let scrollId = Math.floor(Date.now()/1000/60/60);
let scrollPerLoop = 2000;
let mtx = 0.5;
let mty = 0.5;
let mta = 205.0/360.0;
let mtr = 1.0;
let maxScale = 16;
let sensScale = 0.4;
let sensTouch = 100;
let alpha = 10;
let nDecimals = 4;
let touchTip = true;
let sDegree = 3;
let lValue = 0.5;

let r = 0.45;
let sw = r/2;

let sensMouv = 0.1;

let clientX;
let clientY;

let nLayers = 10;

const thit = document.getElementById("thit");
const stringToConvert = thit.innerText;

const myLogo = document.getElementById("myLogo");
const pathGroup = document.getElementById("pathGroup");
const maskGroup = document.getElementById("maskGroup");
const gradientsGroup = document.getElementById("gradients");

const tips = document.getElementById("tips");

const easeOut = document.getElementById("easeOut");
const easeOutValue = document.getElementById("easeOutValue");
const light = document.getElementById("light");
const lightValue = document.getElementById("lightValue");

function ready(fn) {
  if (document.readyState !== 'loading') {
    fn();
  } else {
    document.addEventListener('DOMContentLoaded', fn);
  }
}

function easeInNone(x) {
return x;
}

function easeOutNone(x) {
return x;
}

function easeInQuad(x) {
return x * x;
}

function easeInCubic(x) {
return x * x * x;
}

function easeOutSine(x) {
  return Math.sin((x * Math.PI) / 2);
}

function easeInSpline(x,d) {
return Math.pow(x, d);
}

function easeOutSpline(x,d) {
return 1 - Math.pow(1 - x, d);
}

function easeInCirc(x) {
return 1 - Math.sqrt(1 - Math.pow(x, 2));
}

function easeOutCirc(x) {
return Math.sqrt(1 - Math.pow(x - 1, 2));
}

function easeOutExpo(x) {
return x === 1 ? 1 : 1 - Math.pow(2, -10 * x);
}

function easeInOutCirc(x) {
return x < 0.5
  ? (1 - Math.sqrt(1 - Math.pow(2 * x, 2))) / 2
  : (Math.sqrt(1 - Math.pow(-2 * x + 2, 2)) + 1) / 2;

}

function easeInSine(x) {
  return 1 - Math.cos((x * Math.PI) / 2);

}

function easeOutCubic(x) {
return 1 - Math.pow(1 - x, 3);
}

function easeInOutQuad(x) {
return x < 0.5 ? 2 * x * x : 1 - Math.pow(-2 * x + 2, 2) / 2;

}

function easeInOutSine(x) {
return -(Math.cos(Math.PI * x) - 1) / 2;
}

function easeInOutCubic(x) {
return x < 0.5 ? 4 * x * x * x : 1 - Math.pow(-2 * x + 2, 3) / 2;

}

function triangleWave(x, amplitude, period, offset) {
  let normalized = ((x+period/2) * (2 / period)) % 2;
  let wave = Math.abs(normalized - 1);
  return (wave * amplitude) + offset;
}

function dpathO() {
  let d = `M ${(r).toFixed(nDecimals)} 0 V ${(r).toFixed(nDecimals)} A ${r.toFixed(nDecimals)} ${r.toFixed(nDecimals)} 0 0 1 ${(-r).toFixed(nDecimals)} ${(r).toFixed(nDecimals)} V ${(-r).toFixed(nDecimals)} A ${r.toFixed(nDecimals)} ${r.toFixed(nDecimals)} 0 0 1 ${(r).toFixed(nDecimals)} ${(-r).toFixed(nDecimals)} Z`;
  return d;
}

function dpathM() {
  let d = 'M -100 100 L 100 -100';
  return d;
}

function drawLayer(i) {

  let si = (scrollId%scrollPerLoop)/(scrollPerLoop-1);

  let scale = (nLayers - i - si)/nLayers;

  let rate = triangleWave((nLayers - i - si)/(nLayers-1),1,1,0.0);
  if (i == 0) {
    rate = 0;
  }
  // increase = easeInSine(increase);
  // rate = easeInOutSine(rate);

  let myLayer = document.getElementById(`layer${i}`);

  let myGrad = document.getElementById(`grad${i}`);
  myGrad.innerHTML = `<stop offset="0.1" stop-color="black" /><stop offset="${0.5-0.3*scale}" stop-color="${hslToHex(205.0/360.0,1,lValue*rate)}" /><stop offset="${0.5+0.3*scale}" stop-color="${hslToHex(205.0/360.0,1,lValue*rate)}" /><stop offset="0.9" stop-color="black" />`;
  // myGrad.setAttribute('gradientTransform', ` translate (0.5 0.5) scale(${scale}) translate (-0.5 -0.5)`);

  let o = document.getElementById(`o${i}`);
  let mo = document.getElementById(`mo${i}`);

  o.setAttribute('transform', `scale(${scale})`);
  mo.setAttribute('transform', `scale(${scale})`);
  myLayer.setAttribute('fill', `url(#grad${i})`);

