/**
 *  Copyright (c) 2013-2016 Angelo ZERR and Genuitec LLC.
 *  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:
 *  Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation
 *  Piotr Tomiak <piotr@genuitec.com> - unified completion proposals calculation
 */
package tern.eclipse.ide.ui.contentassist;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.ProjectScope;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.preferences.DefaultScope;
import org.eclipse.core.runtime.preferences.IPreferencesService;
import org.eclipse.core.runtime.preferences.IScopeContext;
import org.eclipse.core.runtime.preferences.InstanceScope;

import tern.eclipse.ide.internal.ui.preferences.TernUIPreferenceConstants;
import tern.eclipse.ide.ui.TernUIPlugin;
import tern.server.protocol.completions.TernCompletionsQuery;

public class TernCompletionsQueryFactory {

	private TernCompletionsQueryFactory() {
	}

	public static TernCompletionsQuery createQuery(IProject project, 
			String file, int pos) {
		TernCompletionsQuery query = new TernCompletionsQuery(file, pos);

		query.setTypes(true);
		query.setDocs(true);
		query.setUrls(true);
		query.setOrigins(true);
		query.setCaseInsensitive(true);
		query.setLineCharPositions(false);
		query.setExpandWordForward(false);

		IPreferencesService preferencesService = Platform
				.getPreferencesService();
		IScopeContext[] lookupOrder;

		if (project != null) {
			lookupOrder = new IScopeContext[] { new ProjectScope(project),
					InstanceScope.INSTANCE, DefaultScope.INSTANCE };
		} else {
			lookupOrder = new IScopeContext[] { InstanceScope.INSTANCE,
					DefaultScope.INSTANCE };
		}

		boolean omitObjectPrototype = getBoolean(
				TernUIPreferenceConstants.OMIT_OBJECT_PROTOTYPE_CONTENT_ASSIST,
				preferencesService, lookupOrder);
		if (!omitObjectPrototype) {
			query.setOmitObjectPrototype(omitObjectPrototype);
		}
		boolean guess = getBoolean(
				TernUIPreferenceConstants.GUESS_CONTENT_ASSIST,
				preferencesService, lookupOrder);
		if (!guess) {
			query.setGuess(guess);
		}
		return query;
	}

	protected static boolean getBoolean(String key,
			IPreferencesService preferencesService, IScopeContext[] lookupOrder) {
		return preferencesService.getBoolean(TernUIPlugin.getDefault()
				.getBundle().getSymbolicName(), key, true, lookupOrder);
	}
}