/**

 * Copyright (c) 2010 Symbian Foundation and/or its subsidiary(-ies).

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Symbian Foundation - initial contribution.

 * Contributors:

 * Description:

 * Overview:

 * Details:

 * Platforms/Drives/Compatibility:

 * Assumptions/Requirement/Pre-requisites:

 * Failures and causes:

 */

package org.symbian.tools.tmw.internal.ui.project;

import java.util.Collection;

import java.util.Collections;

import java.util.HashMap;

import java.util.Map;

import java.util.TreeMap;

import org.eclipse.core.runtime.IConfigurationElement;

import org.eclipse.core.runtime.Platform;

import org.symbian.tools.tmw.core.TMWCore;

import org.symbian.tools.tmw.core.runtimes.IMobileWebRuntime;

import org.symbian.tools.tmw.ui.TMWCoreUI;

import org.symbian.tools.tmw.ui.project.IProjectTemplate;

import org.symbian.tools.tmw.ui.project.IProjectTemplateManager;

import org.symbian.tools.tmw.ui.project.ITemplateInstaller;

public class ProjectTemplateManagerImpl implements IProjectTemplateManager {

    private Map<IMobileWebRuntime, ITemplateInstaller> emptyProjects;

    private Map<IMobileWebRuntime, Map<String, String>> runtimeTemplateParameters;

    private Map<IMobileWebRuntime, IProjectTemplate[]> templates;

    public IProjectTemplate getDefaultTemplate(IMobileWebRuntime runtime) {

        final IProjectTemplate[] projectTemplates = getProjectTemplates(runtime);

        return projectTemplates != null && projectTemplates.length > 0 ? projectTemplates[0] : null;

    }

    public ITemplateInstaller getEmptyProjectTemplate(IMobileWebRuntime runtime) {

        if (emptyProjects == null) {

            readExtensions();

        }

        return emptyProjects.get(runtime);

    }

    public IProjectTemplate[] getProjectTemplates(IMobileWebRuntime runtime) {

        if (runtime == null) {

            return new IProjectTemplate[0];

        }

        if (templates == null) {

            templates = readExtensions();

        }

        final IProjectTemplate[] runtimeTemplates = templates.get(runtime);

        return runtimeTemplates == null ? new IProjectTemplate[0] : runtimeTemplates;

    }

    private Map<IMobileWebRuntime, IProjectTemplate[]> readExtensions() {

        runtimeTemplateParameters = new HashMap<IMobileWebRuntime, Map<String, String>>();

        emptyProjects = new HashMap<IMobileWebRuntime, ITemplateInstaller>();

        final Map<IMobileWebRuntime, Collection<IProjectTemplate>> map = new HashMap<IMobileWebRuntime, Collection<IProjectTemplate>>();

        final IConfigurationElement[] elements = Platform.getExtensionRegistry().getConfigurationElementsFor(

                TMWCoreUI.PLUGIN_ID, "projectTemplate");

        for (IConfigurationElement element : elements) {

            if ("template".equals(element.getName())) {

                final ProjectTemplateImpl template = new ProjectTemplateImpl(element);

                final IMobileWebRuntime[] supportedRuntimes = template.getSupportedRuntimes();

                for (IMobileWebRuntime runtime : supportedRuntimes) {

                    Collection<IProjectTemplate> tmplts = map.get(runtime);

                    if (tmplts == null) {

                        map.put(runtime, tmplts);

                    }

                    tmplts.add(template);

                }

            } else if ("runtime-template".equals(element.getName())) {

                final String runtimeId = element.getAttribute("runtime-id");

                final String runtimeVersion = element.getAttribute("version");

                final IMobileWebRuntime runtime = TMWCore.getRuntimesManager().getRuntime(runtimeId, runtimeVersion);

                if (runtime != null) {

                    emptyProjects.put(runtime,

                            CompoundInstaller.combine(emptyProjects.get(runtime), element.getChildren()));

                    Map<String, String> params = runtimeTemplateParameters.get(runtime);

                    if (params == null) {

                        params = new TreeMap<String, String>();

                        runtimeTemplateParameters.put(runtime, params);

                    }

                    for (IConfigurationElement el : element.getChildren()) {

                        if ("default-parameter-value".equals(el.getName())) {

                            params.put(el.getAttribute("name"), el.getAttribute("value"));

                        }

                    }

                }

            }

        }

        final Map<IMobileWebRuntime, IProjectTemplate[]> res = new HashMap<IMobileWebRuntime, IProjectTemplate[]>(

                map.size());

        for (Map.Entry<IMobileWebRuntime, Collection<IProjectTemplate>> entry : map.entrySet()) {

            final Collection<IProjectTemplate> collection = entry.getValue();

            res.put(entry.getKey(), collection.toArray(new IProjectTemplate[collection.size()]));

        }

        return res;

    }

    public Map<String, String> getDefaultTemplateParameterValues(IMobileWebRuntime runtime) {

        if (runtimeTemplateParameters == null) {

            readExtensions();

        }

        Map<String, String> params = runtimeTemplateParameters.get(runtime);

        if (params == null) {

            return Collections.emptyMap();

        }

        return params;

    }

}