package ca

import (
	"log/slog"
	"os"
)

// calog is the package-level debug logger.
// It is active only when the environment variable UOPI_CA_DEBUG is set to a
// non-empty value at program startup.  All output goes to stderr.
var calog *slog.Logger

func init() {
	if os.Getenv("UOPI_CA_DEBUG") != "" {
		calog = slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{
			Level: slog.LevelDebug,
		}))
	}
}

// dbg emits a DEBUG log if UOPI_CA_DEBUG is set.  It is a no-op otherwise.
func dbg(msg string, args ...any) {
	if calog != nil {
		calog.Debug(msg, args...)
	}
}