package org.gcube.portlets.user.td.csvimportwidget.client;

import java.util.ArrayList;

import org.gcube.portlets.user.td.csvimportwidget.client.csvgrid.CSVGrid;
import org.gcube.portlets.user.td.wizardwidget.client.WizardCard;
import org.gcube.portlets.user.td.csvimportwidget.client.util.ErrorMessageBox;
import org.gcube.portlets.user.td.gwtservice.client.rpc.TDGWTServiceAsync;
import org.gcube.portlets.user.td.gwtservice.shared.csv.AvailableCharsetList;
import org.gcube.portlets.user.td.gwtservice.shared.csv.CSVImportSession;
import org.gcube.portlets.user.td.gwtservice.shared.csv.CSVRowError;
import org.gcube.portlets.user.td.gwtservice.shared.file.HeaderPresence;

import com.allen_sauer.gwt.log.client.Log;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HasValue;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.sencha.gxt.cell.core.client.form.ComboBoxCell.TriggerAction;
import com.sencha.gxt.core.client.util.Padding;
import com.sencha.gxt.core.client.util.ToggleGroup;
import com.sencha.gxt.data.shared.LabelProvider;
import com.sencha.gxt.data.shared.StringLabelProvider;
import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer;
import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer.VerticalLayoutData;
import com.sencha.gxt.widget.core.client.event.SelectEvent;
import com.sencha.gxt.widget.core.client.event.SelectEvent.SelectHandler;
import com.sencha.gxt.widget.core.client.form.FieldLabel;
import com.sencha.gxt.widget.core.client.form.FormPanel;
import com.sencha.gxt.widget.core.client.form.Radio;
import com.sencha.gxt.widget.core.client.form.SimpleComboBox;
import com.sencha.gxt.widget.core.client.form.TextField;
import com.sencha.gxt.widget.core.client.form.validator.MaxLengthValidator;
import com.sencha.gxt.widget.core.client.tips.ToolTip;
import com.sencha.gxt.widget.core.client.tips.ToolTipConfig;

/**
 * 
 * @author "Giancarlo Panichi" <a
 *         href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a>
 * 
 */
public class CSVConfigCard extends WizardCard {

	private static final String DEFAULT_DELIMETER = ",";
	private static final String DEFAULT_COMMENT = "#";
	protected CSVImportSession csvImportSession;

	protected SimpleComboBox<String> encodings;
	protected SimpleComboBox<HeaderPresence> header;
	protected TextField customDelimiterField;
	protected Radio otherDelimiter;
	protected Radio commaDelimiter;
	protected Radio spaceDelimiter;
	protected Radio tabDelimiter;
	protected Radio semicoloDelimiter;
	protected TextField commentField;
	protected CsvCheckPanel csvCheckPanel;

	protected CSVGrid csvSample;

	public CSVConfigCard(final CSVImportSession csvImportSession) {
		super("CSV configuration", "");
		if (csvImportSession == null) {
			Log.error("CSVImportSession is null");
		}
		this.csvImportSession = csvImportSession;

		FormPanel panel = createPanel();
		setContent(panel);

	}

	protected FormPanel createPanel() {
		FormPanel panel = new FormPanel();
		panel.setLabelWidth(90);
		panel.getElement().setPadding(new Padding(5));

		VerticalLayoutContainer content = new VerticalLayoutContainer();
		panel.add(content);

		encodings = new SimpleComboBox<String>(
				new StringLabelProvider<String>());
		encodings.setToolTip("The CSV file encoding");
		encodings.setTabIndex(0);
		encodings.setEditable(false);
		encodings.setForceSelection(true);
		encodings.setTriggerAction(TriggerAction.ALL);
		encodings.addSelectionHandler(new SelectionHandler<String>() {

		
			public void onSelection(SelectionEvent<String> event) {
				updateGrid();
			}
		});

		content.add(new FieldLabel(encodings, "File encoding"));

