/* $Id: MyApp.java 5361 2016-06-28 14:32:08Z nanang $ */
/*
 * Copyright (C) 2013 Teluu Inc. (http://www.teluu.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package org.pjsip.pjsua2.app;

import java.io.File;
import java.util.ArrayList;

import org.pjsip.pjsua2.*;


/* Interface to separate UI & engine a bit better */
interface MyAppObserver
{
    abstract void notifyRegState(int code, String reason, long expiration);
    abstract void notifyIncomingCall(MyCall call);
    abstract void notifyCallState(MyCall call);
    abstract void notifyCallMediaState(MyCall call);
    abstract void notifyBuddyState(MyBuddy buddy);
    abstract void notifyChangeNetwork();
}


class MyLogWriter extends LogWriter
{
    @Override
    public void write(LogEntry entry)
    {
	System.out.println(entry.getMsg());
    }
}


class MyCall extends Call
{
    public VideoWindow vidWin;
    public VideoPreview vidPrev;

    MyCall(MyAccount acc, int call_id)
    {
	super(acc, call_id);
	vidWin = null;
    }

    @Override
    public void onCallState(OnCallStateParam prm)
    {
	try {
	    CallInfo ci = getInfo();
	    if (ci.getState() == 
		pjsip_inv_state.PJSIP_INV_STATE_DISCONNECTED)
	    {
		MyApp.ep.utilLogWrite(3, "MyCall", this.dump(true, ""));
	    }
	} catch (Exception e) {
	}
	
	// Should not delete this call instance (self) in this context,
	// so the observer should manage this call instance deletion
	// out of this callback context.
	MyApp.observer.notifyCallState(this);
    }

    @Override
    public void onCallMediaState(OnCallMediaStateParam prm)
    {
	CallInfo ci;
	try {
	    ci = getInfo();
	} catch (Exception e) {
	    return;
	}

	CallMediaInfoVector cmiv = ci.getMedia();

	for (int i = 0; i < cmiv.size(); i++) {
	    CallMediaInfo cmi = cmiv.get(i);
	    if (cmi.getType() == pjmedia_type.PJMEDIA_TYPE_AUDIO &&
		(cmi.getStatus() == 
		 	pjsua_call_media_status.PJSUA_CALL_MEDIA_ACTIVE ||
		 cmi.getStatus() == 
			pjsua_call_media_status.PJSUA_CALL_MEDIA_REMOTE_HOLD))
	    {
		// connect ports
		try {
		    AudioMedia am = getAudioMedia(i);
		    MyApp.ep.audDevManager().getCaptureDevMedia().
							    startTransmit(am);
		    am.startTransmit(MyApp.ep.audDevManager().
				     getPlaybackDevMedia());
		} catch (Exception e) {
		    System.out.println("Failed connecting media ports" +
				       e.getMessage());
		    continue;
		}
	    } else if (cmi.getType() == pjmedia_type.PJMEDIA_TYPE_VIDEO &&
		       cmi.getStatus() == 
			    pjsua_call_media_status.PJSUA_CALL_MEDIA_ACTIVE &&
		       cmi.getVideoIncomingWindowId() != pjsua2.INVALID_ID)
	    {
		vidWin = new VideoWindow(cmi.getVideoIncomingWindowId());
		vidPrev = new VideoPreview(cmi.getVideoCapDev());
	    }
	}

	MyApp.observer.notifyCallMediaState(this);
    }
}


class MyAccount extends Account
{
    public ArrayList<MyBuddy> buddyList = new ArrayList<MyBuddy>();
    public AccountConfig cfg;

    MyAccount(AccountConfig config)
    {
	super();
	cfg = config;
    }

    public MyBuddy addBuddy(BuddyConfig bud_cfg)
    {
	/* Create Buddy */
	MyBuddy bud = new MyBuddy(bud_cfg);
	try {
	    bud.create(this, bud_cfg);
	} catch (Exception e) {
	    bud.delete();
	    bud = null;
	}

	if (bud != null) {
	    buddyList.add(bud);
	    if (bud_cfg.getSubscribe())
		try {
		    bud.subscribePresence(true);
	    } catch (Exception e) {}
	}

	return bud;
    }

    public void delBuddy(MyBuddy buddy)
    {
	buddyList.remove(buddy);
	buddy.delete();
    }

    public void delBuddy(int index)
    {
	MyBuddy bud = buddyList.get(index);
	buddyList.remove(index);
	bud.delete();
    }

