/**

 * 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.ui;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.Writer;

import org.eclipse.core.resources.IFile;

import org.eclipse.core.runtime.CoreException;

import org.eclipse.core.runtime.Path;

import org.eclipse.ui.IMemento;

import org.eclipse.ui.XMLMemento;

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

import org.symbian.tools.tmw.core.projects.ITMWProject;

import org.symbian.tools.tmw.ui.deployment.IDeploymentTarget;

import org.symbian.tools.tmw.ui.deployment.IDeploymentTargetType;

public class ProjectMemo {

    private static final String TARGET_TYPE = "typeId";

    private static final String TARGET = "targetId";

    private static final String TARGET_CONFIGURATION = "target";

    private static final String MEMO_TYPE = "deployment";

    private final ITMWProject project;

    private XMLMemento memento;

    public ProjectMemo(ITMWProject project) {

        this.project = project;

    }

    public synchronized void setDeploymentTarget(String providerId, IDeploymentTarget target) {

        try {

            checkMemento();

            memento.putString(TARGET_TYPE, providerId);

            memento.putString(TARGET, target.getId());

            IMemento child = null;

            IMemento[] children = memento.getChildren(TARGET_CONFIGURATION);

            for (IMemento memento : children) {

                if (providerId.equals(memento.getString(TARGET_TYPE))

                        && target.getId().equals(memento.getString(TARGET))) {

                    child = memento;

                }

            }

            if (child == null) {

                child = memento.createChild(TARGET_CONFIGURATION);

                child.putString(TARGET_TYPE, providerId);

                child.putString(TARGET, target.getId());

            }

            target.save(child);

            saveMemento();

        } catch (CoreException e) {

            TMWCoreUI.log(e);

        } catch (IOException e) {

            TMWCoreUI.log(e);

        }

    }

    private void saveMemento() throws IOException, CoreException {

        ByteArrayOutputStream os = new ByteArrayOutputStream();

        final Writer writer = new OutputStreamWriter(os);

        memento.save(writer);

        writer.close();

        final InputStream stream = new ByteArrayInputStream(os.toByteArray());

        IFile file = getMemoFile();

        if (file.exists()) {

            file.setContents(stream, IFile.KEEP_HISTORY, null);

        } else {

            file.create(stream, false, null);

        }

    }

    private IFile getMemoFile() {

        return project.getProject().getFile(new Path(".settings").append(TMWCoreUI.PLUGIN_ID).addFileExtension("xml"));

    }

    private void checkMemento() throws CoreException, IOException {

        IFile memoFile = getMemoFile();

        if (memoFile.exists()) {

            memento = XMLMemento.createReadRoot(new InputStreamReader(memoFile.getContents(), memoFile.getCharset()));

        } else {

            memento = XMLMemento.createWriteRoot(MEMO_TYPE);

        }

    }

    public IDeploymentTarget getPreviousDeploymentTarget() {

        try {

            checkMemento();

            String type = memento.getString(TARGET_TYPE);

            if (type != null) {

                final IDeploymentTargetType provider = TMWCoreUI.getDefault().getDeploymentTypesRegistry()

                        .getType(type);

                if (provider != null) {

                    IDeploymentTarget target = provider.findTarget(project, memento.getString(TARGET));

                    if (target != null) {

                        return target;

                    }

                }

            }

        } catch (CoreException e) {

            TMWCoreUI.log(e);

        } catch (IOException e) {

            TMWCoreUI.log(e);

        }

        return null;

    }

    public IMemento getMemo(String targetType, IDeploymentTarget target) {

        if (memento != null) {

            IMemento[] children = memento.getChildren(TARGET_CONFIGURATION);

            for (IMemento memento : children) {

                if (targetType.equals(memento.getString(TARGET_TYPE))

                        && target.getId().equals(memento.getString(TARGET))) {

                    return memento;

                }

            }

        }

        return null;

    }

    public void setAttribute(String name, String value) {

        try {

            checkMemento();

            memento.putString(name, value);

            saveMemento();

        } catch (CoreException e) {

            TMWCoreUI.log(e);

        } catch (IOException e) {

            TMWCoreUI.log(e);

        }

    }

    public String getAttribute(String name) {

        try {

            checkMemento();

        } catch (CoreException e) {

            TMWCore.log(null, e);

        } catch (IOException e) {

            TMWCore.log(null, e);

        }

        if (memento != null) {

            return memento.getString(name);

        }

        return null;

    }

}