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package fi.evolver.basics.spring.lock;

import java.time.Duration;
import java.time.Instant;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import fi.evolver.basics.spring.lock.entity.Lock;

/**
 * Provides database-persisted non-renewable locks that can be used for cluster-wide exclusive access.
 */
@Service
public class LockService {
	private static final int RETRY_INTERVAL_MS = 1000;


	private final LockRepository lockRepository;


	@Autowired
	private LockService(LockRepository lockRepository) {
		this.lockRepository = lockRepository;
	}


	public LockHandle takeLock(String name, Duration maxValidity, Duration acquireRetryDuration) throws LockException {
		Instant retryThreshold = Instant.now().plus(acquireRetryDuration).minusMillis(RETRY_INTERVAL_MS);
		Lock lock;

		while ((lock = lockRepository.tryTakeLock(name, maxValidity)) == null && Instant.now().isBefore(retryThreshold)) {
			try {
				Thread.sleep(RETRY_INTERVAL_MS);
			}
			catch (InterruptedException e) {
				Thread.currentThread().interrupt();
				throw new LockException(name);
			}
		}

		if (lock == null)
			throw new LockException(name);
		return new LockHandle(lockRepository, lock);
	}


	/**
	 * @deprecated use {@link #takeLock(String, Duration, Duration)}
	 */
	@Deprecated
	public LockHandle takeLock(String name, int validMs, int tryForMs) throws LockException {
		return takeLock(name, Duration.ofMillis(validMs), Duration.ofMillis(tryForMs));
	}


	public LockHandle takeLock(String name, Duration maxValidity) throws LockException {
		Lock lock = lockRepository.tryTakeLock(name, maxValidity);
		if (lock == null)
			throw new LockException(name);
		return new LockHandle(lockRepository, lock);
	}


	/**
	 * @deprecated use {@link #takeLock(String, Duration)}
	 */
	@Deprecated
	public LockHandle takeLock(String name, int validMs) throws LockException {
		return takeLock(name, Duration.ofMillis(validMs));
	}
}