#pragma once

#ifdef __cplusplus
extern "C"
{
#endif

struct mq_schema;
struct mq_schema *mq_schema_new();
void mq_schema_free(struct mq_schema *s);

struct mq_runtime;
struct mq_runtime *mq_runtime_new(struct mq_schema *s);
void mq_runtime_free(struct mq_runtime *s);

typedef void mq_msg_free_cb_func(void *msg, void *msg_free_arg);
typedef void on_msg_cb_func(int topic_id, const void *msg, void *on_msg_arg);
typedef void on_msg_dispatch_cb_func(int topic_id, 
									 const void *msg, 
									 on_msg_cb_func* on_msg_cb, 
									 void *on_msg_cb_arg, 
									 void *dispatch_arg);

//return topic_id
int mq_schema_create_topic(struct mq_schema *s, 
						   const char *topic_name, 
						   on_msg_dispatch_cb_func *on_dispatch_cb, 
						   void *on_dispatch_arg, 
						   mq_msg_free_cb_func *msg_free_cb, 
						   void *msg_free_arg);

int mq_schema_get_topic_id(struct mq_schema *s, const char *topic_name);

int mq_schema_update_topic(struct mq_schema *s, 
						   int topic_id, 
						   on_msg_dispatch_cb_func *on_dispatch_cb, 
						   void *on_dispatch_arg, 
						   mq_msg_free_cb_func *msg_free_cb, 
						   void *msg_free_arg);

int mq_schema_destroy_topic(struct mq_schema *s, int topic_id);

//return 0 if success, otherwise return -1.
int mq_schema_subscribe(struct mq_schema *s, int topic_id, on_msg_cb_func *on_msg_cb, void * on_msg_cb_arg); 


int mq_runtime_publish_message(struct mq_runtime *rt, int topic_id, void *msg);
void mq_runtime_dispatch(struct mq_runtime *rt);

#ifdef __cplusplus
}
#endif