// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.

#pragma once

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

#include "list.h"
#include "scoped.h"

#define TLSL_EVENT_READABLE (1 << 0)
#define TLSL_EVENT_WRITABLE (1 << 1)

enum tlsl_event_source {
  TLSL_EVENT_SOURCE_FD,
  TLSL_EVENT_SOURCE_TIMER,
};

typedef struct {
  uintptr_t obj;
  enum tlsl_event_source source;
} tlsl_event_id_t;

struct tlsl_event {
  tlsl_event_id_t id;
  struct intrusive_list list;
  char _platform[16] __attribute__((aligned));
};

struct tlsl_eventloop {
  struct intrusive_list event_list;
  bool valid;
  char _platform[16] __attribute__((aligned));
};

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

int tlsl_eventloop_init(struct tlsl_eventloop *el);
void tlsl_eventloop_cleanup(struct tlsl_eventloop *el);

int tlsl_eventloop_wait(struct tlsl_eventloop *el, tlsl_event_id_t *id_out, uint32_t *flags_out, int timeout_ms);
int tlsl_eventloop_clear(struct tlsl_eventloop *el, struct tlsl_event *e);
void tlsl_eventloop_remove(struct tlsl_eventloop *el, struct tlsl_event *e);
int tlsl_eventloop_add_timer(struct tlsl_eventloop *el, struct tlsl_event *e, uint64_t millis, bool oneshot);
int tlsl_eventloop_add_fd(struct tlsl_eventloop *el, struct tlsl_event *e, int fd, uint32_t flags);

DEF_SCOPED_TYPE(eventloop_stack, struct tlsl_eventloop, (struct tlsl_eventloop) { .valid = false }, tlsl_eventloop_cleanup)

#define EVENTLOOP_STACK_SCOPED(VAL) SCOPED(eventloop_stack, struct tlsl_eventloop, VAL)
#define EVENTLOOP_STACK_CLOSE(EL)   _scoped_eventloop_stack_cleanup(EL)