/*
 * 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.app;

import android.app.ActionBar;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.provider.MediaStore;
import android.provider.MediaStore.Video;
import android.provider.MediaStore.Video.VideoColumns;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.VideoView;

import com.android.gallery3d.R;
import com.android.gallery3d.util.BucketNames;

import java.io.File;
import java.io.IOException;
import java.sql.Date;
import java.text.SimpleDateFormat;

public class TrimVideo extends Activity implements
        MediaPlayer.OnErrorListener,
        MediaPlayer.OnCompletionListener,
        ControllerOverlay.Listener {

    private VideoView mVideoView;
    private TrimControllerOverlay mController;
    private Context mContext;
    private Uri mUri;
    private final Handler mHandler = new Handler();
    public static final String TRIM_ACTION = "com.android.camera.action.TRIM";

    public ProgressDialog mProgress;

    private int mTrimStartTime = 0;
    private int mTrimEndTime = 0;
    private int mVideoPosition = 0;
    public static final String KEY_TRIM_START = "trim_start";
    public static final String KEY_TRIM_END = "trim_end";
    public static final String KEY_VIDEO_POSITION = "video_pos";
    private boolean mHasPaused = false;

    private String mSrcVideoPath = null;
    private String mSaveFileName = null;
    private static final String TIME_STAMP_NAME = "'TRIM'_yyyyMMdd_HHmmss";
    private File mSrcFile = null;
    private File mDstFile = null;
    private File mSaveDirectory = null;
    // For showing the result.
    private String saveFolderName = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        mContext = getApplicationContext();
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_ACTION_BAR);
        requestWindowFeature(Window.FEATURE_ACTION_BAR_OVERLAY);

        ActionBar actionBar = getActionBar();
        int displayOptions = ActionBar.DISPLAY_SHOW_HOME;
        actionBar.setDisplayOptions(0, displayOptions);
        displayOptions = ActionBar.DISPLAY_SHOW_CUSTOM;
        actionBar.setDisplayOptions(displayOptions, displayOptions);
        actionBar.setCustomView(R.layout.trim_menu);

        TextView mSaveVideoTextView = (TextView) findViewById(R.id.start_trim);
        mSaveVideoTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                trimVideo();
            }
        });

        Intent intent = getIntent();
        mUri = intent.getData();
        mSrcVideoPath = intent.getStringExtra(PhotoPage.KEY_MEDIA_ITEM_PATH);
        setContentView(R.layout.trim_view);
        View rootView = findViewById(R.id.trim_view_root);

        mVideoView = (VideoView) rootView.findViewById(R.id.surface_view);

        mController = new TrimControllerOverlay(mContext);
        ((ViewGroup) rootView).addView(mController.getView());
        mController.setListener(this);
        mController.setCanReplay(true);

        mVideoView.setOnErrorListener(this);
        mVideoView.setOnCompletionListener(this);
        mVideoView.setVideoURI(mUri);

        playVideo();
    }

    @Override
    public void onResume() {
        super.onResume();
        if (mHasPaused) {
            mVideoView.seekTo(mVideoPosition);
            mVideoView.resume();
            mHasPaused = false;
        }
        mHandler.post(mProgressChecker);
    }

    @Override
    public void onPause() {
        mHasPaused = true;
        mHandler.removeCallbacksAndMessages(null);
        mVideoPosition = mVideoView.getCurrentPosition();
        mVideoView.suspend();
        super.onPause();
    }

    @Override
    public void onStop() {
        if (mProgress != null) {
            mProgress.dismiss();
            mProgress = null;
        }
        super.onStop();
    }

    @Override
    public void onDestroy() {
        mVideoView.stopPlayback();
        super.onDestroy();
    }

    private final Runnable mProgressChecker = new Runnable() {
        @Override
        public void run() {
            int pos = setProgress();
            mHandler.postDelayed(mProgressChecker, 200 - (pos % 200));
        }
    };

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        savedInstanceState.putInt(KEY_TRIM_START, mTrimStartTime);
        savedInstanceState.putInt(KEY_TRIM_END, mTrimEndTime);
        savedInstanceState.putInt(KEY_VIDEO_POSITION, mVideoPosition);
        super.onSaveInstanceState(savedInstanceState);
    }

