#ifndef STATE_H
#define STATE_H

#include "twn_game_api.h"


#define POINTS_PER_METER 128
#define UNDO_STACK_SIZE 32
#define CAMERA_FOV ((float)M_PI_2 * 0.75f)

#define POINT_LIMIT 65534
#define FACE_LIMIT 2048
#define OBJECT_LIMIT 16
#define TEXTURE_LIMIT 32

#define INVALID_POINT (POINT_LIMIT+1)
#define INVALID_FACE (FACE_LIMIT+1)
#define INVALID_OBJECT (OBJECT_LIMIT+1)
#define INVALID_TEXTURE (TEXTURE_LIMIT+1)

#define CAMERA_ROTATION_SPEED 0.04f
#define SELECTION_SPHERE_RADIUS 32

typedef struct Operation {
    enum {
        OPERATION_MOVE_POINT,
    } kind;
    union {
        struct {
            uint16_t id;
            int16_t delta_x;
            int16_t delta_y;
        } move_point;
    } data;
} Operation;

typedef struct Point {
    int16_t x, y, z;
} Point;

/* triangles have p3 = INVALID_POINT */
/* lines have p2, p3 = INVALID_POINT */
/* points have p1, p2, p3 = INVALID_POINT */
typedef struct Face {
    uint16_t p[4];
    uint8_t texture;
} Face;

typedef struct Object {
    char *name;
    bool is_invisible;
    Point position;
    char *textures[TEXTURE_LIMIT];
    uint8_t textures_sz;
    Point rotation;
    Face faces[FACE_LIMIT];
    uint16_t faces_sz;
} Object;

typedef struct State {
    Operation undo_stack[UNDO_STACK_SIZE];
    uint32_t undo_stack_ptr;

    Vec3 camera_position;
    Vec3 camera_direction;
    float camera_zoom;
    bool camera_is_orthographic;
    /* defaults to wireframe */
    bool solid_display_mode;
    /* positions skipped */
    uint8_t grid_snap_granularity;

    Point points[POINT_LIMIT];
    uint16_t points_sz;

    Object *objects;
    uint8_t objects_sz;
} State;


#endif