/*******************************************************************************
 * Copyright (c) 2004, 2010 Eugene Kuleshov and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Eugene Kuleshov - initial API and implementation
 *******************************************************************************/

package org.eclipse.mylyn.internal.web.tasks;

import static org.eclipse.mylyn.internal.web.tasks.Util.isPresent;
import static org.eclipse.mylyn.internal.web.tasks.Util.nvl;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.Map;

import org.eclipse.jface.fieldassist.ControlDecoration;
import org.eclipse.jface.layout.GridDataFactory;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.mylyn.tasks.core.RepositoryTemplate;
import org.eclipse.mylyn.tasks.core.TaskRepository;
import org.eclipse.mylyn.tasks.ui.wizards.AbstractRepositorySettingsPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.forms.events.ExpansionAdapter;
import org.eclipse.ui.forms.events.ExpansionEvent;
import org.eclipse.ui.forms.widgets.ExpandableComposite;
import org.eclipse.ui.forms.widgets.FormToolkit;

/**
 * Settings page for generic web-based repository connector
 * 
 * @author Eugene Kuleshov
 */
public class WebRepositorySettingsPage extends AbstractRepositorySettingsPage implements IPropertyChangeListener {

	private static final String TITLE = Messages.WebRepositorySettingsPage_Web_Repository_Settings;

	private static final String DESCRIPTION = Messages.WebRepositorySettingsPage_Select_server_template_example_and_modify_to_match_settings_for_your_project;

	private ParametersEditor parametersEditor;

	private Text taskUrlText;

	private Text newTaskText;

	private Text queryUrlText;

	private ComboViewer queryRequestMethod;

	private Text queryPatternText;

	private Text loginFormUrlText;

	private Text loginTokenPatternText;

	private Text loginRequestUrlText;

	private ComboViewer loginRequestMethod;

	private Map<String, String> oldProperties;

	private final ArrayList<ControlDecoration> decorations = new ArrayList<ControlDecoration>();

	public WebRepositorySettingsPage(TaskRepository taskRepository) {
		super(TITLE, DESCRIPTION, taskRepository);
		setNeedsAnonymousLogin(true);
		setNeedsValidation(false);
		setNeedsHttpAuth(true);
	}

	@Override
	public void dispose() {
		for (ControlDecoration decoration : decorations) {
			decoration.dispose();
		}
		super.dispose();
	}

	@Override
	protected void repositoryTemplateSelected(RepositoryTemplate template) {
		repositoryLabelEditor.setStringValue(template.label);
		setUrl(nvl(template.repositoryUrl));

		taskUrlText.setText(nvl(template.taskPrefixUrl));
		newTaskText.setText(nvl(template.newTaskUrl));

		queryUrlText.setText(nvl(template.taskQueryUrl));
		selectMethod(queryRequestMethod, //
				template.getAttribute(WebRepositoryConnector.PROPERTY_QUERY_METHOD));
		queryPatternText.setText(nvl(template.getAttribute(WebRepositoryConnector.PROPERTY_QUERY_REGEXP)));

		loginRequestUrlText.setText(nvl(template.getAttribute(WebRepositoryConnector.PROPERTY_LOGIN_REQUEST_URL)));
		selectMethod(loginRequestMethod, //
				template.getAttribute(WebRepositoryConnector.PROPERTY_LOGIN_REQUEST_METHOD));
		loginFormUrlText.setText(nvl(template.getAttribute(WebRepositoryConnector.PROPERTY_LOGIN_FORM_URL)));
		loginTokenPatternText.setText(nvl(template.getAttribute(WebRepositoryConnector.PROPERTY_LOGIN_TOKEN_REGEXP)));

		parametersEditor.removeAll();

		for (Map.Entry<String, String> entry : template.getAttributes().entrySet()) {
			String key = entry.getKey();
			if (key.startsWith(WebRepositoryConnector.PARAM_PREFIX)) {
				parametersEditor.add(key.substring(WebRepositoryConnector.PARAM_PREFIX.length()), //
						entry.getValue());
			}
		}

		getContainer().updateButtons();
	}

	@SuppressWarnings("restriction")
	@Override
	protected void createAdditionalControls(Composite parent) {
		addRepositoryTemplatesToServerUrlCombo();

