document.addEventListener("DOMContentLoaded", function() {
    var form = document.getElementById("fm1");

    form.addEventListener("submit", function(e) {
        var calnet_id = document.getElementById("username");

        // Trim leading and trailing spaces
        calnet_id.value = calnet_id.value.replace(/^\s+|\s+$/g, "");

        if (calnet_id !== null) {
            // Check for the specific conditions
            if (window.location.search && decodeURIComponent(window.location.search).match(/bpr.calnet.berkeley.edu\/account-manager/) && calnet_id.value.match(/^cads\d+$/)) {
                return true;
            } else if (calnet_id.value.match(/^cads\d+$/)) {
                e.preventDefault(); // Stop form from submitting

                var message = "You're using an inactive legacy Alumni ID (cads). Click OK to learn how to fix this.";
                alert(message);

                window.location.href = "https://berkeley.service-now.com/kb?id=kb_article_view&sysparm_article=KB0014883";
                return false; // Prevent form submission
            }
        }

        // If no conditions are met, allow normal submission
        return true;
    });
});