    @Override
    public void onRegState(OnRegStateParam prm)
    {
        MyApp.observer.notifyRegState(prm.getCode(), prm.getReason(),
				      prm.getExpiration());
    }

    @Override
    public void onIncomingCall(OnIncomingCallParam prm)
    {
	System.out.println("======== Incoming call ======== ");
	MyCall call = new MyCall(this, prm.getCallId());
	MyApp.observer.notifyIncomingCall(call);
    }

    @Override
    public void onInstantMessage(OnInstantMessageParam prm)
    {
	System.out.println("======== Incoming pager ======== ");
	System.out.println("From     : " + prm.getFromUri());
	System.out.println("To       : " + prm.getToUri());
	System.out.println("Contact  : " + prm.getContactUri());
	System.out.println("Mimetype : " + prm.getContentType());
	System.out.println("Body     : " + prm.getMsgBody());
    }
}


class MyBuddy extends Buddy
{
    public BuddyConfig cfg;

    MyBuddy(BuddyConfig config)
    {
	super();
	cfg = config;
    }

    String getStatusText()
    {
	BuddyInfo bi;

	try {
	    bi = getInfo();
	} catch (Exception e) {
	    return "?";
	}

	String status = "";
	if (bi.getSubState() == pjsip_evsub_state.PJSIP_EVSUB_STATE_ACTIVE) {
	    if (bi.getPresStatus().getStatus() ==
		pjsua_buddy_status.PJSUA_BUDDY_STATUS_ONLINE)
	    {
		status = bi.getPresStatus().getStatusText();
		if (status == null || status.length()==0) {
		    status = "Online";
		}
	    } else if (bi.getPresStatus().getStatus() == 
		       pjsua_buddy_status.PJSUA_BUDDY_STATUS_OFFLINE)
	    {
		status = "Offline";
	    } else {
		status = "Unknown";
	    }
	}
	return status;
    }

    @Override
    public void onBuddyState()
    {
	MyApp.observer.notifyBuddyState(this);
    }

}


class MyAccountConfig
{
    public AccountConfig accCfg = new AccountConfig();
    public ArrayList<BuddyConfig> buddyCfgs = new ArrayList<BuddyConfig>();

    public void readObject(ContainerNode node)
    {
	try {
	    ContainerNode acc_node = node.readContainer("Account");
	    accCfg.readObject(acc_node);
	    ContainerNode buddies_node = acc_node.readArray("buddies");
	    buddyCfgs.clear();
	    while (buddies_node.hasUnread()) {
		BuddyConfig bud_cfg = new BuddyConfig(); 
		bud_cfg.readObject(buddies_node);
		buddyCfgs.add(bud_cfg);
	    }
	} catch (Exception e) {}
    }

    public void writeObject(ContainerNode node)
    {
	try {
	    ContainerNode acc_node = node.writeNewContainer("Account");
	    accCfg.writeObject(acc_node);
	    ContainerNode buddies_node = acc_node.writeNewArray("buddies");
	    for (int j = 0; j < buddyCfgs.size(); j++) {
		buddyCfgs.get(j).writeObject(buddies_node);
	    }
	} catch (Exception e) {}
    }
}


class MyApp extends pjsua2 {
    public static Endpoint ep = new Endpoint();
    public static MyAppObserver observer;
    public ArrayList<MyAccount> accList = new ArrayList<MyAccount>();

    private ArrayList<MyAccountConfig> accCfgs =
					  new ArrayList<MyAccountConfig>();
    private EpConfig epConfig = new EpConfig();
    private TransportConfig sipTpConfig = new TransportConfig();
    private String appDir;

