#pragma once

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

#include "list.h"

#define OWD_EVENT_READABLE (1 << 0)
#define OWD_EVENT_WRITABLE (1 << 1)

enum owd_event_source {
  OWD_EVENT_SOURCE_FD,
  OWD_EVENT_SOURCE_TIMER,
};

typedef struct {
  uintptr_t obj;
  enum owd_event_source source;
} owd_event_id_t;

struct owd_event {
  owd_event_id_t id;
  struct intrusive_list list;
  
  uintptr_t kqueue_ident;
  short kqueue_filter;
};

struct owd_eventloop {
  struct intrusive_list event_list;

  uintptr_t kqueue_timer_next;
  int kqueue_fd;
};

static inline bool owd_event_id_eq(owd_event_id_t eid1, owd_event_id_t eid2) {
  return (eid1.obj == eid2.obj) && (eid1.source == eid2.source);
}

int owd_eventloop_init(struct owd_eventloop *el);
void owd_eventloop_cleanup(struct owd_eventloop *el);

int owd_eventloop_wait(struct owd_eventloop *el, owd_event_id_t *id_out, const struct timespec *timeout);
int owd_eventloop_clear(struct owd_eventloop *el, struct owd_event *e);
void owd_eventloop_remove(struct owd_eventloop *el, struct owd_event *e);
int owd_eventloop_add_timer(struct owd_eventloop *el, struct owd_event *e, uint64_t millis, bool oneshot);