		Composite composite = new Composite(parent, SWT.NONE);
		createParameterEditor(composite);
		createAdvancedComposite(composite);
		GridDataFactory.fillDefaults().grab(true, false).hint(200, SWT.DEFAULT).span(2, SWT.DEFAULT).applyTo(composite);

		if (repository != null) {
			taskUrlText.setText(getTextProperty(WebRepositoryConnector.PROPERTY_TASK_URL));
			newTaskText.setText(getTextProperty(WebRepositoryConnector.PROPERTY_TASK_CREATION_URL));

			selectMethod(queryRequestMethod, getTextProperty(WebRepositoryConnector.PROPERTY_QUERY_METHOD));
			queryUrlText.setText(getTextProperty(WebRepositoryConnector.PROPERTY_QUERY_URL));
			queryPatternText.setText(getTextProperty(WebRepositoryConnector.PROPERTY_QUERY_REGEXP));

			loginFormUrlText.setText(getTextProperty(WebRepositoryConnector.PROPERTY_LOGIN_FORM_URL));
			loginTokenPatternText.setText(getTextProperty(WebRepositoryConnector.PROPERTY_LOGIN_TOKEN_REGEXP));

			selectMethod(loginRequestMethod, getTextProperty(WebRepositoryConnector.PROPERTY_LOGIN_REQUEST_METHOD));
			loginRequestUrlText.setText(getTextProperty(WebRepositoryConnector.PROPERTY_LOGIN_REQUEST_URL));

			oldProperties = repository.getProperties();
			parametersEditor.addParams(oldProperties, new LinkedHashMap<String, String>());
		}
	}

	private void selectMethod(ComboViewer viewer, String method) {
		if (!isPresent(method)) {
			method = WebRepositoryConnector.REQUEST_GET;
		}
		viewer.setSelection(new StructuredSelection(new Object[] { method }), true);
	}

	private String getTextProperty(String name) {
		return nvl(repository.getProperty(name));
	}

	@Override
	protected boolean isValidUrl(String name) {
		return name != null && name.trim().length() > 0;
	}

	private void createParameterEditor(Composite composite) {
		composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
		GridLayout gridLayout = new GridLayout();
		gridLayout.marginBottom = 10;
		gridLayout.verticalSpacing = 0;
		gridLayout.horizontalSpacing = 0;
		gridLayout.marginWidth = 0;
		gridLayout.marginHeight = 0;
		composite.setLayout(gridLayout);

		parametersEditor = new ParametersEditor(composite, SWT.NONE);
		GridData parametersEditorGridData = new GridData(SWT.FILL, SWT.FILL, true, true);
		parametersEditorGridData.minimumHeight = 100;
		parametersEditor.setLayoutData(parametersEditorGridData);
	}

	private void createAdvancedComposite(final Composite composite) {
		FormToolkit toolkit = getToolkit();
		ExpandableComposite expComposite = toolkit.createExpandableComposite(composite, ExpandableComposite.TITLE_BAR
				| ExpandableComposite.COMPACT | ExpandableComposite.TWISTIE);
		expComposite.clientVerticalSpacing = 0;
		GridData gridData_2 = new GridData(SWT.FILL, SWT.TOP, true, false);
		gridData_2.horizontalIndent = -5;
		expComposite.setLayoutData(gridData_2);
		expComposite.setFont(composite.getFont());
		expComposite.setBackground(composite.getBackground());
		expComposite.setText(Messages.WebRepositorySettingsPage_Advanced_Configuration);
		expComposite.addExpansionListener(new ExpansionAdapter() {
			@Override
			public void expansionStateChanged(ExpansionEvent e) {
				getControl().getShell().pack();
			}
		});
		toolkit.paintBordersFor(expComposite);

		Composite composite2 = toolkit.createComposite(expComposite, SWT.BORDER);
		GridLayout gridLayout2 = new GridLayout();
		gridLayout2.numColumns = 3;
		gridLayout2.verticalSpacing = 0;
		composite2.setLayout(gridLayout2);
		expComposite.setClient(composite2);

