/*******************************************************************************
 * Copyright (c) 2005, 2007 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 
 *******************************************************************************/
package org.eclipse.dltk.core;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.SubProgressMonitor;
import org.eclipse.dltk.ast.declarations.ISourceParser;
import org.eclipse.dltk.codeassist.ICompletionEngine;
import org.eclipse.dltk.codeassist.ISelectionEngine;
import org.eclipse.dltk.compiler.problem.DefaultProblemFactory;
import org.eclipse.dltk.compiler.problem.IProblemFactory;
import org.eclipse.dltk.core.search.DLTKSearchParticipant;
import org.eclipse.dltk.core.search.IDLTKSearchScope;
import org.eclipse.dltk.core.search.IMatchLocatorParser;
import org.eclipse.dltk.core.search.SearchPattern;
import org.eclipse.dltk.core.search.SearchRequestor;
import org.eclipse.dltk.core.search.indexing.SourceIndexerRequestor;
import org.eclipse.dltk.core.search.matching.MatchLocator;
import org.eclipse.dltk.internal.core.ClassBasedDLTKExtensionManager;
import org.eclipse.dltk.internal.core.NewInstanceClassBasedDLTKExtensionManager;
import org.eclipse.dltk.internal.core.BasicDLTKExtensionManager.ElementInfo;

public class DLTKLanguageManager {
	private final static String LANGUAGE_EXTPOINT = DLTKCore.PLUGIN_ID
			+ ".language";
	private final static String SOURCE_ELEMENT_PARSERS_EXTPOINT = DLTKCore.PLUGIN_ID
			+ ".sourceElementParsers";
	private final static String SOURCE_PARSERS_EXTPOINT = DLTKCore.PLUGIN_ID
			+ ".sourceParsers";
	private final static String PROBLEM_FACTORY_EXTPOINT = DLTKCore.PLUGIN_ID
			+ ".problemFactory";
	private final static String COMPLETION_ENGINE_EXTPOINT = DLTKCore.PLUGIN_ID
			+ ".completionEngine";
	private final static String SELECTION_ENGINE_EXTPOINT = DLTKCore.PLUGIN_ID
			+ ".selectionEngine";
	private final static String SEARCH_EXTPOINT = DLTKCore.PLUGIN_ID
			+ ".search";
	private final static String CALLHIERARCHY_EXTPOINT = DLTKCore.PLUGIN_ID
			+ ".callHierarchy";

	private static ClassBasedDLTKExtensionManager instance = new ClassBasedDLTKExtensionManager(
			LANGUAGE_EXTPOINT);

	// Inner managers
	private static ClassBasedDLTKExtensionManager sourceElementParsersManager = new NewInstanceClassBasedDLTKExtensionManager(
			SOURCE_ELEMENT_PARSERS_EXTPOINT);
	private static ClassBasedDLTKExtensionManager problemFactoryManager = new ClassBasedDLTKExtensionManager(
			PROBLEM_FACTORY_EXTPOINT);

	private static ClassBasedDLTKExtensionManager selectionEngineManager = new NewInstanceClassBasedDLTKExtensionManager(
			SELECTION_ENGINE_EXTPOINT);
	private static ClassBasedDLTKExtensionManager completionEngineManager = new NewInstanceClassBasedDLTKExtensionManager(
			COMPLETION_ENGINE_EXTPOINT);
	private static ClassBasedDLTKExtensionManager sourceParsersManager = new NewInstanceClassBasedDLTKExtensionManager(
			SOURCE_PARSERS_EXTPOINT);

	private static ClassBasedDLTKExtensionManager searchManager = new ClassBasedDLTKExtensionManager(
			SEARCH_EXTPOINT);
	private static ClassBasedDLTKExtensionManager callHierarchyManager = new ClassBasedDLTKExtensionManager(
			CALLHIERARCHY_EXTPOINT);

	public static IDLTKLanguageToolkit getLanguageToolkit(String natureId)
			throws CoreException {

		return (IDLTKLanguageToolkit) instance.getObject(natureId);
	}

	private static IDLTKLanguageToolkit findAppropriateToolkitByObject(
			Object object) {
		ElementInfo[] elementInfos = instance.getElementInfos();
		for (int j = 0; j < elementInfos.length; j++) {
			IDLTKLanguageToolkit toolkit = (IDLTKLanguageToolkit) instance
					.getInitObject(elementInfos[j]);
			if (object instanceof IResource) {
				if (toolkit.validateSourceModule((IResource) object)
						.getSeverity() == Status.OK) {
					return toolkit;
				}
			} else if (object instanceof IPath) {
				if (toolkit.validateSourceModule((IPath) object).getSeverity() == Status.OK) {
					return toolkit;
				}
			} else {
				return null;
			}
		}
		return null;
	}

	public static boolean hasScriptNature(IProject project) {
		return instance.findScriptNature(project) != null;
	}

