/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

*/

package com.nokia.carbide.cpp.internal.api.sdk;

import java.io.File;

import java.io.FileFilter;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import org.eclipse.cdt.utils.spawner.EnvironmentReader;

import org.eclipse.core.filesystem.URIUtil;

import org.osgi.framework.Version;

import org.xml.sax.InputSource;

import org.xml.sax.helpers.DefaultHandler;

/**

 * Utility class for SBSv2

 * @since 2.0

 */

public class SBSv2Utils {

	private static final String SBSV2_FILTERED_CONFIGS_STORE = "sbsv2FilteredConfigs"; //$NON-NLS-1$

	private static final String SBSV2_FILTERED_CONFIGS_DELIMETER = ";"; //$NON-NLS-1$

	private static List<String> unfilteredSBSv2ConfigNames;

	/**

     * Get the path to the SBSv2 bin directory.  This is based on the SBS_HOME environment variable

     * and may or may not actually exist.

     * @return absolute path to the bin directory, or null if SBS_HOME is not set

     */

    public static IPath getSBSBinDirectory() {

    	String sbsHome = EnvironmentReader.getEnvVar("SBS_HOME"); //$NON-NLS-1$

    	if (sbsHome != null) {

    		return new Path(sbsHome).append("bin"); //$NON-NLS-1$

    	}

    	return null;

    }

    /**

     * Get the build configurations supported by SBSv2

     * @param refreshList whether or not to parse the configuration xml files again

     * @return list of configuration names, never null

     */

    public static List<String> getUnfilteredSBSv2BuildConfigurations(boolean refreshList) {

    	if (unfilteredSBSv2ConfigNames == null || refreshList) {

    		unfilteredSBSv2ConfigNames = new ArrayList<String>();

        	// parse the xml files in SBS_HOME/lib/config/ to get SBSv2 configs

    		try {

    			IPath configPath = getSBSBinDirectory();

    			if (configPath != null) {

    				configPath = configPath.removeLastSegments(1).append("lib/config"); //$NON-NLS-1$

    				File configDir = configPath.toFile();

    				if (configDir.exists() && configDir.isDirectory()) {

    					File[] configFiles = FileUtils.listFilesInTree(configDir, new FileFilter() {

    						public boolean accept(File arg0) {

    							if (arg0.isDirectory()) {

    								return true;

    							}

    							return arg0.getName().toLowerCase().endsWith("xml"); //$NON-NLS-1$

    						}

    					}, false);

    					for (File file : configFiles) {

    						getConfigsForFile(file);

    					}

    				}

    			}

    		} catch (Exception e) {

        		e.printStackTrace();

        		Logging.log(SDKCorePlugin.getDefault(), Logging.newStatus(SDKCorePlugin.getDefault(), e));

    		}

    	}

    	return unfilteredSBSv2ConfigNames;

	}

    /**

     * Given a list of SDKs, returns the list of the SDK's supported by SBSv2

     * @param sdks list of SDK's to check

     * @return list of SBSv2 supported SDK's, may be empty

     */

    public static List<ISymbianSDK> getSupportedSDKs(List<ISymbianSDK> sdks) {

    	List<ISymbianSDK> supportedSDKs = new ArrayList<ISymbianSDK>();

    	//TODO need a better way to do this from Symbian.

    	// For now, just filter out anything older than 9.4

    	for (ISymbianSDK sdk : sdks) {

    		Version osVersion = sdk.getOSVersion();

    		if (osVersion.getMajor() > 8 && osVersion.getMinor() > 3) {

    			supportedSDKs.add(sdk);

    		}

    	}

    	return supportedSDKs;

    }

	/**

	 * Returns the list of SBSv2 build configuration names that should

	 * be filtered out of any UI

	 */

	public static String[] getSBSv2ConfigurationsToFilter() {

		Preferences prefs = SDKCorePlugin.getDefault().getPluginPreferences();

		if (prefs != null) {

			String configs = prefs.getString(SBSV2_FILTERED_CONFIGS_STORE);

			return configs.split(SBSV2_FILTERED_CONFIGS_DELIMETER);

		}

		return new String[0];

	}

	/**

	 * Set the list of SBSv2 build configurations that should be filtered

	 * out of any UI

	 * @param configs configs to be filtered

	 */

	public static void setSBSv2ConfigurationsToFilter(String[] configs) {

		Preferences prefs = SDKCorePlugin.getDefault().getPluginPreferences();

		if (prefs != null) {

			String store = ""; //$NON-NLS-1$

			for (String config : configs) {

				store = store + SBSV2_FILTERED_CONFIGS_DELIMETER + config;

			}

			// remove the leading delimeter

			if (store.length() > 0) {

				store = store.substring(1);

				prefs.setValue(SBSV2_FILTERED_CONFIGS_STORE, store);

				SDKCorePlugin.getDefault().savePluginPreferences();

