/*

* 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.sdk.core.model;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.Serializable;

import java.text.MessageFormat;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import org.eclipse.core.resources.ResourcesPlugin;

import org.eclipse.core.runtime.CoreException;

import org.eclipse.core.runtime.IConfigurationElement;

import org.eclipse.core.runtime.IExtension;

import org.eclipse.core.runtime.IExtensionPoint;

import org.eclipse.core.runtime.IExtensionRegistry;

import org.eclipse.core.runtime.IPath;

import org.eclipse.core.runtime.IProgressMonitor;

import org.eclipse.core.runtime.IStatus;

import org.eclipse.core.runtime.NullProgressMonitor;

import org.eclipse.core.runtime.Platform;

import org.eclipse.core.runtime.Status;

import org.eclipse.core.runtime.jobs.IJobChangeEvent;

import org.eclipse.core.runtime.jobs.IJobChangeListener;

import org.eclipse.core.runtime.jobs.Job;

import org.osgi.framework.Version;

import com.nokia.carbide.cpp.internal.api.sdk.BuildPlat;

import com.nokia.carbide.cpp.internal.api.sdk.ICarbideDevicesXMLChangeListener;

import com.nokia.carbide.cpp.internal.api.sdk.ISDKManagerInternal;

import com.nokia.carbide.cpp.internal.api.sdk.ISDKManagerLoadedHook;

import com.nokia.carbide.cpp.internal.api.sdk.SBSv2Utils;

import com.nokia.carbide.cpp.internal.api.sdk.SDKCacheUtils;

import com.nokia.carbide.cpp.internal.api.sdk.SDKManagerInternalAPI;

import com.nokia.carbide.cpp.internal.api.sdk.SymbianBuildContextDataCache;

import com.nokia.carbide.cpp.internal.api.sdk.SymbianMacroStore;

import com.nokia.carbide.cpp.internal.api.sdk.sbsv2.SBSv2QueryUtils;

import com.nokia.carbide.cpp.sdk.core.ICarbideInstalledSDKChangeListener;

import com.nokia.carbide.cpp.sdk.core.ICarbideInstalledSDKChangeListener.SDKChangeEventType;

import com.nokia.carbide.cpp.sdk.core.IRVCTToolChainInfo;

import com.nokia.carbide.cpp.sdk.core.ISDKManager;

import com.nokia.carbide.cpp.sdk.core.ISymbianSDK;

import com.nokia.carbide.cpp.sdk.core.ISymbianSDKFeatures;

import com.nokia.carbide.cpp.sdk.core.SDKCorePlugin;

import com.nokia.carbide.cpp.sdk.core.SymbianSDKFactory;

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

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

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

import com.nokia.cpp.internal.api.utils.ui.WorkbenchUtils;

public abstract class AbstractSDKManager implements ISDKManager, ISDKManagerInternal {

	protected static List<ISymbianSDK> sdkList = new ArrayList<ISymbianSDK>();

	protected HashMap<String,ISymbianSDK> missingSdkMap = new HashMap<String,ISymbianSDK>();

	protected Job scanJob;

	public static final String SDK_MANAGER_CACHE_KEY = "sdk_manager_cache";

	protected static final String EMPTY_STRING = "";

	protected static boolean enableBSFScanner;

	protected static List<BuildPlat> platList = new ArrayList<BuildPlat>();

	protected static SymbianMacroStore macroStore;

	protected static final String[] knownRVCTVersions = {"3.1", "3.0", "2.2", "2.1"};

	protected Version sbsV2Version;

	static boolean sdkHookExtenstionsNotified;

	public static final String SDK_MANAGER_LOADED_HOOK = SDKCorePlugin.PLUGIN_ID

	+ ".sdkManagerLoadedHook"; //$NON-NLS-1$

	/**

	 * Minimum SBSv2 version supported with Carbide

	 */

	public static final Version MINIMUM_RAPTOR_VERSION = new Version(2, 15, 0);

	static boolean hasScannedSDKs = false; // make sure we only scan SDKs when needed

	protected static List<IRVCTToolChainInfo> rvctInfoList = null;

	/**

	 * Implement listener so other class that use this can listen to SDK 

	 * change event (e.g. validate project config description)

	 */

	protected static ListenerList<ICarbideInstalledSDKChangeListener> listeners = new ListenerList<ICarbideInstalledSDKChangeListener>();

