Simple Note taker

Simple Note taker allows you to easily take notes while browsing the web. Simply select any text on a webpage.
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// ==UserScript==
// @name         Simple Note taker
// @description  Simple Note taker allows you to easily take notes while browsing the web. Simply select any text on a webpage.
// @author       momoehab
// @match      *://*/*
// @license MIT
// @version 0.0.1.20240609220313
// @namespace https://greasyfork.org/users/1315328
// ==/UserScript==

function getSelectedText() {
    var text = "";
    if (typeof window.getSelection != "undefined") {
        text = window.getSelection().toString().trim();
    } else if (typeof document.selection != "undefined" && document.selection.type == "Text") {
        text = document.selection.createRange().text.trim();
    }
    return text.toUpperCase(); // Convert selected text to uppercase
}

function handleSelection() {
    var selectedText = getSelectedText();
    if (selectedText) {
        const storedText = localStorage.getItem(selectedText);
        if (storedText) {
            const shouldDelete = confirm("Info: " + storedText + "\nWant to delete?");
            if (shouldDelete) {
                var searchTerm = storedText; // Get the text of the item to delete
                removeSpanAndUnderline(searchTerm);
                localStorage.removeItem(selectedText);

            }

        } else {
            const newText = prompt("You selected: " + selectedText + "\nEnter details:");
            if (newText !== null) {
                localStorage.setItem(selectedText, newText);
            }
        }
    }
}

document.addEventListener("mouseup", handleSelection);
document.addEventListener("keyup", function (event) {
    if (event.key === "Enter") {
        handleSelection();
    }
});

// Underline previously selected words with dotted line and show data as alt text on mouseover
document.addEventListener("DOMContentLoaded", function () {
    var storedWords = Object.keys(localStorage);
    storedWords.forEach(function (word) {
        var bodyHTML = document.body.innerHTML;
        var re = new RegExp("\\b(" + word.replace(/[.*+?^${}()|[\]\\]/g, '\\$&') + ")\\b", "gi");
        var data = localStorage.getItem(word);
        bodyHTML = bodyHTML.replace(re, function (match) {
            return '<span style="text-decoration: underline dotted" data-text="' + data + '" onmouseover="this.title=this.getAttribute(\'data-text\')">' + match + '</span>';
        });
        document.body.innerHTML = bodyHTML;
    });
});

function removeSpanAndUnderline(word) {
    // Get all spans in the document
    var spans = document.getElementsByTagName('span');

    // Iterate through all spans
    for (var i = 0; i < spans.length; i++) {
        var span = spans[i];

        // Check if the span contains the specific word and is underlined
        if (span.textContent.includes(word) && span.style.textDecoration === 'underline') {
            // Remove the underline
            span.style.textDecoration = 'none';

            // Replace the span with its content
            var textNode = document.createTextNode(span.textContent);
            span.parentNode.replaceChild(textNode, span);
        }
    }
}