    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        mTrimStartTime = savedInstanceState.getInt(KEY_TRIM_START, 0);
        mTrimEndTime = savedInstanceState.getInt(KEY_TRIM_END, 0);
        mVideoPosition = savedInstanceState.getInt(KEY_VIDEO_POSITION, 0);
    }

    // This updates the time bar display (if necessary). It is called by
    // mProgressChecker and also from places where the time bar needs
    // to be updated immediately.
    private int setProgress() {
        mVideoPosition = mVideoView.getCurrentPosition();
        // If the video position is smaller than the starting point of trimming,
        // correct it.
        if (mVideoPosition < mTrimStartTime) {
            mVideoView.seekTo(mTrimStartTime);
            mVideoPosition = mTrimStartTime;
        }
        // If the position is bigger than the end point of trimming, show the
        // replay button and pause.
        if (mVideoPosition >= mTrimEndTime && mTrimEndTime > 0) {
            if (mVideoPosition > mTrimEndTime) {
                mVideoView.seekTo(mTrimEndTime);
                mVideoPosition = mTrimEndTime;
            }
            mController.showEnded();
            mVideoView.pause();
        }

        int duration = mVideoView.getDuration();
        if (duration > 0 && mTrimEndTime == 0) {
            mTrimEndTime = duration;
        }
        mController.setTimes(mVideoPosition, duration, mTrimStartTime, mTrimEndTime);
        return mVideoPosition;
    }

    private void playVideo() {
        mVideoView.start();
        mController.showPlaying();
        setProgress();
    }

    private void pauseVideo() {
        mVideoView.pause();
        mController.showPaused();
    }

    // Copy from SaveCopyTask.java in terms of how to handle the destination
    // path and filename : querySource() and getSaveDirectory().
    private interface ContentResolverQueryCallback {
        void onCursorResult(Cursor cursor);
    }

    private void querySource(String[] projection, ContentResolverQueryCallback callback) {
        ContentResolver contentResolver = getContentResolver();
        Cursor cursor = null;
        try {
            cursor = contentResolver.query(mUri, projection, null, null, null);
            if ((cursor != null) && cursor.moveToNext()) {
                callback.onCursorResult(cursor);
            }
        } catch (Exception e) {
            // Ignore error for lacking the data column from the source.
        } finally {
            if (cursor != null) {
                cursor.close();
            }
        }
    }

    private File getSaveDirectory() {
        final File[] dir = new File[1];
        querySource(new String[] {
                VideoColumns.DATA }, new ContentResolverQueryCallback() {

            @Override
            public void onCursorResult(Cursor cursor) {
                dir[0] = new File(cursor.getString(0)).getParentFile();
            }
        });
        return dir[0];
    }

    private void trimVideo() {
        int delta = mTrimEndTime - mTrimStartTime;
        // Considering that we only trim at sync frame, we don't want to trim
        // when the time interval is too short or too close to the origin.
        if (delta < 100 ) {
            Toast.makeText(getApplicationContext(),
                getString(R.string.trim_too_short),
                Toast.LENGTH_SHORT).show();
            return;
        }
        if (Math.abs(mVideoView.getDuration() - delta) < 100) {
            // If no change has been made, go back
            onBackPressed();
            return;
        }
        // Use the default save directory if the source directory cannot be
        // saved.
        mSaveDirectory = getSaveDirectory();
        if ((mSaveDirectory == null) || !mSaveDirectory.canWrite()) {
            mSaveDirectory = new File(Environment.getExternalStorageDirectory(),
                    BucketNames.DOWNLOAD);
            saveFolderName = getString(R.string.folder_download);
        } else {
            saveFolderName = mSaveDirectory.getName();
        }
        mSaveFileName = new SimpleDateFormat(TIME_STAMP_NAME).format(
                new Date(System.currentTimeMillis()));

        mDstFile = new File(mSaveDirectory, mSaveFileName + ".mp4");
        mSrcFile = new File(mSrcVideoPath);

        showProgressDialog();