	public static IDLTKLanguageToolkit getLanguageToolkit(IModelElement element)
			throws CoreException {
		IDLTKLanguageToolkit toolkit = (IDLTKLanguageToolkit) instance.getObject(element);
		if( toolkit == null && element.getElementType() == IModelElement.SOURCE_MODULE ) {
			return findAppropriateToolkitByObject(element.getPath());
		}
		return toolkit;
	}

	public static IDLTKLanguageToolkit findToolkit(IResource resource) {
		return findAppropriateToolkitByObject(resource);
	}

	public static IDLTKLanguageToolkit findToolkit(IPath path) {
		return findAppropriateToolkitByObject(path);
	}

	public static ISourceElementParser getSourceElementParser(String nature)
			throws CoreException {
		return (ISourceElementParser) sourceElementParsersManager
				.getObject(nature);
	}

	public static ISourceElementParser getSourceElementParser(
			IModelElement element) throws CoreException {
		return (ISourceElementParser) sourceElementParsersManager
				.getObject(element);
	}

// public static ISourceParser getSourceParser( String nature ) throws
// CoreException {
// return (ISourceElementParser) sourceParsersManager.getObject(nature);
// }
//	
// public static ISourceParser getSourceParser( IModelElement element ) throws
// CoreException {
// return (ISourceElementParser) sourceParsersManager.getObject(element);
// }

	public static IProblemFactory getProblemFactory(String natureID)
			throws CoreException {
		IProblemFactory factory = (IProblemFactory) problemFactoryManager
				.getObject(natureID);
		if (factory != null) {
			return factory;
		}
		return new DefaultProblemFactory();
	}

	public static IProblemFactory getProblemFactory(IModelElement element)
			throws CoreException {
		IProblemFactory factory = (IProblemFactory) problemFactoryManager
				.getObject(element);
		if (factory != null) {
			return factory;
		}
		return new DefaultProblemFactory();
	}

	public static ICompletionEngine getCompletionEngine(String natureID)
			throws CoreException {
		return (ICompletionEngine) completionEngineManager.getObject(natureID);
	}

	public static ISelectionEngine getSelectionEngine(String natureID)
			throws CoreException {
		return (ISelectionEngine) selectionEngineManager.getObject(natureID);
	}

	public static ISourceParser getSourceParser(String natureID)
			throws CoreException {
		return (ISourceParser) sourceParsersManager.getObject(natureID);
	}

	/**
	 * Return source parser witch is one level lower from top. If this is only
	 * one source parser for selected ature then return null.
	 * 
	 */
	public static ISourceParser getSourceParserLower(String natureID)
			throws CoreException {
		return (ISourceParser) sourceParsersManager.getObjectLower(natureID);
	}

	public static DLTKSearchParticipant createSearchParticipant(String natureID) {
		ISearchFactory factory = getSearchFactory(natureID);
		if (factory != null) {
			DLTKSearchParticipant participant = factory
					.createSearchParticipant();
			if (participant != null) {
				return participant;
			}
		}
		return new DLTKSearchParticipant();
	}

	private static ISearchFactory getSearchFactory(String natureId) {
		return (ISearchFactory) searchManager.getObject(natureId);
	}

	public static MatchLocator createMatchLocator(String natureID,
			SearchPattern pattern, SearchRequestor requestor,
			IDLTKSearchScope scope, SubProgressMonitor subProgressMonitor) {
		ISearchFactory factory = getSearchFactory(natureID);
		if (factory != null) {
			MatchLocator locator = factory.createMatchLocator(pattern,
					requestor, scope, subProgressMonitor);
			if (locator != null) {
				return locator;
			}
		}
		return new MatchLocator(pattern, requestor, scope, subProgressMonitor);
	}

	public static SourceIndexerRequestor createSourceRequestor(String natureID) {
		ISearchFactory factory = getSearchFactory(natureID);
		if (factory != null) {
			SourceIndexerRequestor requestor = factory.createSourceRequestor();
			if (requestor != null) {
				return requestor;
			}
		}
		return new SourceIndexerRequestor();
	}

	public static IMatchLocatorParser createMatchParser(String natureID,
			MatchLocator matchLocator) {
		ISearchFactory factory = getSearchFactory(natureID);
		if (factory != null) {
			return factory.createMatchParser(matchLocator);
		}
		return null;
	}

	public static ICalleeProcessor createCalleeProcessor(String natureID,
			IMethod member, IProgressMonitor progressMonitor,
			IDLTKSearchScope scope) {
		ICallHierarchyFactory factory = getCallHierarchyFactory(natureID);
		if (factory != null) {
			ICalleeProcessor processor = factory.createCalleeProcessor(member,
					progressMonitor, scope);
			return processor;
		}
		return null;
	}

	private static ICallHierarchyFactory getCallHierarchyFactory(String natureId) {
		return (ICallHierarchyFactory) callHierarchyManager.getObject(natureId);
	}

	public static ICallProcessor createCallProcessor(String natureID) {
		ICallHierarchyFactory factory = getCallHierarchyFactory(natureID);
		if (factory != null) {
			return factory.createCallProcessor();
		}
		return null;
	}
}
