/*******************************************************************************
 * Copyright (c) 2006, 2013 Oracle. All rights reserved.
 * 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/.
 *
 * Contributors:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.jpa.eclipselink.ui.internal.details;

import java.util.ArrayList;
import org.eclipse.jpt.common.ui.JptCommonUiMessages;
import org.eclipse.jpt.common.ui.internal.swt.widgets.ComboTools;
import org.eclipse.jpt.common.ui.internal.widgets.Pane;
import org.eclipse.jpt.common.utility.internal.StringTools;
import org.eclipse.jpt.common.utility.internal.model.value.CollectionAspectAdapter;
import org.eclipse.jpt.common.utility.internal.model.value.CompositeListValueModel;
import org.eclipse.jpt.common.utility.internal.model.value.FilteringCollectionValueModel;
import org.eclipse.jpt.common.utility.internal.model.value.ItemPropertyListValueModelAdapter;
import org.eclipse.jpt.common.utility.internal.model.value.PropertyAspectAdapter;
import org.eclipse.jpt.common.utility.internal.model.value.PropertyListValueModelAdapter;
import org.eclipse.jpt.common.utility.internal.model.value.SetCollectionValueModel;
import org.eclipse.jpt.common.utility.internal.model.value.SortedListValueModelAdapter;
import org.eclipse.jpt.common.utility.internal.model.value.StaticListValueModel;
import org.eclipse.jpt.common.utility.internal.model.value.TransformationListValueModel;
import org.eclipse.jpt.common.utility.internal.transformer.TransformerAdapter;
import org.eclipse.jpt.common.utility.model.value.CollectionValueModel;
import org.eclipse.jpt.common.utility.model.value.ListValueModel;
import org.eclipse.jpt.common.utility.model.value.ModifiablePropertyValueModel;
import org.eclipse.jpt.common.utility.model.value.PropertyValueModel;
import org.eclipse.jpt.common.utility.transformer.Transformer;
import org.eclipse.jpt.jpa.core.context.JpaNamedContextModel;
import org.eclipse.jpt.jpa.eclipselink.core.context.EclipseLinkConvert;
import org.eclipse.jpt.jpa.eclipselink.core.context.EclipseLinkConverter;
import org.eclipse.jpt.jpa.eclipselink.core.context.persistence.EclipseLinkPersistenceUnit;
import org.eclipse.osgi.util.NLS;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;

public class EclipseLinkConvertCombo
	extends Pane<EclipseLinkConvert>
{

	private Combo combo;

	/**
	 * A key used to represent the default value, this is required to convert
	 * the selected item from a combo to an empty string. This key is most
	 * likely never typed the user and it will help to convert the value to
	 * an empty string when it's time to set the new selected value into the
	 * model.
	 */
	protected static String DEFAULT_KEY = "?!#!?#?#?default?#?!#?!#?"; //$NON-NLS-1$


	public EclipseLinkConvertCombo(
		Pane<?> parentPane,
		PropertyValueModel<? extends EclipseLinkConvert> subjectModel,
		PropertyValueModel<Boolean> enabledModel,
		Composite parentComposite
	) {
		super(parentPane, subjectModel, enabledModel, parentComposite);
	}

	@Override
	protected boolean addsComposite() {
		return false;
	}

	@Override
	public Combo getControl() {
		return this.combo;
	}

	@Override
	protected void initializeLayout(Composite container) {
		this.combo = this.addEditableCombo(
			container,
			buildConvertNameListHolder(),
			buildConvertNameHolder(),
			buildConverterNameTransformer(),
			(String) null
		);
		ComboTools.handleDefaultValue(this.combo);
	}

	protected final ModifiablePropertyValueModel<String> buildConvertNameHolder() {
		return new PropertyAspectAdapter<EclipseLinkConvert, String>(getSubjectHolder(), EclipseLinkConvert.SPECIFIED_CONVERTER_NAME_PROPERTY) {
			@Override
			protected String buildValue_() {
				return this.subject.getSpecifiedConverterName();
			}

