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package org.jboss.resteasy.jose.jwe;

import java.io.ByteArrayOutputStream;
import java.lang.reflect.Type;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.interfaces.RSAPublicKey;
import java.util.Base64;

import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import jakarta.ws.rs.core.GenericEntity;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.MultivaluedHashMap;
import jakarta.ws.rs.ext.MessageBodyWriter;
import jakarta.ws.rs.ext.Providers;

import org.jboss.resteasy.jose.i18n.Messages;
import org.jboss.resteasy.jose.jwe.crypto.DirectEncrypter;
import org.jboss.resteasy.jose.jwe.crypto.RSAEncrypter;
import org.jboss.resteasy.spi.ResteasyProviderFactory;

/**
 *
 * Encrypt content. Default EncryptionMethod is A256CBC_HS512
 *
 * @author Bill Burke
 * @version $Revision: 1 $
 */
public class JWEBuilder {
    String type;
    String contentType;
    byte[] contentBytes;
    Providers providers;
    CompressionAlgorithm compressionAlgorithm;
    EncryptionMethod encryptionMethod = EncryptionMethod.A256CBC_HS512;

    public JWEBuilder() {
        this(ResteasyProviderFactory.getInstance());
    }

    public JWEBuilder(final Providers providers) {
        this.providers = providers;
    }

    public JWEBuilder type(String type) {
        this.type = type;
        return this;
    }

    public JWEBuilder contentType(String type) {
        this.contentType = type;
        return this;
    }

    public JWEBuilder contentType(MediaType type) {
        this.contentType = type.toString();
        return this;
    }

    public EncryptionBuilder contentBytes(byte[] bytes) {
        this.contentBytes = bytes;
        return new EncryptionBuilder();
    }

    public EncryptionBuilder content(Object content) {
        contentBytes = marshalContent(content, MediaType.valueOf(contentType));
        return new EncryptionBuilder();
    }

    public EncryptionBuilder content(Object content, MediaType marshalTo) {
        contentBytes = marshalContent(content, marshalTo);
        return new EncryptionBuilder();
    }

    protected String encodeHeader(Algorithm alg) {
        StringBuilder builder = new StringBuilder("{");
        builder.append("\"alg\":\"").append(alg.toString()).append("\"");
        builder.append(",\"enc\":\"").append(encryptionMethod.toString()).append("\"");
        if (compressionAlgorithm != null)
            builder.append(",\"zip\":\"").append(compressionAlgorithm.toString()).append("\"");
        if (type != null)
            builder.append(",\"typ\" : \"").append(type).append("\"");
        if (contentType != null)
            builder.append(",\"cty\":\"").append(contentType).append("\"");
        builder.append("}");
        String json = builder.toString();
        return Base64.getUrlEncoder().encodeToString(json.getBytes(StandardCharsets.UTF_8));
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    protected byte[] marshalContent(Object content, MediaType marshalTo) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Class type = content.getClass();
        Type genericType = null;
        Object obj = content;
        if (content instanceof GenericEntity) {
            GenericEntity ge = (GenericEntity) content;
            obj = ge.getEntity();
            type = ge.getRawType();
            genericType = ge.getType();
        }
        if (genericType == null)
            genericType = type;

        MessageBodyWriter writer = providers.getMessageBodyWriter(type, genericType, null, marshalTo);
        if (writer == null)
            throw new IllegalStateException(Messages.MESSAGES.unableToFindMessageBodyWriter());
        try {
            writer.writeTo(obj, type, genericType, null, marshalTo, new MultivaluedHashMap(), baos);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return baos.toByteArray();
    }

    public class EncryptionBuilder {
        public EncryptionBuilder compressed() {
            compressionAlgorithm = CompressionAlgorithm.DEF;
            return this;
        }

        public EncryptionBuilder A128CBC_HS256() {
            encryptionMethod = EncryptionMethod.A128CBC_HS256;
            return this;
        }

        public EncryptionBuilder A256CBC_HS512() {
            encryptionMethod = EncryptionMethod.A256CBC_HS512;
            return this;
        }

        public EncryptionBuilder A128GCM() {
            encryptionMethod = EncryptionMethod.A128GCM;
            return this;
        }

        public EncryptionBuilder A256GCM() {
            encryptionMethod = EncryptionMethod.A256GCM;
            return this;
        }

        public String RSA1_5(RSAPublicKey publicKey) {
            String header = encodeHeader(Algorithm.RSA1_5);
            return RSAEncrypter.encrypt(Algorithm.RSA1_5, encryptionMethod, compressionAlgorithm, publicKey, header,
                    contentBytes);
        }

        public String RSA_OAEP(RSAPublicKey publicKey) {
            String header = encodeHeader(Algorithm.RSA_OAEP);
            return RSAEncrypter.encrypt(Algorithm.RSA_OAEP, encryptionMethod, compressionAlgorithm, publicKey, header,
                    contentBytes);
        }

        /**
         * Hashes the string into the required secret key size defined by the EncryptionMethod.
         *
         * @param secret secret key
         * @return encrypted data
         */
        public String dir(String secret) {
            MessageDigest digest = encryptionMethod.createSecretDigester();
            byte[] hash = digest.digest(secret.getBytes(StandardCharsets.UTF_8));
            return dir(hash);
        }

        /**
         * Secret must meet the size requirements of the EncryptionMethod.
         *
         * @param secret secret key
         * @return encrypted data
         */
        public String dir(byte[] secret) {
            SecretKey key = new SecretKeySpec(secret, "AES");
            return dir(key);
        }

        public String dir(SecretKey key) {
            if (!key.getAlgorithm().equals("AES"))
                throw new IllegalArgumentException(Messages.MESSAGES.algorithmOfSharedSymmetricKey());
            byte[] keyBytes = key.getEncoded();

            if (keyBytes.length != 16 && keyBytes.length != 32 && keyBytes.length != 64) {

                throw new IllegalArgumentException(Messages.MESSAGES.lengthOfSharedSymmetricKey());
            }

            String header = encodeHeader(Algorithm.dir);
            return DirectEncrypter.encrypt(encryptionMethod, compressionAlgorithm, header, key, contentBytes);

        }

    }

}