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package zeroecho.core.alg.mldsa;

import java.security.GeneralSecurityException;
import java.security.PrivateKey;
import java.security.PublicKey;

import zeroecho.core.AlgorithmFamily;
import zeroecho.core.KeyUsage;
import zeroecho.core.alg.AbstractCryptoAlgorithm;
import zeroecho.core.context.SignatureContext;
import zeroecho.core.spec.VoidSpec;

/**
 * ML-DSA (FIPS 204) signature algorithm binding for the ZeroEcho framework.
 *
 * <p>
 * This binding exposes ML-DSA as a first-class algorithm identity while relying
 * on the provider's ML-DSA JCA implementations.
 * </p>
 *
 * <p>
 * This algorithm registers two roles:
 * </p>
 * <ul>
 * <li>{@link KeyUsage#SIGN}: produces ML-DSA signatures using a
 * {@link PrivateKey}.</li>
 * <li>{@link KeyUsage#VERIFY}: verifies ML-DSA signatures using a
 * {@link PublicKey}.</li>
 * </ul>
 *
 * <p>
 * Both roles are configured with {@link VoidSpec}, as ML-DSA requires no
 * runtime context parameters beyond the key material.
 * </p>
 *
 * @since 1.0
 */
public final class MldsaAlgorithm extends AbstractCryptoAlgorithm {

    /**
     * Creates a new ML-DSA algorithm instance and registers its capabilities.
     *
     * @throws IllegalArgumentException if a signature context cannot be initialized
     *                                  due to provider errors
     */
    public MldsaAlgorithm() {
        super("ML-DSA", "MLDSA");

        capability(AlgorithmFamily.ASYMMETRIC, KeyUsage.SIGN, SignatureContext.class, PrivateKey.class, VoidSpec.class,
                (PrivateKey k, VoidSpec s) -> {
                    try {
                        return new MldsaSignatureContext(this, k);
                    } catch (GeneralSecurityException e) {
                        throw new IllegalArgumentException("Cannot init ML-DSA signer", e);
                    }
                }, () -> VoidSpec.INSTANCE);

        capability(AlgorithmFamily.ASYMMETRIC, KeyUsage.VERIFY, SignatureContext.class, PublicKey.class, VoidSpec.class,
                (PublicKey k, VoidSpec s) -> {
                    try {
                        return new MldsaSignatureContext(this, k);
                    } catch (GeneralSecurityException e) {
                        throw new IllegalArgumentException("Cannot init ML-DSA verifier", e);
                    }
                }, () -> VoidSpec.INSTANCE);

        registerAsymmetricKeyPairGenerator(MldsaKeyGenSpec.class, new MldsaKeyGenBuilder(),
                MldsaKeyGenSpec::defaultSpec);
        registerPublicKeyImporter(MldsaPublicKeySpec.class, new MldsaPublicKeyBuilder());
        registerPrivateKeyImporter(MldsaPrivateKeySpec.class, new MldsaPrivateKeyBuilder());
    }
}
