package runtimelogs

import (
	"os"
	"path/filepath"
	"strings"
)

// Config holds runtime log filesystem settings.
type Config struct {
	// RootDir is the absolute path to runtime log files (empty disables FS API).
	RootDir string
	// ServiceName is EVOBGP_SERVICE (must be evobgp-all when set).
	ServiceName string
}

// ConfigFromEnv builds Config from EVOBGP_RUNTIME_LOGS_DIR and EVOBGP_SERVICE.
func ConfigFromEnv() Config {
	root := strings.TrimSpace(os.Getenv("EVOBGP_RUNTIME_LOGS_DIR"))
	if root != "" {
		if abs, err := filepath.Abs(root); err == nil {
			root = abs
		}
	}
	svc := strings.TrimSpace(os.Getenv("EVOBGP_SERVICE"))
	return Config{RootDir: root, ServiceName: svc}
}

// Enabled reports whether runtime log FS operations are allowed in this process.
func (c Config) Enabled() bool {
	if c.RootDir == "" || c.ServiceName != ServiceNameAll {
		return false
	}
	st, err := os.Stat(c.RootDir)
	return err == nil && st.IsDir()
}