}

function svgChar(i,c) {
  let mySvg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
  // mySvg.setAttribute('width','128px');
  // mySvg.setAttribute('height','128px');
  mySvg.setAttribute('viewBox','-0.5 -0.5 1 1');
  mySvg.setAttribute('version','1.1');
  mySvg.setAttribute('id',`svg${i}`);
  mySvg.setAttribute('xmlns','http://www.w3.org/2000/svg');
  mySvg.setAttribute('xmlns:svg','http://www.w3.org/2000/svg');
  mySvg.setAttribute('height','100px');
  mySvg.setAttribute('width','100px');
  let myChar = document.createElementNS('http://www.w3.org/2000/svg', 'text');
  myChar.setAttribute('x','0');
  myChar.setAttribute('y','0');
  myChar.setAttribute('fill','none');
  myChar.setAttribute('id',`text${i}`);
  myChar.setAttribute('text-anchor','middle');
  myChar.setAttribute('dominant-baseline','middle');
  let myText = document.createTextNode(c);
  myChar.appendChild(myText);
  mySvg.appendChild(myChar);
  thit.appendChild(mySvg);
}

function doThit() {
  console.log(stringToConvert);
  thit.innerHTML = '';
  for (let i = 0; i < stringToConvert.length; i++) {
    svgChar(i,stringToConvert.charAt(i));
  }
}

function doThas() {
  for (let i = 0; i < stringToConvert.length; i++) {
    cutOutChar(i);

  }
}

function cutOutChar(i) {
  let mySvg = document.getElementById(`svg${i}`);
  let myChar = document.getElementById(`text${i}`);
  let myBBox = myChar.getBBox();
  let myRect = document.createElementNS('http://www.w3.org/2000/svg', 'rect');
  myRect.setAttribute('x',-1);
  myRect.setAttribute('y',-1);
  myRect.setAttribute('width',2);
  myRect.setAttribute('height',2);
  // myRect.setAttribute('x',myBBox.x);
  // myRect.setAttribute('y',myBBox.y);
  // myRect.setAttribute('width',myBBox.width);
  // myRect.setAttribute('height',myBBox.height);
  myRect.setAttribute('fill','#404040');
  let myRect2 = myRect.cloneNode();
  myRect.setAttribute('mask',`url(#mask${i})`);
  myRect2.setAttribute('fill','white');
  let myMask = document.createElementNS('http://www.w3.org/2000/svg', 'mask');
  myMask.setAttribute('id',`mask${i}`);
  myMask.setAttribute('mask-type','luminance');
  mySvg.innerHTML = '';
  myChar.setAttribute('fill','black');
  let myOutline = myChar.cloneNode(true);
  myOutline.setAttribute('fill','none');
  myOutline.setAttribute('stroke','black');
  myOutline.setAttribute('stroke-width','0.005');
  let myGroup = document.createElementNS('http://www.w3.org/2000/svg', 'g');
  myMask.appendChild(myRect2);
  myMask.appendChild(myChar);
  myGroup.appendChild(myMask);
  myGroup.appendChild(myRect);
  myGroup.appendChild(myOutline);


  for (let j = nLayers-1; j > 0; j--) {
    let couleur = (j+1)/nLayers*1/5;
    let ratio = 1-(j)/nLayers;
    let myClone = myGroup.cloneNode(true);
    myClone.firstChild.setAttribute('id',`mask${i}_${j}`);
    myClone.childNodes[1].setAttribute('mask',`url(#mask${i}_${j})`);
    myClone.childNodes[1].setAttribute('fill',`${hslToHex(couleur,1,0.5)}`);
    myClone.setAttribute('transform',`translate(0 ${-(j+1)*0.0035}) scale(${ratio})`);
    mySvg.appendChild(myClone);
  }

  mySvg.appendChild(myGroup);