		LabelProvider<HeaderPresence> labelProvider = new LabelProvider<HeaderPresence>() {

			public String getLabel(HeaderPresence item) {
				return item.getLabel();
			}
		};

		header = new SimpleComboBox<HeaderPresence>(labelProvider);
		header.setToolTip("The CSV file header");
		header.setTabIndex(0);
		header.setEditable(false);
		header.setForceSelection(true);
		header.setTriggerAction(TriggerAction.ALL);
		for (HeaderPresence headerPresence : HeaderPresence.values())
			header.add(headerPresence);
		header.setValue(HeaderPresence.NONE);
		header.addSelectionHandler(new SelectionHandler<HeaderPresence>() {

			public void onSelection(SelectionEvent<HeaderPresence> event) {
				updateGrid();
			}
		});

		content.add(new FieldLabel(header, "Header"));

		commaDelimiter = new Radio();
		commaDelimiter.setBoxLabel("Comma");
		commaDelimiter.setValue(true);

		spaceDelimiter = new Radio();
		spaceDelimiter.setBoxLabel("Space");

		tabDelimiter = new Radio();
		tabDelimiter.setBoxLabel("Tab");

		semicoloDelimiter = new Radio();
		semicoloDelimiter.setBoxLabel("Semicolon");

		otherDelimiter = new Radio();
		otherDelimiter.setBoxLabel("Other delimiter");

		customDelimiterField = new TextField();
		customDelimiterField.setEnabled(false);
		customDelimiterField.setValue(DEFAULT_DELIMETER);
		customDelimiterField.setAllowBlank(false);
		customDelimiterField.setWidth(20);

		ToggleGroup delimitersGroup = new ToggleGroup();
		delimitersGroup.add(commaDelimiter);
		delimitersGroup.add(spaceDelimiter);
		delimitersGroup.add(tabDelimiter);
		delimitersGroup.add(semicoloDelimiter);
		delimitersGroup.add(otherDelimiter);

		delimitersGroup
				.addValueChangeHandler(new ValueChangeHandler<HasValue<Boolean>>() {

					public void onValueChange(
							ValueChangeEvent<HasValue<Boolean>> event) {

						customDelimiterField.setEnabled(otherDelimiter
								.getValue());

						if (!otherDelimiter.getValue())
							customDelimiterField.clearInvalid();
						else
							customDelimiterField.validate();

						if (otherDelimiter.getValue()
								&& !customDelimiterField.isValid())
							return;

						updateGrid();
					}
				});

		HorizontalPanel delimitersPanel = new HorizontalPanel();
		delimitersPanel.add(commaDelimiter);
		delimitersPanel.add(spaceDelimiter);
		delimitersPanel.add(tabDelimiter);
		delimitersPanel.add(semicoloDelimiter);
		delimitersPanel.add(otherDelimiter);
		delimitersPanel.add(customDelimiterField);

		new ToolTip(delimitersPanel, new ToolTipConfig(
				"The delimiter use to delimit the CSV fields"));
		content.add(new FieldLabel(delimitersPanel, "Delimiter"));

		commentField = new TextField();
		commentField.setToolTip("The character used as comment line prefix");
		commentField.setValue(DEFAULT_COMMENT);
		commentField.setAllowBlank(false);
		commentField.getValidators().add(new MaxLengthValidator(1));
		commentField.setWidth(20);
		commentField.addChangeHandler(new ChangeHandler() {

			public void onChange(ChangeEvent event) {
				if (commentField.isValid())
					updateGrid();
			}
		});

		content.add(new FieldLabel(commentField, "Comment"));

		csvSample = new CSVGrid();
		content.add(csvSample, new VerticalLayoutData(1, -1));

		content.add(new HTML("<BR>"));

		csvCheckPanel = new CsvCheckPanel();
		content.add(csvCheckPanel);

		csvCheckPanel.getCheckConfiguration().addSelectHandler(
				new SelectHandler() {

					public void onSelect(SelectEvent event) {
						checkConfiguration();
					}
				});

		csvCheckPanel.getSkipInvalidCheckBox().addValueChangeHandler(
				new ValueChangeHandler<Boolean>() {

					public void onValueChange(ValueChangeEvent<Boolean> event) {
						boolean skip = csvCheckPanel.getSkipInvalidCheckBox()
								.getValue();
						setEnableNextButton(skip);
						CSVConfigCard.this.csvImportSession
								.setSkipInvalidLines(skip);
					}
				});

		
		return panel;
	}

	protected void checkConfiguration() {
		csvCheckPanel.setActiveCheckingPanel();
		csvCheckPanel.getCheckConfiguration().setEnabled(false);

