/**

 * 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.ArrayList;

import java.util.Arrays;

import java.util.Collection;

import java.util.HashSet;

import java.util.LinkedList;

import java.util.List;

import org.eclipse.core.resources.IProject;

import org.eclipse.core.runtime.CoreException;

import org.eclipse.core.runtime.IConfigurationElement;

import org.eclipse.core.runtime.IPath;

import org.eclipse.core.runtime.IProgressMonitor;

import org.eclipse.core.runtime.SubProgressMonitor;

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

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

public class CompoundInstaller implements ITemplateInstaller {

    private final class InstallerFiles {

        private final ITemplateInstaller installer;

        private final Collection<IPath> paths;

        public InstallerFiles(Collection<IPath> paths, ITemplateInstaller installer) {

            this.paths = paths;

            this.installer = installer;

        }

    }

    public static ITemplateInstaller combine(ITemplateInstaller installer, IConfigurationElement[] elements) {

        final ITemplateInstaller[] installers = getChildren(installer);

        final Collection<ITemplateInstaller> installerCollection = new ArrayList<ITemplateInstaller>(installers.length

                + elements.length);

        installerCollection.addAll(Arrays.asList(installers));

        installerCollection.addAll(fromExtensions(elements));

        return new CompoundInstaller(installerCollection.toArray(new ITemplateInstaller[installerCollection.size()]));

    }

    public static ITemplateInstaller combine(ITemplateInstaller installer1, ITemplateInstaller installer2) {

        final ITemplateInstaller[] children1 = getChildren(installer1);

        final ITemplateInstaller[] children2 = getChildren(installer2);

        final ITemplateInstaller[] result = new ITemplateInstaller[children1.length + children2.length];

        System.arraycopy(children1, 0, result, 0, children1.length);

        System.arraycopy(children2, 0, result, children1.length, children2.length);

        return new CompoundInstaller(result);

    }

    private static Collection<? extends ITemplateInstaller> fromExtensions(IConfigurationElement[] elements) {

        final Collection<ITemplateInstaller> result = new LinkedList<ITemplateInstaller>();

        for (IConfigurationElement element : elements) {

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

                result.add(new LazyInstaller(element));

            } else if ("archive".equals(element.getName())) {

                result.add(new ZipInstaller(element));

            }

        }

        return result;

    }

    private static ITemplateInstaller[] getChildren(ITemplateInstaller installer) {

        final ITemplateInstaller[] installers;

        if (installer == null) {

            installers = new ITemplateInstaller[0];

        } else if (installer instanceof CompoundInstaller) {

            installers = ((CompoundInstaller) installer).installers;

        } else {

            installers = new ITemplateInstaller[] { installer };

        }

        return installers;

    }

    private final Collection<InstallerFiles> files = new LinkedList<CompoundInstaller.InstallerFiles>();

    private final ITemplateInstaller[] installers;

    private CompoundInstaller(ITemplateInstaller[] installers) {

        this.installers = installers;

    }

    public void cleanup() {

        for (ITemplateInstaller installer : installers) {

            installer.cleanup();

        }

    }

    public void copyFiles(IPath[] files, IProgressMonitor monitor) throws CoreException {

        monitor.beginTask("Copying files", files.length * 10);

        final List<IPath> list = Arrays.asList(files);

        for (InstallerFiles fs : this.files) {

            final ITemplateInstaller installer = fs.installer;

            fs.paths.retainAll(list);

            IPath[] array = fs.paths.toArray(new IPath[fs.paths.size()]);

            installer.copyFiles(array, new SubProgressMonitor(monitor, array.length * 10));

        }

        monitor.done();

    }

    public IPath[] getFiles() throws CoreException {

        final Collection<IPath> paths = new HashSet<IPath>();

        for (ITemplateInstaller installer : installers) {

            final IPath[] f = installer.getFiles();

            final Collection<IPath> c = new HashSet<IPath>(Arrays.asList(f));

            c.removeAll(paths);

            files.add(new InstallerFiles(c, installer));

            paths.addAll(c);

        }

        return paths.toArray(new IPath[paths.size()]);

    }

    public void prepare(IProject project, IProjectTemplateContext context) {

        for (ITemplateInstaller installer : installers) {

            installer.prepare(project, context);

        }

    }

}