			}

		}

	}

	/**

	 * Gets the list of SBSv2 build contexts for the given SDK

	 * @param sdk the SDK to get the build contexts for

	 * @return the list of SBSv2 build contexts.  the list may be empty

	 */

	public static List<ISymbianBuildContext> getFilteredSBSv2BuildContexts(ISymbianSDK sdk) {

		List<ISymbianBuildContext> contexts = new ArrayList<ISymbianBuildContext>();

		for (String name : getUnfilteredSBSv2BuildConfigurations(false)) {

			boolean addConfig = true;

			for (String filteredConfig : getSBSv2ConfigurationsToFilter()) {

				if (filteredConfig.compareTo(name) == 0) {

					addConfig = false;

					break;

				}

			}

			if (addConfig) {

				// only support configs that fall into something we can make a build context

				// out of.  They must have a platform and a target.

				String targetString = null;

		    	if (name.toLowerCase().endsWith("_udeb") || name.toLowerCase().endsWith("_deb")) { //$NON-NLS-1$ //$NON-NLS-2$

		    		targetString = ISymbianBuildContext.DEBUG_TARGET;

		    	} else if (name.toLowerCase().endsWith("_urel") || name.toLowerCase().endsWith("_rel")) { //$NON-NLS-1$ //$NON-NLS-2$

		    		targetString = ISymbianBuildContext.RELEASE_TARGET;

		    	}

		    	if (targetString != null) {

		    		String[] parts = name.split("_"); //$NON-NLS-1$

		    		if (parts.length == 2) {

		    			SymbianBuildContext context = new SymbianBuildContext(sdk, parts[0].toUpperCase(), targetString);

		    			contexts.add(context);

		    		}

		    	}

			}

		}

		Collections.sort(contexts, new Comparator<ISymbianBuildContext>() {

			public int compare(ISymbianBuildContext o1, ISymbianBuildContext o2) {

				String platform1 = o1.getPlatformString();

				String platform2 = o2.getPlatformString();

				if (platform1.equals(platform2)) {

					return o1.getTargetString().compareTo(o2.getTargetString());

				} else {

					if (platform1.equals(ISymbianBuildContext.EMULATOR_PLATFORM)) {

						return -1;

					}

					else if (platform2.equals(ISymbianBuildContext.EMULATOR_PLATFORM)) {

						return 1;

					}

				}

				return 0;

			}

		});

		return contexts;

	}

	/**

	 * Whether or not to display SBSv2 builder UI

	 * @return true if SBSv2 is installed, false otherwise

	 */

	public static boolean enableSBSv2Support() {

		IPath sbsBinPath = getSBSBinDirectory();

		if (sbsBinPath != null && sbsBinPath.toFile().exists()) {

			return true;

		}

		return false;

	}

	private static void getConfigsForFile(File file) {

    	try {

    		Element root = null;

    		DocumentBuilder parser = DocumentBuilderFactory.newInstance().newDocumentBuilder();

    		parser.setErrorHandler(new DefaultHandler());

    		InputSource source = new InputSource(URIUtil.toURI(file.getAbsolutePath()).getPath());

    		root = parser.parse(source).getDocumentElement();

    		NodeList children = root.getChildNodes();

    		for (int i=0; i< children.getLength(); i++) {

    			getConfigsForNode(children.item(i));

    		}

    	} catch (Exception e) {

    		e.printStackTrace();

    		Logging.log(SDKCorePlugin.getDefault(), Logging.newStatus(SDKCorePlugin.getDefault(), e));

    	}

    }

    private static void getConfigsForNode(Node node) {

		if (node.getNodeName().equals("config")) { //$NON-NLS-1$

			Node abstractNode = node.getAttributes().getNamedItem("abstract");  //$NON-NLS-1$

			if (abstractNode == null || abstractNode.getNodeValue().equals("false")) { //$NON-NLS-1$

				Node namedNode = node.getAttributes().getNamedItem("name"); //$NON-NLS-1$

				if (namedNode != null) {

					// only support configs that fall into something we can make a build context

					// out of.  They must have a platform and a target.

					String configName = namedNode.getNodeValue();

			    	if (configName.toLowerCase().endsWith("_udeb") || configName.toLowerCase().endsWith("_deb") || //$NON-NLS-1$ //$NON-NLS-2$

		    			configName.toLowerCase().endsWith("_urel") || configName.toLowerCase().endsWith("_rel")) { //$NON-NLS-1$ //$NON-NLS-2$

			    		if (configName.split("_").length == 2) { //$NON-NLS-1$

							unfilteredSBSv2ConfigNames.add(configName);

			    		}

			    	}

				}

			}

			NodeList children = node.getChildNodes();

			for (int i=0; i< children.getLength(); i++) {

				getConfigsForNode(children.item(i));

			}

		}

    }

}