#ifndef __LIBNIMBUS_H__
#define __LIBNIMBUS_H__

#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

typedef struct {
  uint8_t* decoded;
  size_t decodedLen;
  uint8_t source[64]; /* TODO: change to ptr so they can be checked on nil? */
  uint8_t recipientPublicKey[64]; /* TODO: change to ptr so they can be checked on nil? */
  uint32_t timestamp;
  uint32_t ttl;
  uint8_t topic[4];
  double pow;
  uint8_t hash[32];
} received_message;

typedef struct {
  const char* symKeyID;
  const char* privateKeyID;
  uint8_t* source; /* 64 bytes public key */
  double minPow;
  uint8_t topic[4];
  int allowP2P;
} filter_options;

typedef struct {
  const char* symKeyID; /* Identifier for symmetric key, set to nil if none */
  uint8_t* pubKey; /* 64 bytes public key, set to nil if none */
  const char* sourceID; /* Identifier for asymmetric key, set to nil if none */
  uint32_t ttl;
  uint8_t topic[4]; /* default of 0 is OK */
  uint8_t* payload; /* payload to be send, can be len=0 but can not be nil */
  size_t payloadLen;
  uint8_t* padding; /* custom padding, can be set to nil */
  size_t paddingLen;
  double powTime;
  double powTarget;
} post_message;

typedef struct {
  uint8_t topic[4];
} topic;

typedef void (*received_msg_handler)(received_message* msg, void* udata);

/** Initialize Nim and the Status library. Must be called before anything else
 * of the API. Also, all following calls must come from the same thread as from
 * which this call was done.
 */
void NimMain();

/** Start Ethereum node with Whisper capability and connect to Status fleet.
 * Optionally start discovery and listen for incoming connections.
 * The minPow value is the minimum required PoW that this node will allow.
 * When privkey is null, a new keypair will be generated.
 */
bool nimbus_start(uint16_t port, bool startListening, bool enableDiscovery,
  double minPow, uint8_t* privkey);

/** Add peers to connect to - must be called after nimbus_start */
void nimbus_add_peer(const char* nodeId);

/**
 * Should be called in regularly - for example in a busy loop (beautiful!) on
 * dedicated thread.
 */
void nimbus_poll();

/** Asymmetric Keys API */

/** It is important that caller makes a copy of the returned strings before
 * doing any other API calls. */
const char* nimbus_new_keypair();
const char* nimbus_add_keypair(const uint8_t* privkey);
bool nimbus_delete_keypair(const char* id);
bool nimbus_get_private_key(const char* id, uint8_t* privkey);

/** Symmetric Keys API */

/** It is important that caller makes a copy of the returned strings before
 * doing any other API calls. */
const char* nimbus_add_symkey(const uint8_t* symkey);
const char* nimbus_add_symkey_from_password(const char* password);
bool nimbus_delete_symkey(const char* id);
bool nimbus_get_symkey(const char* id, uint8_t* symkey);

/** Whisper message posting and receiving API */

/** Subscribe to given filter. The void pointer udata will be passed to the
 * received_msg_handler callback.
 */
const char* nimbus_subscribe_filter(filter_options* filter_options,
  received_msg_handler msg, void* udata);
bool nimbus_unsubscribe_filter(const char* id);
/* Post Whisper message to the queue */
bool nimbus_post(post_message* msg);

/** TODO: why are following two getters needed? */

/** Get the minimum required PoW of this node */
double nimbus_get_min_pow();

/** Get the currently set bloom filter of this node. This will automatically
 *update for each filter subsribed to.
 */
void nimbus_get_bloom_filter(uint8_t* bloomfilter);

/** Example helper, can be removed */
topic nimbus_channel_to_topic(const char* channel);

/** Very limited Status chat API */
void nimbus_post_public(const char* channel, const char* payload);
void nimbus_join_public_chat(const char* channel, received_msg_handler msg);

#ifdef __cplusplus
}
#endif

#endif //__LIBNIMBUS_H__