/* event.h - control-plane event bus, never called from byte-processing workers. */
#ifndef NAUT_EVENT_H
#define NAUT_EVENT_H

#include "naut/common.h"

typedef enum {
    NAUT_EVENT_TORRENT_ADDED,
    NAUT_EVENT_PIECE_COMPLETE,
    NAUT_EVENT_FILE_COMPLETE,
    NAUT_EVENT_TORRENT_FINISHED,
    NAUT_EVENT_PEER_CONNECTED,
    NAUT_EVENT_ALERT,
} naut_event_type;

typedef struct {
    naut_event_type type;
    uint64_t torrent_id;
    uint32_t index;
    const char *message;
    const char *path;
} naut_event;

typedef void (*naut_event_cb)(void *context, const naut_event *event);

typedef struct naut_event_bus naut_event_bus;

naut_event_bus *naut_event_bus_create(void);
void naut_event_bus_destroy(naut_event_bus *bus);

/* Subscribe/unsubscribe are control-thread operations. emit snapshots the
 * subscriber list, allowing callbacks to register work without holding a bus
 * lock. */
naut_err naut_event_subscribe(naut_event_bus *bus, naut_event_cb callback,
                              void *context, uint64_t *subscription_id);
void naut_event_unsubscribe(naut_event_bus *bus, uint64_t subscription_id);
void naut_event_emit(naut_event_bus *bus, const naut_event *event);

const char *naut_event_type_name(naut_event_type type);
bool naut_event_type_parse(const char *name, naut_event_type *type);

#endif /* NAUT_EVENT_H */