// --- Begin Email Sign In Endpoint Code ---
function macro_tracker_email_signin() {
    // (Optionally check a nonce for extra security here.)
    if ( empty( $_POST['email'] ) || empty( $_POST['password'] ) ) {
        wp_send_json_error("Email and password are required.");
        return;
    }
    
    $creds = array(
        'user_login'    => sanitize_email( $_POST['email'] ),
        'user_password' => $_POST['password'],
        'remember'      => true
    );
    
    $user = wp_signon( $creds, false );
    if ( is_wp_error( $user ) ) {
        wp_send_json_error( $user->get_error_message() );
        return;
    }
    // Login successful.
    wp_send_json_success( array( 'user_email' => $user->user_email ) );
}
add_action('wp_ajax_email_signin', 'macro_tracker_email_signin');
add_action('wp_ajax_nopriv_email_signin', 'macro_tracker_email_signin');
// --- End Email Sign In Endpoint Code ---