#ifndef SIM_STEP_H
#define SIM_STEP_H

#include "rand.h"

struct space;
struct sim_snapshot;
struct sim_snapshot_list;

/* ========================== *
 * Sim accel
 * ========================== */

 /* Structure used to accelerate up entity lookup (rebuilt every step) */
 /* TODO: Remove this and do something better. Just a hack to de-couple old sim ctx from step. */

struct sim_accel {
    struct space *space;
};

struct sim_accel sim_accel_alloc(void);
void sim_accel_release(struct sim_accel *accel);
void sim_accel_reset(struct sim_snapshot *ss, struct sim_accel *accel);

/* ========================== *
 * Sim step
 * ========================== */

struct sim_step_ctx {
    b32 is_master;
    struct sim_accel *accel;
    struct rand_state rand;                 /* TODO: Replace with per-sim rand for deterministic rng */

    struct sim_snapshot *world;             /* The world to simulate */
    i64 sim_dt_ns;                          /* How much sim time should progress */

    struct sim_client *user_input_client;   /* The client that contains input from the user thread */
    struct sim_client *master_client;       /* The master client to read snapshots from (nil if world is master) */
    struct sim_client *publish_client;      /* The publish client to write syncable state to (nil if skipping publish) */
};

void sim_step(struct sim_step_ctx *ctx);

#endif