/*

* 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 java.text.MessageFormat;

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.eclipse.core.runtime.preferences.IEclipsePreferences;

import org.eclipse.core.runtime.preferences.InstanceScope;

import org.osgi.framework.Version;

import org.osgi.service.prefs.BackingStoreException;

import org.xml.sax.InputSource;

import org.xml.sax.helpers.DefaultHandler;

import com.nokia.cpp.internal.api.utils.core.FileUtils;

import com.nokia.cpp.internal.api.utils.core.HostOS;

import com.nokia.cpp.internal.api.utils.core.Logging;

/**

 * 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 = ";"; //$NON-NLS-1$

	protected static final String SBS_HOME = "SBS_HOME";

	protected static String sbsHome;

	protected static IPath sbsPath;

	private static boolean scannedSbsState = false;

	private static final String sbsScriptName = HostOS.IS_WIN32 ? "sbs.bat" : "sbs"; 

	/**

     * 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

     */

    	if (unfilteredSBSv2ConfigNames == null || refreshList) {

        	// 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>();

    	// If there is no SBSv1 builder, then assume all SDKs are SBSv2 capable

    	if (!enableSBSv1Support()) {

    		supportedSDKs.addAll(sdks);

    	} else {

	    	//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.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() {

		IEclipsePreferences prefs = new InstanceScope().getNode(SDKCorePlugin.PLUGIN_ID);

		if (prefs != null) {

			String configs = prefs.get(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) {

		IEclipsePreferences prefs = new InstanceScope().getNode(SDKCorePlugin.PLUGIN_ID);

		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);

			}

			if (store.length() >= 0){

				// lenght of zero means there are not configs to filter (or show them all)

				prefs.put(SBSV2_FILTERED_CONFIGS_STORE, store);

				try {

					prefs.flush();

				} catch (BackingStoreException e) {

					Logging.log(SDKCorePlugin.getDefault(),

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

				}

			}

		}

	}

	/**

	 * 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>();

			boolean addConfig = true;

			for (String filteredConfig : getSBSv2ConfigurationsToFilter()) {

					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;

		    		targetString = ISymbianBuildContext.DEBUG_TARGET;

		    		targetString = ISymbianBuildContext.RELEASE_TARGET;

		    	}

		    	if (targetString != null) {

		    			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 SBSv1 builder UI

	 * @return true if SBSv1 is available, false otherwise

	 */

	public static boolean enableSBSv1Support() {

		if (!enableSBSv2Support())

			return true;

		// TODO LINUX: more accurate check

		if (HostOS.IS_WIN32)

			return true;

		return false;

	}

	/**

	 * 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++) {

    		}

    	} catch (Exception e) {

    		e.printStackTrace();

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

    	}

    }

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

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

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

				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();

			    		}

			    	}

			}

			NodeList children = node.getChildNodes();

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

			}

		}

    }

	/**

	 * (Re-)scan the SBSv2 / Raptor configuration

	 * @return message if error, else null

	 */

	public static String scanSBSv2() {

		// do some basic checks

		sbsHome = System.getenv(SBS_HOME);

		if (sbsHome == null) {

			return Messages.getString("SBSv2Utils.DefineSBS_HOMEMessage"); //$NON-NLS-1$

		}

		IPath expectedPath = new Path(sbsHome).append("bin").append(sbsScriptName);

		if (expectedPath.toFile().exists()) {

			sbsPath = expectedPath;

		} else {

			sbsPath = HostOS.findProgramOnPath(sbsScriptName, null);

			if (sbsPath == null) {

				return MessageFormat.format(

								Messages.getString("SBSv2Utils.CannotFindSBSScriptError"), //$NON-NLS-1$

								sbsScriptName);

			}

		}

		return null;

	}

    /**

     * Get the path to SBSv2 (sbs.bat or sbs)

     */

	public static IPath getSBSPath() {

		if (!scannedSbsState) {

			scanSBSv2();

			scannedSbsState = true;

		}

		return sbsPath != null ? sbsPath : new Path(sbsScriptName);  // dummy

	}

}