/*

* 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.util.*;

import org.eclipse.core.runtime.IPath;

import org.osgi.framework.Version;

import com.nokia.carbide.cpp.epoc.engine.model.sbv.ISBVView;

import com.nokia.carbide.cpp.epoc.engine.preprocessor.*;

import com.nokia.carbide.cpp.internal.sdk.core.model.SymbianMissingSDKFactory;

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

import com.nokia.carbide.internal.api.cpp.epoc.engine.preprocessor.BasicIncludeFileLocator;

import com.nokia.carbide.internal.api.cpp.epoc.engine.preprocessor.MacroScanner;

public class SymbianBuildContext implements ISymbianBuildContext {

	private String sdkId;

	private String platform;

	private String target;

	private String displayString = null;

	private static String EMULATOR_DISPLAY_TEXT = "Emulator"; //$NON-NLS-1$

	private static String PHONE_DISPLAY_TEXT = "Phone"; //$NON-NLS-1$

	private static String DEBUG_DISPLAY_TEXT = "Debug"; //$NON-NLS-1$

	private static String RELEASE_DISPLAY_TEXT = "Release"; //$NON-NLS-1$

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

	private static String SDK_NOT_INSTALLED = "SDK not installed"; //$NON-NLS-1$

	// a copy of bad SDK default to fall back

	private static ISymbianSDK fallbackForBadSdk = SymbianMissingSDKFactory.createInstance("dummy_ID"); //$NON-NLS-1$

	// last time we checked the hrh file mod dates - only check if changed in last second

	private static final long HRH_TIMESTAMP_CHECK_QUANTUM = 1000; // 1 sec

	private static long lastHrhTimestampCheck;

	private File prefixFileParsed;

	private List<File> hrhFilesParsed = new ArrayList<File>();

	private List<IDefine> variantHRHMacros = new ArrayList<IDefine>();

	private long hrhCacheTimestamp;

	private List<IDefine> compilerPrefixMacros = new ArrayList<IDefine>();

	private long compilerCacheTimestamp;

	public SymbianBuildContext(ISymbianSDK theSDK, String thePlatform, String theTarget) {

		sdkId = theSDK.getUniqueId();

		platform = thePlatform;

		target = theTarget;

		getDisplayString();

	}

	@Override

	public int hashCode() {

		final int prime = 31;

		int result = 1;

		result = prime * result

				+ ((platform == null) ? 0 : platform.hashCode());

		result = prime * result + ((getSDK() == null) ? 0 : getSDK().getEPOCROOT().hashCode());

		result = prime * result + ((target == null) ? 0 : target.hashCode());

		return result;

	}

	@Override

	public boolean equals(Object obj) {

		if (this == obj)

			return true;

		if (obj == null)

			return false;

		if (getClass() != obj.getClass())

			return false;

		final SymbianBuildContext other = (SymbianBuildContext) obj;

		if (platform == null) {

			if (other.platform != null)

				return false;

		} else if (!platform.equals(other.platform))

			return false;

		if (getSDK() == null) {

			if (other.getSDK() != null)

				return false;

		} else if (!getSDK().getEPOCROOT().equals(other.getSDK().getEPOCROOT()))

			return false;

		if (target == null) {

			if (other.target != null)

				return false;

		} else if (!target.equals(other.target))

			return false;

		return true;

	}

	public ISymbianSDK getSDK() {

		ISymbianSDK sdk = SDKCorePlugin.getSDKManager().getSDK(sdkId, true);

		if (sdk == null){

			sdk = fallbackForBadSdk;

		}

		return sdk;

	}

	public String getPlatformString() {

		return platform;

	}

	public String getTargetString() {

		return target;

	}

	public String getDisplayString() {

		if (displayString == null) {

			// in the form Emulation Debug (WINSCW) [S60_3rd_MR] or

			// Phone Release (GCCE) [S60_3rd_MR]

			if (platform.compareTo(ISymbianBuildContext.EMULATOR_PLATFORM) == 0) {

				displayString = EMULATOR_DISPLAY_TEXT;

			} else {

				displayString = PHONE_DISPLAY_TEXT;

			}

			if (target.compareTo(ISymbianBuildContext.DEBUG_TARGET) == 0) {

				displayString = displayString + SPACE_DISPLAY_TEXT + DEBUG_DISPLAY_TEXT;

			} else {

				displayString = displayString + SPACE_DISPLAY_TEXT + RELEASE_DISPLAY_TEXT;

			}

			displayString = displayString + " (" + platform + ") [" + getSDK().getUniqueId() + "]"; //$NON-NLS-1$

		}

		return displayString;

	}

	public static ISymbianBuildContext getBuildContextFromDisplayName(String displayName) {

		if (isValidConfigName(displayName)) {

			String sdkId = getSDKIDFromConfigName(displayName);

