/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.sdkuilib.internal.repository.icons;

import com.android.sdklib.internal.repository.Archive;
import com.android.sdklib.internal.repository.Package;
import com.android.sdklib.internal.repository.SdkSource;
import com.android.sdklib.internal.repository.SdkSourceCategory;
import com.android.sdkuilib.internal.repository.sdkman1.RepoSourcesAdapter;

import org.eclipse.swt.SWTException;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;

import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;


/**
 * An utility class to serve {@link Image} correspond to the various icons
 * present in this package and dispose of them correctly at the end.
 */
public class ImageFactory {

    private final Display mDisplay;
    private final Map<String, Image> mImages = new HashMap<String, Image>();

    public ImageFactory(Display display) {
        mDisplay = display;
    }

    /**
     * Loads an image given its filename (with its extension).
     * Might return null if the image cannot be loaded.
     * The image is cached. Successive calls will return the <em>same</em> object.
     *
     * @param imageName The filename (with extension) of the image to load.
     * @return A new or existing {@link Image}. The caller must NOT dispose the image (the
     *  image will disposed by {@link #dispose()}). The returned image can be null if the
     *  expected file is missing.
     */
    public Image getImageByName(String imageName) {

        Image image = mImages.get(imageName);
        if (image != null) {
            return image;
        }

        InputStream stream = getClass().getResourceAsStream(imageName);
        if (stream != null) {
            try {
                image = new Image(mDisplay, stream);
            } catch (SWTException e) {
                // ignore
            } catch (IllegalArgumentException e) {
                // ignore
            }
        }

        // Store the image in the hash, even if this failed. If it fails now, it will fail later.
        mImages.put(imageName, image);

        return image;
    }

    /**
     * Loads and returns the appropriate image for a given package, archive or source object.
     * The image is cached. Successive calls will return the <em>same</em> object.
     *
     * @param object A {@link SdkSource} or {@link Package} or {@link Archive}.
     * @return A new or existing {@link Image}. The caller must NOT dispose the image (the
     *  image will disposed by {@link #dispose()}). The returned image can be null if the
     *  object is of an unknown type.
     */
    public Image getImageForObject(Object object) {

        if (object == null) {
            return null;
        }

        if (object instanceof Image) {
            return (Image) object;
        }

        String clz = object.getClass().getSimpleName();
        if (clz.endsWith(Package.class.getSimpleName())) {
            String name = clz.replaceFirst(Package.class.getSimpleName(), "")   //$NON-NLS-1$
                             .replace("SystemImage", "sysimg")    //$NON-NLS-1$ //$NON-NLS-2$
                             .toLowerCase();
            name += "_pkg_16.png";                                              //$NON-NLS-1$
            return getImageByName(name);
        }

        if (object instanceof SdkSourceCategory) {
            return getImageByName("source_cat_icon16.png");                     //$NON-NLS-1$

        } else if (object instanceof SdkSource) {
            return getImageByName("source_icon16.png");                         //$NON-NLS-1$

        } else if (object instanceof RepoSourcesAdapter.RepoSourceError) {
            return getImageByName("error_icon16.png");                          //$NON-NLS-1$

        } else if (object instanceof RepoSourcesAdapter.RepoSourceEmpty) {
            return getImageByName("nopkg_icon16.png");                          //$NON-NLS-1$
        }

        if (object instanceof Archive) {
            if (((Archive) object).isCompatible()) {
                return getImageByName("archive_icon16.png");                    //$NON-NLS-1$
            } else {
                return getImageByName("incompat_icon16.png");                   //$NON-NLS-1$
            }
        }

        if (object instanceof String) {
            return getImageByName((String) object);
        }

        return null;
    }

    /**
     * Dispose all the images created by this factory so far.
     */
    public void dispose() {
        Iterator<Image> it = mImages.values().iterator();
        while(it.hasNext()) {
            Image img = it.next();
            if (img != null && img.isDisposed() == false) {
                img.dispose();
            }
            it.remove();
        }
    }

}