    /* Maintain reference to log writer to avoid premature cleanup by GC */
    private MyLogWriter logWriter;

    private final String configName = "pjsua2.json";
    private final int SIP_PORT  = 6000;
    private final int LOG_LEVEL = 4;

    public void init(MyAppObserver obs, String app_dir)
    {
	init(obs, app_dir, false);
    }

    public void init(MyAppObserver obs, String app_dir,
		     boolean own_worker_thread)
    {
	observer = obs;
	appDir = app_dir;

	/* Create endpoint */
	try {
	    ep.libCreate();
	} catch (Exception e) {
	    return;
	}


	/* Load config */
	String configPath = appDir + "/" + configName;
	File f = new File(configPath);
	if (f.exists()) {
	    loadConfig(configPath);
	} else {
	    /* Set 'default' values */
	    sipTpConfig.setPort(SIP_PORT);
	}

	/* Override log level setting */
	epConfig.getLogConfig().setLevel(LOG_LEVEL);
	epConfig.getLogConfig().setConsoleLevel(LOG_LEVEL);

	/* Set log config. */
	LogConfig log_cfg = epConfig.getLogConfig();
	logWriter = new MyLogWriter();
	log_cfg.setWriter(logWriter);
	log_cfg.setDecor(log_cfg.getDecor() & 
			 ~(pj_log_decoration.PJ_LOG_HAS_CR | 
			 pj_log_decoration.PJ_LOG_HAS_NEWLINE));

	/* Write log to file (just uncomment whenever needed) */
	//String log_path = android.os.Environment.getExternalStorageDirectory().toString();
	//log_cfg.setFilename(log_path + "/pjsip.log");

	/* Set ua config. */
	UaConfig ua_cfg = epConfig.getUaConfig();
	ua_cfg.setUserAgent("Pjsua2 Android " + ep.libVersion().getFull());

	/* STUN server. */
	//StringVector stun_servers = new StringVector();
	//stun_servers.add("stun.pjsip.org");
	//ua_cfg.setStunServer(stun_servers);

	/* No worker thread */
	if (own_worker_thread) {
	    ua_cfg.setThreadCnt(0);
	    ua_cfg.setMainThreadOnly(true);
	}

	/* Init endpoint */
	try {
	    ep.libInit(epConfig);
	} catch (Exception e) {
	    return;
	}

	/* Create transports. */
	try {
	    ep.transportCreate(pjsip_transport_type_e.PJSIP_TRANSPORT_UDP,
			       sipTpConfig);
	} catch (Exception e) {
	    System.out.println(e);
	}

	try {
	    ep.transportCreate(pjsip_transport_type_e.PJSIP_TRANSPORT_TCP,
			       sipTpConfig);
	} catch (Exception e) {
	    System.out.println(e);
	}

	try {
	    sipTpConfig.setPort(SIP_PORT+1);
	    ep.transportCreate(pjsip_transport_type_e.PJSIP_TRANSPORT_TLS,
			       sipTpConfig);
	} catch (Exception e) {
	    System.out.println(e);
	}

        /* Set SIP port back to default for JSON saved config */
        sipTpConfig.setPort(SIP_PORT);

	/* Create accounts. */
	for (int i = 0; i < accCfgs.size(); i++) {
	    MyAccountConfig my_cfg = accCfgs.get(i);

	    /* Customize account config */
	    my_cfg.accCfg.getNatConfig().setIceEnabled(true);
	    my_cfg.accCfg.getVideoConfig().setAutoTransmitOutgoing(true);
	    my_cfg.accCfg.getVideoConfig().setAutoShowIncoming(true);

	    /* Enable SRTP optional mode and without requiring SIP TLS transport */
	    my_cfg.accCfg.getMediaConfig().setSrtpUse(pjmedia_srtp_use.PJMEDIA_SRTP_OPTIONAL);
	    my_cfg.accCfg.getMediaConfig().setSrtpSecureSignaling(0);

	    MyAccount acc = addAcc(my_cfg.accCfg);
	    if (acc == null)
		continue;

