package s3browser

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

	"github.com/graph-gophers/dataloader"
	"github.com/minio/minio-go/v7"
	log "github.com/sirupsen/logrus"
)

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")
	}

	log.Debug("Invalidate cache for id: ", id)

	path := getPathFromId(id)

	loader["getFile"].Clear(ctx, dataloader.StringKey(id))
	loader["getFiles"].Clear(ctx, dataloader.StringKey(path))
	loader["listObjects"].Clear(ctx, dataloader.StringKey(path))
	loader["listObjectsRecursive"].Clear(ctx, dataloader.StringKey(path))
	return nil
}

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

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

	return nomalizeID(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)

	parent := getParentDir(path)

	log.Debug("Cache clear dir: ", path, " parent: ", parent)

	loader["getFile"].Clear(ctx, dataloader.StringKey(path))
	loader["listObjects"].Clear(ctx, dataloader.StringKey(path))
	loader["listObjectsRecursive"].Clear(ctx, dataloader.StringKey(path))
	loader["getFiles"].Clear(ctx, dataloader.StringKey(path))
	loader["getDirs"].Clear(ctx, dataloader.StringKey(parent))
	loader["listObjects"].Clear(ctx, dataloader.StringKey(parent))
	loader["listObjectsRecursive"].Clear(ctx, dataloader.StringKey(parent))

	return nil
}

func deleteMultiple(ctx context.Context, s3Client minio.Client, ids []minio.ObjectInfo) error {
	log.Debug("Delte multiple")
	objectsCh := make(chan minio.ObjectInfo, 1)

	go func() {
		defer close(objectsCh)
		for _, id := range ids {
			objectsCh <- id
		}
	}()

	for err := range s3Client.RemoveObjects(ctx, bucketName, objectsCh, minio.RemoveObjectsOptions{}) {
		log.Error("Failed to delete object ", err.ObjectName, " because: ", err.Err.Error())
		// TODO: error handel
	}

	return nil
}

// nomalizeID makes sure there is a leading "/" in the id
func nomalizeID(id string) string {
	if !strings.HasPrefix(id, "/") {
		if id == "." {
			return "/"
		}
		id = "/" + id
	}

	return id
}

func getParentDir(id string) string {
	dirs := strings.Split(id, "/")

	cut := 1
	if strings.HasSuffix(id, "/") {
		cut = 2
	}

	parent := strings.Join(dirs[:len(dirs)-cut], "/") + "/"

	return nomalizeID(parent)
}