// ==UserScript==
// @name         Nice Names Twitch
// @version      0.1
// @description  Changes the background of chats to a contrasting color
// @author       Jerald J
// @require     https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js
// @match        https://www.twitch.tv/*
// @grant        none
// ==/UserScript==


function invert(rgb) {
    rgb = [].slice.call(arguments).join(",").replace(/rgb\(|\)|rgba\(|\)|\s/gi, '').split(',');
    for (var i = 0; i < rgb.length; i++) rgb[i] = (i === 3 ? 1 : 255) - rgb[i];
    color = rgbToHex(rgb[0], rgb[1], rgb[2]);
    color = shadeBlend(-0.5,color);
    console.log(color);
    return color;
}

function shadeBlend(p,c0,c1) {
    var n=p<0?p*-1:p,u=Math.round,w=parseInt;
    if(c0.length>7){
        var f=c0.split(","),t=(c1?c1:p<0?"rgb(0,0,0)":"rgb(255,255,255)").split(","),R=w(f[0].slice(4)),G=w(f[1]),B=w(f[2]);
        return "rgb("+(u((w(t[0].slice(4))-R)*n)+R)+","+(u((w(t[1])-G)*n)+G)+","+(u((w(t[2])-B)*n)+B)+")"
    }else{
        var f=w(c0.slice(1),16),t=w((c1?c1:p<0?"#000000":"#FFFFFF").slice(1),16),R1=f>>16,G1=f>>8&0x00FF,B1=f&0x0000FF;
        return "#"+(0x1000000+(u(((t>>16)-R1)*n)+R1)*0x10000+(u(((t>>8&0x00FF)-G1)*n)+G1)*0x100+(u(((t&0x0000FF)-B1)*n)+B1)).toString(16).slice(1)
    }
}

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

function componentToHex(c) {
    var hex = c.toString(16);
    return hex.length == 1 ? "0" + hex : hex;
}
setInterval(function(){
  $(".chat-author__display-name").each(function() {
    $(this).parent().parent().parent().css("background-color",invert($(this).css("color")));
  });
}, 500);