package de.podfetcher.activity;

import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.media.MediaPlayer;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

import com.actionbarsherlock.app.SherlockActivity;
import com.actionbarsherlock.view.Menu;

import de.podfetcher.R;
import de.podfetcher.feed.FeedMedia;
import de.podfetcher.service.PlaybackService;
import de.podfetcher.service.PlayerStatus;
import de.podfetcher.util.Converter;

public class MediaplayerActivity extends SherlockActivity {
	private final String TAG = "MediaplayerActivity";
	
	private static final int DEFAULT_SEEK_DELTA = 30000;	// Seek-Delta to use when using FF or Rev Buttons
	
	private PlaybackService playbackService;
	private MediaPositionObserver positionObserver;
	
	private FeedMedia media;
	private PlayerStatus status;
	
	
	// Widgets
	private ImageView imgvCover;
	private TextView txtvStatus;
	private TextView txtvPosition;
	private TextView txtvLength;
	private SeekBar sbPosition;
	private ImageButton butPlay;
	private ImageButton butRev;
	private ImageButton butFF;
	
	@Override
	protected void onStop() {
		super.onStop();
		Log.d(TAG, "Activity stopped");
		unregisterReceiver(statusUpdate);
		unbindService(mConnection);
		if (positionObserver != null) {
			positionObserver.cancel(true);
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// TODO Auto-generated method stub
		return super.onCreateOptionsMenu(menu);
	}
	
	

	@Override
	protected void onResume() {
		super.onResume();
		Log.d(TAG, "Resuming Activity");
		bindToService();
		registerReceiver(statusUpdate, new IntentFilter(PlaybackService.ACTION_PLAYER_STATUS_CHANGED));
	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		Log.d(TAG, "Creating Activity");
		this.setContentView(R.layout.mediaplayer_activity);
		
		setupGUI();
		bindToService();
		registerReceiver(statusUpdate, new IntentFilter(PlaybackService.ACTION_PLAYER_STATUS_CHANGED));
	}
	
	private void bindToService() {
		if(!bindService(new Intent(this, PlaybackService.class), mConnection, 0)) {
			status = PlayerStatus.STOPPED;
			handleStatus();
		}
	}
	
	private void handleStatus() {
		switch (status) {
			
		case ERROR:
			setStatusMsg(R.string.player_error_msg, View.VISIBLE);
			handleError();
			break;
		case PAUSED:
			setStatusMsg(R.string.player_paused_msg, View.VISIBLE);
			loadMediaInfo();
			if (positionObserver != null) {
				positionObserver.cancel(true);
				positionObserver = null;
			}
			butPlay.setImageResource(android.R.drawable.ic_media_play);
			break;
		case PLAYING:
			setStatusMsg(0, View.INVISIBLE);
			loadMediaInfo();
			setupPositionObserver();
			butPlay.setImageResource(android.R.drawable.ic_media_pause);
			break;
		case PREPARING:
			setStatusMsg(R.string.player_preparing_msg, View.VISIBLE);
			break;
		}
	}
	
	private void setStatusMsg(int resId, int visibility) {
		if(visibility == View.VISIBLE) {
			txtvStatus.setText(resId);
		}
		txtvStatus.setVisibility(visibility);
	}
	
	private void setupPositionObserver() {
		if (positionObserver == null) {
			positionObserver = new MediaPositionObserver() {

				@Override
				protected void onProgressUpdate(Integer... values) {
					super.onProgressUpdate(values);
					txtvPosition.setText(
							Converter.getDurationStringLong(values[0]));
					
					float progress = ((float) values[0]) / getDuration();
					sbPosition.setProgress((int) (progress * 100));
				}
				
