/*******************************************************************************
 * Copyright (c) 2007, 2011 QNX Software Systems 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
 *
 * Contributors:
 *    Bryan Wilkinson (QNX) - Initial API and implementation
 *    Markus Schorn (Wind River Systems)
 *******************************************************************************/
package org.eclipse.cdt.internal.core.pdom.dom.cpp;

import org.eclipse.cdt.core.CCorePlugin;
import org.eclipse.cdt.core.dom.ast.DOMException;
import org.eclipse.cdt.core.dom.ast.IBinding;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.ITypedef;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassTemplate;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassTemplatePartialSpecialization;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPSpecialization;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateArgument;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateParameter;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateParameterMap;
import org.eclipse.cdt.core.parser.util.ObjectMap;
import org.eclipse.cdt.internal.core.Util;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPClassTemplatePartialSpecialization;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPTemplates;
import org.eclipse.cdt.internal.core.index.IIndexCPPBindingConstants;
import org.eclipse.cdt.internal.core.index.IndexCPPSignatureUtil;
import org.eclipse.cdt.internal.core.pdom.db.Database;
import org.eclipse.cdt.internal.core.pdom.dom.IPDOMOverloader;
import org.eclipse.cdt.internal.core.pdom.dom.PDOMBinding;
import org.eclipse.cdt.internal.core.pdom.dom.PDOMLinkage;
import org.eclipse.cdt.internal.core.pdom.dom.PDOMNode;
import org.eclipse.core.runtime.CoreException;

/**
 * Partial specialization of a class template for the index.
 */
class PDOMCPPClassTemplatePartialSpecialization extends	PDOMCPPClassTemplate 
		implements IPDOMPartialSpecialization, ICPPSpecialization, IPDOMOverloader {
	
	private static final int ARGUMENTS = PDOMCPPClassTemplate.RECORD_SIZE + 0;
	private static final int SIGNATURE_HASH = PDOMCPPClassTemplate.RECORD_SIZE + 4;
	private static final int PRIMARY = PDOMCPPClassTemplate.RECORD_SIZE + 8;
	private static final int NEXT_PARTIAL = PDOMCPPClassTemplate.RECORD_SIZE + 12;
	
	/**
	 * The size in bytes of a PDOMCPPClassTemplatePartialSpecialization record in the database.
	 */
	@SuppressWarnings("hiding")
	protected static final int RECORD_SIZE = PDOMCPPClassTemplate.RECORD_SIZE + 16;
	
	public PDOMCPPClassTemplatePartialSpecialization(PDOMCPPLinkage linkage, PDOMNode parent,
			ICPPClassTemplatePartialSpecialization partial, PDOMCPPClassTemplate primary) 
			throws CoreException, DOMException {
		super(linkage, parent, partial);
		getDB().putRecPtr(record + PRIMARY, primary.getRecord());
		primary.addPartial(this);
		
		try {
			Integer sigHash = IndexCPPSignatureUtil.getSignatureHash(partial);
			getDB().putInt(record + SIGNATURE_HASH, sigHash != null ? sigHash.intValue() : 0);
		} catch (DOMException e) {
			throw new CoreException(Util.createStatus(e));
		}
		linkage.new ConfigurePartialSpecialization(this, partial);
	}
	
	public PDOMCPPClassTemplatePartialSpecialization(PDOMLinkage linkage,
			long bindingRecord) {
		super(linkage, bindingRecord);
	}
	
	@Override
	public int getSignatureHash() throws CoreException {
		return getDB().getInt(record + SIGNATURE_HASH);
	}
	
