package boxstore

import (
	"fmt"
	"os"
)

type CleanupExpiredResult struct {
	Scanned int
	Deleted int
	Skipped int
	DeletedIDs []string
	Warnings []string
}

func CleanupExpiredBoxes() (CleanupExpiredResult, error) {
	entries, err := os.ReadDir(uploadRoot)
	if err != nil {
		if os.IsNotExist(err) {
			return CleanupExpiredResult{}, nil
		}
		return CleanupExpiredResult{}, err
	}

	result := CleanupExpiredResult{
		DeletedIDs: make([]string, 0),
		Warnings:   make([]string, 0),
	}
	for _, entry := range entries {
		if !entry.IsDir() {
			continue
		}
		boxID := entry.Name()
		if !ValidBoxID(boxID) {
			continue
		}
		result.Scanned++

		manifest, err := ReadManifest(boxID)
		if err != nil {
			result.Skipped++
			if !os.IsNotExist(err) {
				result.Warnings = append(result.Warnings, fmt.Sprintf("%s: %v", boxID, err))
			}
			continue
		}
		if !IsExpired(manifest) {
			continue
		}
		if err := DeleteBox(boxID); err != nil {
			result.Skipped++
			result.Warnings = append(result.Warnings, fmt.Sprintf("%s: %v", boxID, err))
			continue
		}
		result.Deleted++
		result.DeletedIDs = append(result.DeletedIDs, boxID)
	}

	return result, nil
}