false, null) {

                                        @Override

                                        public void onComplete() {

                                                MultipleHeadCommand.this.result.add(getResult());

                                        }

                                        @Override

                                        public void onError(Throwable t) {

                                                errors.put(path, t);

                                        }

                                });

                        }

        }

        public boolean isComplete() {

                return result.size()+errors.size() == paths.length;

        }

        public List<T> getResult() {

                return result;

        }

        @Override

        public boolean execute() {

                if(!requestSent)

                        sendRequest();

                boolean com = isComplete();

                if (com) {

                        if(isShowLoadingIndicator())

                                GSS.get().hideLoadingIndicator();

                        if(hasErrors())

                                for(String p : errors.keySet())

                                        onError(p, errors.get(p));

                        onComplete();

                        return false;

                }

                return true;

        }

        /**

         * @param p

         * @param throwable

         */

        public abstract void onError(String p, Throwable throwable);

        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(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());

                }

                return result1;

        }

        public boolean hasErrors(){

                return errors.size() >0;

        }

        /**

         * Retrieve the errors.

         *

         * @return the errors

         */

        public Map<String, Throwable> getErrors() {

                return errors;

        }

        public void debug(){

                GWT.log("--->"+result.size(), null);

                GWT.log("-ERRORS-->"+getErrors().size(), null);

                for(String p : getErrors().keySet())

                        GWT.log("error:"+p, getErrors().get(p));

        }

}