/*
 * 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.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import android.widget.VideoView;

import com.android.gallery3d.R;


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;

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

        ActionBar actionBar = getActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);

        Intent intent = getIntent();
        mUri = intent.getData();

        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 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();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.trim, menu);
        return true;
    };

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == android.R.id.home) {
            finish();
            return true;
        } else if (id == R.id.action_trim_video) {
            // TODO: Add the new MediaMuxer API to support the trimming.
            Toast.makeText(getApplicationContext(),
                    "Trimming will be implemented soon!", Toast.LENGTH_SHORT).show();
            return true;
        }
        return false;
    }

    @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;
    }
}