/*
 * Copyright 2012 The Stanford MobiSocial Laboratory
 *
 * 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 mobisocial.musubi.ui;

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore.Images;
import android.provider.MediaStore.Images.ImageColumns;

/**
 * Shares the latest image from a given bucket from the Android gallery,
 * defaulting to the Camera.
 */
public class LatestPictureActivity extends Activity {
    public static final String EXTRA_BUCKET = "bucket";

    public static final String BUCKET_CAMERA = "Camera";
    public static final String BUCKET_SCREENSHOTS = "Screenshots";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Intent result = new Intent();
        String bucket;
        if (getIntent().hasExtra(EXTRA_BUCKET)) {
            bucket = getIntent().getStringExtra(EXTRA_BUCKET);
        } else {
            bucket = BUCKET_CAMERA;
        }
        result.setData(getLastPhoto(bucket));
        setResult(RESULT_OK, result);
        finish();
    }

    private Uri getLastPhoto(String bucket) {
        String selection = ImageColumns.BUCKET_DISPLAY_NAME + " = ?";
        String[] selectionArgs = new String[] { bucket };
        String sort = ImageColumns.DATE_TAKEN + " desc";
        Cursor c =
            android.provider.MediaStore.Images.Media.query(getContentResolver(),
                    Images.Media.EXTERNAL_CONTENT_URI, 
                    new String[] { ImageColumns._ID }, selection, selectionArgs, sort );

        int idx = c.getColumnIndex(ImageColumns._ID);
        if (c.moveToFirst()) {
            return Uri.withAppendedPath(Images.Media.EXTERNAL_CONTENT_URI, c.getString(idx));
        }
        return null;
    }
}