/*******************************************************************************
 * Copyright (c) 2003, 2004 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
 * 
 * Contributors:
 * IBM Corporation - initial API and implementation
 *******************************************************************************/
/*
 * Created on Mar 30, 2004
 *
 * To change the template for this generated file go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
package org.eclipse.jst.j2ee.internal.deploy;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;

import org.eclipse.core.resources.IProject;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jst.j2ee.internal.earcreation.IEARNatureConstants;
import org.eclipse.jst.j2ee.internal.project.J2EENature;
import org.eclipse.wst.common.emf.utilities.ICommand;
import org.eclipse.wst.server.core.IRuntime;

import com.ibm.wtp.emf.workbench.ProjectUtilities;

/**
 * @author cbridgha
 * 
 * To change the template for this generated type comment go to Window - Preferences - Java - Code
 * Generation - Code and Comments
 */
public class DeployerRegistry {
	/**
	 *  
	 */
	private static DeployerRegistry INSTANCE;
	private HashMap deployModuleExtensions = new HashMap();

	public DeployerRegistry() {
		super();
	}

	/**
	 * @param deployer
	 * @param serverTarget
	 * @param natureID
	 */
	public void register(ICommand deployer, List serverTargets, List natures) {

		HashMap targetDeployers;
		for (Iterator iter = natures.iterator(); iter.hasNext();) {
			String natureID = (String) iter.next();
			for (Iterator iterator = serverTargets.iterator(); iterator.hasNext();) {
				String runtimeID = (String) iterator.next();
				targetDeployers = getDeployModuleExtensions(natureID);
				getTargetDeployers(targetDeployers, runtimeID).add(deployer);
			}
		}


	}

	private List getDeployers(String natureID, String serverTarget) {
		HashMap targetDeployers = getDeployModuleExtensions(natureID);
		return getTargetDeployers(targetDeployers, serverTarget);
	}

	public static DeployerRegistry instance() {
		if (INSTANCE == null) {
			INSTANCE = new DeployerRegistry();
			readRegistry();
		}
		return INSTANCE;
	}

	/**
	 *  
	 */
	private static void readRegistry() {
		DeployerRegistryReader reader = new DeployerRegistryReader();
		reader.readRegistry();
	}

	/**
	 * @return
	 */
	public static List getSelectedModules(Object[] mySelections) {
		List modules = new ArrayList();
		for (int i = 0; i < mySelections.length; i++) {
			Object object = mySelections[i];
			if (object instanceof EObject) {
				object = ProjectUtilities.getProject(object);
			}
			if (object instanceof IProject) {
				J2EENature nature = J2EENature.getRegisteredRuntime((IProject) object);
				if (nature == null)
					continue;
				if (modules.contains(nature.getDeploymentDescriptorRoot()))
					continue;
				// Order Ears first...
				if (nature.getNatureID().equals(IEARNatureConstants.NATURE_ID))
					modules.add(0, nature.getDeploymentDescriptorRoot());
				else
					modules.add(nature.getDeploymentDescriptorRoot());
			}
		}
		return modules;
	}

	/**
	 * @param targetDeployers
	 * @param serverTarget
	 */
	private List getTargetDeployers(HashMap targetDeployers, String serverTarget) {
		if (targetDeployers.get(serverTarget) == null)
			targetDeployers.put(serverTarget, new ArrayList());
		return (List) targetDeployers.get(serverTarget);

	}

	/**
	 * @param natureID
	 * @return
	 */
	private HashMap getDeployModuleExtensions(String natureID) {

		if (getDeployModuleExtensions().get(natureID) == null)
			getDeployModuleExtensions().put(natureID, new HashMap());
		return (HashMap) getDeployModuleExtensions().get(natureID);
	}

	/**
	 * @return Returns the deployExtensions.
	 */
	public HashMap getDeployModuleExtensions() {
		return deployModuleExtensions;
	}

	/**
	 * @param deployExtensions
	 *            The deployExtensions to set.
	 */
	public void setDeployModuleExtensions(HashMap deployExtensions) {
		this.deployModuleExtensions = deployExtensions;
	}

	/**
	 * @param module
	 * @param runtime
	 * @return
	 */
	public List getDeployModuleExtensions(EObject module, IRuntime runtime) {

		IProject proj = ProjectUtilities.getProject(module);
		String natureID = J2EENature.getRegisteredRuntime(proj).getNatureID();
		String runtimeID = runtime.getRuntimeType().getId();
		return getDeployers(natureID, runtimeID);
	}
}