package s3browser

import (
	"context"
	"fmt"
	"path/filepath"

	"github.com/graph-gophers/dataloader"
)

func invalidateCache(ctx context.Context, id string) error {
	loader, ok := ctx.Value("loader").(map[string]*dataloader.Loader)
	if !ok {
		return fmt.Errorf("Failed to get loader from context")
	}

	loader["getFile"].Clear(ctx, dataloader.StringKey(id))
	loader["listObjects"].Clear(ctx, dataloader.StringKey(id))
	loader["getFiles"].Clear(ctx, dataloader.StringKey(getPathFromId(id)))

	return nil
}

func getPathFromId(id string) string {
	dir := filepath.Dir(id)

	if dir == "." {
		return "/"
	}

	return dir + "/"
}

func getFilenameFromID(id string) string {
	return filepath.Base(id)
}

func invalidateCacheForDir(ctx context.Context, path string) error {
	loader, ok := ctx.Value("loader").(map[string]*dataloader.Loader)
	if !ok {
		return fmt.Errorf("Failed to get loader from context")
	}

	log.Debug("Invalidate cache for dir: ", path)

	// FIXME: only clear required ids
	loader["getFile"].ClearAll()
	loader["listObjects"].ClearAll()
	loader["getFiles"].ClearAll()
	loader["getDirs"].ClearAll()

	return nil
}