			};
			positionObserver.execute(playbackService.getPlayer());
		}
	}
	
	private void loadMediaInfo() {
		if (media != null) {
			MediaPlayer player = playbackService.getPlayer();
			
			getSupportActionBar().setSubtitle(media.getItem().getTitle());
			getSupportActionBar().setTitle(
					media.getItem().getFeed().getTitle());
			
			imgvCover.setImageBitmap(
					media.getItem().getFeed().getImage().getImageBitmap());
			
			txtvPosition.setText(Converter.getDurationStringLong((player.getCurrentPosition())));
			txtvLength.setText(Converter.getDurationStringLong(player.getDuration()));
		}
	}
	
	private void setupGUI() {
		imgvCover = (ImageView) findViewById(R.id.imgvCover);
		txtvPosition = (TextView) findViewById(R.id.txtvPosition);
		txtvLength = (TextView) findViewById(R.id.txtvLength);
		txtvStatus = (TextView) findViewById(R.id.txtvStatus);
		sbPosition = (SeekBar) findViewById(R.id.sbPosition);
		butPlay = (ImageButton) findViewById(R.id.butPlay);
		butRev = (ImageButton) findViewById(R.id.butRev);
		butFF = (ImageButton) findViewById(R.id.butFF);
		
		sbPosition.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
			int duration;
			float prog;
			
			@Override
			public void onProgressChanged(SeekBar seekBar, int progress,
					boolean fromUser) {
				if (fromUser) {
					prog = progress / 100.0f;
					duration = playbackService.getPlayer().getDuration();
					txtvPosition.setText(Converter.getDurationStringLong((int) (prog * duration)));
				}
				
			}
			
			@Override
			public void onStartTrackingTouch(SeekBar seekBar) {
				// interrupt position Observer, restart later
				if (positionObserver != null) {
					positionObserver.cancel(true);
					positionObserver = null;
				}
			}
			
			@Override
			public void onStopTrackingTouch(SeekBar seekBar) {
				playbackService.seek((int) (prog * duration));
				setupPositionObserver();
			}
		});
		
		butPlay.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				if (status == PlayerStatus.PLAYING) {
					playbackService.pause();
				} else if (status == PlayerStatus.PAUSED) {
					playbackService.play();
				}
			}	
		});
		
		butFF.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				if (status == PlayerStatus.PLAYING) {
					playbackService.seekDelta(DEFAULT_SEEK_DELTA);
				}
			}
		});
		
		butRev.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				if (status == PlayerStatus.PLAYING) {
					playbackService.seekDelta(-DEFAULT_SEEK_DELTA);
				}
			}
		});
	}
	
	
	private void handleError() {
		// TODO implement
	}
	
	private ServiceConnection mConnection = new ServiceConnection() {
		public void onServiceConnected(ComponentName className, IBinder service) {
			playbackService = ((PlaybackService.LocalBinder)service).getService();
			status = playbackService.getStatus();
			media = playbackService.getMedia();
			handleStatus();
			Log.d(TAG, "Connection to Service established");
		}

		@Override
		public void onServiceDisconnected(ComponentName name) {
			playbackService = null;
			Log.d(TAG, "Disconnected from Service");
			
		}
	};
	
	private BroadcastReceiver statusUpdate = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
            Log.d(TAG, "Received statusUpdate Intent.");
			status = playbackService.getStatus();
			handleStatus();
		}
	};
	
	/** Refreshes the current position of the media file that is playing. */
	public class MediaPositionObserver extends AsyncTask<MediaPlayer, Integer, Boolean> {
		
		private static final int WAITING_INTERVALL = 1000;
		private MediaPlayer player;
		private int duration;
		
		@Override
		protected void onCancelled(Boolean result) {
			Log.d(TAG, "Task was cancelled");
		}
		
		@Override
		protected Boolean doInBackground(MediaPlayer... p) {
			Log.d(TAG, "Background Task started");
			player = p[0];
			duration = player.getDuration();
			
			while(player.isPlaying() && !isCancelled()) {
				try {
					Thread.sleep(WAITING_INTERVALL);
				} catch(InterruptedException e) {
					Log.d(TAG, "Thread was interrupted while waiting. Finishing now");
					return false;
				}
				publishProgress(player.getCurrentPosition());
			}
			Log.d(TAG, "Background Task finished");
			return true;
		}
		
		public int getDuration() {
			return duration;
		}
	}
	
	
	
}