/*
 * Copyright (C) 2008 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 android.renderscript;

import android.content.Context;
import android.content.res.Resources;
import android.util.Log;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map.Entry;
import java.util.HashMap;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

/**
 * The superclass for all user-defined scripts. This is only
 * intended to be used by the generated derived classes.
 **/
public class ScriptC extends Script {
    private static final String TAG = "ScriptC";

    /**
     * Only intended for use by the generated derived classes.
     *
     * @param id
     * @param rs
     */
    protected ScriptC(int id, RenderScript rs) {
        super(id, rs);
    }

    /**
     * Only intended for use by the generated derived classes.
     *
     *
     * @param rs
     * @param resources
     * @param resourceID
     */
    protected ScriptC(RenderScript rs, Resources resources, int resourceID) {
        super(0, rs);
        int id = internalCreate(rs, resources, resourceID);
        if (id == 0) {
            throw new RSRuntimeException("Loading of ScriptC script failed.");
        }
        setID(id);
    }

    /**
     * Name of the file that holds the object cache.
     */
    private static final String CACHE_PATH = "com.android.renderscript.cache";

    static String mCachePath;

    private static synchronized int internalCreate(RenderScript rs, Resources resources, int resourceID) {
        byte[] pgm;
        int pgmLength;
        InputStream is = resources.openRawResource(resourceID);
        try {
            try {
                pgm = new byte[1024];
                pgmLength = 0;
                while(true) {
                    int bytesLeft = pgm.length - pgmLength;
                    if (bytesLeft == 0) {
                        byte[] buf2 = new byte[pgm.length * 2];
                        System.arraycopy(pgm, 0, buf2, 0, pgm.length);
                        pgm = buf2;
                        bytesLeft = pgm.length - pgmLength;
                    }
                    int bytesRead = is.read(pgm, pgmLength, bytesLeft);
                    if (bytesRead <= 0) {
                        break;
                    }
                    pgmLength += bytesRead;
                }
            } finally {
                is.close();
            }
        } catch(IOException e) {
            throw new Resources.NotFoundException();
        }

        String resName = resources.getResourceEntryName(resourceID);

        // Create the RS cache path if we haven't done so already.
        if (mCachePath == null) {
            File f = new File(rs.mCacheDir, CACHE_PATH);
            mCachePath = f.getAbsolutePath();
            f.mkdirs();
        }
        //        Log.v(TAG, "Create script for resource = " + resName);
        return rs.nScriptCCreate(resName, mCachePath, pgm, pgmLength);
    }
}
