/*******************************************************************************
 * Copyright (c) 2006, 2011 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.ui.preferences;

import java.util.ArrayList;
import java.util.Arrays;

import java.text.Collator;

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;

import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.preferences.IScopeContext;

import org.eclipse.jface.preference.IPreferencePageContainer;
import org.eclipse.jface.preference.PreferencePage;

import org.eclipse.jdt.internal.ui.JavaPlugin;
import org.eclipse.jdt.internal.ui.javaeditor.saveparticipant.ISaveParticipantPreferenceConfiguration;
import org.eclipse.jdt.internal.ui.javaeditor.saveparticipant.SaveParticipantDescriptor;
import org.eclipse.jdt.internal.ui.javaeditor.saveparticipant.SaveParticipantRegistry;

/**
 * Configures Java Editor save participants.
 *
 * @since 3.3
 */
class SaveParticipantConfigurationBlock implements IPreferenceAndPropertyConfigurationBlock {

	private interface IDelegateOperation {
		void run(ISaveParticipantPreferenceConfiguration block);
	}

	private final PreferencePage fPreferencePage;
	private final IScopeContext fContext;
	private final ArrayList<ISaveParticipantPreferenceConfiguration> fConfigurations;

	public SaveParticipantConfigurationBlock(IScopeContext context, PreferencePage preferencePage) {
		Assert.isNotNull(context);
		Assert.isNotNull(preferencePage);

		fContext= context;
		fPreferencePage= preferencePage;
		fConfigurations= new ArrayList<>();
	}

	/*
	 * @see org.eclipse.jdt.internal.ui.preferences.IPreferenceConfigurationBlock#createControl(org.eclipse.swt.widgets.Composite)
	 * @since 3.3
	 */
	@Override
	public Control createControl(Composite parent) {
		Composite composite= new Composite(parent, SWT.NONE);
		composite.setLayoutData(new GridData(SWT.FILL, SWT.TOP, true, false));
    	GridLayout gridLayout= new GridLayout(2, false);
    	gridLayout.marginHeight= 0;
    	gridLayout.marginWidth= 0;
		composite.setLayout(gridLayout);

		SaveParticipantRegistry registry= JavaPlugin.getDefault().getSaveParticipantRegistry();
		SaveParticipantDescriptor[] descriptors= registry.getSaveParticipantDescriptors();

		if (descriptors.length == 0)
			return composite;

		Arrays.sort(descriptors, (d1, d2) -> Collator.getInstance().compare(d1.getPostSaveListener().getName(), d2.getPostSaveListener().getName()));

		IPreferencePageContainer container= fPreferencePage.getContainer();
		for (SaveParticipantDescriptor descriptor : descriptors) {
			ISaveParticipantPreferenceConfiguration configuration= descriptor.createPreferenceConfiguration();
			configuration.createControl(composite, container);
			fConfigurations.add(configuration);
		}

		return composite;
	}

	/*
	 * @see org.eclipse.jdt.internal.ui.preferences.IPreferenceConfigurationBlock#dispose()
	 */
	@Override
	public void dispose() {
		delegateToPreferenceConfiguration(ISaveParticipantPreferenceConfiguration::dispose);
	}

	/*
	 * @see org.eclipse.jdt.internal.ui.preferences.IPreferenceConfigurationBlock#initialize()
	 */
	@Override
	public void initialize() {
		delegateToPreferenceConfiguration(block -> {
			IAdaptable element= null;
			if (fPreferencePage instanceof PropertyAndPreferencePage) {
				element= ((PropertyAndPreferencePage)fPreferencePage).getElement();
			}
			block.initialize(fContext, element);
		});
	}

	/*
	 * @see org.eclipse.jdt.internal.ui.preferences.IPreferenceConfigurationBlock#performDefaults()
	 */
	@Override
	public void performDefaults() {
		delegateToPreferenceConfiguration(ISaveParticipantPreferenceConfiguration::performDefaults);
	}

	/*
	 * @see org.eclipse.jdt.internal.ui.preferences.IPreferenceConfigurationBlock#performOk()
	 */
	@Override
	public void performOk() {
		delegateToPreferenceConfiguration(ISaveParticipantPreferenceConfiguration::performOk);
	}

	@Override
	public void enableProjectSettings() {
		delegateToPreferenceConfiguration(ISaveParticipantPreferenceConfiguration::enableProjectSettings);
	}

	@Override
	public void disableProjectSettings() {
		delegateToPreferenceConfiguration(ISaveParticipantPreferenceConfiguration::disableProjectSettings);
	}

	private void delegateToPreferenceConfiguration(IDelegateOperation op) {
		for (ISaveParticipantPreferenceConfiguration block : fConfigurations) {
	        op.run(block);
        }
	}
}
