/*******************************************************************************
 * Copyright (c) 2005, 2017 IBM Corporation and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 *******************************************************************************/
package org.eclipse.dltk.ui.preferences;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import org.eclipse.dltk.ui.PreferenceConstants;
import org.eclipse.jface.layout.GridLayoutFactory;
import org.eclipse.jface.preference.PreferencePage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;

public class CodeAssistConfigurationBlock extends AbstractConfigurationBlock {
	private final Set<String> optionalPreferences;
	private Button fCompletionInsertsRadioButton;
	private Button fCompletionOverwritesRadioButton;

	public CodeAssistConfigurationBlock(PreferencePage mainPreferencePage,
			OverlayPreferenceStore store, String... optionalPreferences) {
		super(store, mainPreferencePage);
		this.optionalPreferences = new HashSet<>();
		Collections.addAll(this.optionalPreferences, optionalPreferences);
		getPreferenceStore().addKeys(createOverlayStoreKeys());
	}

	private OverlayPreferenceStore.OverlayKey[] createOverlayStoreKeys() {
		ArrayList<OverlayPreferenceStore.OverlayKey> overlayKeys = new ArrayList<>();

		getOverlayKeys(overlayKeys);

		OverlayPreferenceStore.OverlayKey[] keys = new OverlayPreferenceStore.OverlayKey[overlayKeys
				.size()];
		overlayKeys.toArray(keys);
		return keys;
	}

	protected void getOverlayKeys(
			ArrayList<OverlayPreferenceStore.OverlayKey> overlayKeys) {
		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(
				OverlayPreferenceStore.BOOLEAN,
				PreferenceConstants.CODEASSIST_AUTOACTIVATION));
		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(
				OverlayPreferenceStore.INT,
				PreferenceConstants.CODEASSIST_AUTOACTIVATION_DELAY));

		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(
				OverlayPreferenceStore.BOOLEAN,
				PreferenceConstants.CODEASSIST_AUTOINSERT));
		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(
				OverlayPreferenceStore.BOOLEAN,
				PreferenceConstants.CODEASSIST_INSERT_COMPLETION));
		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(
				OverlayPreferenceStore.BOOLEAN,
				PreferenceConstants.CODEASSIST_SORTER));
		if (optionalPreferences.contains(
				PreferenceConstants.CODEASSIST_SHOW_VISIBLE_PROPOSALS)) {
			overlayKeys.add(new OverlayPreferenceStore.OverlayKey(
					OverlayPreferenceStore.BOOLEAN,
					PreferenceConstants.CODEASSIST_SHOW_VISIBLE_PROPOSALS));
		}
	}

	/**
	 * Creates page for appearance preferences.
	 *
	 * @param parent
	 *            the parent composite
	 * @return the control for the preference page
	 */
	@Override
	public Control createControl(Composite parent) {
		initializeDialogUnits(parent);

		Composite control = new Composite(parent, SWT.NONE);
		control.setLayout(new GridLayout());

		Composite composite;

		composite = createSubsection(control, null,
				PreferencesMessages.CodeAssistConfigurationBlock_insertionSection_title);
		final GridLayout layout = GridLayoutFactory.swtDefaults().numColumns(2)
				.create();
		composite.setLayout(layout);
		addInsertionSection(composite);

		if (optionalPreferences.contains(
				PreferenceConstants.CODEASSIST_SHOW_VISIBLE_PROPOSALS)) {
			composite = createSubsection(control, null,
					PreferencesMessages.CodeAssistConfigurationBlock_filteringSection_title);
			composite.setLayout(layout);
			addFilteringSection(composite);
		}

		composite = createSubsection(control, null,
				PreferencesMessages.CodeAssistConfigurationBlock_autoactivationSection_title);
		composite.setLayout(layout);
		addAutoActivationSection(composite);

