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package com.earth2me.essentials.update.states;
import com.earth2me.essentials.update.AbstractWorkListener;
import com.earth2me.essentials.update.UpdateCheck;
import java.util.Iterator;
import org.bukkit.Bukkit;
import org.bukkit.entity.Player;
import org.bukkit.plugin.Plugin;
public class StateMachine extends AbstractWorkListener implements Runnable
{
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 UpdateCheck updateCheck)
{
super(plugin, updateCheck.getNewVersionInfo());
this.player = player;
states.clear();
final UpdateOrInstallation state = new UpdateOrInstallation(states, updateCheck);
current = states.put(UpdateOrInstallation.class, state);
}
public MachineResult askQuestion()
{
try
{
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;
}
}
catch (RuntimeException ex)
{
player.sendMessage(ex.getMessage());
finish();
result = MachineResult.ABORT;
}
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();
Bukkit.getScheduler().scheduleAsyncDelayedTask(getPlugin(), this);
}
@Override
public void run()
{
if (!iterator.hasNext())
{
Bukkit.getScheduler().scheduleSyncDelayedTask(getPlugin(), new Runnable()
{
@Override
public void run()
{
if (StateMachine.this.player.isOnline())
{
StateMachine.this.player.sendMessage("Installation done. Reloading server.");
}
finish();
Bukkit.getServer().reload();
}
});
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);
}
Bukkit.getScheduler().scheduleAsyncDelayedTask(getPlugin(), StateMachine.this);
}
});
}
private void finish()
{
current = null;
iterator = null;
states.clear();
getPlugin().getServer().getPluginManager().callEvent(new InstallationFinishedEvent());
}
public void resumeInstallation(final Player player)
{
this.player = player;
if (result == MachineResult.WAIT)
{
if (current == null)
{
throw new RuntimeException("State is WAIT, but current state is null!");
}
current.askQuestion(player);
}
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 an aborted installation.");
}
if (result == MachineResult.NONE)
{
throw new RuntimeException("State machine in an undefined state.");
}
}
}
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