const sharp = require('sharp');
const p = 'data/media/assets/e6/e64a43a218fa7471fb0713652d383736757a81c004ced24c920b142d265acf58.png';
const pts = {
  podloga_wnetrze_1: [1200, 700],
  podloga_wnetrze_2: [900, 900],
  podloga_wnetrze_3: [1400, 550],
  sciana_wnetrze:    [1000, 480],
  pas_przedni_tk:    [1200, 1250],
  siedzisko_spod_tk: [700, 400],
  listwa_drewno:     [520, 1000],
  podlokietnik_tk:   [1750, 850],
  siedzisko_prawe_tk:[2050, 1300],
  tlo_studio:        [200, 1600],
};
function rgbToLab(r,g,b){
  const lin=c=>{c/=255;return c<=0.04045?c/12.92:Math.pow((c+0.055)/1.055,2.4)};
  const rl=lin(r),gl=lin(g),bl=lin(b);
  const x=(rl*0.4124564+gl*0.3575761+bl*0.1804375)/0.95047;
  const y=rl*0.2126729+gl*0.7151522+bl*0.072175;
  const z=(rl*0.0193339+gl*0.119192+bl*0.9503041)/1.08883;
  const f=t=>t>0.008856?Math.cbrt(t):7.787*t+16/116;
  const fx=f(x),fy=f(y),fz=f(z);
  return [116*fy-16,500*(fx-fy),200*(fy-fz)];
}
(async()=>{
  const img = sharp(p).removeAlpha();
  for (const [name,[x,y]] of Object.entries(pts)) {
    const raw = await img.clone().extract({left:Math.max(0,x-5),top:Math.max(0,y-5),width:11,height:11}).raw().toBuffer();
    let r=0,g=0,b=0,n=0;
    for (let i=0;i<raw.length;i+=3){r+=raw[i];g+=raw[i+1];b+=raw[i+2];n++;}
    r=Math.round(r/n);g=Math.round(g/n);b=Math.round(b/n);
    const [L,A,B] = rgbToLab(r,g,b).map(v=>v.toFixed(1));
    console.log(name.padEnd(20), `rgb(${r},${g},${b})`.padEnd(20), `LAB(${L}, ${A}, ${B})`);
  }
})();