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package com.earth2me.essentials.update.states;
import com.earth2me.essentials.update.WorkListener;
import com.earth2me.essentials.update.VersionInfo;
import java.util.Iterator;
import org.bukkit.Bukkit;
import org.bukkit.entity.Player;
import org.bukkit.plugin.Plugin;
public class StateMachine extends WorkListener
{
public enum MachineResult
{
ABORT, WAIT, DONE, NONE
}
private final transient StateMap states = new StateMap();
private transient AbstractState current;
private transient Player player;
private transient MachineResult result = MachineResult.NONE;
public StateMachine(final Plugin plugin, final Player player, final VersionInfo newVersionInfo)
{
super(plugin, newVersionInfo);
this.player = player;
states.clear();
states.add(new EssentialsChat(states));
states.add(new EssentialsSpawn(states));
states.add(new EssentialsProtect(states));
states.add(new EssentialsGeoIP(states));
current = states.values().iterator().next();
}
public MachineResult askQuestion()
{
while (current.guessAnswer())
{
current = current.getNextState();
if (current == null)
{
result = MachineResult.DONE;
break;
}
}
if (current != null)
{
if (player.isOnline())
{
current.askQuestion(player);
}
result = MachineResult.WAIT;
}
return result;
}
public MachineResult reactOnMessage(final String message)
{
result = MachineResult.NONE;
final AbstractState next = current.reactOnAnswer(player, message);
if (next == null)
{
if (current.isAbortion())
{
finish();
result = MachineResult.ABORT;
}
else
{
result = MachineResult.DONE;
}
}
else
{
current = next;
askQuestion();
}
return result;
}
private transient Iterator<AbstractState> iterator;
public void startWork()
{
iterator = states.values().iterator();
callStateWork();
}
private void callStateWork()
{
if (!iterator.hasNext())
{
if (player.isOnline())
{
player.sendMessage("Installation done.");
}
finish();
return;
}
final AbstractState state = iterator.next();
state.doWork(this);
}
@Override
public void onWorkAbort(final String message)
{
finish();
Bukkit.getScheduler().scheduleSyncDelayedTask(getPlugin(), new Runnable()
{
@Override
public void run()
{
if (message != null && !message.isEmpty() && StateMachine.this.player.isOnline())
{
StateMachine.this.player.sendMessage(message);
}
}
});
}
@Override
public void onWorkDone(final String message)
{
Bukkit.getScheduler().scheduleSyncDelayedTask(getPlugin(), new Runnable()
{
@Override
public void run()
{
if (message != null && !message.isEmpty() && StateMachine.this.player.isOnline())
{
StateMachine.this.player.sendMessage(message);
}
StateMachine.this.callStateWork();
}
});
}
private void finish()
{
iterator = null;
states.clear();
getPlugin().getServer().getPluginManager().callEvent(new InstallationFinishedEvent());
}
public void resumeInstallation(Player player)
{
this.player = player;
if (result == MachineResult.WAIT)
{
if (current != null)
{
current.askQuestion(player);
}
else
{
throw new RuntimeException("State is WAIT, but current state is null!");
}
}
if (result == MachineResult.DONE && iterator != null)
{
player.sendMessage("Installation is still running.");
}
if (result == MachineResult.ABORT)
{
throw new RuntimeException("Player should not be able to resume a aborted installation.");
}
if (result == MachineResult.NONE)
{
throw new RuntimeException("State machine in an undefined state.");
}
}
}
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