/*******************************************************************************
 * Copyright (c) 2005, 2016 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.ruby.internal.parser.mixin;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.core.runtime.Assert;
import org.eclipse.dltk.core.IScriptProject;
import org.eclipse.dltk.core.IShutdownListener;
import org.eclipse.dltk.core.mixin.IMixinElement;
import org.eclipse.dltk.core.mixin.MixinModel;
import org.eclipse.dltk.ruby.core.RubyLanguageToolkit;
import org.eclipse.dltk.ruby.core.RubyPlugin;
import org.eclipse.dltk.ruby.typeinference.RubyClassType;

public class RubyMixinModel implements IShutdownListener {

	private static RubyMixinModel instance;

	public static RubyMixinModel getWorkspaceInstance() {
		synchronized (instances) {
			if (instance == null)
				instance = new RubyMixinModel(null);
			return instance;
		}
	}

	private static final Map<IScriptProject, RubyMixinModel> instances = new HashMap<IScriptProject, RubyMixinModel>();

	public static synchronized RubyMixinModel getInstance(IScriptProject project) {
		Assert.isNotNull(project);
		synchronized (instances) {
			RubyMixinModel mixinModel = instances.get(project);
			if (mixinModel == null) {
				mixinModel = new RubyMixinModel(project);
				instances.put(project, mixinModel);
			}
			return mixinModel;
		}
	}

	/**
	 * @param key
	 * @return
	 */
	public static void clearKeysCache(String key) {
		final RubyMixinModel[] models;
		synchronized (instances) {
			if (instance != null) {
				instance.getRawModel().clearKeysCache(key);
			}
			models = instances.values().toArray(
					new RubyMixinModel[instances.size()]);
		}
		for (RubyMixinModel mixinModel : models) {
			mixinModel.getRawModel().clearKeysCache(key);
		}
	}

	private final MixinModel model;

	private RubyMixinModel(IScriptProject project) {
		model = new MixinModel(RubyLanguageToolkit.getDefault(), project);
		RubyPlugin.getDefault().addShutdownListener(this);
	}

	public MixinModel getRawModel() {
		return model;
	}

	public RubyMixinClass createRubyClass(RubyClassType type) {
		return (RubyMixinClass) createRubyElement(type.getModelKey());
	}

	public IRubyMixinElement createRubyElement(String key) {
		if (key.equals("Object")) { //$NON-NLS-1$
			return new RubyObjectMixinClass(this, true);
		} else if (key.equals("Object%")) { //$NON-NLS-1$
			return new RubyObjectMixinClass(this, false);
		}
		IMixinElement mixinElement = model.get(key);
		if (mixinElement != null) {
			return createRubyElement(mixinElement);
		}
		return null;
	}

	public IRubyMixinElement createRubyElement(IMixinElement element) {
		Assert.isNotNull(element);
		if (element.getKey().equals("Object")) { //$NON-NLS-1$
			return new RubyObjectMixinClass(this, true);
		} else if (element.getKey().equals("Object%")) { //$NON-NLS-1$
			return new RubyObjectMixinClass(this, false);
		}
		Object[] objects = element.getAllObjects();
		if (objects == null)
			return null;
		for (int i = 0; i < objects.length; i++) {
			RubyMixinElementInfo obj = (RubyMixinElementInfo) objects[i];
			if (obj == null || obj.getObject() == null)
				continue;
			switch (obj.getKind()) {
			case RubyMixinElementInfo.K_CLASS:
			case RubyMixinElementInfo.K_SUPER:
			case RubyMixinElementInfo.K_VIRTUAL:
				return new RubyMixinClass(this, element.getKey(), false);
			case RubyMixinElementInfo.K_MODULE:
				return new RubyMixinClass(this, element.getKey(), true);
			case RubyMixinElementInfo.K_METHOD:
				return new RubyMixinMethod(this, element.getKey());
			case RubyMixinElementInfo.K_ALIAS:
				return new RubyMixinAlias(this, element.getKey());
			case RubyMixinElementInfo.K_VARIABLE:
				return new RubyMixinVariable(this, element.getKey());
			}
		}
		return null;
	}

	@Override
	public void shutdown() {
		model.stop();
	}
}