/*
 * Copyright (C) 2012 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.gallery3d.filtershow.filters;

import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.widget.Toast;

import com.android.gallery3d.filtershow.FilterShowActivity;
import com.android.gallery3d.filtershow.imageshow.GeometryMetadata;
import com.android.gallery3d.filtershow.presets.ImagePreset;

public abstract class ImageFilter implements Cloneable {

    private ImagePreset mImagePreset;

    protected String mName = "Original";
    private final String LOGTAG = "ImageFilter";

    // TODO: Temporary, for dogfood note memory issues with toasts for better
    // feedback. Remove this when filters actually work in low memory
    // situations.
    private static FilterShowActivity sActivity = null;

    public static void setActivityForMemoryToasts(FilterShowActivity activity) {
        sActivity = activity;
    }

    public static void resetStatics() {
        sActivity = null;
    }

    public void freeResources() {}

    public void displayLowMemoryToast() {
        if (sActivity != null) {
            sActivity.runOnUiThread(new Runnable() {
                public void run() {
                    Toast.makeText(sActivity, "Memory too low for filter " + getName() +
                            ", please file a bug report", Toast.LENGTH_SHORT).show();
                }
            });
        }
    }

    public void setName(String name) {
        mName = name;
    }

    public String getName() {
        return mName;
    }

    public Bitmap apply(Bitmap bitmap, float scaleFactor, int quality) {
        // do nothing here, subclasses will implement filtering here
        return bitmap;
    }

    /**
     * Called on small bitmaps to create button icons for each filter. Override
     * this to provide filter-specific button icons.
     */
    public Bitmap iconApply(Bitmap bitmap, float scaleFactor, int quality) {
        return apply(bitmap, scaleFactor, quality);
    }

    public ImagePreset getImagePreset() {
        return mImagePreset;
    }

    public void setImagePreset(ImagePreset imagePreset) {
        mImagePreset = imagePreset;
    }

    public abstract void useRepresentation(FilterRepresentation representation);

    native protected void nativeApplyGradientFilter(Bitmap bitmap, int w, int h,
            int[] redGradient, int[] greenGradient, int[] blueGradient);

    public FilterRepresentation getDefaultRepresentation() {
        return null;
    }

    protected Matrix getOriginalToScreenMatrix(int w, int h) {
        GeometryMetadata geo = getImagePreset().mGeoData;
        Matrix originalToScreen = geo.getOriginalToScreen(true,
                getImagePreset().getImageLoader().getOriginalBounds().width(),
                getImagePreset().getImageLoader().getOriginalBounds().height(),
                w, h);
        return originalToScreen;
    }
}