package de.gultsch.chat.entities;

import java.security.interfaces.DSAPublicKey;
import java.util.ArrayList;
import java.util.List;

import de.gultsch.chat.crypto.OtrEngine;
import de.gultsch.chat.xmpp.XmppConnection;

import net.java.otr4j.OtrException;
import net.java.otr4j.crypto.OtrCryptoEngineImpl;
import net.java.otr4j.crypto.OtrCryptoException;
import net.java.otr4j.session.SessionID;
import net.java.otr4j.session.SessionImpl;
import net.java.otr4j.session.SessionStatus;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.util.Log;

public class Conversation extends AbstractEntity {

	private static final long serialVersionUID = -6727528868973996739L;
	
	public static final String TABLENAME = "conversations";
	
	public static final int STATUS_AVAILABLE = 0;
	public static final int STATUS_ARCHIVED = 1;
	public static final int STATUS_DELETED = 2;
	
	public static final int MODE_MULTI = 1;
	public static final int MODE_SINGLE = 0;

	public static final String NAME = "name";
	public static final String ACCOUNT = "accountUuid";
	public static final String CONTACT = "contactUuid";
	public static final String CONTACTJID = "contactJid";
	public static final String STATUS = "status";
	public static final String CREATED = "created";
	public static final String MODE = "mode";

	private String name;
	private String contactUuid;
	private String accountUuid;
	private String contactJid;
	private int status;
	private long created;
	private int mode;

	private transient List<Message> messages = null;
	private transient Account account = null;
	private transient Contact contact;
	
	private transient SessionImpl otrSession;
	
	private transient String otrFingerprint = null;
	
	public int nextMessageEncryption = Message.ENCRYPTION_NONE;

	public Conversation(String name, Account account,
			String contactJid, int mode) {
		this(java.util.UUID.randomUUID().toString(), name, null, account.getUuid(), contactJid, System
				.currentTimeMillis(), STATUS_AVAILABLE,mode);
		this.account = account;
	}

	public Conversation(String uuid, String name, String contactUuid,
			String accountUuid, String contactJid, long created, int status, int mode) {
		this.uuid = uuid;
		this.name = name;
		this.contactUuid = contactUuid;
		this.accountUuid = accountUuid;
		this.contactJid = contactJid;
		this.created = created;
		this.status = status;
		this.mode = mode;
	}

	public List<Message> getMessages() {
		if (messages == null) this.messages = new ArrayList<Message>(); //prevent null pointer
		
		//populate with Conversation (this)
		
		for(Message msg : messages) {
			msg.setConversation(this);
		}
		
		return messages;
	}
	
	public boolean isRead() {
		if ((this.messages == null)||(this.messages.size() == 0)) return true;
		return this.messages.get(this.messages.size() - 1).isRead();
	}
	
	public void markRead() {
		if (this.messages == null) return;
		for(int i = this.messages.size() -1; i >= 0; --i) {
			if (messages.get(i).isRead()) return;
			this.messages.get(i).markRead();
		}
	}
	
	public Message getLatestMessage() {
		if ((this.messages == null)||(this.messages.size()==0)) {
			Message message = new Message(this,"",Message.ENCRYPTION_NONE);
			message.setTime(getCreated());
			return message;
		} else {
			return this.messages.get(this.messages.size() - 1);
		}
	}

	public void setMessages(List<Message> msgs) {
		this.messages = msgs;
	}

	public String getName() {
		if (this.contact!=null) {
			return this.contact.getDisplayName();
		} else {
			return this.name;
		}
	}

	public String getProfilePhotoString() {
		if (this.contact==null) {
			return null;
		} else {
			return this.contact.getProfilePhoto();
		}
	}

	public String getAccountUuid() {
		return this.accountUuid;
	}
	
	public Account getAccount() {
		return this.account;
	}
	
	public Contact getContact() {
		return this.contact;
	}
	
	public void setContact(Contact contact) {
		this.contact = contact;
		if (contact!=null) {
			this.contactUuid = contact.getUuid();
		}
	}

	public void setAccount(Account account) {
		this.account = account;
	}
	
	public String getContactJid() {
		return this.contactJid;
	}

	public Uri getProfilePhotoUri() {
		if (this.getProfilePhotoString() != null) {
			return Uri.parse(this.getProfilePhotoString());
		}
		return null;
	}

	public int getStatus() {
		return this.status;
	}
	
	public long getCreated() {
		return this.created;
	}

	public ContentValues getContentValues() {
		ContentValues values = new ContentValues();
		values.put(UUID, uuid);
		values.put(NAME, name);
		values.put(CONTACT, contactUuid);
		values.put(ACCOUNT, accountUuid);
		values.put(CONTACTJID, contactJid);
		values.put(CREATED, created);
		values.put(STATUS, status);
		values.put(MODE,mode);
		return values;
	}

	public static Conversation fromCursor(Cursor cursor) {
		return new Conversation(cursor.getString(cursor.getColumnIndex(UUID)),
				cursor.getString(cursor.getColumnIndex(NAME)),
				cursor.getString(cursor.getColumnIndex(CONTACT)),
				cursor.getString(cursor.getColumnIndex(ACCOUNT)),
				cursor.getString(cursor.getColumnIndex(CONTACTJID)),
				cursor.getLong(cursor.getColumnIndex(CREATED)),
				cursor.getInt(cursor.getColumnIndex(STATUS)),
				cursor.getInt(cursor.getColumnIndex(MODE)));
	}

	public void setStatus(int status) {
		this.status = status;
	}

	public int getMode() {
		return this.mode;
	}

	public void setMode(int mode) {
		this.mode = mode;
	}
	
	public void startOtrSession(Context context, String presence) {
		Log.d("xmppService","starting otr session with "+presence);
		SessionID sessionId = new SessionID(this.getContactJid(),presence,"xmpp");
		this.otrSession = new SessionImpl(sessionId, getAccount().getOtrEngine(context));
		try {
			this.otrSession.startSession();
		} catch (OtrException e) {
			Log.d("xmppServic","couldnt start otr");
		}
	}
	
	public SessionImpl getOtrSession() {
		return this.otrSession;
	}

	public void resetOtrSession() {
		this.otrSession = null;
	}
	
	public void endOtrIfNeeded() throws OtrException {
		if (this.otrSession!=null) {
			if (this.otrSession.getSessionStatus() == SessionStatus.ENCRYPTED) {
				this.otrSession.endSession();
			}
		}
		this.resetOtrSession();
	}

	public boolean hasValidOtrSession() {
		if (this.otrSession == null) {
			return false;
		} else {
			String foreignPresence = this.otrSession.getSessionID().getUserID();
			if (!getContact().getPresences().containsKey(foreignPresence)) {
				this.resetOtrSession();
				return false;
			}
			return true;
		}
	}
	
	public String getOtrFingerprint() {
		if (this.otrFingerprint == null) {
			try {
				DSAPublicKey remotePubKey = (DSAPublicKey) getOtrSession().getRemotePublicKey();
				StringBuilder builder = new StringBuilder(new OtrCryptoEngineImpl().getFingerprint(remotePubKey));
				builder.insert(8, " ");
				builder.insert(17, " ");
				builder.insert(26, " ");
				builder.insert(35, " ");
				this.otrFingerprint = builder.toString();
			} catch (OtrCryptoException e) {
				
			}
		}
		return this.otrFingerprint;
	}
}
