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package eu.siacs.conversations.entities;

import android.content.ContentValues;
import android.database.Cursor;
import android.os.SystemClock;
import android.util.Pair;

import eu.siacs.conversations.crypto.PgpDecryptionService;
import net.java.otr4j.crypto.OtrCryptoEngineImpl;
import net.java.otr4j.crypto.OtrCryptoException;

import org.json.JSONException;
import org.json.JSONObject;

import java.security.PublicKey;
import java.security.interfaces.DSAPublicKey;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CopyOnWriteArraySet;

import eu.siacs.conversations.Config;
import eu.siacs.conversations.R;
import eu.siacs.conversations.crypto.OtrService;
import eu.siacs.conversations.crypto.axolotl.AxolotlService;
import eu.siacs.conversations.services.XmppConnectionService;
import eu.siacs.conversations.xmpp.XmppConnection;
import eu.siacs.conversations.xmpp.jid.InvalidJidException;
import eu.siacs.conversations.xmpp.jid.Jid;

public class Account extends AbstractEntity {

	public static final String TABLENAME = "accounts";

	public static final String USERNAME = "username";
	public static final String SERVER = "server";
	public static final String PASSWORD = "password";
	public static final String OPTIONS = "options";
	public static final String ROSTERVERSION = "rosterversion";
	public static final String KEYS = "keys";
	public static final String AVATAR = "avatar";
	public static final String DISPLAY_NAME = "display_name";
	public static final String HOSTNAME = "hostname";
	public static final String PORT = "port";

	public static final String PINNED_MECHANISM_KEY = "pinned_mechanism";

	public static final int OPTION_USETLS = 0;
	public static final int OPTION_DISABLED = 1;
	public static final int OPTION_REGISTER = 2;
	public static final int OPTION_USECOMPRESSION = 3;
	public final HashSet<Pair<String, String>> inProgressDiscoFetches = new HashSet<>();

	public boolean httpUploadAvailable(long filesize) {
		return xmppConnection != null && xmppConnection.getFeatures().httpUpload(filesize);
	}

	public boolean httpUploadAvailable() {
		return httpUploadAvailable(0);
	}

	public void setDisplayName(String displayName) {
		this.displayName = displayName;
	}

	public String getDisplayName() {
		return displayName;
	}

	public XmppConnection.Identity getServerIdentity() {
		if (xmppConnection == null) {
			return XmppConnection.Identity.UNKNOWN;
		} else {
			return xmppConnection.getServerIdentity();
		}
	}

	public enum State {
		DISABLED,
		OFFLINE,
		CONNECTING,
		ONLINE,
		NO_INTERNET,
		UNAUTHORIZED(true),
		SERVER_NOT_FOUND(true),
		REGISTRATION_FAILED(true),
		REGISTRATION_CONFLICT(true),
		REGISTRATION_SUCCESSFUL,
		REGISTRATION_NOT_SUPPORTED(true),
		SECURITY_ERROR(true),
		INCOMPATIBLE_SERVER(true),
		TOR_NOT_AVAILABLE(true);

		private final boolean isError;

		public boolean isError() {
			return this.isError;
		}

		private State(final boolean isError) {
			this.isError = isError;
		}

		private State() {
			this(false);
		}

		public int getReadableId() {
			switch (this) {
				case DISABLED:
					return R.string.account_status_disabled;
				case ONLINE:
					return R.string.account_status_online;
				case CONNECTING:
					return R.string.account_status_connecting;
				case OFFLINE:
					return R.string.account_status_offline;
				case UNAUTHORIZED:
					return R.string.account_status_unauthorized;
				case SERVER_NOT_FOUND:
					return R.string.account_status_not_found;
				case NO_INTERNET:
					return R.string.account_status_no_internet;
				case REGISTRATION_FAILED:
					return R.string.account_status_regis_fail;
				case REGISTRATION_CONFLICT:
					return R.string.account_status_regis_conflict;
				case REGISTRATION_SUCCESSFUL:
					return R.string.account_status_regis_success;
				case REGISTRATION_NOT_SUPPORTED:
					return R.string.account_status_regis_not_sup;
				case SECURITY_ERROR:
					return R.string.account_status_security_error;
				case INCOMPATIBLE_SERVER:
					return R.string.account_status_incompatible_server;
				case TOR_NOT_AVAILABLE:
					return R.string.account_status_tor_unavailable;
				default:
					return R.string.account_status_unknown;
			}
		}
	}

	public List<Conversation> pendingConferenceJoins = new CopyOnWriteArrayList<>();
	public List<Conversation> pendingConferenceLeaves = new CopyOnWriteArrayList<>();

	private static final String KEY_PGP_SIGNATURE = "pgp_signature";
	private static final String KEY_PGP_ID = "pgp_id";

