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package zeroecho.core.spi;

import zeroecho.core.spec.AlgorithmIdentity;
import zeroecho.core.spec.AlgorithmSuite;

/**
 * Trusted-code declaration of an installed cryptographic execution domain.
 *
 * <p>
 * A capability describes implementation availability; it never defines
 * algorithm identity, X.509 semantics, defaults, or policy. Implementations must
 * provide a stable semantic fingerprint for deterministic conflict diagnostics.
 * Administrative configuration cannot provide implementation classes.
 * </p>
 */
public interface AlgorithmExecutionCapability {

    /**
     * Supported execution direction.
     */
    enum Direction {
        /** Signature generation. */
        SIGN,
        /** Signature verification. */
        VERIFY
    }

    /**
     * Returns a stable installed implementation identifier.
     *
     * @return namespaced provider implementation identifier
     */
    String implementationId();

    /**
     * Returns a deterministic description of the supported typed domain.
     *
     * @return stable non-secret domain fingerprint
     */
    String domainFingerprint();

    /**
     * Tests whether this implementation supports an exact identity and suite.
     *
     * @param identity  requested exact operation identity
     * @param suite     complete key and signature suite
     * @param direction requested direction
     * @return {@code true} only for tuples implemented exactly
     */
    boolean supports(AlgorithmIdentity identity, AlgorithmSuite suite, Direction direction);
}