			ISymbianSDK sdk = SDKCorePlugin.getSDKManager().getSDK(sdkId, true);

			if (sdk == null) {

				// add a dummy should a build context ask for a removed SDK

				sdk = SDKManagerInternalAPI.addMissingSdk(sdkId);

			}

			return new SymbianBuildContext(sdk, getPlatformFromBuildConfigName(displayName), getTargetFromBuildConfigName(displayName));

		}

		return new SymbianBuildContext(fallbackForBadSdk, SDK_NOT_INSTALLED, SDK_NOT_INSTALLED);

	}

	private static String getPlatformFromBuildConfigName(String configName) {

		String[] tokens = configName.split(SPACE_DISPLAY_TEXT);

		String sdkIdToken = tokens[2];

		return sdkIdToken.substring(1, sdkIdToken.length()-1);

	}

	public static String getSDKIDFromConfigName(String configName) {

		int indexBegin = configName.indexOf("[");  //$NON-NLS-1$

		int indexEnd = configName.indexOf("]");  //$NON-NLS-1$

		if (indexBegin > 0 && indexEnd > 0){

			return configName.substring(indexBegin+1, indexEnd);

		} else {

			return ""; //$NON-NLS-1$

		}

	}

	private static String getTargetFromBuildConfigName(String configName) {

		String[] tokens = configName.split(SPACE_DISPLAY_TEXT);

		if (tokens[1].compareTo(DEBUG_DISPLAY_TEXT) == 0) {

			return ISymbianBuildContext.DEBUG_TARGET;

		} else {

			return ISymbianBuildContext.RELEASE_TARGET;

		}

	}

	private static boolean isValidConfigName(String configName) {

		// <Phone | Emulator> <Target> (<Platform>) [<SDK ID>]

		if (configName != null && !configName.equals("")) { //$NON-NLS-1$

			String[] tokens = configName.split(SPACE_DISPLAY_TEXT);

			if (tokens.length >= 4) {

				if (tokens[0].compareTo(EMULATOR_DISPLAY_TEXT) == 0 || tokens[0].compareTo(PHONE_DISPLAY_TEXT) == 0) {

					if (tokens[1].compareTo(DEBUG_DISPLAY_TEXT) == 0 || tokens[1].compareTo(RELEASE_DISPLAY_TEXT) == 0) {

						if (tokens[2].matches("(.*)")) { //$NON-NLS-1$

							if (tokens[3].matches("\\[.*")) { //$NON-NLS-1$

								return true;

							}

						}

					}

				}

			}

		}

		return false;

	}

	public String toString() {

		return getDisplayString();

	}

	public String getDefaultDefFileDirectoryName(boolean isASSP) {

		// TODO: How the ASSP option affects the path?

		String dirName = getDefFileDirectoryNameForPlatform(platform);

		if (dirName == null) {

			// check BSF's

			IBSFCatalog catalog = getSDK().getBSFCatalog();

	    	if (catalog != null) {

	    		for (IBSFPlatform plat : catalog.getPlatforms()) {

	    			if (plat.getName().compareToIgnoreCase(platform) == 0) {

	    				String mainPlatform = catalog.getReleasePlatform(platform);

	    				if (mainPlatform != null) {

	    					dirName = getDefFileDirectoryNameForPlatform(mainPlatform);

	    					if (dirName == null || dirName.length() < 1) {

	    						// fallback - all BSF's should be EABI anyway

			    				return "EABI"; //$NON-NLS-1$

	    					}

	    				}

	    			}

	    		}

	    	}

		}

		if (dirName == null) {

			// fallback for unknown cases

			dirName = platform;

		}

		return dirName;

	}

	private String getDefFileDirectoryNameForPlatform(String platform) {

		if (platform.equals(THUMB_PLATFORM)

				|| platform.equals(ARM4_PLATFORM)

				|| platform.equals(ARMI_PLATFORM)) {

			return "BMARM"; //$NON-NLS-1$

		} else if (platform.equals(EMULATOR_PLATFORM)) {

			return "BWINS"; //$NON-NLS-1$

		} else if (platform.equals(ARMV5_PLATFORM)

					|| platform.equals(ARMV5_ABIV2_PLATFORM)

					|| platform.equals(ARMV6_PLATFORM)

					|| platform.equals(ARMV6_ABIV2_PLATFORM)

					|| platform.equals(GCCE_PLATFORM)) {

			return "EABI"; //$NON-NLS-1$

		}

		return null;

	}

	public IPath getCompilerPrefixFile() {

		if (platform.equals(GCCE_PLATFORM)) {

			return getGCCEPrefixFilePath();

		} else if (platform.equals(ARMV5_PLATFORM)

					|| platform.equals(ARMV5_ABIV2_PLATFORM)

					|| platform.equals(ARMV6_PLATFORM)

					|| platform.equals(ARMV6_ABIV2_PLATFORM)) {

			return getRVCTPrefixFilePath();

