package storage

import (
	domain "RenewCMS/internal/domain/image"
	"sync/atomic"
)

type ReadCountingStorage struct {
	domain.Storage
	opened atomic.Int64
}

var _ domain.Storage = &ReadCountingStorage{}

func NewReadCountingStorage(inner domain.Storage) *ReadCountingStorage {
	return &ReadCountingStorage{Storage: inner}
}

func (s *ReadCountingStorage) Open(storedName string) (domain.Blob, error) {
	blob, err := s.Storage.Open(storedName)
	if err == nil {
		s.opened.Add(1)
	}
	return blob, err
}

func (s *ReadCountingStorage) Opened() int {
	return int(s.opened.Load())
}

type Logger interface {
	Printf(format string, args ...any)
}

func RunBackfillReportingReads(inner domain.Storage, logger Logger, run func(domain.Storage) error) error {
	counting := NewReadCountingStorage(inner)
	err := run(counting)
	if opened := counting.Opened(); opened > 0 {
		logger.Printf("image metadata backfill read %d images from the bucket", opened)
	}
	return err
}