/*******************************************************************************
 * 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.core.model.internal;

import java.lang.ref.SoftReference;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.dltk.ast.declarations.ModuleDeclaration;
import org.eclipse.dltk.ast.parser.ISourceParser;
import org.eclipse.dltk.compiler.env.IModuleSource;
import org.eclipse.dltk.core.DLTKLanguageManager;
import org.eclipse.dltk.core.IModelElement;
import org.eclipse.dltk.core.IParent;
import org.eclipse.dltk.core.IScriptProject;
import org.eclipse.dltk.core.ISourceModule;
import org.eclipse.dltk.core.ModelException;
import org.eclipse.dltk.ruby.core.RubyNature;
import org.eclipse.dltk.ruby.core.model.ASTCaching;
import org.eclipse.dltk.ruby.core.model.IElement;
import org.eclipse.dltk.ruby.core.model.IElementCriteria;
import org.eclipse.dltk.ruby.core.model.IElementKind;
import org.eclipse.dltk.ruby.core.model.IModel;

public class Model implements IModel {

	private final IScriptProject project;

	private final Map<ISourceModule, SoftReference<ModuleDeclaration>> sourceModulesToASTs = new HashMap<ISourceModule, SoftReference<ModuleDeclaration>>();

	public Model(IScriptProject project) {
		this.project = project;
	}

	@Override
	public ModuleDeclaration getASTNode(ISourceModule sourceModule,
			ASTCaching caching) {
		ModuleDeclaration result = null;
		SoftReference<ModuleDeclaration> astNode = sourceModulesToASTs
				.get(sourceModule);
		if (astNode != null && caching != ASTCaching.REPARSE)
			result = astNode.get();
		if (result == null && caching != ASTCaching.CACHED_ONLY) {
			ISourceParser parser = DLTKLanguageManager
					.getSourceParser(RubyNature.NATURE_ID);
			result = (ModuleDeclaration) parser.parse(
					(IModuleSource) sourceModule, null);
			if (result != null) {
				astNode = new SoftReference<ModuleDeclaration>(result);
				sourceModulesToASTs.put(sourceModule, astNode);
			}
		}
		return result;
	}

	public ISourceModule[] search(String name) {
		Collection<ISourceModule> sourceModules = new ArrayList<ISourceModule>();
		try {
			IModelElement[] children = project.getChildren();
			addModules(sourceModules, children);
		} catch (ModelException e) {
			e.printStackTrace();
		}
		return sourceModules.toArray(new ISourceModule[sourceModules.size()]);
	}

	private void addModules(Collection<ISourceModule> sourceModules, IModelElement[] children)
			throws ModelException {
		for (int i = 0; i < children.length; i++) {
			IModelElement element = children[i];
			if (element instanceof ISourceModule)
				sourceModules.add((ISourceModule) element);
			else if (element instanceof IParent)
				addModules(sourceModules, ((IParent) element).getChildren());
		}
	}

	@Override
	public IElement[] findChildren(IElementCriteria criteria, String name,
			IProgressMonitor pm) {
		if (criteria == IElementCriteria.CLASS_OR_MIXIN) {

		}
		return null;
	}

	@Override
	public IElement getAncestor(IElementCriteria criteria) {
		return null;
	}

	@Override
	public IElementKind getElementKind() {
		return IElementKind.MODEL;
	}

}