import java.util.Timer;
import java.util.TimerTask;

import android.content.Context;
import android.media.MediaPlayer;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.widget.TextView;

import com.uperone.typetextview.R;

/**
 * 模拟打字机效果
 * 
 * */
public class TypeTextView extends TextView {
	private Context mContext = null;
	private MediaPlayer mMediaPlayer = null;
	private String mShowTextString = null;
	private Timer mTypeTimer = null;
	private OnTypeViewListener mOnTypeViewListener = null;
	private static final int TYPE_TIME_DELAY = 80;
	private int mTypeTimeDelay = TYPE_TIME_DELAY; // 打字间隔
	
	public TypeTextView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		initTypeTextView( context );
	}

	public TypeTextView(Context context, AttributeSet attrs) {
		super(context, attrs);
		initTypeTextView( context );
	}

	public TypeTextView(Context context) {
		super(context);
		initTypeTextView( context );
	}
	
	public void setOnTypeViewListener( OnTypeViewListener onTypeViewListener ){
		mOnTypeViewListener = onTypeViewListener;
	}
	
	public void start( final String textString ){
		start( textString, TYPE_TIME_DELAY );
	}
	
	public void start( final String textString, final int typeTimeDelay ){
		if( TextUtils.isEmpty( textString ) || typeTimeDelay < 0 ){
			return;
		}
		post( new Runnable( ) {
			@Override
			public void run() {
				mShowTextString = textString;
				mTypeTimeDelay = typeTimeDelay;
				setText( "" );
				startTypeTimer( );
				if( null != mOnTypeViewListener ){
					mOnTypeViewListener.onTypeStart( );
				}
			}
		});
	}
	
	public void stop( ){
		stopTypeTimer( );
		stopAudio();
	}
	
	private void initTypeTextView( Context context ){
		mContext = context;
	}
	
	private void startTypeTimer( ){
		stopTypeTimer( );
		mTypeTimer = new Timer( );
		mTypeTimer.schedule( new TypeTimerTask(), mTypeTimeDelay );
	}
	
	private void stopTypeTimer( ){
		if( null != mTypeTimer ){
			mTypeTimer.cancel( );
			mTypeTimer = null;
		}
	}
	
	private void startAudioPlayer() {
		stopAudio();
		playAudio( R.raw.type_in );
	}
	
	private void playAudio( int audioResId ){
		try{
			stopAudio( );
            mMediaPlayer = MediaPlayer.create( mContext, audioResId );
            mMediaPlayer.start( );
        }catch( Exception e ){
            e.printStackTrace();
        }
	}
	
	private void stopAudio( ){
		if( mMediaPlayer != null && mMediaPlayer.isPlaying( ) ){
            mMediaPlayer.stop( );
            mMediaPlayer.release( );
            mMediaPlayer = null;
        }
	}
	
	class TypeTimerTask extends TimerTask{
		@Override
		public void run() {
			post(new Runnable( ) {
				@Override
				public void run() {
					if( getText( ).toString( ).length( ) < mShowTextString.length( ) ){
						setText( mShowTextString.substring(0, getText( ).toString( ).length( ) + 1 ) );
						startAudioPlayer();
						startTypeTimer( );
					}else{
						stopTypeTimer( );
						if( null != mOnTypeViewListener ){
							mOnTypeViewListener.onTypeOver( );
						}
					}
				}
			});
		}
	}
	
	public interface OnTypeViewListener{
		public void onTypeStart( );
		public void onTypeOver( );
	}
}