/*
* generated by Xtext
*/
package org.eclipse.papyrus.uml.textedit.transition.xtext.ui.contentassist;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.emf.ecore.EObject;
import org.eclipse.jface.text.contentassist.CompletionProposal;
import org.eclipse.jface.text.contentassist.ICompletionProposal;
import org.eclipse.papyrus.uml.textedit.transition.xtext.scoping.UmlTransitionScopeProvider;
import org.eclipse.papyrus.uml.textedit.transition.xtext.ui.contentassist.AbstractUmlTransitionProposalProvider;
import org.eclipse.papyrus.uml.textedit.transition.xtext.umlTransition.CallOrSignalEventRule;
import org.eclipse.papyrus.uml.textedit.transition.xtext.umlTransition.EventRule;
import org.eclipse.papyrus.uml.textedit.transition.xtext.umlTransition.TransitionRule;
import org.eclipse.uml2.uml.NamedElement;
import org.eclipse.uml2.uml.Operation;
import org.eclipse.xtext.RuleCall;
import org.eclipse.xtext.gmf.glue.edit.part.PopupXtextEditorHelper;
import org.eclipse.xtext.ui.editor.contentassist.ContentAssistContext;
import org.eclipse.xtext.ui.editor.contentassist.ICompletionProposalAcceptor;
/**
 * see http://www.eclipse.org/Xtext/documentation/latest/xtext.html#contentAssist on how to customize content assistant
 */
public class UmlTransitionProposalProvider extends AbstractUmlTransitionProposalProvider {

	@Override
	public void complete_CallOrSignalEventRule(EObject model,
			RuleCall ruleCall, ContentAssistContext context,
			ICompletionProposalAcceptor acceptor) {
		// TODO Auto-generated method stub
		TransitionRule rule = (TransitionRule) model ;
		List<EObject> operationAndSignals = UmlTransitionScopeProvider.getVisibleOperationAndSignals(PopupXtextEditorHelper.context) ;
		List<EObject> alreadyUsedOperationAndSignals = new ArrayList<EObject>();
		if (rule != null && rule.getTriggers() != null && ! rule.getTriggers().isEmpty()) {
			List<EventRule> eventRules = rule.getTriggers() ;
			for (EventRule eventRule : eventRules) {
				if (eventRule instanceof CallOrSignalEventRule) {
					CallOrSignalEventRule callOrSignalEventRule = (CallOrSignalEventRule) eventRule ;
					if (callOrSignalEventRule.getOperationOrSignal() != null)
						alreadyUsedOperationAndSignals.add(callOrSignalEventRule.getOperationOrSignal()) ;
				}
			}
		}
		operationAndSignals.removeAll(alreadyUsedOperationAndSignals) ;
		for (EObject o : operationAndSignals) {
			NamedElement opOrSignal = (NamedElement) o ;
			if (opOrSignal.getName().startsWith(context.getPrefix())) {
				String completionString = opOrSignal.getName().substring(context.getPrefix().length()) ;
				ICompletionProposal completionProposal = new CompletionProposal(completionString, 	// String to be inserted 
															context.getOffset(),  					// Offset
															context.getSelectedText().length(),		// Replacement length
															completionString.length(),				// cursorPosition
															null						,			// image
															opOrSignal.getName() + " - " + (opOrSignal instanceof Operation ? "Operation" : "Signal"),		// displayString
															null							,		// contextInformation
															(opOrSignal instanceof Operation ? "Operation associated with the CallEvent of this trigger" : "Signal associated with the SignalEvent of this trigger")									// additionalProposalInfo
															);
			//acceptor.accept(new CompletionProposal(replacementString, replacementOffset, replacementLength, cursorPosition, image, displayString, contextInformation, additionalProposalInfo))
				acceptor.accept(completionProposal) ;
			}
		}
	}

	
	
}