package runtimelogs

import (
	"os"
	"strings"

	"evobgp/internal/store"
)

// Service performs filesystem operations on runtime log files.
type Service struct {
	cfg Config
}

// NewService returns a runtime logs FS service.
func NewService(cfg Config) *Service {
	return &Service{cfg: cfg}
}

// Available reports whether the service can access runtime logs.
func (s *Service) Available() bool {
	return s.cfg.Enabled()
}

// Config returns a copy of the service configuration.
func (s *Service) Config() Config {
	return s.cfg
}

// ListFiles returns metadata for *.log files in the configured root.
func (s *Service) ListFiles() ([]store.RuntimeLogFile, error) {
	if !s.Available() {
		return nil, ErrUnavailable
	}
	entries, err := os.ReadDir(s.cfg.RootDir)
	if err != nil {
		return nil, err
	}
	out := make([]store.RuntimeLogFile, 0, len(entries))
	for _, ent := range entries {
		if ent.IsDir() {
			continue
		}
		name := ent.Name()
		if strings.HasPrefix(name, ".") {
			continue
		}
		if err := ValidateFilename(name); err != nil {
			continue
		}
		info, err := ent.Info()
		if err != nil {
			continue
		}
		if info.IsDir() {
			continue
		}
		out = append(out, store.RuntimeLogFile{
			Name:       name,
			SizeBytes:  info.Size(),
			ModifiedAt: info.ModTime().UTC(),
		})
	}
	return out, nil
}