		Label taskUrlLabel = toolkit.createLabel(composite2, Messages.WebRepositorySettingsPage_Task_URL_, SWT.NONE);
		taskUrlLabel.setLayoutData(new GridData());

		taskUrlText = new Text(composite2, SWT.BORDER);
		taskUrlText.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1));
		decorations.add(WebContentProposalProvider.createDecoration(taskUrlText, parametersEditor, false));

		Label newTaskLabel = toolkit.createLabel(composite2, Messages.WebRepositorySettingsPage_New_Task_URL_, SWT.NONE);
		newTaskLabel.setLayoutData(new GridData());

		newTaskText = new Text(composite2, SWT.BORDER);
		newTaskText.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1));
		decorations.add(WebContentProposalProvider.createDecoration(newTaskText, parametersEditor, false));

		final Label separatorLabel2 = new Label(composite2, SWT.HORIZONTAL | SWT.SEPARATOR);
		final GridData gridData_4 = new GridData(SWT.FILL, SWT.CENTER, false, false, 3, 1);
		gridData_4.verticalIndent = 5;
		gridData_4.heightHint = 5;
		separatorLabel2.setLayoutData(gridData_4);
		toolkit.adapt(separatorLabel2, true, true);

		Label queryUrlLabel = toolkit.createLabel(composite2, Messages.WebRepositorySettingsPage_Query_Request_URL_,
				SWT.NONE);
		queryUrlLabel.setLayoutData(new GridData());

		queryUrlText = new Text(composite2, SWT.BORDER);
		queryUrlText.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
		decorations.add(WebContentProposalProvider.createDecoration(queryUrlText, parametersEditor, false));

		queryRequestMethod = new ComboViewer(composite2, SWT.BORDER | SWT.READ_ONLY);
		queryRequestMethod.setContentProvider(new MethodTypeContentProvider());
		queryRequestMethod.setInput(""); //$NON-NLS-1$
		{
			Combo combo = queryRequestMethod.getCombo();
			toolkit.adapt(combo, true, true);
			combo.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false));
		}

		Label queryPatternLabel = toolkit.createLabel(composite2, Messages.WebRepositorySettingsPage_Query_Pattern_,
				SWT.NONE);
		queryPatternLabel.setLayoutData(new GridData(SWT.LEFT, SWT.FILL, false, true));

		queryPatternText = new Text(composite2, SWT.V_SCROLL | SWT.MULTI | SWT.BORDER | SWT.WRAP);
		GridData gridData = new GridData(SWT.FILL, SWT.FILL, true, true, 2, 1);
		gridData.widthHint = 200;
		gridData.heightHint = 60;
		queryPatternText.setLayoutData(gridData);
		decorations.add(WebContentProposalProvider.createDecoration(queryPatternText, parametersEditor, true));

		final Label separatorLabel1 = new Label(composite2, SWT.HORIZONTAL | SWT.SEPARATOR);
		final GridData gridData_3 = new GridData(SWT.FILL, SWT.CENTER, false, false, 3, 1);
		gridData_3.heightHint = 5;
		gridData_3.verticalIndent = 5;
		separatorLabel1.setLayoutData(gridData_3);
		toolkit.adapt(separatorLabel1, true, true);

		final Label loginrequestUrlLabel = new Label(composite2, SWT.NONE);
		loginrequestUrlLabel.setLayoutData(new GridData());
		toolkit.adapt(loginrequestUrlLabel, true, true);
		loginrequestUrlLabel.setText(Messages.WebRepositorySettingsPage_Login_Request_URL_);

		loginRequestUrlText = new Text(composite2, SWT.BORDER);
		toolkit.adapt(loginRequestUrlText, true, true);
		loginRequestUrlText.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
		decorations.add(WebContentProposalProvider.createDecoration(loginRequestUrlText, parametersEditor, false));

		loginRequestMethod = new ComboViewer(composite2, SWT.BORDER | SWT.READ_ONLY);
		loginRequestMethod.setContentProvider(new MethodTypeContentProvider());
		loginRequestMethod.setInput(""); //$NON-NLS-1$
		{
			Combo combo = loginRequestMethod.getCombo();
			toolkit.adapt(combo, true, true);
			combo.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false));
		}