	protected Jid jid;
	protected String password;
	protected int options = 0;
	protected String rosterVersion;
	protected State status = State.OFFLINE;
	protected JSONObject keys = new JSONObject();
	protected String avatar;
	protected String displayName = null;
	protected String hostname = null;
	protected int port = 5222;
	protected boolean online = false;
	private OtrService mOtrService = null;
	private AxolotlService axolotlService = null;
	private PgpDecryptionService pgpDecryptionService = null;
	private XmppConnection xmppConnection = null;
	private long mEndGracePeriod = 0L;
	private String otrFingerprint;
	private final Roster roster = new Roster(this);
	private List<Bookmark> bookmarks = new CopyOnWriteArrayList<>();
	private final Collection<Jid> blocklist = new CopyOnWriteArraySet<>();

	public Account(final Jid jid, final String password) {
		this(java.util.UUID.randomUUID().toString(), jid,
				password, 0, null, "", null, null, null, 5222);
	}

	private Account(final String uuid, final Jid jid,
			final String password, final int options, final String rosterVersion, final String keys,
			final String avatar, String displayName, String hostname, int port) {
		this.uuid = uuid;
		this.jid = jid;
		if (jid.isBareJid()) {
			this.setResource("mobile");
		}
		this.password = password;
		this.options = options;
		this.rosterVersion = rosterVersion;
		try {
			this.keys = new JSONObject(keys);
		} catch (final JSONException ignored) {
			this.keys = new JSONObject();
		}
		this.avatar = avatar;
		this.displayName = displayName;
		this.hostname = hostname;
		this.port = port;
	}

	public static Account fromCursor(final Cursor cursor) {
		Jid jid = null;
		try {
			jid = Jid.fromParts(cursor.getString(cursor.getColumnIndex(USERNAME)),
					cursor.getString(cursor.getColumnIndex(SERVER)), "mobile");
		} catch (final InvalidJidException ignored) {
		}
		return new Account(cursor.getString(cursor.getColumnIndex(UUID)),
				jid,
				cursor.getString(cursor.getColumnIndex(PASSWORD)),
				cursor.getInt(cursor.getColumnIndex(OPTIONS)),
				cursor.getString(cursor.getColumnIndex(ROSTERVERSION)),
				cursor.getString(cursor.getColumnIndex(KEYS)),
				cursor.getString(cursor.getColumnIndex(AVATAR)),
				cursor.getString(cursor.getColumnIndex(DISPLAY_NAME)),
				cursor.getString(cursor.getColumnIndex(HOSTNAME)),
				cursor.getInt(cursor.getColumnIndex(PORT)));
	}

	public boolean isOptionSet(final int option) {
		return ((options & (1 << option)) != 0);
	}

	public void setOption(final int option, final boolean value) {
		if (value) {
			this.options |= 1 << option;
		} else {
			this.options &= ~(1 << option);
		}
	}

	public String getUsername() {
		return jid.getLocalpart();
	}

	public void setJid(final Jid jid) {
		this.jid = jid;
	}

	public Jid getServer() {
		return jid.toDomainJid();
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(final String password) {
		this.password = password;
	}

	public void setHostname(String hostname) {
		this.hostname = hostname;
	}

	public String getHostname() {
		return this.hostname == null ? "" : this.hostname;
	}

	public boolean isOnion() {
		return getServer().toString().toLowerCase().endsWith(".onion");
	}

	public void setPort(int port) {
		this.port = port;
	}

	public int getPort() {
		return this.port;
	}

	public State getStatus() {
		if (isOptionSet(OPTION_DISABLED)) {
			return State.DISABLED;
		} else {
			return this.status;
		}
	}

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

	public boolean errorStatus() {
		return getStatus().isError();
	}

	public boolean hasErrorStatus() {
		return getXmppConnection() != null && getStatus().isError() && getXmppConnection().getAttempt() >= 3;
	}

	public String getResource() {
		return jid.getResourcepart();
	}

	public boolean setResource(final String resource) {
		final String oldResource = jid.getResourcepart();
		if (oldResource == null || !oldResource.equals(resource)) {
			try {
				jid = Jid.fromParts(jid.getLocalpart(), jid.getDomainpart(), resource);
				return true;
			} catch (final InvalidJidException ignored) {
				return true;
			}
		}
		return false;
	}

	public Jid getJid() {
		return jid;
	}

	public JSONObject getKeys() {
		return keys;
	}

	public String getKey(final String name) {
		return this.keys.optString(name, null);
	}

	public boolean setKey(final String keyName, final String keyValue) {
		try {
			this.keys.put(keyName, keyValue);
			return true;
		} catch (final JSONException e) {
			return false;
		}
	}

	public boolean setPrivateKeyAlias(String alias) {
		return setKey("private_key_alias", alias);
	}

	public String getPrivateKeyAlias() {
		return getKey("private_key_alias");
	}

	@Override
	public ContentValues getContentValues() {
		final ContentValues values = new ContentValues();
		values.put(UUID, uuid);
		values.put(USERNAME, jid.getLocalpart());
		values.put(SERVER, jid.getDomainpart());
		values.put(PASSWORD, password);
		values.put(OPTIONS, options);
		values.put(KEYS, this.keys.toString());
		values.put(ROSTERVERSION, rosterVersion);
		values.put(AVATAR, avatar);
		values.put(DISPLAY_NAME, displayName);
		values.put(HOSTNAME, hostname);
		values.put(PORT, port);
		return values;
	}