		// createTabsGroup(control);

		return control;
	}

	// protected void addSortingSection(Composite composite) {
	// String label;
	//
	// label=
	// PreferencesMessages.DLTKEditorPreferencePage_presentProposalsInAlphabeticalOrder;
	// ProposalSorterHandle[] sorters=
	// ProposalSorterRegistry.getDefault().getSorters();
	// String[] labels= new String[sorters.length];
	// String[] values= new String[sorters.length];
	// for (int i= 0; i < sorters.length; i++) {
	// ProposalSorterHandle handle= sorters[i];
	// labels[i]= handle.getName();
	// values[i]= handle.getId();
	// }
	//
	// addComboBox(composite, label, PreferenceConstants.CODEASSIST_SORTER,
	// values, labels);
	// }

	private Control autoActivation;

	protected void addAutoActivationSection(Composite composite) {
		final Button autoactivation = addCheckBox(composite,
				PreferencesMessages.DLTKEditorPreferencePage_enableAutoActivation,
				PreferenceConstants.CODEASSIST_AUTOACTIVATION, 2);
		autoactivation.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				updateAutoactivationControls();
			}
		});

		Control[] ctrl = addLabelledTextField(composite,
				PreferencesMessages.DLTKEditorPreferencePage_autoActivationDelay,
				PreferenceConstants.CODEASSIST_AUTOACTIVATION_DELAY, 4, 2,
				true);
		autoActivation = ctrl[1];
	}

	private void updateAutoactivationControls() {
		boolean autoactivation = getPreferenceStore()
				.getBoolean(PreferenceConstants.CODEASSIST_AUTOACTIVATION);
		if (autoActivation != null) {
			autoActivation.setEnabled(autoactivation);
		}
	}

	protected void addInsertionSection(Composite composite) {
		addCompletionRadioButtons(composite);

		addCheckBox(composite,
				PreferencesMessages.DLTKEditorPreferencePage_insertSingleProposalsAutomatically,
				PreferenceConstants.CODEASSIST_AUTOINSERT, 2);
	}

	protected void addCompletionRadioButtons(Composite contentAssistComposite) {
		Composite completionComposite = new Composite(contentAssistComposite,
				SWT.NONE);
		GridData ccgd = new GridData();
		ccgd.horizontalSpan = 2;
		completionComposite.setLayoutData(ccgd);
		GridLayout ccgl = new GridLayout();
		ccgl.marginWidth = 0;
		ccgl.numColumns = 2;
		completionComposite.setLayout(ccgl);

		SelectionListener completionSelectionListener = new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				boolean insert = fCompletionInsertsRadioButton.getSelection();
				getPreferenceStore().setValue(
						PreferenceConstants.CODEASSIST_INSERT_COMPLETION,
						insert);
			}
		};

		fCompletionInsertsRadioButton = new Button(completionComposite,
				SWT.RADIO | SWT.LEFT);
		fCompletionInsertsRadioButton.setText(
				PreferencesMessages.DLTKEditorPreferencePage_completionInserts);
		fCompletionInsertsRadioButton.setLayoutData(new GridData());
		fCompletionInsertsRadioButton
				.addSelectionListener(completionSelectionListener);

		fCompletionOverwritesRadioButton = new Button(completionComposite,
				SWT.RADIO | SWT.LEFT);
		fCompletionOverwritesRadioButton.setText(
				PreferencesMessages.DLTKEditorPreferencePage_completionOverwrites);
		fCompletionOverwritesRadioButton.setLayoutData(new GridData());
		fCompletionOverwritesRadioButton
				.addSelectionListener(completionSelectionListener);

		Label label = new Label(completionComposite, SWT.NONE);
		label.setText(
				PreferencesMessages.DLTKEditorPreferencePage_completionToggleHint);
		GridData gd = new GridData();
		gd.horizontalIndent = 20;
		gd.horizontalSpan = 2;
		label.setLayoutData(gd);
	}

	protected void addFilteringSection(Composite composite) {
		addCheckBox(composite,
				PreferencesMessages.DLTKEditorPreferencePage_showOnlyProposalsVisibleInTheInvocationContext,
				PreferenceConstants.CODEASSIST_SHOW_VISIBLE_PROPOSALS, 2);
	}

	@Override
	protected void initializeFields() {
		super.initializeFields();
		boolean completionInserts = getPreferenceStore()
				.getBoolean(PreferenceConstants.CODEASSIST_INSERT_COMPLETION);
		fCompletionInsertsRadioButton.setSelection(completionInserts);
		fCompletionOverwritesRadioButton.setSelection(!completionInserts);

		updateAutoactivationControls();
	}
}