#pragma once

#include "demo3d_bsp.h"
#include "pxl8_math.h"
#include "demo3d_protocol.h"
#include "pxl8_types.h"

#ifdef __cplusplus
extern "C" {
#endif

#define DEMO3D_SIM_FLAG_ALIVE    (1 << 0)
#define DEMO3D_SIM_FLAG_PLAYER   (1 << 1)
#define DEMO3D_SIM_FLAG_GROUNDED (1 << 2)

typedef struct demo3d_sim_config {
    f32 move_speed;
    f32 ground_accel;
    f32 air_accel;
    f32 stop_speed;
    f32 friction;
    f32 gravity;
    f32 jump_velocity;
    f32 player_radius;
    f32 player_height;
    f32 max_pitch;
} demo3d_sim_config;

typedef struct demo3d_sim_entity {
    pxl8_vec3 pos;
    pxl8_vec3 vel;
    f32 yaw;
    f32 pitch;
    u32 flags;
    u16 kind;
    u16 _pad;
} demo3d_sim_entity;

typedef struct demo3d_sim_world {
    const demo3d_bsp* chunks[9];
    i32 center_cx;
    i32 center_cz;
    f32 chunk_size;
} demo3d_sim_world;

bool demo3d_bsp_point_solid(const demo3d_bsp* bsp, pxl8_vec3 pos);
pxl8_vec3 demo3d_bsp_trace(const demo3d_bsp* bsp, pxl8_vec3 from, pxl8_vec3 to, f32 radius);

pxl8_vec3 demo3d_sim_trace(const demo3d_sim_world* world, pxl8_vec3 from, pxl8_vec3 to, f32 radius, f32 height);
bool demo3d_sim_check_ground(const demo3d_sim_world* world, pxl8_vec3 pos, f32 radius);
void demo3d_sim_move_player(demo3d_sim_entity* ent, const demo3d_input_msg* input, const demo3d_sim_world* world, const demo3d_sim_config* cfg, f32 dt);
void demo3d_sim_integrate(demo3d_sim_entity* ent, const demo3d_sim_world* world, const demo3d_sim_config* cfg, f32 dt);

#ifdef __cplusplus
}
#endif