#ifndef SIM_H
#define SIM_H

#include "host.h"

struct world;
struct mixer_startup_receipt;
struct sprite_startup_receipt;
struct sound_startup_receipt;
struct phys_startup_receipt;
struct host_startup_receipt;

/* Absolute layers */
#define SIM_LAYER_FLOOR_DECALS         -300
#define SIM_LAYER_BULLETS              -200
#define SIM_LAYER_TRACERS              -100
#define SIM_LAYER_SHOULDERS            0

/* Relative layers */
#define SIM_LAYER_RELATIVE_DEFAULT     0
#define SIM_LAYER_RELATIVE_WEAPON      1

struct sim_startup_receipt { i32 _; };
struct sim_startup_receipt sim_startup(struct mixer_startup_receipt *mixer_sr,
                                         struct sprite_startup_receipt *sheet_sr,
                                         struct sound_startup_receipt *sound_sr,
                                         struct phys_startup_receipt *phys_sr,
                                         struct host_startup_receipt *host_sr);


/* ========================== *
 * Sim cmd
 * ========================== */

enum sim_cmd_state {
    SIM_CMD_STATE_STOP = -1,
    SIM_CMD_STATE_NO_CHANGE = 0,
    SIM_CMD_STATE_START = 1
};

enum sim_cmd_kind {
    SIM_CMD_KIND_NONE,

    SIM_CMD_KIND_PLAYER_MOVE,
    SIM_CMD_KIND_PLAYER_FIRE,

    SIM_CMD_KIND_SIM_CLIENT_CONNECT,
    SIM_CMD_KIND_SIM_CLIENT_DISCONNECT,

    /* Testing */
    SIM_CMD_KIND_CLEAR_ALL,
    SIM_CMD_KIND_SPAWN_TEST,
    SIM_CMD_KIND_PAUSE,
    SIM_CMD_KIND_STEP,
    SIM_CMD_KIND_DRAG_OBJECT,
    SIM_CMD_KIND_CURSOR_MOVE,

    SIM_CMD_KIND_COUNT
};

struct sim_cmd {
    enum sim_cmd_kind kind;
    enum sim_cmd_state state;
    struct host_channel_id channel_id;

    /* SIM_CMD_KIND_PLAYER_MOVE */
    struct v2 move_dir;
    struct v2 aim_dir;

    /* SIM_CMD_KIND_CURSOR_MOVE */
    struct v2 cursor_pos;

    /* SIM_CMD_KIND_PLAYER_DISCONNECT */
    struct string disconnect_reason;

#if RTC
    u32 collider_gjk_steps;
#endif

    struct sim_cmd *next;
};

struct sim_cmd_list {
    struct sim_cmd *first;
    struct sim_cmd *last;
};

struct string sim_string_from_cmds(struct arena *arena, struct sim_cmd_list cmds);
void sim_cmds_from_host_events(struct arena *arena, struct host_event_array host_events, struct sim_cmd_list *cmds_out);

/* ========================== *
 * Sim event
 * ========================== */

enum sim_event_kind {
    SIM_EVENT_KIND_NONE,

    SIM_EVENT_KIND_CONNECT,
    SIM_EVENT_KIND_DISCONNECT,
    SIM_EVENT_KIND_SNAPSHOT_FULL,

    //SIM_EVENT_KIND_ENTITY_UPDATE,
    //SIM_EVENT_KIND_ENTITY_CREATE,
    //SIM_EVENT_KIND_ENTITY_DESTROY
};

struct sim_event {
    enum sim_event_kind kind;
    struct host_channel_id channel_id;

    struct string snapshot_data;
    struct string disconnect_reason;

    //struct sim_ent_handle entity;
    //struct string update_data;

    struct sim_event *next;
};

struct sim_event_list {
    struct sim_event *first;
    struct sim_event *last;
};

struct string sim_string_from_events(struct arena *arena, struct sim_event_list events);
void sim_events_from_host_events(struct arena *arena, struct host_event_array host_events, struct sim_event_list *events_out);

/* ========================== *
 * Snapshot
 * ========================== */

struct string sim_string_from_tick(struct arena *arena, struct world *tick);
void sim_tick_from_string(struct string str, struct world *tick_out);

#endif