#pragma once

#include <al/types.h>
#include <al/atomic.h>

// Synced:
// () = other clients only
//  Pause:
//   - User input -> start fade and request pause from server
//   - Get response -> (start fade) arm pause or reseek if late
//  Resume:
//   - User input -> request resume from server
//   - Get response -> arm resume, apply offset to queued
//  Next/Prev:
//   - User input -> start fade request next from server
//   - Get response -> (start fade) arm pause, arm resume on next, then swap on pause
//
// Local:
//  Pause:
//   - User input -> start fade and pause immediately
//  Reumse:
//   - User input -> resume and fade in
//  Next/Prev:
//   - User input -> swap

// Values that PTS can never normally be.
#define CAMU_PTS_PAUSED 0x1.fffffffffffffp+1023
#define CAMU_PTS_SIGNAL_PAUSE 0x1.fffffffffffffp+1022
#define CAMU_PTS_UNSET 0x1.fffffffffffffp+1021
#define CAMU_PTS_CONSIDER_PAUSED(pts) (pts == CAMU_PTS_PAUSED || pts == CAMU_PTS_SIGNAL_PAUSE || pts == CAMU_PTS_UNSET)

enum {
    CAMU_CLOCK_PAUSED = 0
};

enum {
    CAMU_CLOCK_PAUSE_FOR_SWAP = 1,
    CAMU_CLOCK_EXTERNAL_PAUSE = 1 << 1,
    CAMU_CLOCK_NO_SIGNAL_PAUSE = 1 << 7
};

struct camu_clock {
    f64 base;
    f64 offset;
    atomic(f64) tick;
    atomic(f64) pause;
    f64 paused_at;
    atomic(bool) pause_for_swap;
    atomic(bool) external_pause;
    atomic(f64) last_pts;
    void (*callback)(void *, u8);
    void *userdata;
};

void camu_clock_init(struct camu_clock *clock, void (*callback)(void *, u8), void *userdata);
void camu_clock_set(struct camu_clock *clock, f64 base);
void camu_clock_offset(struct camu_clock *clock, f64 offset);

void camu_clock_seek(struct camu_clock *clock, f64 base, u64 target);

bool camu_clock_pause(struct camu_clock *clock, u64 target);
void camu_clock_set_pause_for_swap(struct camu_clock *clock);
void camu_clock_set_external_pause(struct camu_clock *clock);
void camu_clock_resume(struct camu_clock *clock, u64 target);

f64 camu_clock_get_base_pts(struct camu_clock *clock);
f64 camu_clock_get_pts(struct camu_clock *clock, f64 latency, bool allow_set, u8 *status);
f64 camu_clock_get_last_pts(struct camu_clock *clock);