		} else if (platform.equals(EMULATOR_PLATFORM)

				|| platform.equals(ARMI_PLATFORM)

				|| platform.equals(ARM4_PLATFORM)

				|| platform.equals(THUMB_PLATFORM)) {

			return null;

		} else {

			// check BSF's

			IBSFCatalog catalog = getSDK().getBSFCatalog();

	    	if (catalog != null) {

	    		for (IBSFPlatform plat : catalog.getPlatforms()) {

	    			if (plat.getName().compareToIgnoreCase(platform) == 0) {

	    				String mainPlatform = catalog.getReleasePlatform(platform);

	    				if (mainPlatform != null) {

	    					if (mainPlatform.equals(GCCE_PLATFORM)) {

	    						return getGCCEPrefixFilePath();

	    					} else if (mainPlatform.equals(ARMV5_PLATFORM) 

	    								|| mainPlatform.equals(ARMV5_ABIV2_PLATFORM)

	    								|| mainPlatform.equals(ARMV6_PLATFORM)

	    								|| mainPlatform.equals(ARMV6_ABIV2_PLATFORM)) {

	    						return getRVCTPrefixFilePath();

	    					} else {

	    						// fallback - all BSF's should be EABI anyway

	    						return getRVCTPrefixFilePath();

	    					}

	    				}

	    			}

	    		}

	    	}

		}

		// fallback for WINSCW, MSVC, etc.

		return null;

	}

	private IPath getGCCEPrefixFilePath() {

		return getSDK().getIncludePath().append("gcce/gcce.h"); //$NON-NLS-1$

	}

	private IPath getRVCTPrefixFilePath() {

		IRVCTToolChainInfo[] installedRVCTTools = SDKCorePlugin.getSDKManager().getInstalledRVCTTools();

		// use default in case tools aren't installed

		String rvctFragment = "rvct2_2"; //$NON-NLS-1$

		if (installedRVCTTools.length > 0) {

			rvctFragment = getRVCTFragment(installedRVCTTools[0]);

		}

		return getSDK().getIncludePath().append(rvctFragment).append(rvctFragment + ".h"); //$NON-NLS-1$

	}

	private String getRVCTFragment(IRVCTToolChainInfo info) {

		int major = 0, minor = 0;

		if (info != null) {

			Version rvctToolsVersion = info.getRvctToolsVersion();

			if (rvctToolsVersion != null) {

				major = info.getRvctToolsVersion().getMajor();

				minor = info.getRvctToolsVersion().getMinor();

			}

		}

		return "rvct" + major + "_" + minor; //$NON-NLS-1$ //$NON-NLS-2$

	}

	public List<IDefine> getVariantHRHDefines() {

		// we parse the variant hrh file to gather macros.  this can be time consuming so do it

		// once and cache the values.  only reset the cache when the hrh or any of its includes

		// has changed.

		boolean buildCache = false;

		if (hrhCacheTimestamp == 0) {

			// hasn't been built yet

			buildCache = true;

		} else {

			// cache exists.  see if any of the files have changed

			ISymbianSDK sdk = getSDK();

			if (sdk != null) {

				// the prefix may have been added, removed, or changed.  in any case,

				// we would need to reset the cache

				File currentPrefixFile = sdk.getPrefixFile();

				if (currentPrefixFile == null) {

					if (prefixFileParsed != null) {

						// prefix file was removed from the SDK

						buildCache = true;

					}

				} else {

					if (prefixFileParsed == null) {

						// prefix file was added to the SDK

						buildCache = true;

					} else {

						// there was a prefix file before and now.  see if it's the same file

						// and if so, has it been modified?

						if (!currentPrefixFile.equals(prefixFileParsed) || currentPrefixFile.lastModified() > hrhCacheTimestamp) {

							buildCache = true;

						}

					}

				}

			}

			// now check to see if any of the included hrh files have changed

			// we will do this at most once per quantum, because it is expensive and during import it was done 100 times per second

			if (!buildCache && (System.currentTimeMillis() - lastHrhTimestampCheck) > HRH_TIMESTAMP_CHECK_QUANTUM) {

				for (File file : hrhFilesParsed) {

					if (file.lastModified() > hrhCacheTimestamp) {

						buildCache = true;

						break;

					}

				}

				lastHrhTimestampCheck = System.currentTimeMillis();

			}

		}

		if (buildCache) {

			variantHRHMacros.clear();

			synchronized (this) {

				List<IDefine> macros = new ArrayList<IDefine>();

				Map<String, IDefine> namedMacros = new HashMap<String, IDefine>();

				File prefixFile = getSDK().getPrefixFile();

				if (prefixFile != null) {

					// add any BSF/SBV includes so the headers are picked up from the correct location

