#ifndef RENDER_FIGURE_H
#define RENDER_FIGURE_H

/*
 * 2D painted people (see assets/shaders/figure.frag).
 *
 * The game poses a skeleton (people/body_pose.c); the renderer draws a smooth body
 * around it on a card facing the viewer.
 */

#include <stdbool.h>

#include "math/linalg.h"

typedef enum {
    HAIR_SHORT,
    HAIR_LONG,
} HairStyle;

typedef struct {
    Vec3      skin;
    Vec3      hair;
    Vec3      shirt;
    Vec3      pants;
    Vec3      shoes;
    float     height;        /* meters */
    HairStyle hair_style;
    bool      long_sleeves;
    int       garment;       /* GARMENT_*: what's on the legs */
    int       top;           /* TOP_*: the shirt on, or off (working in the sun), or a jacket over it (cold nights) */
    Vec3      jacket;        /* the jacket's colour */
    bool      jacket_tied;   /* the jacket off and along with them: tied round the waist by its sleeves */
    float     belly;         /* 0 .. 1: a belly (Kurti's) */
    bool      keeps_shirt;   /* never takes the shirt off, sun or no sun */
    float     wet;           /* 0 .. 1: clothes and hair wet from the rain (darker) */
    bool      hoodie;        /* the jacket has a hood ... */
    bool      hood_up;       /* ... pulled up over the head (rain) */
    int       hat;           /* HAT_*: on the head (off under a hood) ... */
    Vec3      hat_color;     /* ... its colour */
    int       cast;          /* a plaster cast: 0 none, 1 left forearm, 2 right forearm, 3 left shin, 4 right shin */
} FigureLook;

enum { TOP_SHIRT, TOP_BARE, TOP_CROP, TOP_JACKET };

/* A cap (a brim in front: the wind takes it easily) or a knitted beanie (stays on). */
enum { HAT_NONE, HAT_CAP, HAT_BEANIE };

/* Trousers (pants colour), shorts (knee-length), a skirt (pants colour) or a dress (shirt colour). */
enum { GARMENT_TROUSERS, GARMENT_SHORTS, GARMENT_SKIRT, GARMENT_DRESS };

/*
 * Joints in figure space: meters, origin between the feet on the ground,
 * x = figure's right, y = up, z = figure's forward.
 * Keep in sync with the J_* constants in figure.frag.
 */
typedef enum {
    JOINT_PELVIS, JOINT_CHEST, JOINT_NECK, JOINT_HEAD,
    JOINT_HIP_L, JOINT_KNEE_L, JOINT_ANKLE_L, JOINT_TOE_L,
    JOINT_HIP_R, JOINT_KNEE_R, JOINT_ANKLE_R, JOINT_TOE_R,
    JOINT_SHOULDER_L, JOINT_ELBOW_L, JOINT_WRIST_L, JOINT_HAND_L,
    JOINT_SHOULDER_R, JOINT_ELBOW_R, JOINT_WRIST_R, JOINT_HAND_R,
    JOINT_COUNT
} Joint;

/* Face paint, all 0..1 except brow and smile (-1..1). */
typedef struct {
    float mouth;      /* open */
    float eyelids;    /* closed */
    float brow;       /* -1 = inner ends up (shy, sad) .. 1 = raised */
    float smile;      /* -1 = frown .. 1 = smile */
    float gaze;       /* -1 = eyes down .. 1 = up */
} Face;

typedef struct {
    Vec3 joints[JOINT_COUNT];
    Vec3 head_forward;   /* where the face points (unit, figure space) */
    Vec3 head_up;        /* top of the head (unit) */
    Vec3 chest_forward;  /* front of the torso (unit) */
    Vec3 waist_bend;     /* the waist off the straight line from pelvis to chest: the back curves */
    Face face;
    /* A stream from the body to the ground: pee or sick (4 points of an arc) */
    Vec3 stream[4];
    int  stream_kind;    /* STREAM_NONE / STREAM_PEE / STREAM_VOMIT */
    float stream_width;  /* meters */
    Vec3  uri_a, uri_b;  /* a Urinella held to the body (figure space): the wide end, the spout ... */
    bool  uri;           /* ... shown */
    Vec3  cig_a, cig_tip; /* a cigarette (figure space): the end at the hand / lips, the burning end ... */
    float cig_glow;      /* ... how it glows (-1: no cigarette, 0: not lit .. 1: a drag) */
    float undress;       /* to pee: squatting trousers down / skirt up (0..1); standing fly open / skirt lifted in front (-1..0) */
    int   species;       /* FIGURE_PERSON, or FIGURE_DOG: the joints are her body (see people/dog.c) */
    Vec3  tail_a, tail_b; /* the dog's tail */
} Skeleton;

enum { FIGURE_PERSON, FIGURE_DOG };

enum { STREAM_NONE, STREAM_PEE, STREAM_VOMIT, STREAM_WATER };

typedef struct {
    Vec3       position;  /* feet, world space */
    Vec3       facing;    /* horizontal unit vector (figure's forward) */
    FigureLook look;
    Skeleton   skeleton;
} FigurePose;

/* A few painted outfits; any index works (wraps around). */
FigureLook Figure_wardrobe(int index);

/* Figure space <-> world space */
Vec3 Figure_toWorld(Vec3 position, Vec3 facing, Vec3 local);
Vec3 Figure_toLocal(Vec3 position, Vec3 facing, Vec3 world);

#endif /* RENDER_FIGURE_H */