	/*

	 * Implement listener so other class that use this can listen for when a change to the devices.xml

	 * has been modified outside of Carbide

	 */

	protected static ListenerList<ICarbideDevicesXMLChangeListener> devicesXMLListeners = new ListenerList<ICarbideDevicesXMLChangeListener>();

	IJobChangeListener scanJobListener = new IJobChangeListener() {

		public void sleeping(IJobChangeEvent event) {}

		public void scheduled(IJobChangeEvent event) {}

		public void running(IJobChangeEvent event) {}

		public void awake(IJobChangeEvent event) {}

		public void aboutToRun(IJobChangeEvent event) {}

		public void done(IJobChangeEvent event) {

			fireInstalledSdkChanged(SDKChangeEventType.eSDKScanned);

		}

	};

	public AbstractSDKManager() {

		macroStore = SymbianMacroStore.getInstance();

		scanJob = new Job ("Scan for installed SDKs") {

			@Override

			protected IStatus run(IProgressMonitor monitor) {

				return handleScan(monitor);

			}

		};

		addScanJobListner(scanJobListener);

	}

	public SymbianMacroStore getSymbianMacroStore(){

		return macroStore;

	}

	public void scanSDKs() {

		SBSv2QueryUtils.removeAllCachedQueries();

		// do the real sdk scanning in a job.

		if (scanJob.getState() == Job.NONE) {

			scanJob.schedule();

		}

	}

	private IStatus handleScan(IProgressMonitor monitor) {

		synchronized (sdkList)

		{

			ArrayList<ISymbianSDK> oldSDKList = new ArrayList<ISymbianSDK>(sdkList);

			getSBSv2Version(true);

			if (sdkList != null){

				sdkList.clear();

			}

			if (!doScanSDKs(monitor))

				return Status.OK_STATUS;;

			// now these SDK's are newly added, remove from internal list

			for (ISymbianSDK sdk : sdkList) {

				if (SDKManagerInternalAPI.getMissingSdk(sdk.getUniqueId()) != null) {

					SDKManagerInternalAPI.removeMissingSdk(sdk);

				}

			}

			// now these SDK's are removed from the old list, add to

			// internal list

			for (ISymbianSDK oldSdk : oldSDKList) {

				boolean found = false;

				for (ISymbianSDK sdk : sdkList) {

					if (sdk.getUniqueId().equals(oldSdk.getUniqueId())) {

						found = true;

						break;

					}

				}

				if (found == false) {

					SDKManagerInternalAPI.addMissingSdk(oldSdk);

					// flush cache

					SymbianBuildContextDataCache.refreshForSDKs(new ISymbianSDK[] { oldSdk });

				}

			}

		}

		// make sure we don't rescan over and over again

		hasScannedSDKs = true;

		updateCarbideSDKCache();

		// Notify any plugins that want to know if the SDKManager has scanned plugins.

		if (!sdkHookExtenstionsNotified) {

			notifySDKManagerLoaded();

			sdkHookExtenstionsNotified = true;

		}

		if (monitor.isCanceled()) {

			return Status.CANCEL_STATUS;

		}

		return Status.OK_STATUS;

	}

	/**

	 * Actually scan the SDKs available and populate sdkList.   

	 * @param oldSDkList old list of SDKs available for reference, e.g., detecting

	 * when SDKs are newly missing

	 * @return true if scan succeeded

	 */

	abstract protected boolean doScanSDKs(IProgressMonitor monitor);

	public void addScanJobListner(IJobChangeListener listener) {

		if (scanJob != null && listener != null) {

			scanJob.addJobChangeListener(listener);

		}

	}

	public void removeScanJobLisner(IJobChangeListener listener) {

		if (scanJob != null && listener != null) {

			scanJob.removeJobChangeListener(listener);

		}

	}

	protected void ensureScannedSDKs() {

		if (!hasScannedSDKs) {

			handleScan(new NullProgressMonitor());

			fireInstalledSdkChanged(SDKChangeEventType.eSDKScanned);

		}

	}

	public List<ISymbianSDK> getSDKList() {

		synchronized(sdkList)

		{

			if (sdkList.size() < 1) {

				ensureScannedSDKs();

			}

			List<ISymbianSDK> listCopy = new ArrayList<ISymbianSDK>(sdkList);

			return listCopy;			

