(defun log-scan (&optional (lines 100))
  "Reads the last LINES lines of the system log file."
  (let ((log-file (merge-pathnames "logs/agent.log" (uiop:getenv "SYSTEM_DIR"))))
    (if (uiop:file-exists-p log-file)
        (uiop:run-program `("tail" "-n" ,(write-to-string lines) ,(namestring log-file)) :output :string)
        "Log file not found.")))

(defun log-summarize (logs)
  "Symbolic summary of LOGS focusing on errors and warnings."
  (let ((lines (uiop:split-string logs :separator '(#\Newline)))
        (errors 0)
        (warnings 0))
    (dolist (line lines)
      (cond
        ((cl-ppcre:scan "ERROR" line) (incf errors))
        ((cl-ppcre:scan "WARN" line) (incf warnings))))
    (format nil "Log Summary: ~a errors, ~a warnings found in scan." errors warnings)))