Copyright (c) 2005, 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
/*******************************************************************************
 * Copyright (c) 2005, 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.core.internal.preferences.legacy;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Properties;
import org.eclipse.core.internal.preferences.exchange.IProductPreferencesService;
import org.eclipse.core.internal.runtime.InternalPlatform;
import org.eclipse.core.runtime.*;
import org.osgi.framework.Bundle;

public class ProductPreferencesService implements IProductPreferencesService {

	private static final IPath NL_DIR = new Path("$nl$"); //$NON-NLS-1$

	// declared in org.eclipse.ui.branding.IProductConstants
	public static final String PRODUCT_KEY = "preferenceCustomization"; //$NON-NLS-1$
	private static final String LEGACY_PRODUCT_CUSTOMIZATION_FILENAME = "plugin_customization.ini"; //$NON-NLS-1$
	private static final String PROPERTIES_FILE_EXTENSION = "properties"; //$NON-NLS-1$

	private boolean initialized = false;
	private String customizationValue = null; // it won't change during the product run time
	private Bundle customizationBundle = null;
	private String productID = null;

	private void initValues() {
		if (initialized)
			return;
		initialized = true;

		IProduct product = Platform.getProduct();
		if (product == null) {
			if (InternalPlatform.DEBUG_PLUGIN_PREFERENCES)
				InternalPlatform.message("Product not available to set product default preference overrides."); //$NON-NLS-1$
			return;
		}
		productID = product.getId();
		if (productID == null) {
			if (InternalPlatform.DEBUG_PLUGIN_PREFERENCES)
				InternalPlatform.message("Product ID not available to apply product-level preference defaults."); //$NON-NLS-1$
			return;
		}
		customizationBundle = product.getDefiningBundle();
		if (customizationBundle == null) {
			if (InternalPlatform.DEBUG_PLUGIN_PREFERENCES)
				InternalPlatform.message("Bundle not available to apply product-level preference defaults for product id: " + productID); //$NON-NLS-1$
			return;
		}
		customizationValue = product.getProperty(PRODUCT_KEY);
		if (customizationValue == null) {
			if (InternalPlatform.DEBUG_PLUGIN_PREFERENCES)
				InternalPlatform.message("Product : " + productID + " does not define preference customization file. Using legacy file: plugin_customization.ini"); //$NON-NLS-1$//$NON-NLS-2$
			customizationValue = LEGACY_PRODUCT_CUSTOMIZATION_FILENAME;
		}
	}

	@Override
	public Properties getProductCustomization() {
		initValues();
		URL url = null;
		if (customizationValue != null) {
			// try to convert the key to a URL
			try {
				url = new URL(customizationValue);
			} catch (MalformedURLException e) {
				// didn't work so treat it as a filename
				url = FileLocator.find(customizationBundle, new Path(customizationValue), null);
			}
		}

		if (url == null) {
			if (InternalPlatform.DEBUG_PLUGIN_PREFERENCES)
				InternalPlatform.message("Product preference customization file: " + customizationValue + " not found for bundle: " + productID); //$NON-NLS-1$//$NON-NLS-2$
		}

		return loadProperties(url);
	}

	@Override
	public Properties getProductTranslation() {
		initValues();
		URL transURL = null;

		if (customizationValue != null)
			transURL = FileLocator.find(customizationBundle, NL_DIR.append(customizationValue).removeFileExtension().addFileExtension(PROPERTIES_FILE_EXTENSION), null);

		if (transURL == null && InternalPlatform.DEBUG_PLUGIN_PREFERENCES)
			InternalPlatform.message("No preference translations found for product/file: " + customizationBundle.getSymbolicName() + '/' + customizationValue); //$NON-NLS-1$

		return loadProperties(transURL);
	}

	private Properties loadProperties(URL url) {
		Properties result = new Properties();
		if (url == null)
			return result;
		InputStream input = null;
		try {
			input = url.openStream();
			result.load(input);
		} catch (IOException e) {
			if (InternalPlatform.DEBUG_PLUGIN_PREFERENCES) {
				InternalPlatform.message("Problem opening stream to preference customization file: " + url); //$NON-NLS-1$
				e.printStackTrace();
			}
		} finally {
			if (input != null)
				try {
					input.close();
				} catch (IOException e) {
					// ignore
				}
		}
		return result;
	}

}