		}

	}

	public ISymbianSDK getSDK(String sdkId, boolean scanIfNecessary) {

		if (scanIfNecessary) {

			getSDKList();

		}

		synchronized(sdkList)

		{

			for (Iterator iter = sdkList.iterator(); iter.hasNext();) {

				ISymbianSDK sdk = (ISymbianSDK)iter.next();

				if (sdk.getUniqueId().compareTo(sdkId) == 0) {

					return sdk;

				}

			}

		}

		return null;

	}

	public void addSDK(ISymbianSDK sdk) {

		synchronized(sdkList)

		{

			try {

				sdkList.add(sdk);

				updateSDK(sdk);

				SDKManagerInternalAPI.removeMissingSdk(sdk);

				// tell others about it

				fireInstalledSdkChanged(SDKChangeEventType.eSDKAdded);

			}

			catch (Exception e) {

				logError("Could not add SDK", e);

				String message = "Could not add this SDK. Your devices.xml file may be corrupt. If you remove the file from its current location and then rescan SDKs, Carbide will offer to create a new one.";

				Logging.showErrorDialog(WorkbenchUtils.getSafeShell(), null, message, Logging.newSimpleStatus(1, e));

			}

		}

	}

	public boolean removeSDK(String sdkId) {

		synchronized (sdkList)

		{

			if (sdkList != null){

				for (ISymbianSDK currSDK : sdkList){

					if (currSDK.getUniqueId().equals(sdkId)){

						sdkList.remove(currSDK);

						SDKManagerInternalAPI.addMissingSdk(currSDK);

						// tell others about it

						fireInstalledSdkChanged(SDKChangeEventType.eSDKRemoved);

						// only remove sdk from devices.xml if the sdk is defined in it

						if (((SymbianSDK)currSDK).getSupportedFeatures().contains(ISymbianSDKFeatures.IS_FROM_DEVICES_XML)) {

							doRemoveSDK(sdkId);

						}

						break;

					}

				}

				updateCarbideSDKCache();

			} else {

				return false;

			}			

		}

		return true;

	}

	abstract protected boolean doRemoveSDK(String sdkId);

	protected void scanCarbideSDKCache(){

		List<String> idList = getSDKCacheIdList();

		for (Iterator<String> itr = idList.iterator(); itr.hasNext();) {

			String id = itr.next();

			SDKManagerCacheEntry entry = getSDKCacheEntry(id);

			ISymbianSDK sdk = getSDK(id, false);

			if (sdk == null) {

				Version osVersion = new Version(entry.getOsVersion());

				if (osVersion.getMajor() == 0) {

					osVersion = new Version("9.5");

				}

				sdk = SymbianSDKFactory.createInstance(id, 

						   entry.getEpocRoot(),

						   osVersion);

				((SymbianSDK)sdk).setEnabled(entry.isEnabled());

				synchronized (sdkList) {

					sdkList.add(sdk);

				}

			} else {

				((SymbianSDK)sdk).setEnabled(entry.isEnabled());

			}

		}

	}

	public void updateCarbideSDKCache() {

		if (!Platform.isRunning())

			return;

		clearSDKCache();

		synchronized(sdkList)

		{

			for (ISymbianSDK currSDK: sdkList) {

				SDKManagerCacheEntry entry = new SDKManagerCacheEntry();

				entry.setId(currSDK.getUniqueId());

				entry.setEpocRoot(currSDK.getEPOCROOT());

				entry.setOsVersion(currSDK.getOSVersion().toString());

				entry.setEnabled(currSDK.isEnabled());

				setSDKCacheEntry(entry);

			}

		}

	}

	/**

	 * Tell whether EPOCROOT can be changed for a given ISymbianSDK

	 * @return flag

	 */

	abstract protected boolean isEPOCRootFixed();

	/**

	 * Get whether or not the UI has enabled BSF scanning.

	 * @return true if BSF scanning is enabled.

	 */

	public boolean getBSFScannerEnabled(){

		return enableBSFScanner;

	}

	/**

	 * Set whether or not build platforms should be added for SDKs that contain .bsf extensions.

	 * @param enabled - When true, add BSF platforms.

	 */

	public void enableBSFScanner(boolean enabled){

		enableBSFScanner = enabled;

	}

	public void setPlatformList(List<BuildPlat> inPlatList){

		platList = inPlatList;

	}

	public List<BuildPlat> getPlatformList(){

		return platList;

	}

	/**

	 * Returns toolchain info for all detected RVCT tools.