			@Override
			protected void setValue_(String value) {
				// Convert the default value to the default converter
				if ((value != null) && (value.startsWith(DEFAULT_KEY))) {
					value = EclipseLinkConvert.DEFAULT_CONVERTER_NAME;
				}
				this.subject.setSpecifiedConverterName(value);
			}
		};
	}

	private ListValueModel<String> buildConvertNameListHolder() {
		java.util.List<ListValueModel<String>> list = new ArrayList<ListValueModel<String>>();
		list.add(buildDefaultNameListHolder());
		list.add(buildReservedConverterNameListHolder());
		list.add(buildSortedConverterNamesModel());
		return CompositeListValueModel.forModels(list);
	}

	protected ListValueModel<String> buildDefaultNameListHolder() {
		return new PropertyListValueModelAdapter<String>(
			buildDefaultNameHolder()
		);
	}

	private ModifiablePropertyValueModel<String> buildDefaultNameHolder() {
		return new PropertyAspectAdapter<EclipseLinkConvert, String>(getSubjectHolder(), EclipseLinkConvert.DEFAULT_CONVERTER_NAME_PROPERTY) {
			@Override
			protected String buildValue_() {
				String name = this.subject.getDefaultConverterName();

				if (name == null) {
					name = DEFAULT_KEY;
				}
				else {
					name = DEFAULT_KEY + name;
				}

				return name;
			}
		};
	}

	private Transformer<String, String> buildConverterNameTransformer() {
		return new ConverterNameTransformer();
	}

	class ConverterNameTransformer
		extends TransformerAdapter<String, String>
	{
		@Override
		public String transform(String value) {

			if (EclipseLinkConvertCombo.this.getSubject() == null) {
				return value;
			}

			if (value == null) {
				value = EclipseLinkConvertCombo.this.getSubject().getDefaultConverterName();

				if (value != null) {
					value = DEFAULT_KEY + value;
				}
				else {
					value = DEFAULT_KEY;
				}
			}

			if (value.startsWith(DEFAULT_KEY)) {
				String defaultName = value.substring(DEFAULT_KEY.length());

				if (defaultName.length() > 0) {
					value = NLS.bind(
						JptCommonUiMessages.DEFAULT_WITH_ONE_PARAM,
						defaultName
					);
				}
				else {
					value = NLS.bind(
						JptCommonUiMessages.DEFAULT_WITH_ONE_PARAM,
						EclipseLinkConvert.NO_CONVERTER
					);
				}
			}

			return value;
		}
	}

	protected ListValueModel<String> buildReservedConverterNameListHolder() {
		return new StaticListValueModel<String>(EclipseLinkConvert.RESERVED_CONVERTER_NAMES);
	}

	protected ListValueModel<String> buildSortedConverterNamesModel() {
		return new SortedListValueModelAdapter<String>(this.buildUniqueConverterNamesModel());
	}

	protected CollectionValueModel<String> buildUniqueConverterNamesModel() {
		return new SetCollectionValueModel<String>(this.buildConverterNamesModel());
	}

	protected CollectionValueModel<String> buildConverterNamesModel() {
		return new FilteringCollectionValueModel<String>(this.buildConverterNamesModel_(), StringTools.IS_NOT_BLANK);
	}

	protected ListValueModel<String> buildConverterNamesModel_() {
		return new TransformationListValueModel<EclipseLinkConverter, String>(this.buildConvertersModel()) {
			@Override
			protected String transformItem_(EclipseLinkConverter converter) {
				return converter.getName();
			}
		};
	}

	protected ListValueModel<EclipseLinkConverter> buildConvertersModel() {
		return new ItemPropertyListValueModelAdapter<EclipseLinkConverter>(this.buildConvertersModel_(), JpaNamedContextModel.NAME_PROPERTY);
	}

	protected CollectionValueModel<EclipseLinkConverter> buildConvertersModel_() {
		return new CollectionAspectAdapter<EclipseLinkPersistenceUnit, EclipseLinkConverter>(this.buildPersistenceUnitHolder(), EclipseLinkPersistenceUnit.CONVERTERS_COLLECTION) {
			@Override
			protected Iterable<EclipseLinkConverter> getIterable() {
				return this.subject.getConverters();
			}
			@Override
			protected int size_() {
				return this.subject.getConvertersSize();
			}
		};
	}

	protected PropertyValueModel<EclipseLinkPersistenceUnit> buildPersistenceUnitHolder() {
		return new PropertyAspectAdapter<EclipseLinkConvert, EclipseLinkPersistenceUnit>(getSubjectHolder()) {
			@Override
			protected EclipseLinkPersistenceUnit buildValue_() {
				return this.subject.getPersistenceUnit();
			}
		};
	}
}