#pragma once

#include "pxl8_bsp.h"
#include "pxl8_math.h"
#include "pxl8_protocol.h"
#include "pxl8_types.h"
#include "pxl8_vxl.h"

#ifdef __cplusplus
extern "C" {
#endif

#define PXL8_SIM_FLAG_ALIVE    (1 << 0)
#define PXL8_SIM_FLAG_PLAYER   (1 << 1)
#define PXL8_SIM_FLAG_GROUNDED (1 << 2)

#define PXL8_SIM_MOVE_SPEED    180.0f
#define PXL8_SIM_GROUND_ACCEL  10.0f
#define PXL8_SIM_AIR_ACCEL     1.0f
#define PXL8_SIM_STOP_SPEED    100.0f
#define PXL8_SIM_FRICTION      6.0f
#define PXL8_SIM_GRAVITY       800.0f
#define PXL8_SIM_JUMP_VELOCITY 200.0f
#define PXL8_SIM_PLAYER_RADIUS 16.0f
#define PXL8_SIM_MAX_PITCH     1.5f

typedef struct pxl8_sim_entity {
    pxl8_vec3 pos;
    pxl8_vec3 vel;
    f32 yaw;
    f32 pitch;
    u32 flags;
    u16 kind;
    u16 _pad;
} pxl8_sim_entity;

typedef struct pxl8_sim_world {
    const pxl8_bsp* bsp;
    const pxl8_vxl_chunk* vxl;
    i32 vxl_cx, vxl_cy, vxl_cz;
} pxl8_sim_world;

bool pxl8_bsp_point_solid(const pxl8_bsp* bsp, pxl8_vec3 pos);
pxl8_vec3 pxl8_bsp_trace(const pxl8_bsp* bsp, pxl8_vec3 from, pxl8_vec3 to, f32 radius);

bool pxl8_vxl_point_solid(const pxl8_vxl_chunk* chunk, i32 cx, i32 cy, i32 cz, f32 x, f32 y, f32 z);
pxl8_vec3 pxl8_vxl_trace(const pxl8_vxl_chunk* chunk, i32 cx, i32 cy, i32 cz, pxl8_vec3 from, pxl8_vec3 to, f32 radius);

pxl8_vec3 pxl8_sim_trace(const pxl8_sim_world* world, pxl8_vec3 from, pxl8_vec3 to, f32 radius);
bool pxl8_sim_check_ground(const pxl8_sim_world* world, pxl8_vec3 pos, f32 radius);
void pxl8_sim_move_player(pxl8_sim_entity* ent, const pxl8_input_msg* input, const pxl8_sim_world* world, f32 dt);
void pxl8_sim_integrate(pxl8_sim_entity* ent, const pxl8_sim_world* world, f32 dt);

#ifdef __cplusplus
}
#endif