		Label loginPageLabel = toolkit.createLabel(composite2, Messages.WebRepositorySettingsPage_Login_Form_URL_,
				SWT.NONE);
		loginPageLabel.setLayoutData(new GridData());

		loginFormUrlText = new Text(composite2, SWT.BORDER);
		loginFormUrlText.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 2, 1));
		decorations.add(WebContentProposalProvider.createDecoration(loginFormUrlText, parametersEditor, false));

		Label loginTokenLabel = toolkit.createLabel(composite2, Messages.WebRepositorySettingsPage_Login_Token_Pattern,
				SWT.NONE);
		loginTokenLabel.setLayoutData(new GridData(SWT.LEFT, SWT.FILL, false, true));

		loginTokenPatternText = new Text(composite2, SWT.V_SCROLL | SWT.MULTI | SWT.BORDER | SWT.WRAP);
		final GridData gridData_1 = new GridData(SWT.FILL, SWT.FILL, false, true, 2, 1);
		gridData_1.widthHint = 200;
		gridData_1.heightHint = 30;
		loginTokenPatternText.setLayoutData(gridData_1);
		decorations.add(WebContentProposalProvider.createDecoration(loginTokenPatternText, parametersEditor, true));
	}

	public void propertyChange(PropertyChangeEvent event) {
		Object source = event.getSource();
		if (source == taskUrlText || source == taskUrlText) {
			getWizard().getContainer().updateButtons();
		}
	}

	@Override
	public void applyTo(TaskRepository repository) {
		super.applyTo(repository);
		repository.setProperty(WebRepositoryConnector.PROPERTY_TASK_URL, taskUrlText.getText());
		repository.setProperty(WebRepositoryConnector.PROPERTY_TASK_CREATION_URL, newTaskText.getText());

		repository.setProperty(WebRepositoryConnector.PROPERTY_QUERY_URL, queryUrlText.getText());
		repository.setProperty(WebRepositoryConnector.PROPERTY_QUERY_REGEXP, queryPatternText.getText());
		repository.setProperty(WebRepositoryConnector.PROPERTY_QUERY_METHOD, getSelection(queryRequestMethod));

		String loginRequestUrl = loginRequestUrlText.getText();
		repository.setProperty(WebRepositoryConnector.PROPERTY_LOGIN_REQUEST_URL, loginRequestUrl);
		if (loginRequestUrl.length() > 0) {
			repository.setProperty(WebRepositoryConnector.PROPERTY_LOGIN_REQUEST_METHOD,
					getSelection(loginRequestMethod));
		} else {
			repository.removeProperty(WebRepositoryConnector.PROPERTY_LOGIN_REQUEST_METHOD);
		}
		repository.setProperty(WebRepositoryConnector.PROPERTY_LOGIN_FORM_URL, loginFormUrlText.getText());
		repository.setProperty(WebRepositoryConnector.PROPERTY_LOGIN_TOKEN_REGEXP, loginTokenPatternText.getText());

		if (oldProperties != null) {
			for (Map.Entry<String, String> e : oldProperties.entrySet()) {
				String key = e.getKey();
				if (key.startsWith(WebRepositoryConnector.PARAM_PREFIX)) {
					repository.removeProperty(key);
				}
			}
		}

		for (Map.Entry<String, String> e : parametersEditor.getParameters().entrySet()) {
			repository.setProperty(e.getKey(), e.getValue());
		}
	}

	private String getSelection(ComboViewer viewer) {
		return (String) ((IStructuredSelection) viewer.getSelection()).getFirstElement();
	}

	private static class MethodTypeContentProvider implements IStructuredContentProvider {

		private static final Object[] ELEMENTS = new Object[] { WebRepositoryConnector.REQUEST_GET,
				WebRepositoryConnector.REQUEST_POST };

		public Object[] getElements(Object inputElement) {
			return ELEMENTS;
		}

		public void dispose() {
		}

		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
		}

	}

	@Override
	protected Validator getValidator(TaskRepository repository) {
		return null;
	}

	@Override
	public String getConnectorKind() {
		return WebRepositoryConnector.REPOSITORY_TYPE;
	}

}