// 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) {
        Script script = resourceToScript.get(resource);
        return script != null ? VmResourceId.forScript(script) : null;
    }

    public Script getScript(IFile file) {
        return resourceToScript.get(file);
    }
}