	    /* Add Buddies */
	    for (int j = 0; j < my_cfg.buddyCfgs.size(); j++) {
		BuddyConfig bud_cfg = my_cfg.buddyCfgs.get(j);
		acc.addBuddy(bud_cfg);
	    }
	}

	/* Start. */
	try {
	    ep.libStart();
	} catch (Exception e) {
	    return;
	}
    }

    public MyAccount addAcc(AccountConfig cfg)
    {
	MyAccount acc = new MyAccount(cfg);
	try {
	    acc.create(cfg);
	} catch (Exception e) {
	    System.out.println(e);
	    acc = null;
	    return null;
	}

	accList.add(acc);
	return acc;
    }

    public void delAcc(MyAccount acc)
    {
	accList.remove(acc);
    }

    private void loadConfig(String filename)
    {
	JsonDocument json = new JsonDocument();

	try {
	    /* Load file */
	    json.loadFile(filename);
	    ContainerNode root = json.getRootContainer();

	    /* Read endpoint config */
	    epConfig.readObject(root);

	    /* Read transport config */
	    ContainerNode tp_node = root.readContainer("SipTransport");
	    sipTpConfig.readObject(tp_node);

	    /* Read account configs */
	    accCfgs.clear();
	    ContainerNode accs_node = root.readArray("accounts");
	    while (accs_node.hasUnread()) {
		MyAccountConfig acc_cfg = new MyAccountConfig();
		acc_cfg.readObject(accs_node);
		accCfgs.add(acc_cfg);
	    }
	} catch (Exception e) {
	    System.out.println(e);
	}

	/* Force delete json now, as I found that Java somehow destroys it
	* after lib has been destroyed and from non-registered thread.
	*/
	json.delete();
    }

    private void buildAccConfigs()
    {
	/* Sync accCfgs from accList */
	accCfgs.clear();
	for (int i = 0; i < accList.size(); i++) {
	    MyAccount acc = accList.get(i);
	    MyAccountConfig my_acc_cfg = new MyAccountConfig();
	    my_acc_cfg.accCfg = acc.cfg;

	    my_acc_cfg.buddyCfgs.clear();
	    for (int j = 0; j < acc.buddyList.size(); j++) {
		MyBuddy bud = acc.buddyList.get(j);
		my_acc_cfg.buddyCfgs.add(bud.cfg);
	    }

	    accCfgs.add(my_acc_cfg);
	}
    }

    private void saveConfig(String filename)
    {
	JsonDocument json = new JsonDocument();

	try {
	    /* Write endpoint config */
	    json.writeObject(epConfig);

	    /* Write transport config */
	    ContainerNode tp_node = json.writeNewContainer("SipTransport");
	    sipTpConfig.writeObject(tp_node);

	    /* Write account configs */
	    buildAccConfigs();
	    ContainerNode accs_node = json.writeNewArray("accounts");
	    for (int i = 0; i < accCfgs.size(); i++) {
		accCfgs.get(i).writeObject(accs_node);
	    }

	    /* Save file */
	    json.saveFile(filename);
	} catch (Exception e) {}

	/* Force delete json now, as I found that Java somehow destroys it
	* after lib has been destroyed and from non-registered thread.
	*/
	json.delete();
    }

    public void handleNetworkChange()
    {
	try{
	    System.out.println("Network change detected");
	    IpChangeParam changeParam = new IpChangeParam();
	    ep.handleIpChange(changeParam);
	} catch (Exception e) {
	    System.out.println(e);
	}
    }

    public void deinit()
    {
	String configPath = appDir + "/" + configName;
	saveConfig(configPath);

	/* Try force GC to avoid late destroy of PJ objects as they should be
	* deleted before lib is destroyed.
	*/
	Runtime.getRuntime().gc();

	/* Shutdown pjsua. Note that Endpoint destructor will also invoke
	* libDestroy(), so this will be a test of double libDestroy().
	*/
	try {
	    ep.libDestroy();
	} catch (Exception e) {}

	/* Force delete Endpoint here, to avoid deletion from a non-
	* registered thread (by GC?). 
	*/
	ep.delete();
	ep = null;
    } 
}
