package helper

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

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

	errors "git.kapelle.org/niklas/s3browser/internal/errors"
	types "git.kapelle.org/niklas/s3browser/internal/types"
)

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, "dev", 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)
}

func IsAuth(ctx context.Context) (bool, error) {
	token, ok := ctx.Value("jwt").(*jwt.Token)

	if !ok {
		return false, errors.ExtendError("UNAUTHORIZED", "Unauthorized")
	}

	if token.Valid {
		return true, nil
	} else {
		return false, errors.ExtendError("UNAUTHORIZED", "Unauthorized")
	}
}

func CreateJWT(claims *types.JWTClaims) *jwt.Token {

	claims.ExpiresAt = time.Now().Add(time.Hour * 24).Unix()

	return jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
}

func CreateClaims(username string) *types.JWTClaims {
	return &types.JWTClaims{
		StandardClaims: jwt.StandardClaims{
			Subject: username,
		},
	}
}