#include <U8g2lib.h>
#include <SPI.h>
#include <math.h>

#define CS 5
#define DC 16
#define RESET 17

U8G2_SSD1309_128X64_NONAME0_F_4W_HW_SPI u8g2(U8G2_R2, CS, DC, RESET);

// Yeux ronds formés de 10 barres horizontales, la 4e depuis le haut supprimée
const int EYE_R     = 29;   // rayon du cercle
const int BAR_THICK = 5;    // épaisseur
const int BAR_PITCH = 6;    // espacement centre-à-centre
const int BAR_ROUND = 2;    // rayon coin arrondi des barres
const int N_BARS    = 10;
const int SKIP_BAR  = 3;    // 4e en partant du haut (index 0 = top)
const int OVER_BAR  = 2;    // 3e en partant du haut, redessinée par-dessus la pupille

const int EYE_L_CX = 32;
const int EYE_R_CX = 96;
const int EYE_CY   = 32;

const int PUPIL_R  = 11;
const int PUPIL_DY = -3;

void drawEye(int cx, int cy) {
  for (int i = 0; i < N_BARS; i++) {
    if (i == SKIP_BAR) continue;
    // offset vertical centré autour de cy (10 barres symétriques)
    float off = (i - (N_BARS - 1) / 2.0f) * BAR_PITCH;
    int dy = (int)roundf(off);
    int dy2 = dy * dy;
    int r2 = EYE_R * EYE_R;
    if (dy2 >= r2) continue;
    int halfW = (int)sqrtf((float)(r2 - dy2));
    int topY = cy + dy - BAR_THICK / 2;
    int w = 2 * halfW + 1;
    // garde-fou pour drawRBox (w et h doivent être > 2*r)
    if (w > 2 * BAR_ROUND && BAR_THICK > 2 * BAR_ROUND) {
      u8g2.drawRBox(cx - halfW, topY, w, BAR_THICK, BAR_ROUND);
    } else {
      u8g2.drawBox(cx - halfW, topY, w, BAR_THICK);
    }
  }

  // pupille : disque sombre creusé
  u8g2.setDrawColor(0);
  u8g2.drawDisc(cx, cy + PUPIL_DY, PUPIL_R);
  u8g2.setDrawColor(1);

  // redessine le 3e trait par-dessus la pupille
  {
    float off = (OVER_BAR - (N_BARS - 1) / 2.0f) * BAR_PITCH;
    int dy = (int)roundf(off);
    int dy2 = dy * dy;
    int r2 = EYE_R * EYE_R;
    if (dy2 < r2) {
      int halfW = (int)sqrtf((float)(r2 - dy2));
      int topY = cy + dy - BAR_THICK / 2;
      int w = 2 * halfW + 1;
      if (w > 2 * BAR_ROUND && BAR_THICK > 2 * BAR_ROUND) {
        u8g2.drawRBox(cx - halfW, topY, w, BAR_THICK, BAR_ROUND);
      } else {
        u8g2.drawBox(cx - halfW, topY, w, BAR_THICK);
      }
    }
  }
}

void setup() {
  u8g2.begin();
  u8g2.clearBuffer();
  drawEye(EYE_L_CX, EYE_CY);
  drawEye(EYE_R_CX, EYE_CY);
  u8g2.sendBuffer();
}

void loop() {
  // image statique
}