		TDGWTServiceAsync.INSTANCE.checkCSV(100,
				new AsyncCallback<ArrayList<CSVRowError>>() {

					public void onFailure(Throwable caught) {
						ErrorMessageBox
								.showError(
										"An error occured checking the file",
										"Please retry, if the error perstists change the CSV configuration",
										"");
					}

					public void onSuccess(ArrayList<CSVRowError> errors) {
						csvCheckPanel.getCheckConfiguration().setEnabled(true);

						if (errors.size() == 0) {
							setCheckCorrectMessage();
						} else {
							setCheckErrorMessage(errors);
						}
					}
				});
	}

	protected void updateGrid() {
		GWT.log("Started updating GRID");

		resetCheckMessage();

		csvSample.mask("Updating...");

		GWT.log("updating CSV config");

		HeaderPresence headerPresence = header.getCurrentValue();

		char delimiter = getSelectedDelimiter();

		String encoding = encodings.getCurrentValue();
		char commentChar = commentField.getValue().charAt(0);

		TDGWTServiceAsync.INSTANCE.configureCSVParser(encoding, headerPresence,
				delimiter, commentChar, new AsyncCallback<ArrayList<String>>() {

					public void onFailure(Throwable caught) {
						Log.error("Failed updating CSV config", caught);
						setEnableNextButton(false);
						ErrorMessageBox
								.showError(
										"An error occured checking the file",
										"Please retry, if the error perstists change the CSV configuration",
										caught.getLocalizedMessage());

					}

					public void onSuccess(ArrayList<String> result) {
						Log.info("CSV header getted");

						csvImportSession.setHeaders(result);

						for (String name : result)
							Log.info("Column HEADER: " + name);

						// csvImportSession.getId()
						csvSample.configureColumns(result);
						csvSample.unmask();

						setEnableNextButton(false);

					}
				});

	}

	protected char getSelectedDelimiter() {
		if (otherDelimiter.getValue())
			return customDelimiterField.getValue().charAt(0);
		if (commaDelimiter.getValue())
			return ',';
		if (spaceDelimiter.getValue())
			return ' ';
		if (tabDelimiter.getValue())
			return '\t';
		if (semicoloDelimiter.getValue())
			return ';';
		return DEFAULT_DELIMETER.charAt(0);
	}

	@Override
	public void setup() {
		setEnableBackButton(false);
		setEnableNextButton(false);
		encodings.focus();

		TDGWTServiceAsync.INSTANCE
				.getAvailableCharset(new AsyncCallback<AvailableCharsetList>() {

					public void onSuccess(AvailableCharsetList result) {
						GWT.log("CharsetInfo: "
								+ result.getCharsetList().size()
								+ " charset, default: "
								+ result.getDefaultCharset());

						for (String charset : result.getCharsetList())
							encodings.add(charset);

						encodings.setValue(result.getDefaultCharset());

						updateGrid();
					}

					/**
					 * {@inheritDoc}
					 */
					public void onFailure(Throwable caught) {
						GWT.log("Error loading charset list", caught);
						showErrorAndHide("Error loading charset list",
								"Error loading charset list", "", caught);
					}
				});

		resetCheckMessage();

		Command sayNextCard = new Command() {

			public void execute() {
				CSVTableDetailCard csvTableDetailCard = new CSVTableDetailCard(
						csvImportSession);
				getWizardWindow()
						.addCard(csvTableDetailCard);
				Log.info("NextCard SDMXTableDetailCard");
				getWizardWindow().nextCard();
				
			}

		};

		getWizardWindow().setNextButtonCommand(sayNextCard);

	}

	protected void resetCheckMessage() {
		csvCheckPanel.setActiveInfoPanel();
	}

	protected void setCheckErrorMessage(ArrayList<CSVRowError> errors) {
		csvCheckPanel.setActiveFailure(errors);
		setEnableNextButton(false);
		
	}

	protected void setCheckCorrectMessage() {
		csvCheckPanel.setActiveSuccess();
		setEnableNextButton(true);
	}

	@Override
	public void dispose() {
		csvImportSession
				.setColumnToImportMask(csvSample.getImportColumnsMask());
	}

}