/*******************************************************************************
 * Copyright (c) 2004, 2015 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.ui.internal.themes;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import org.eclipse.core.runtime.IConfigurationElement;

/**
 * Concrete implementation of a theme descriptor.
 *
 * @since 3.0
 */
public class ThemeDescriptor implements IThemeDescriptor {

	/* Theme */
	public static final String ATT_ID = "id";//$NON-NLS-1$

	private static final String ATT_NAME = "name";//$NON-NLS-1$

	private Collection<ColorDefinition> colors = new HashSet<>();

	private String description;

	private Collection<FontDefinition> fonts = new HashSet<>();

	private String id;

	private String name;

	private Map<String, Object> dataMap = new HashMap<>();

	/**
	 * Create a new ThemeDescriptor
	 *
	 * @param id
	 */
	public ThemeDescriptor(String id) {
		this.id = id;
	}

	/**
	 * Add a color override to this descriptor.
	 *
	 * @param definition the definition to add
	 */
	void add(ColorDefinition definition) {
		if (colors.contains(definition)) {
			colors.remove(definition);
		}
		colors.add(definition);
	}

	/**
	 * Add a font override to this descriptor.
	 *
	 * @param definition the definition to add
	 */
	void add(FontDefinition definition) {
		if (fonts.contains(definition)) {
			return;
		}
		fonts.add(definition);
	}

	/**
	 * Add a data object to this descriptor.
	 *
	 * @param key  the key
	 * @param data the data
	 */
	void setData(String key, Object data) {
		if (dataMap.containsKey(key)) {
			return;
		}

		dataMap.put(key, data);
	}

	@Override
	public ColorDefinition[] getColors() {
		ColorDefinition[] defs = colors.toArray(new ColorDefinition[colors.size()]);
		Arrays.sort(defs, IThemeRegistry.ID_COMPARATOR);
		return defs;
	}

	@Override
	public String getDescription() {
		return description;
	}

	@Override
	public FontDefinition[] getFonts() {
		FontDefinition[] defs = fonts.toArray(new FontDefinition[fonts.size()]);
		Arrays.sort(defs, IThemeRegistry.ID_COMPARATOR);
		return defs;
	}

	@Override
	public String getId() {
		return id;
	}

	@Override
	public String getName() {
		if (name == null)
			return getId();
		return name;
	}

	/*
	 * load the name if it is not already set.
	 */
	void extractName(IConfigurationElement configElement) {
		if (name == null) {
			name = configElement.getAttribute(ATT_NAME);
		}
	}

	/**
	 * Set the description.
	 *
	 * @param description the description
	 */
	void setDescription(String description) {
		if (this.description == null) {
			this.description = description;
		}
	}

	@Override
	public Map getData() {
		return Collections.unmodifiableMap(dataMap);
	}
}
