package tc.oc.pgm.rotation;
import java.time.Duration;
import java.time.Instant;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.SortedSet;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import org.bukkit.configuration.Configuration;
import tc.oc.commons.core.logging.ClassLogger;
import tc.oc.pgm.map.PGMMap;
import static com.google.common.base.Preconditions.checkNotNull;
public class RotationManager {
private final Logger logger;
private final Configuration config;
private final SortedSet<RotationProviderInfo> providers;
private String currentRotationName;
private RotationState defaultRotation;
public RotationManager(Logger logger, Configuration config, PGMMap defaultMap, Collection<RotationProviderInfo> providers) {
this.logger = ClassLogger.get(checkNotNull(logger, "logger"), getClass());
this.config = config;
this.providers = Collections.synchronizedSortedSet(Sets.newTreeSet(providers));
load(defaultMap);
}
public @Nonnull RotationState getRotation() {
RotationState rotation = this.getRotation(this.currentRotationName);
if(rotation == null) {
rotation = this.defaultRotation;
}
return rotation;
}
public @Nullable RotationState getRotation(@Nonnull String name) {
for(RotationProviderInfo info : this.providers) {
RotationState rotation = info.provider.getRotation(name);
if(rotation != null) {
return rotation;
}
}
return null;
}
public @Nonnull Map<String, RotationState> getRotations() {
Map<String, RotationState> rotations = Maps.newTreeMap();
for(RotationProviderInfo info : this.providers) {
for(Map.Entry<String, RotationState> rotation : info.provider.getRotations().entrySet()) {
if(!rotations.containsKey(rotation.getKey())) {
rotations.put(rotation.getKey(), rotation.getValue());
}
}
}
return ImmutableMap.copyOf(rotations);
}
public void setRotation(@Nonnull RotationState rotation) {
this.setRotation(this.currentRotationName, rotation);
}
public void setRotation(@Nonnull String name, @Nonnull RotationState rotation) {
Preconditions.checkNotNull(name, "rotation name");
Preconditions.checkNotNull(rotation, "rotation");
for(RotationProviderInfo info : this.providers) {
info.provider.saveRotation(name, rotation);
}
}
public @Nonnull String getCurrentRotationName() {
return this.currentRotationName;
}
public void setCurrentRotationName(@Nonnull String name) {
Preconditions.checkNotNull(name, "rotation name");
this.currentRotationName = name;
}
public @Nonnull List<RotationProvider> getProviders(@Nonnull String rotationName) {
ImmutableList.Builder<RotationProvider> providers = ImmutableList.builder();
for(RotationProviderInfo info : this.providers) {
if(info.provider.getRotation(rotationName) != null) {
providers.add(info.provider);
}
}
return providers.build();
}
public @Nullable RotationProvider getProviderByName(@Nonnull String name) {
for(RotationProviderInfo info : this.providers) {
if(info.name.equalsIgnoreCase(name)) {
return info.provider;
}
}
return null;
}
public void addProvider(@Nonnull RotationProvider provider, @Nonnull String name, int priority) {
Preconditions.checkNotNull(provider, "rotation provider");
Preconditions.checkNotNull(name, "name");
Preconditions.checkArgument(this.getProviderByName(name) == null, "provider is already registered to name");
RotationProviderInfo state = new RotationProviderInfo(provider, name, priority);
this.providers.add(state);
}
/**
* Reload all rotations and re-acquire all {@link PGMMap} objects from the map library.
* After calling this method, the rotation system should not have any references to
* {@link PGMMap}s that are not currently in the library.
*/
public boolean load(PGMMap defaultMap) {
this.defaultRotation = new RotationState(Collections.singletonList(defaultMap), 0);
this.currentRotationName = config.getString("rotation.default-name", "default");
logger.info("Loading rotations from " + providers.size() +
" providers. Fallback map is '" + defaultRotation.getMaps().get(0).getName() +
"'. Initial rotation name is '" + currentRotationName + "'");
Instant timeoutTime = Instant.now().plusMillis(config.getInt("rotation.initial-wait", 10*1000));
Map<RotationProviderInfo, Future<?>> loadingFutures = Maps.newHashMapWithExpectedSize(this.providers.size());
for(RotationProviderInfo info : this.providers) {
loadingFutures.put(info, info.provider.loadRotations());
}
boolean ranOutOfTime = false;
for(Map.Entry<RotationProviderInfo, Future<?>> futureEntry : loadingFutures.entrySet()) {
RotationProviderInfo info = futureEntry.getKey();
String name = info.name;
Future<?> future = futureEntry.getValue();
long wait = Duration.between(Instant.now(), timeoutTime).toMillis();
try {
future.get(wait, TimeUnit.MILLISECONDS);
} catch (TimeoutException e) {
ranOutOfTime = true;
this.logger.severe(String.format("Rotation provider '%s' failed to load before timeout.", name));
} catch (ExecutionException e) {
this.logger.log(Level.SEVERE, String.format("Rotation provider '%s' threw an exception while loading.", name), e.getCause());
} catch (InterruptedException e) {
this.logger.warning(String.format("Rotation provider '%s' was interrupted while trying to load.", name));
}
}
return !ranOutOfTime;
}
}