// Copyright (c) 2009 The Chromium Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

package org.symbian.tools.tmw.debug.internal.model;

import java.util.HashMap;

import java.util.Map;

import org.chromium.debug.core.model.VmResourceId;

import org.chromium.sdk.Script;

import org.eclipse.core.resources.IFile;

import org.symbian.tools.tmw.previewer.PreviewerPlugin;

/**

 * This object handles the mapping between {@link Script}s and their

 * corresponding resources inside Eclipse.

 */

public class ResourceManager {

    private final Map<IFile, Script> resourceToScript = new HashMap<IFile, Script>();

    private final Map<VmResourceId, IFile> scriptIdToResource = new HashMap<VmResourceId, IFile>();

    public synchronized void addScript(Script script) {

        IFile scriptFile = getResource(script);

        if (scriptFile == null) {

            scriptFile = getFile(script.getName());

            if (scriptFile != null) {

                VmResourceId scriptId = VmResourceId.forScript(script);

                resourceToScript.put(scriptFile, script);

                scriptIdToResource.put(scriptId, scriptFile);

            }

        }

    }

    public synchronized void clear() {

        resourceToScript.clear();

        scriptIdToResource.clear();

    }

    private IFile getFile(String name) {

        if (name == null) {

            return null;

        }

        IFile file = PreviewerPlugin.getDefault().getHttpPreviewer().getFileFromUrl(name);

        if (file != null && !file.isAccessible()) {

            file = null;

        }

        return file;

    }

    public synchronized IFile getResource(Script script) {

        return scriptIdToResource.get(VmResourceId.forScript(script));

    }

    public synchronized boolean scriptHasResource(Script script) {

        return getResource(script) != null;

    }

    public String translateResourceToScript(IFile resource) {

        return PreviewerPlugin.getDefault().getHttpPreviewer().getHttpUrl(resource);

    }

    public VmResourceId findVmResource(IFile resource) {

        final Script script = resourceToScript.get(resource);

        if (script != null) {

            return VmResourceId.forScript(script);

        } else {

            return null;

        }

    }

    public Script getScript(IFile file) {

        return resourceToScript.get(file);

    }

}