	@Override
	protected int getRecordSize() {
		return RECORD_SIZE;
	}

	@Override
	public int getNodeType() {
		return IIndexCPPBindingConstants.CPP_CLASS_TEMPLATE_PARTIAL_SPEC;
	}

	public PDOMCPPClassTemplatePartialSpecialization getNextPartial() throws CoreException {
		long value = getDB().getRecPtr(record + NEXT_PARTIAL);
		return value != 0 ? new PDOMCPPClassTemplatePartialSpecialization(getLinkage(), value) : null;
	}
	
	public void setNextPartial(PDOMCPPClassTemplatePartialSpecialization partial) throws CoreException {
		long value = partial != null ? partial.getRecord() : 0;
		getDB().putRecPtr(record + NEXT_PARTIAL, value);
	}
	
	@Override
	public ICPPClassTemplate getPrimaryClassTemplate() {
		try {
			return new PDOMCPPClassTemplate(getLinkage(), getDB().getRecPtr(record + PRIMARY));
		} catch (CoreException e) {
			CCorePlugin.log(e);
			return null;
		}
	}
	
	@Override
	public IBinding getSpecializedBinding() {
		return getPrimaryClassTemplate();
	}
	
	@Override
	public void setArguments(ICPPTemplateArgument[] templateArguments) throws CoreException {
		final Database db = getPDOM().getDB();
		long oldRec = db.getRecPtr(record+ARGUMENTS);
		long rec= PDOMCPPArgumentList.putArguments(this, templateArguments);
		db.putRecPtr(record+ARGUMENTS, rec);
		if (oldRec != 0) {
			PDOMCPPArgumentList.clearArguments(this, oldRec);
		}
	}

	@Override
	public ICPPTemplateArgument[] getTemplateArguments() {
		try {
			final long rec= getPDOM().getDB().getRecPtr(record+ARGUMENTS);
			return PDOMCPPArgumentList.getArguments(this, rec);
		} catch (CoreException e) {
			CCorePlugin.log(e);
			return ICPPTemplateArgument.EMPTY_ARGUMENTS;
		}
	}
	
	@Override
	@Deprecated
	public IType[] getArguments() {
		return CPPTemplates.getArguments(getTemplateArguments());
	}
	
	@Override
	public int pdomCompareTo(PDOMBinding other) {
		int cmp = super.pdomCompareTo(other);
		if(cmp==0) {
			if(other instanceof PDOMCPPClassTemplatePartialSpecialization) {
				try {
					PDOMCPPClassTemplatePartialSpecialization otherSpec = (PDOMCPPClassTemplatePartialSpecialization) other;
					int mySM = getSignatureHash();
					int otherSM = otherSpec.getSignatureHash();
					return mySM == otherSM ? 0 : mySM < otherSM ? -1 : 1;
				} catch(CoreException ce) {
					CCorePlugin.log(ce);
				}
			} else {
				assert false;
			}
		}
		return cmp;
	}
	
	@Override
	public ICPPTemplateParameterMap getTemplateParameterMap() {
		return CPPTemplates.createParameterMap(getPrimaryClassTemplate(), getTemplateArguments());
	}
	
	@Override
	public boolean isSameType(IType type) {
		if (type instanceof ITypedef) {
			return type.isSameType(this);
		}
		
		if (type instanceof PDOMNode) {
			PDOMNode node= (PDOMNode) type;
			if (node.getPDOM() == getPDOM()) {
				return node.getRecord() == getRecord();
			}
		}
		
		if (!(type instanceof ICPPClassTemplatePartialSpecialization)) {
			return false;
		}

		final ICPPClassTemplatePartialSpecialization rhs = (ICPPClassTemplatePartialSpecialization)type;
		return CPPClassTemplatePartialSpecialization.isSamePartialClassSpecialization(this, rhs);
	}
	
	@Override
	@Deprecated
	public ObjectMap getArgumentMap() {
		ICPPTemplateParameter[] params = getPrimaryClassTemplate().getTemplateParameters();
		ICPPTemplateArgument[] args= getTemplateArguments();
		int len= Math.min(params.length, args.length);
		ObjectMap result= new ObjectMap(len);
		for (int i = 0; i < len; i++) {
			result.put(params[i], args[i]);
		}
		return ObjectMap.EMPTY_MAP;
	}
}