					List<File> systemPaths = new ArrayList<File>();

					IBSFPlatform bsfPlat = getSDK().getBSFCatalog().findPlatform(platform);

					ISBVPlatform sbvPlat = getSDK().getSBVCatalog().findPlatform(platform);

					if (bsfPlat != null) {

						for (IPath path : bsfPlat.getSystemIncludePaths()) {

							systemPaths.add(path.toFile());

						}

					} else if (sbvPlat != null) {

						LinkedHashMap<IPath, String> platPaths = sbvPlat.getBuildIncludePaths();

						Set<IPath> set = platPaths.keySet();

						for (IPath path : set) {

							String pathType = platPaths.get(path);

							if (pathType.equalsIgnoreCase(ISBVView.INCLUDE_FLAG_PREPEND) || pathType.equalsIgnoreCase(ISBVView.INCLUDE_FLAG_SET)){

								systemPaths.add(path.toFile());

							}

						}

					}

					MacroScanner scanner = new MacroScanner(

							new BasicIncludeFileLocator(null, systemPaths.toArray(new File[systemPaths.size()])),

							DefaultModelDocumentProvider.getInstance(),

							DefaultTranslationUnitProvider.getInstance());

					scanner.scanFile(prefixFile);

					List<IDefine> scannedMacros = (List<IDefine>)scanner.getMacroDefinitions();

					for (IDefine scannedMacro : scannedMacros){

						// we don't want duplicate macros, so check to see if it's already there.

						// if it is, remove it and then add the newer one.  this is consistent with

						// how it would be from a compiler standpoint.

						IDefine macro = namedMacros.get(scannedMacro.getName());

						if (macro != null) {

							macros.remove(macro);

						}

						macros.add(scannedMacro);

						namedMacros.put(scannedMacro.getName(), scannedMacro);

					}

					hrhFilesParsed.clear();

					for (File inc : scanner.getIncludedFiles()) {

						hrhFilesParsed.add(inc);

					}

					List<String> variantCFGMacros = new ArrayList<String>();

					variantCFGMacros = getSDK().getVariantCFGMacros();

					for (String cfgMacros : variantCFGMacros){

						// we don't want duplicate macros, so check to see if it's already there.

						IDefine existingMacro = namedMacros.get(cfgMacros);

						if (existingMacro != null) {

							macros.remove(existingMacro);

						}

						IDefine macro = DefineFactory.createSimpleFreeformDefine(cfgMacros);

						macros.add(macro);

						namedMacros.put(macro.getName(), macro);

					}

					// store off the time when we created the cache

					hrhCacheTimestamp = System.currentTimeMillis();

				}

				// save the prefix file (which may be null)

				prefixFileParsed = prefixFile;

				variantHRHMacros = macros;

			}

		}

		return variantHRHMacros;

	}

	public List<File> getPrefixFileIncludes() {

		return hrhFilesParsed;

	}

	public List<IDefine> getCompilerMacros() {

		// we parse the compiler prefix file to gather macros.  this can be time consuming so do it

		// once and cache the values.  only reset the cache when the compiler prefix has changed.

		IPath prefixFile = getCompilerPrefixFile();

		if (prefixFile == null || !prefixFile.toFile().exists()) {

			compilerPrefixMacros.clear();

			return compilerPrefixMacros;

		}

		if ((compilerCacheTimestamp == 0) ||

				(prefixFile.toFile().lastModified() > compilerCacheTimestamp)) {

			compilerPrefixMacros.clear();

			synchronized (this) {

				List<IDefine> macros = new ArrayList<IDefine>();

				if (prefixFile != null) {

					List<File> userPaths = new ArrayList<File>();

					List<File> systemPaths = new ArrayList<File>();

					userPaths.add(prefixFile.removeLastSegments(1).toFile());

					systemPaths.add(prefixFile.removeLastSegments(1).toFile());

					IPath includePath = getSDK().getIncludePath();

					if (includePath != null) {

						File includeDir = includePath.toFile().getAbsoluteFile();

						userPaths.add(includeDir);

						systemPaths.add(includeDir);

					}

					// get macros from the compiler prefix file: note, this is a stupid

					// scan that will get the last version #defined, even if inside an #if.

					MacroScanner scanner = new MacroScanner(

							new BasicIncludeFileLocator(userPaths.toArray(new File[userPaths.size()]), systemPaths.toArray(new File[systemPaths.size()])),

							DefaultModelDocumentProvider.getInstance(), 

							DefaultTranslationUnitProvider.getInstance());

					scanner.scanFile(prefixFile.toFile());

					for (IDefine define : scanner.getMacroDefinitions()) {

						macros.add(define);

					}

					// store off the time when we created the cache

					compilerCacheTimestamp = System.currentTimeMillis();

				}

				compilerPrefixMacros = macros;

			}

		}