	 * @return Array of toolchain information objects.

	 */

	public synchronized IRVCTToolChainInfo[] getInstalledRVCTTools() {

		// the path wn't change inside one invocation so cache the results

		if (rvctInfoList == null) {

			rvctInfoList = scanForInstalledRVCTCompilers();

		}

		return (IRVCTToolChainInfo[]) rvctInfoList.toArray(new IRVCTToolChainInfo[rvctInfoList.size()]);

	}

	/**

	 * Get a list of IRVCTToolChainInfo objects for all RVCT installations detected on the PATH env var.

	 */

	protected static List<IRVCTToolChainInfo> scanForInstalledRVCTCompilers() {

		Runtime rt=Runtime.getRuntime();

		List<IRVCTToolChainInfo> rvctToolList = new ArrayList<IRVCTToolChainInfo>();

		IPath[] pathEntries = PathUtils.getPathEntries(null);

		for(IPath path : pathEntries) {

			try {

				String command = path.append("armcc").toOSString() + " --vsn";

				Process p = rt.exec(command);

				BufferedReader br = new BufferedReader(new InputStreamReader(p.getErrorStream()));

				String overallOutput = null;

				String stdErrLine = null;

				// RVCT waits for like 4 minutes trying to find a license when the computer is

				// not connected to the network.  in such cases, the call to br.readline doesn't

				// return for 4 minutes which is unacceptable here.  Instead we'll poll at 1/2 second

				// intervals for 5 seconds and see if we get a response. On the first response we break out

				// of the loop and read the output. So in most normal circumstances it will take 1/2 to 1 seconds.

				int maxTries = 10;

				int numTries = 0;

				while (numTries < maxTries) {

					try {

						Thread.sleep(500);

					} catch (InterruptedException e) {

						// ignore

					}

					if (br.ready()) {

						while ((stdErrLine = br.readLine()) != null) {

							overallOutput += stdErrLine;

						}

						break;

					}

					numTries++;

				}

				p.destroy();

				if (overallOutput != null && overallOutput.length() > 0){

					for (String currVersion : knownRVCTVersions) {

						if(overallOutput.contains(currVersion)) {

							RVCTToolChainInfo rvctInfo = new RVCTToolChainInfo();

							rvctInfo.setRvctToolBinariesDirectory(path.toOSString());

							rvctInfo.setRvctToolsVersion(new Version(currVersion));

							rvctToolList.add(rvctInfo);

							break; // tool successfully added

						}

					}

				}

			}

			catch (IOException e) {

				// armcc isn't in this directory, ignore....

			}

		}

		return rvctToolList;

	}

    public void addMissingSdk(ISymbianSDK sdk) {

		missingSdkMap.put(sdk.getUniqueId(), sdk);

    }

    public ISymbianSDK addMissingSdk(String uid) {

		ISymbianSDK sdk = getMissingSdk(uid);

		if (sdk == null) {

			sdk = SymbianMissingSDKFactory.createInstance(uid);

			missingSdkMap.put(uid, sdk);

		}

    	return sdk;

    }

    public void removeMissingSdk(ISymbianSDK sdk) {

    	missingSdkMap.remove(sdk.getUniqueId());

    }

    public void removeMissingSdk(String uid) {

    	missingSdkMap.remove(uid);

    }

    public ISymbianSDK getMissingSdk(String uid) {

    	return missingSdkMap.get(uid);

    }

	public List<ISymbianSDK> getMissingSDKList() {

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

		synchronized(missingSdkMap) {

			for (ISymbianSDK sdk : missingSdkMap.values()) {

				listCopy.add(sdk);

			}

		}

		return listCopy;			

	}

	public void addInstalledSdkChangeListener(ICarbideInstalledSDKChangeListener listener) {

		listeners.add(listener);

	}

	public void removeInstalledSdkChangeListener(ICarbideInstalledSDKChangeListener listener) {

		listeners.remove(listener);

	}

	public void fireInstalledSdkChanged(SDKChangeEventType eventType) {

		for (ICarbideInstalledSDKChangeListener l : listeners) {

			l.installedSdkChanged(eventType);

		}

	}

	public void addDevicesXMLChangeListener(ICarbideDevicesXMLChangeListener listener) {

		devicesXMLListeners.add(listener);

	}