}

function addLayers() {
  for (let i = 0; i < nLayers; i++) {
    let e = document.createElement("linearGradient");
    e.setAttribute('id', `grad${i}`);
    e.setAttribute('x1','0');
    e.setAttribute('y1', '0');
    e.setAttribute('x2', '1');
    e.setAttribute('y2', '0');
    // let e = document.createElement("radialGradient");
    // e.setAttribute('cx', '50%');
    // e.setAttribute('id', `grad${i}`);
    // e.setAttribute('cy','50%');
    // e.setAttribute('r', '50%');
    // e.setAttribute('fx', '50%');
    // e.setAttribute('fy', '50%');
    gradientsGroup.appendChild(e);
  }
  for (let i = nLayers - 1; i >= 0; i--) {
    let g = document.createElement("g");
    g.setAttribute('id', `group${i}`);
    g.setAttribute('shape-rendering','geometricPrecision')
    let r = document.createElement("rect");
    r.setAttribute('id', `rect${i}`);
    r.setAttribute('x',-1);
    r.setAttribute('y',-1);
    r.setAttribute('width',2);
    r.setAttribute('height',2);
    r.setAttribute('fill',"white");
    let o = document.createElement("path");
    o.setAttribute('id', `o${i}`);
    o.setAttribute('d',dpathO());
    o.setAttribute('fill',"black");
    let mo = document.createElement("path");
    mo.setAttribute('id', `mo${i}`);
    mo.setAttribute('d',dpathM());
    mo.setAttribute('stroke',"black");
    mo.setAttribute('stroke-width',`${sw}`);

    // e.setAttribute('mask', `url(#mask${i})`);
    let m = document.createElement("mask");
    m.setAttribute('id', `mask${i}`);
    m.appendChild(r);
    m.appendChild(o);
    m.appendChild(mo);
    g.appendChild(m);

    let l = document.createElement("rect");
    l.setAttribute('id', `layer${i}`);
    l.setAttribute('x',-1);
    l.setAttribute('y',-1);
    l.setAttribute('width',2);
    l.setAttribute('height',2);
    l.setAttribute('mask',`url(#mask${i})`);
    g.appendChild(l);
    myLogo.appendChild(g);
  }
  myLogo.innerHTML += '';
  redrawLayers();
}

function redrawLayers() {
  mta = Math.atan2(-0.5+mty,-0.5+mtx)/(2*Math.PI)+0.5;
  mtr = Math.min(2* Math.sqrt(Math.pow(-0.5+mty,2)+Math.pow(-0.5+mtx,2)),1);
  for (let i = 0; i < nLayers; i++) {
    drawLayer(i);
  }
}

function componentToHex(c) {
  var hex = c.toString(16);
  return hex.length == 1 ? "0" + hex : hex;
}

function rgbToHex(r, g, b) {
  return "#" + componentToHex(r) + componentToHex(g) + componentToHex(b);
}

function rgbaToHex(r, g, b, a) {
  return "#" + componentToHex(r) + componentToHex(g) + componentToHex(b) + componentToHex(a);
}

function hslToHex(h, s, l) {
  var r, g, b;

  if (s == 0) {
    r = g = b = 0; // achromatic
  } else {
    function hue2rgb(p, q, t) {
      if (t < 0) t += 1;
      if (t > 1) t -= 1;
      if (t < 1/6) return p + (q - p) * 6 * t;
      if (t < 1/2) return q;
      if (t < 2/3) return p + (q - p) * (2/3 - t) * 6;
      return p;
    }

    var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
    var p = 2 * l - q;

    r = Math.round(hue2rgb(p, q, h + 1/3) * 255);
    g = Math.round(hue2rgb(p, q, h) * 255);
    b = Math.round(hue2rgb(p, q, h - 1/3) * 255);
  }

  return "#" + componentToHex(r) + componentToHex(g) + componentToHex(b);
}

document.addEventListener("wheel", (e) => {
  // e.preventDefault();
  scrollId += e.deltaY;
  if (scrollId <= 0){
    scrollId = 0;
    console.log("You reached 1ᵉʳ janvier 1970")
  }
  // redrawLayers();
});

document.addEventListener("scroll", (e) => {
  // e.preventDefault();
  scrollId += e.deltaY;
  if (scrollId <= 0){
    scrollId = 0;
    console.log("You reached 1ᵉʳ janvier 1970")
  }
  // redrawLayers();
});

ready(doThit());

doThas()

function letFlow() {
  scrollId += 50;
  // redrawLayers();
} 

setInterval(letFlow, 60);