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package fi.evolver.basics.spring.log;

import fi.evolver.basics.spring.log.entity.MessageLogMetadata;
import fi.evolver.utils.ContextUtils;
import fi.evolver.utils.attribute.ContextRegistrableAttribute;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Optional;


/**
 * Sets a single metadata to use for all message logs in the current context.
 * The value is saved within the current context.
 *
 * @see LogMetadataAttribute
 */
public class MessageLogMetadataAttribute implements ContextRegistrableAttribute {
	static final ThreadLocal CONTEXT_LOG_METADATA = ThreadLocal.withInitial(MetadataMap::new);

	private final String name;


	/**
	 * Create a new message log metadata attribute.
	 *
	 * @param name The name of the message log metadata.
	 */
	public MessageLogMetadataAttribute(String name) {
		this.name = name;
	}


	@Override
	public String name() {
		return name;
	}

	@Override
	public Optional get() {
		return Optional.ofNullable(CONTEXT_LOG_METADATA.get().get(name));

	}

	@Override
	public void set(String value) {
		if (value != null) {
			CONTEXT_LOG_METADATA.get().put(name, value);
			ContextUtils.register(this);
		}
		else {
			CONTEXT_LOG_METADATA.get().remove(name);
		}
	}



	static List listMetadata() {
		return CONTEXT_LOG_METADATA.get().entrySet().stream()
				.filter(e -> e.getKey() != null && e.getValue() != null)
				.map(e -> new MessageLogMetadata(e.getKey(), e.getValue()))
				.toList();
	}

	@Override
	public Class type() {
		return String.class;
	}


	static class MetadataMap extends LinkedHashMap {
		private static final long serialVersionUID = 1L;

	}

}