#ifndef YASL_LOOP_H
#define YASL_LOOP_H

#include "yasl/yasl.h"

#ifdef __cplusplus
extern "C" {
#endif

/* Optional event loop. Use the display's loop when adding application timers.
 * A step waits at most timeout_ms: zero polls, a negative value waits indefinitely.
 * Calls and callbacks use the loop's owning thread. */
YASL_API struct yasl_loop *yasl_loop_create(void);
YASL_API void yasl_loop_destroy(struct yasl_loop *l);
YASL_API int yasl_loop_run(struct yasl_loop *l);
YASL_API int yasl_loop_step(struct yasl_loop *l, int timeout_ms);
YASL_API void yasl_loop_quit(struct yasl_loop *l);
YASL_API void yasl_loop_kick(struct yasl_loop *l);
YASL_API uint64_t yasl_loop_now_ns(void);
YASL_API struct yasl_loop *yasl_display_loop(struct yasl_display *d);
YASL_API int yasl_loop_add_fd(struct yasl_loop *l, int fd, short events,
                             int (*fn)(int fd, short revents, void *ud), void *ud);
YASL_API int yasl_loop_del_fd(struct yasl_loop *l, int id);
YASL_API int yasl_loop_set_fd_events(struct yasl_loop *l, int id, short events);

/* Timers use nanoseconds. Return the next interval to repeat/reschedule, or zero
 * to remove the timer. A zero ID indicates failure. Loop timers live until they
 * stop, are deleted, or the loop is destroyed. Surface timers are also canceled
 * when their surface is destroyed. */
typedef uint32_t yasl_timer_id;
typedef uint64_t (*yasl_timer_cb)(void *ud, yasl_timer_id id, uint64_t interval_ns);

#define YASL_MS_TO_NS(ms) ((uint64_t)(ms) * 1000000ull)

YASL_API yasl_timer_id yasl_loop_add_timer(struct yasl_loop *l, uint64_t interval_ns,
                                          yasl_timer_cb cb, void *ud);
YASL_API bool yasl_loop_del_timer(struct yasl_loop *l, yasl_timer_id id);
YASL_API yasl_timer_id yasl_surface_add_timer(struct yasl_surface *s, uint64_t interval_ns,
                                             yasl_timer_cb cb, void *ud);
YASL_API bool yasl_surface_del_timer(struct yasl_surface *s, yasl_timer_id id);

#ifdef __cplusplus
}
#endif

#endif /* YASL_LOOP_H */