javascript function that reverts back on 2nd button click?

im a beginner to JavaScript & html,
i made a simple button:

<button id="button6" type="button" class="btns" 
onclick="LightTheme()">Light Mode</button>

. this is supposed to change the page’s view to light mode, instead of dark.
the script is:

function LightTheme() {
    document.body.style.backgroundColor = "#DBE6FD";
    document.getElementById('button_circle').style.color = "white";
    document.getElementById('button1').style.color = "#47597E";
    document.getElementById('button2').style.color = "#47597E";
    document.getElementById('button3').style.color = "#47597E";
    document.getElementById('text_p').style.backgroundColor = "#A2DBFA";
    document.getElementById('button6').innerHTML = "Dark Mode";
}

now say I want to revert back to old settings, I will need the button to act the opposite, and switch itself back and forth between modes and clicks.
any help is appreciated!

p.s – I know this is pain to read to some of you, but im learning!!

>Solution :

You could make a function to toggle the theme, so if the theme is currently dark, it becomes light, and if it is light, it becomes dark

// keeps track of whether the theme is dark or light
let darkMode = false


function ToggleTheme() {
  // if the theme is currently dark, set it to light
  if(darkMode) {
    // set the colors for the light theme

    // update the dark mode variable
    darkMode = false
  }
  // otherwise, set it to dark
  else {
    document.body.style.backgroundColor = "#DBE6FD";
    document.getElementById('button_circle').style.color = "white";
    document.getElementById('button1').style.color = "#47597E";
    document.getElementById('button2').style.color = "#47597E";
    document.getElementById('button3').style.color = "#47597E";
    document.getElementById('text_p').style.backgroundColor = "#A2DBFA";
    document.getElementById('button6').innerHTML = "Dark Mode";

    darkMode = true
  }
}

<button id="button6" type="button" class="btns" 
onclick="ToggleTheme()">Light Mode</button>