	public AxolotlService getAxolotlService() {
		return axolotlService;
	}

	public void initAccountServices(final XmppConnectionService context) {
		this.mOtrService = new OtrService(context, this);
		this.axolotlService = new AxolotlService(this, context);
		if (xmppConnection != null) {
			xmppConnection.addOnAdvancedStreamFeaturesAvailableListener(axolotlService);
		}
		this.pgpDecryptionService = new PgpDecryptionService(context);
	}

	public OtrService getOtrService() {
		return this.mOtrService;
	}

	public PgpDecryptionService getPgpDecryptionService() {
		return pgpDecryptionService;
	}

	public XmppConnection getXmppConnection() {
		return this.xmppConnection;
	}

	public void setXmppConnection(final XmppConnection connection) {
		this.xmppConnection = connection;
	}

	public String getOtrFingerprint() {
		if (this.otrFingerprint == null) {
			try {
				if (this.mOtrService == null) {
					return null;
				}
				final PublicKey publicKey = this.mOtrService.getPublicKey();
				if (publicKey == null || !(publicKey instanceof DSAPublicKey)) {
					return null;
				}
				this.otrFingerprint = new OtrCryptoEngineImpl().getFingerprint(publicKey);
				return this.otrFingerprint;
			} catch (final OtrCryptoException ignored) {
				return null;
			}
		} else {
			return this.otrFingerprint;
		}
	}

	public String getRosterVersion() {
		if (this.rosterVersion == null) {
			return "";
		} else {
			return this.rosterVersion;
		}
	}

	public void setRosterVersion(final String version) {
		this.rosterVersion = version;
	}

	public int countPresences() {
		return this.getRoster().getContact(this.getJid().toBareJid()).getPresences().size();
	}

	public String getPgpSignature() {
		try {
			if (keys.has(KEY_PGP_SIGNATURE) && !"null".equals(keys.getString(KEY_PGP_SIGNATURE))) {
				return keys.getString(KEY_PGP_SIGNATURE);
			} else {
				return null;
			}
		} catch (final JSONException e) {
			return null;
		}
	}

	public boolean setPgpSignature(String signature) {
		try {
			keys.put(KEY_PGP_SIGNATURE, signature);
		} catch (JSONException e) {
			return false;
		}
		return true;
	}

	public boolean unsetPgpSignature() {
		try {
			keys.put(KEY_PGP_SIGNATURE, JSONObject.NULL);
		} catch (JSONException e) {
			return false;
		}
		return true;
	}

	public long getPgpId() {
		if (keys.has(KEY_PGP_ID)) {
			try {
				return keys.getLong(KEY_PGP_ID);
			} catch (JSONException e) {
				return -1;
			}
		} else {
			return -1;
		}
	}

	public boolean setPgpSignId(long pgpID) {
		try {
			keys.put(KEY_PGP_ID, pgpID);
		} catch (JSONException e) {
			return false;
		}
		return true;
	}

	public Roster getRoster() {
		return this.roster;
	}

	public List<Bookmark> getBookmarks() {
		return this.bookmarks;
	}

	public void setBookmarks(final List<Bookmark> bookmarks) {
		this.bookmarks = bookmarks;
	}

	public boolean hasBookmarkFor(final Jid conferenceJid) {
		for (final Bookmark bookmark : this.bookmarks) {
			final Jid jid = bookmark.getJid();
			if (jid != null && jid.equals(conferenceJid.toBareJid())) {
				return true;
			}
		}
		return false;
	}

	public boolean setAvatar(final String filename) {
		if (this.avatar != null && this.avatar.equals(filename)) {
			return false;
		} else {
			this.avatar = filename;
			return true;
		}
	}

	public String getAvatar() {
		return this.avatar;
	}

	public void activateGracePeriod() {
		this.mEndGracePeriod = SystemClock.elapsedRealtime()
			+ (Config.CARBON_GRACE_PERIOD * 1000);
	}

	public void deactivateGracePeriod() {
		this.mEndGracePeriod = 0L;
	}

	public boolean inGracePeriod() {
		return SystemClock.elapsedRealtime() < this.mEndGracePeriod;
	}

	public String getShareableUri() {
		final String fingerprint = this.getOtrFingerprint();
		if (fingerprint != null) {
			return "xmpp:" + this.getJid().toBareJid().toString() + "?otr-fingerprint="+fingerprint;
		} else {
			return "xmpp:" + this.getJid().toBareJid().toString();
		}
	}

	public boolean isBlocked(final ListItem contact) {
		final Jid jid = contact.getJid();
		return jid != null && (blocklist.contains(jid.toBareJid()) || blocklist.contains(jid.toDomainJid()));
	}

	public boolean isBlocked(final Jid jid) {
		return jid != null && blocklist.contains(jid.toBareJid());
	}

	public Collection<Jid> getBlocklist() {
		return this.blocklist;
	}

	public void clearBlocklist() {
		getBlocklist().clear();
	}

	public boolean isOnlineAndConnected() {
		return this.getStatus() == State.ONLINE && this.getXmppConnection() != null;
	}
}