/*
 * NIP-44: Encrypted Payloads (Versioned)
 * https://github.com/nostr-protocol/nips/blob/master/44.md
 */

#ifndef NOSTR_NIP044_H
#define NOSTR_NIP044_H

#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

// NIP-44 constants
// #define NOSTR_NIP44_MAX_PLAINTEXT_SIZE 65535

/**
 * NIP-44: Encrypt a message using ECDH + ChaCha20 + HMAC
 * 
 * @param sender_private_key 32-byte sender private key
 * @param recipient_public_key 32-byte recipient public key (x-only)
 * @param plaintext Message to encrypt
 * @param output Buffer for encrypted output (base64 encoded)
 * @param output_size Size of output buffer
 * @return NOSTR_SUCCESS on success, error code on failure
 */
int nostr_nip44_encrypt(const unsigned char* sender_private_key,
                       const unsigned char* recipient_public_key,
                       const char* plaintext,
                       char* output,
                       size_t output_size);

/**
 * NIP-44: Encrypt a message with a specific nonce (for testing)
 * 
 * @param sender_private_key 32-byte sender private key
 * @param recipient_public_key 32-byte recipient public key (x-only)
 * @param plaintext Message to encrypt
 * @param nonce 32-byte nonce
 * @param output Buffer for encrypted output (base64 encoded)
 * @param output_size Size of output buffer
 * @return NOSTR_SUCCESS on success, error code on failure
 */
int nostr_nip44_encrypt_with_nonce(const unsigned char* sender_private_key,
                                  const unsigned char* recipient_public_key,
                                  const char* plaintext,
                                  const unsigned char* nonce,
                                  char* output,
                                  size_t output_size);

/**
 * NIP-44: Decrypt a message using ECDH + ChaCha20 + HMAC
 * 
 * @param recipient_private_key 32-byte recipient private key
 * @param sender_public_key 32-byte sender public key (x-only)
 * @param encrypted_data Encrypted message (base64 encoded)
 * @param output Buffer for decrypted plaintext
 * @param output_size Size of output buffer
 * @return NOSTR_SUCCESS on success, error code on failure
 */
int nostr_nip44_decrypt(const unsigned char* recipient_private_key,
                       const unsigned char* sender_public_key,
                       const char* encrypted_data,
                       char* output,
                       size_t output_size);

#ifdef __cplusplus
}
#endif

#endif // NOSTR_NIP044_H