// PW Dark Mode
// Dark Mode for Physics Wallah's website
// Tested against 'https://study.physicswallah.live/'
// Coded by: GitHub/FireHead90544 (Rudransh Joshi)
// This project is open source, you are free to modify the code to whatever extent you like just be sure to credit the original author/repository.
// I am not a primary javascript developer, so if you find some bugs/issues/errors/suggestions, please let me know.
// Contributions to the same will be appreciated.

var light = true;
var fixed = false;

// This logic handles the changing of theme
function change_theme(){
   if (light){
      document.getElementsByTagName('html')[0].style.filter = 'invert(1) hue-rotate(180deg)';
      light = false;
   }
   else{
      document.getElementsByTagName('html')[0].style.filter = 'invert(0) hue-rotate(0deg)';
      light = true;   
   }
   fix_containers();
}

// This logic handles the fixing of images and videos becoming inverted
function fix_containers() {
    var imgs = document.getElementsByTagName("img");
    var vids = document.getElementsByTagName("video");
    var pwlogo = document.getElementsByClassName('mouse_pointer')[0];
    for (var i = 0; i < imgs.length; i++) {
       if (imgs[i].style.filter === ""){
           imgs[i].style.filter = "invert(1) hue-rotate(180deg)";
       }else{
           imgs[i].style.filter = "";
       }
    }
    for (var i = 0; i < vids.length; i++) {
       if (vids[i].style.filter === ""){
           vids[i].style.filter = "invert(1) hue-rotate(180deg)";
       }else{
           vids[i].style.filter = "";
       }
    }
    if (pwlogo.style.filter === ""){pwlogo.style.filter="invert(0) hue-rotate(180deg)";}else{pwlogo.style.filter="";}
}

// Shift + Alt + D --> Dark Mode
// Shift + Alt + F --> Fix Images/Videos
document.onkeyup = function (e) {
    var evt = window.event || e;   
    if (evt.keyCode == 68 && evt.altKey && evt.shiftKey) {
        change_theme();
    }
    else if (evt.keyCode == 70 && evt.altKey && evt.shiftKey) {
        fix_containers();
    }
}

// Immediately invoke change_theme to enable dark mode on paste
change_theme();