/*
 * 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.lib.aliocr.widget.crop;

import android.app.ProgressDialog;
import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.media.ExifInterface;
import android.net.Uri;
import android.os.Handler;
import android.os.ParcelFileDescriptor;
import android.provider.MediaStore;
import android.support.annotation.Nullable;
import android.text.TextUtils;

import java.io.Closeable;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/*
 * Modified from original in AOSP.
 */
class CropUtil {

    private static final String SCHEME_FILE = "file";
    private static final String SCHEME_CONTENT = "content";

    public static void closeSilently(@Nullable Closeable c) {
        if (c == null) return;
        try {
            c.close();
        } catch (Throwable t) {
            // Do nothing
        }
    }

    public static int getExifRotation(File imageFile) {
        if (imageFile == null) return 0;
        try {
            ExifInterface exif = new ExifInterface(imageFile.getAbsolutePath());
            // We only recognize a subset of orientation tag values
            switch (exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED)) {
                case ExifInterface.ORIENTATION_ROTATE_90:
                    return 90;
                case ExifInterface.ORIENTATION_ROTATE_180:
                    return 180;
                case ExifInterface.ORIENTATION_ROTATE_270:
                    return 270;
                default:
                    return ExifInterface.ORIENTATION_UNDEFINED;
            }
        } catch (IOException e) {
            Log.e("Error getting Exif data", e);
            return 0;
        }
    }

    public static boolean copyExifRotation(File sourceFile, File destFile) {
        if (sourceFile == null || destFile == null) return false;
        try {
            ExifInterface exifSource = new ExifInterface(sourceFile.getAbsolutePath());
            ExifInterface exifDest = new ExifInterface(destFile.getAbsolutePath());
            exifDest.setAttribute(ExifInterface.TAG_ORIENTATION, exifSource.getAttribute(ExifInterface.TAG_ORIENTATION));
            exifDest.saveAttributes();
            return true;
        } catch (IOException e) {
            Log.e("Error copying Exif data", e);
            return false;
        }
    }

    @Nullable
    public static File getFromMediaUri(Context context, ContentResolver resolver, Uri uri) {
        if (uri == null) return null;

        if (SCHEME_FILE.equals(uri.getScheme())) {
            return new File(uri.getPath());
        } else if (SCHEME_CONTENT.equals(uri.getScheme())) {
            final String[] filePathColumn = { MediaStore.MediaColumns.DATA, MediaStore.MediaColumns.DISPLAY_NAME };
            Cursor cursor = null;
            try {
                cursor = resolver.query(uri, filePathColumn, null, null, null);
                if (cursor != null && cursor.moveToFirst()) {
                    final int columnIndex = (uri.toString().startsWith("content://com.google.android.gallery3d")) ?
                            cursor.getColumnIndex(MediaStore.MediaColumns.DISPLAY_NAME) :
                            cursor.getColumnIndex(MediaStore.MediaColumns.DATA);
                    // Picasa images on API 13+
                    if (columnIndex != -1) {
                        String filePath = cursor.getString(columnIndex);
                        if (!TextUtils.isEmpty(filePath)) {
                            return new File(filePath);
                        }
                    }
                }
            } catch (IllegalArgumentException e) {
                // Google Drive images
                return getFromMediaUriPfd(context, resolver, uri);
            } catch (SecurityException ignored) {
                // Nothing we can do
            } finally {
                if (cursor != null) cursor.close();
            }
        }
        return null;
    }

    private static String getTempFilename(Context context) throws IOException {
        File outputDir = context.getCacheDir();
        File outputFile = File.createTempFile("image", "tmp", outputDir);
        return outputFile.getAbsolutePath();
    }

    @Nullable
    private static File getFromMediaUriPfd(Context context, ContentResolver resolver, Uri uri) {
        if (uri == null) return null;

        FileInputStream input = null;
        FileOutputStream output = null;
        try {
            ParcelFileDescriptor pfd = resolver.openFileDescriptor(uri, "r");
            FileDescriptor fd = pfd != null ? pfd.getFileDescriptor() : null;
            input = new FileInputStream(fd);

            String tempFilename = getTempFilename(context);
            output = new FileOutputStream(tempFilename);

            int read;
            byte[] bytes = new byte[4096];
            while ((read = input.read(bytes)) != -1) {
                output.write(bytes, 0, read);
            }
            return new File(tempFilename);
        } catch (IOException ignored) {
            // Nothing we can do
        } finally {
            closeSilently(input);
            closeSilently(output);
        }
        return null;
    }

    public static void startBackgroundJob(MonitoredActivity activity,
            String title, String message, Runnable job, Handler handler) {
        // Make the progress dialog uncancelable, so that we can guarantee
        // the thread will be done before the activity getting destroyed
        ProgressDialog dialog = ProgressDialog.show(
                activity, title, message, true, false);
        new Thread(new BackgroundJob(activity, job, dialog, handler)).start();
    }

    private static class BackgroundJob extends MonitoredActivity.LifeCycleAdapter implements Runnable {

        private final MonitoredActivity activity;
        private final ProgressDialog dialog;
        private final Runnable job;
        private final Handler handler;
        private final Runnable cleanupRunner = new Runnable() {
            public void run() {
                activity.removeLifeCycleListener(BackgroundJob.this);
                if (dialog.getWindow() != null) dialog.dismiss();
            }
        };

        public BackgroundJob(MonitoredActivity activity, Runnable job,
                             ProgressDialog dialog, Handler handler) {
            this.activity = activity;
            this.dialog = dialog;
            this.job = job;
            this.activity.addLifeCycleListener(this);
            this.handler = handler;
        }

        public void run() {
            try {
                job.run();
            } finally {
                handler.post(cleanupRunner);
            }
        }

        @Override
        public void onActivityDestroyed(MonitoredActivity activity) {
            // We get here only when the onDestroyed being called before
            // the cleanupRunner. So, run it now and remove it from the queue
            cleanupRunner.run();
            handler.removeCallbacks(cleanupRunner);
        }

        @Override
        public void onActivityStopped(MonitoredActivity activity) {
            dialog.hide();
        }

        @Override
        public void onActivityStarted(MonitoredActivity activity) {
            dialog.show();
        }
    }

}
