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package org.bimserver;

/******************************************************************************
 * Copyright (C) 2009-2016  BIMserver.org
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see {@literal}.
 *****************************************************************************/

import java.util.HashSet;
import java.util.Set;

import org.bimserver.database.DatabaseSession;
import org.bimserver.database.OldQuery;
import org.bimserver.database.migrations.InconsistentModelsException;
import org.bimserver.database.migrations.MigrationException;
import org.bimserver.emf.IdEObject;
import org.bimserver.emf.IfcModelInterface;
import org.bimserver.models.store.ServerInfo;
import org.bimserver.models.store.ServerSettings;
import org.bimserver.models.store.ServerState;
import org.bimserver.models.store.StoreFactory;
import org.bimserver.models.store.StorePackage;
import org.bimserver.models.store.User;
import org.bimserver.models.store.UserType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ServerInfoManager {
	private static final Logger LOGGER = LoggerFactory.getLogger(ServerInfoManager.class);
	private BimServer bimServer;
	private final Set stateChangeListeners = new HashSet();
	private final ServerInfo serverInfo = StoreFactory.eINSTANCE.createServerInfo();
	
	public void registerStateChangeListener(StateChangeListener stateChangeListener) {
		stateChangeListeners.add(stateChangeListener);
	}

	private void notifyStateChangeListeners(ServerState oldState, ServerState newState) {
		for (StateChangeListener stateChangeListener : stateChangeListeners) {
			stateChangeListener.stateChanged(oldState, newState);
		}
	}

	public void update() {
		try {
			serverInfo.setVersion(bimServer.getSConverter().convertFromSObject(bimServer.getVersionChecker().getLocalVersion(), null));
		} catch (BimserverDatabaseException e) {
			LOGGER.error("", e);
		}
		if (bimServer.getDatabase().getMigrator().migrationRequired()) {
			setServerState(ServerState.MIGRATION_REQUIRED);
			if (bimServer.getConfig().isAutoMigrate()) {
				try {
					bimServer.getDatabase().getMigrator().migrate();
					setServerState(ServerState.RUNNING);
				} catch (MigrationException | InconsistentModelsException e) {
					LOGGER.error("", e);
				}
			}
		} else if (bimServer.getDatabase().getMigrator().migrationImpossible()) {
			setServerState(ServerState.MIGRATION_IMPOSSIBLE);
		} else {
			DatabaseSession session = bimServer.getDatabase().createSession();
			try {
				boolean adminFound = false;
				ServerSettings settings = bimServer.getServerSettingsCache().getServerSettings();
				IfcModelInterface users = session.getAllOfType(StorePackage.eINSTANCE.getUser(), OldQuery.getDefault());
				for (IdEObject idEObject : users.getValues()) {
					if (idEObject instanceof User) {
						User user = (User)idEObject;
						if (user.getUserType() == UserType.ADMIN) {
							adminFound = true;
							break;
						}
					}
				}
				if (settings.getSiteAddress().isEmpty() || settings.getSmtpServer().isEmpty() || !adminFound) {
					setServerState(ServerState.NOT_SETUP);
				} else {
					setServerState(ServerState.RUNNING);
				}
			} catch (BimserverDatabaseException e) {
				LOGGER.error("", e);
			} finally {
				session.close();
			}
		}
	}

	public boolean isAvailable() {
		return serverInfo.getErrorMessage() == null && serverInfo.getServerState() == ServerState.RUNNING;
	}

	public void setOutOfMemory() {
		serverInfo.setErrorMessage("This server is out of memory, more info on how to fix this can be found on support.opensourcebim.org. Or let us handle the hosting stuff and join our VIP hosting solutions at vip.bimserver.org.  ");
	}

	public void setServerState(ServerState serverState) {
		ServerState oldState = serverInfo.getServerState();
		serverInfo.setServerState(serverState);
		LOGGER.info("Changing server state to " + serverState);
		notifyStateChangeListeners(oldState, serverState);
	}

	public void setErrorMessage(String message) {
		serverInfo.setErrorMessage(message);
	}

	public ServerState getServerState() {
		return serverInfo.getServerState();
	}

	public ServerInfo getServerInfo() {
		return serverInfo;
	}

	public void init(BimServer bimServer) {
		this.bimServer = bimServer;
	}
}