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package org.openjdk.jmc.flightrecorder.rules.jdk.memory;

import java.text.MessageFormat;
import java.util.Collection;
import java.util.Collections;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;
import java.util.concurrent.RunnableFuture;

import org.openjdk.jmc.common.IDisplayable;
import org.openjdk.jmc.common.item.IItemCollection;
import org.openjdk.jmc.common.unit.IQuantity;
import org.openjdk.jmc.common.unit.UnitLookup;
import org.openjdk.jmc.common.util.IPreferenceValueProvider;
import org.openjdk.jmc.common.util.TypedPreference;
import org.openjdk.jmc.flightrecorder.jdk.JdkAggregators;
import org.openjdk.jmc.flightrecorder.jdk.JdkTypeIDs;
import org.openjdk.jmc.flightrecorder.rules.IRule;
import org.openjdk.jmc.flightrecorder.rules.Result;
import org.openjdk.jmc.flightrecorder.rules.jdk.messages.internal.Messages;
import org.openjdk.jmc.flightrecorder.rules.util.JfrRuleTopics;
import org.openjdk.jmc.flightrecorder.rules.util.RulesToolkit;
import org.openjdk.jmc.flightrecorder.rules.util.RulesToolkit.EventAvailability;

public class MetaspaceOomRule implements IRule {

	private static final String RESULT_ID = "MetaspaceOom"; //$NON-NLS-1$

	private Result getResult(IItemCollection items, IPreferenceValueProvider valueProvider) {
		EventAvailability eventAvailability = RulesToolkit.getEventAvailability(items, JdkTypeIDs.METASPACE_OOM);
		if (eventAvailability == EventAvailability.UNKNOWN || eventAvailability == EventAvailability.DISABLED) {
			return RulesToolkit.getEventAvailabilityResult(this, items, eventAvailability, JdkTypeIDs.METASPACE_OOM);
		}

		IQuantity oomCount = items.getAggregate(JdkAggregators.METASPACE_OOM_COUNT);
		if (oomCount != null && oomCount.doubleValue() > 0) {
			// FIXME: Configuration attribute instead of hard coded 1 as warning limit
			double score = RulesToolkit.mapExp100(oomCount.clampedLongValueIn(UnitLookup.NUMBER_UNITY), 1);
			String message = MessageFormat.format(Messages.getString(Messages.MetaspaceOomRuleFactory_TEXT_WARN),
					oomCount.displayUsing(IDisplayable.AUTO));
			String longMessage = message + " " + Messages.getString(Messages.MetaspaceOomRuleFactory_TEXT_WARN_LONG); //$NON-NLS-1$
			return new Result(this, score, message, longMessage);
		}
		return new Result(this, 0, Messages.getString(Messages.MetaspaceOomRuleFactory_TEXT_OK));
	}

	@Override
	public RunnableFuture<Result> evaluate(final IItemCollection items, final IPreferenceValueProvider valueProvider) {
		FutureTask<Result> evaluationTask = new FutureTask<>(new Callable<Result>() {
			@Override
			public Result call() throws Exception {
				return getResult(items, valueProvider);
			}
		});
		return evaluationTask;
	}

	@Override
	public Collection<TypedPreference<?>> getConfigurationAttributes() {
		return Collections.emptyList();
	}

	@Override
	public String getId() {
		return RESULT_ID;
	}

	@Override
	public String getName() {
		return Messages.getString(Messages.MetaspaceOomRuleFactory_RULE_NAME);
	}

	@Override
	public String getTopic() {
		return JfrRuleTopics.GARBAGE_COLLECTION_TOPIC;
	}
}