package org.hedgewars.hedgeroid.netplay;

import org.hedgewars.hedgeroid.R;
import org.hedgewars.hedgeroid.netplay.Netplay.State;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.content.LocalBroadcastManager;
import android.widget.Toast;

/**
 * Fragment for use by an activity that depends on the state of the network
 * connection. The activity must implement the NetplayStateListener interface.
 * 
 * This fragment manages a few aspects of the netplay connection: Requesting
 * the network system loop to run at high frequency while the activity is in
 * the foreground, and reacting to changes in the networking state by calling
 * a callback method on the activity.
 */
public class NetplayStateFragment extends Fragment {
    private Netplay netplay;
    private Context appContext;
    private LocalBroadcastManager broadcastManager;
    private NetplayStateListener listener;
    private State knownState;
    
    interface NetplayStateListener {
    	/**
    	 * This is called while the activity is running, and every time during resume, if
    	 * a change in the networking state is detected. It is also called once
    	 * with the initial state (which could be called a change from the "unknown" state).
    	 */
    	void onNetplayStateChanged(State newState);
    }
    
    @Override
	public void onAttach(Activity activity) {
		super.onAttach(activity);
		try {
			listener = (NetplayStateListener) activity;
		} catch(ClassCastException e) {
			throw new ClassCastException("Activity " + activity + " must implement NetplayStateListener to use NetplayStateFragment.");
		}
	}
	
	@Override
	public void onDetach() {
		super.onDetach();
		listener = null;
	}
	
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        appContext = getActivity().getApplicationContext();
        broadcastManager = LocalBroadcastManager.getInstance(appContext);
        netplay = Netplay.getAppInstance(appContext);
    }    

    @Override
    public void onResume() {
    	super.onResume();
    	broadcastManager.registerReceiver(disconnectReceiver, new IntentFilter(Netplay.ACTION_DISCONNECTED));
    	broadcastManager.registerReceiver(leaveRoomReceiver, new IntentFilter(Netplay.ACTION_LEFT_ROOM));
    	broadcastManager.registerReceiver(stateChangeReceiver, new IntentFilter(Netplay.ACTION_STATE_CHANGED));
    	netplay.requestFastTicks();
    	
    	State newState = netplay.getState();
		if(knownState != newState) {
    		listener.onNetplayStateChanged(newState);
    		knownState = newState;
    	}
    }
    
    @Override
    public void onPause() {
    	super.onPause();
    	broadcastManager.unregisterReceiver(disconnectReceiver);
    	broadcastManager.unregisterReceiver(leaveRoomReceiver);
    	broadcastManager.unregisterReceiver(stateChangeReceiver);
    	netplay.unrequestFastTicks();
    }

	private final BroadcastReceiver disconnectReceiver = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
			if(intent.getBooleanExtra(Netplay.EXTRA_HAS_ERROR, true)) {
				String message = intent.getStringExtra(Netplay.EXTRA_MESSAGE);
				String toastText = getString(R.string.toast_disconnected, message);
				Toast.makeText(appContext, toastText, Toast.LENGTH_LONG).show();
			}
		}
	};
	
	private final BroadcastReceiver leaveRoomReceiver = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
			int reason = intent.getIntExtra(Netplay.EXTRA_REASON, -1);
			if(reason == JnaFrontlib.NETCONN_ROOMLEAVE_ABANDONED) {
				Toast.makeText(appContext, R.string.toast_room_abandoned, Toast.LENGTH_LONG).show();
			} else if(reason == JnaFrontlib.NETCONN_ROOMLEAVE_KICKED) {
				Toast.makeText(appContext, R.string.toast_kicked, Toast.LENGTH_LONG).show();
			}
		}
	};
	
	private final BroadcastReceiver stateChangeReceiver = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
			State newState = netplay.getState();
			listener.onNetplayStateChanged(newState);
			knownState = newState;
		}
	};
}