        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    TrimVideoUtils.startTrim(mSrcFile, mDstFile, mTrimStartTime, mTrimEndTime);
                    // Update the database for adding a new video file.
                    insertContent(mDstFile);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                // After trimming is done, trigger the UI changed.
                mHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getApplicationContext(),
                            getString(R.string.save_into) + " " + saveFolderName,
                            Toast.LENGTH_SHORT)
                            .show();
                        // TODO: change trimming into a service to avoid
                        // this progressDialog and add notification properly.
                        if (mProgress != null) {
                            mProgress.dismiss();
                            mProgress = null;
                            // Show the result only when the activity not stopped.
                            Intent intent = new Intent(android.content.Intent.ACTION_VIEW);
                            intent.setDataAndTypeAndNormalize(Uri.fromFile(mDstFile), "video/*");
                            intent.putExtra(MediaStore.EXTRA_FINISH_ON_COMPLETION, false);
                            startActivity(intent);
                            finish();
                        }
                    }
                });
            }
        }).start();
    }

    private void showProgressDialog() {
        // create a background thread to trim the video.
        // and show the progress.
        mProgress = new ProgressDialog(this);
        mProgress.setTitle(getString(R.string.trimming));
        mProgress.setMessage(getString(R.string.please_wait));
        // TODO: make this cancelable.
        mProgress.setCancelable(false);
        mProgress.setCanceledOnTouchOutside(false);
        mProgress.show();
    }

    /**
     * Insert the content (saved file) with proper video properties.
     */
    private Uri insertContent(File file) {
        long nowInMs = System.currentTimeMillis();
        long nowInSec = nowInMs / 1000;
        final ContentValues values = new ContentValues(12);
        values.put(Video.Media.TITLE, mSaveFileName);
        values.put(Video.Media.DISPLAY_NAME, file.getName());
        values.put(Video.Media.MIME_TYPE, "video/mp4");
        values.put(Video.Media.DATE_TAKEN, nowInMs);
        values.put(Video.Media.DATE_MODIFIED, nowInSec);
        values.put(Video.Media.DATE_ADDED, nowInSec);
        values.put(Video.Media.DATA, file.getAbsolutePath());
        values.put(Video.Media.SIZE, file.length());
        // Copy the data taken and location info from src.
        String[] projection = new String[] {
                VideoColumns.DATE_TAKEN,
                VideoColumns.LATITUDE,
                VideoColumns.LONGITUDE,
                VideoColumns.RESOLUTION,
        };

        // Copy some info from the source file.
        querySource(projection, new ContentResolverQueryCallback() {
            @Override
            public void onCursorResult(Cursor cursor) {
                long timeTaken = cursor.getLong(0);
                if (timeTaken > 0) {
                    values.put(Video.Media.DATE_TAKEN, timeTaken);
                }
                double latitude = cursor.getDouble(1);
                double longitude = cursor.getDouble(2);
                // TODO: Change || to && after the default location issue is
                // fixed.
                if ((latitude != 0f) || (longitude != 0f)) {
                    values.put(Video.Media.LATITUDE, latitude);
                    values.put(Video.Media.LONGITUDE, longitude);
                }
                values.put(Video.Media.RESOLUTION, cursor.getString(3));

            }
        });

        return getContentResolver().insert(Video.Media.EXTERNAL_CONTENT_URI, values);
    }

    @Override
    public void onPlayPause() {
        if (mVideoView.isPlaying()) {
            pauseVideo();
        } else {
            playVideo();
        }
    }

    @Override
    public void onSeekStart() {
        pauseVideo();
    }

    @Override
    public void onSeekMove(int time) {
        mVideoView.seekTo(time);
    }

    @Override
    public void onSeekEnd(int time, int start, int end) {
        mVideoView.seekTo(time);
        mTrimStartTime = start;
        mTrimEndTime = end;
        setProgress();
    }

    @Override
    public void onShown() {
    }

    @Override
    public void onHidden() {
    }

    @Override
    public void onReplay() {
        mVideoView.seekTo(mTrimStartTime);
        playVideo();
    }

    @Override
    public void onCompletion(MediaPlayer mp) {
        mController.showEnded();
    }

    @Override
    public boolean onError(MediaPlayer mp, int what, int extra) {
        return false;
    }
}