/*
 * generated by Xtext
 */
package com.framsticks.framclipse.ui.contentassist;

import org.eclipse.jface.text.contentassist.ICompletionProposal;
import org.eclipse.jface.viewers.StyledString;
import org.eclipse.swt.graphics.Image;
import org.eclipse.xtext.resource.IEObjectDescription;
import org.eclipse.xtext.ui.editor.contentassist.ConfigurableCompletionProposal;
import org.eclipse.xtext.ui.editor.contentassist.ContentAssistContext;

import com.framsticks.framclipse.framScript.Proposable;
import com.google.common.base.Function;
import com.google.inject.Inject;

/**
 * see http://www.eclipse.org/Xtext/documentation/latest/xtext.html#contentAssist on how to customize content
 * assistant
 */
public class FramScriptProposalProvider extends AbstractFramScriptProposalProvider {

	@Inject
	private DescriptorProvider descripter;

	@Override
	protected Function<IEObjectDescription, ICompletionProposal> getProposalFactory(String ruleName,
			ContentAssistContext contentAssistContext) {
		return new FramScriptProposalCreator(contentAssistContext, ruleName);
	}

	protected class FramScriptProposalCreator extends DefaultProposalCreator {

		private final ContentAssistContext cac;

		protected FramScriptProposalCreator(ContentAssistContext contentAssistContext, String ruleName) {
			super(contentAssistContext, ruleName);
			this.cac = contentAssistContext;
		}

		public ICompletionProposal apply(IEObjectDescription candidate) {
			if (candidate != null && candidate.getEObjectOrProxy() instanceof Proposable) {
				return createCompletionProposal((Proposable) candidate.getEObjectOrProxy(), cac);
			} else {
				return super.apply(candidate);
			}
		}

	}

	public ICompletionProposal createCompletionProposal(Proposable proposable,
			ContentAssistContext contentAssistContext) {
		String proposal = proposable.proposal();
		StyledString display = descripter.display(proposable.display());
		String description = descripter.description(proposable.description());
		Image image = getLabelProvider().getImage(proposable);

		ConfigurableCompletionProposal p = (ConfigurableCompletionProposal) createCompletionProposal(
				proposal, display, image, contentAssistContext);
		if (p != null) {
			p.setAutoInsertable(true);
			p.setAdditionalProposalInfo(description);
			getPriorityHelper().adjustCrossReferencePriority(p, contentAssistContext.getPrefix());
		}
		return p;
	}
}