D-Net

package eu.dnetlib.client.widgets;

import java.util.ArrayList;

import com.github.gwtbootstrap.client.ui.Image;

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

import com.google.gwt.dom.client.Style.Float;

import com.google.gwt.dom.client.Style.TextDecoration;

import com.google.gwt.event.dom.client.ClickEvent;

import com.google.gwt.event.dom.client.ClickHandler;

import com.google.gwt.event.dom.client.KeyUpEvent;

import com.google.gwt.event.dom.client.KeyUpHandler;

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

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

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

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

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

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

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

import com.google.gwt.user.client.ui.Anchor;

import com.google.gwt.user.client.ui.FlowPanel;

import com.google.gwt.user.client.ui.HTML;

import com.google.gwt.user.client.ui.IsWidget;

import com.google.gwt.user.client.ui.Label;

import com.google.gwt.user.client.ui.TextBox;

import com.google.gwt.user.client.ui.Widget;

import eu.dnetlib.shared.FiltersData;

public class AutoCompleteWidget implements IsWidget{

	private FlowPanel masterPanel = new FlowPanel();

	private FlowPanel suggestionList = new FlowPanel();

	public TextBox inputTextBox = new TextBox();

	private static String BASE_URL = "http://dl114.madgik.di.uoa.gr/stats/";

	private FiltersData filtersData;

    private Timer timer;

    private String table = new String();

    private String field = new String();

	private String valueSelected = null;

	private HTML loadingWheel = new HTML("<div class=\"loader-big\"></div><div class=\"whiteFilm\"></div>");

	private Label loadingLabel = new Label();

	private ArrayList<String> blacklist = new ArrayList<String>();

	public interface SearchingListener{

		public void onSearch();

		public void onReturn();

	}

	private SearchingListener searchingListener;

	public void setSearchingListener(SearchingListener searchingListener){

		this.searchingListener = searchingListener;

	}

	public interface AddingListener{

		public void onEvent(String value);

	}

	public TextBox getInputTextBox() {

		return inputTextBox;

	}

	public void setInputTextBox(TextBox inputTextBox) {

		this.inputTextBox = inputTextBox;

	}

	private AddingListener addingListener;

	public void setAddingListener(AddingListener addingListener){

		this.addingListener=addingListener;

	}

    public interface DeleteListener{

    	public void onEvent();

    }

	public String getTable() {

		return table;

	}

	public void setTable(String table) {

		this.table = table;

	}

	public String getField() {

		return field;

	}

	public void setField(String field) {

		this.field = field;

	}

	public String getValueSelected(){

		return this.valueSelected;

	}

	public void setValue(String value){

		inputTextBox.setValue(value);

		inputTextBox.setText(value);

		inputTextBox.setEnabled(false);

		this.valueSelected=value;

	}

	public void setBlackList(ArrayList<String> blackList){

		this.blacklist = blackList;

	}

	public AutoCompleteWidget(String type, String placeholder,String table, String field,ArrayList<String> blacklist) {

		this.blacklist = blacklist;

		this.table = table;

		this.field = field;

		masterPanel.addStyleName("autoCompleteWidget");

		masterPanel.add(inputTextBox);

		loadingLabel.setText("Loading..");

		loadingLabel.addStyleName("suggestionInfoItemLoading");

		inputTextBox.addStyleName("filterTextBox");

		inputTextBox.getElement().setAttribute("placeholder", placeholder);

		this.inputTextBox.setFocus(true);

		inputTextBox.addKeyUpHandler(new KeyUpHandler() {

			@Override

			public void onKeyUp(KeyUpEvent event) {

				if(timer==null) {

                    timer = new Timer() {

                        @Override

                        public void run() {

                            bringRecommendations();

                        }

                    };

                    timer.schedule(750);

                } else {

                    timer.cancel();

                    timer = new Timer() {

                        @Override

                        public void run() {

                            bringRecommendations();

                        }

                    };

                    timer.schedule(750);

                }

			}

		});

	}

	public void bringRecommendations(){

		if(!inputTextBox.getText().equals("") && inputTextBox.getText().length()>=1){

			suggestionList.clear();

			masterPanel.add(suggestionList);

			suggestionList.addStyleName("suggestionList");

			Image tempImage = new Image("./loading_background.gif");

			tempImage.addStyleName("loading-image-suggestion");

			suggestionList.add(loadingLabel);

			suggestionList.add(tempImage);

			AjaxRequest(BASE_URL + "getFiltersData.php?table="+this.table+"&field="+this.field+"&input="+inputTextBox.getText()+"&type=final");

			if(searchingListener!=null){

				searchingListener.onSearch();

			}

		}else

			masterPanel.remove(AutoCompleteWidget.this.suggestionList);

	}

	private void AjaxRequest (final String URL){

		RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, URL);

		try {

			Request request = builder.sendRequest(null, new RequestCallback() {

				@Override

				public void onResponseReceived(Request request, Response response) {

					if(response.getStatusCode()==200){

						suggestionList.clear();

						filtersData = JsonUtils.safeEval(response.getText().toString());

						if(filtersData.getData()!=null && filtersData.getData().length()!=0){

							for(int i=0;i<filtersData.getData().length();i++){

								final Anchor anchor = new Anchor();

								anchor.setText(filtersData.getData().get(i).toString());

								anchor.addStyleName("suggestionItem");

								anchor.getElement().setId(filtersData.getData().get(i).toString());

								anchor.addClickHandler(new ClickHandler() {

									@Override

									public void onClick(ClickEvent event) {

										blacklist.add(anchor.getText());

										inputTextBox.setValue(anchor.getText());

										inputTextBox.setText(anchor.getText());

										inputTextBox.setEnabled(false);

										masterPanel.remove(AutoCompleteWidget.this.suggestionList);

										AutoCompleteWidget.this.valueSelected=anchor.getText();

										if(addingListener!=null){

											addingListener.onEvent(anchor.getText());	

										}

									}

								});

								boolean found=false;

								for(int j=0;j<blacklist.size();j++){

									if(blacklist.get(j).equals(filtersData.getData().get(i).toString())){

										anchor.getElement().getStyle().setTextDecoration(TextDecoration.LINE_THROUGH);

										found=true;

										break;

									}

								}

								if(found){

									anchor.getElement().getStyle().setTextDecoration(TextDecoration.LINE_THROUGH);

									anchor.setText(anchor.getText()+"(added)");

									anchor.getElement().getStyle().setProperty("pointer-events", "none");

								}else{

								}

								suggestionList.add(anchor);

							}

						}else{

							Label label = new Label("No result found");

							label.addStyleName("suggestionInfoItem");

							suggestionList.add(label);

						}

						if(searchingListener!=null){

							searchingListener.onReturn();

						}

						suggestionList.addStyleName("suggestionList");

						masterPanel.remove(AutoCompleteWidget.this.suggestionList);

						masterPanel.add(suggestionList);

						AutoCompleteWidget.this.suggestionList = suggestionList;

					}else{

						DisplayError("Could not retrieve JSON");

					}

				}

				@Override

				public void onError(Request request, Throwable exception) {

					DisplayError("Could not retrieve JSON2 ");

				}

			});

		} catch (RequestException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

			DisplayError("Could not retrieve JSON3");

		}

	}

	public void DisplayError(String msg){

		Window.alert(msg);

	}

	@Override

	public Widget asWidget() {

		return masterPanel;

	}

    public void addStyleName(String styleName) {

        masterPanel.addStyleName(styleName);

    }

}