function addTag(tag) {
    const textarea = document.getElementById('postContent');
    if (textarea) {
        switch (tag) {
            case 'read_more':
                textarea.value += "\n<!--more-->\n";
                break;
            case 'img':
                textarea.value += "\n<img src=\"\" />\n";
                break;
            case 'list':
                textarea.value += "\n<ul>\n<li></li>\n</ul>\n";
                break;
        }
    }
}

function wrapSelectedTextWithTag(tag) {
    const textarea = document.getElementById('postContent');
    const selectionStart = textarea.selectionStart;
    const selectionEnd   = textarea.selectionEnd;
    const before  = textarea.value.substring(0, selectionStart);
    const selectedText = textarea.value.substring(selectionStart, selectionEnd);
    const after   = textarea.value.substring(selectionEnd);
    const newValue = before + `<${tag}>` + selectedText + `</${tag}>` + after;
    textarea.value = newValue;
    const newPos = selectionStart + tag.length + 2 + selectedText.length + tag.length + 3;
    textarea.focus();
    textarea.setSelectionRange(selectionStart, newPos);
  }