package mainHandler

import (
	"context"
	"fmt"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
	"google.golang.org/protobuf/types/known/emptypb"
	pb "imageStorage/pkg/proto/imageStorage"
	"os"
	"path/filepath"
	"strings"
)

func (i *ImageHandler) UploadImage(ctx context.Context, req *pb.UploadMerchImageRequest) (*pb.UploadMerchImageResponse, error) {
	if len(req.ImageData) == 0 {
		return nil, status.Errorf(codes.InvalidArgument, "image data is empty")
	}

	path := i._makeMerchImagePath(req.UserUuid, req.MerchUuid)
	if err := os.MkdirAll(path, 0777); err != nil {
		return nil, err
	}
	full := filepath.Join(path, "full.jpg")
	thumbnail := filepath.Join(path, "thumbnail.jpg")

	fullFile, err := os.Create(full)
	if err != nil {
		return nil, err
	}
	defer fullFile.Close()

	thumbnailFile, err := os.Create(thumbnail)
	if err != nil {
		return nil, err
	}
	defer thumbnailFile.Close()

	if err = i.converter.ConvertAndSave(req.ImageData, fullFile, thumbnailFile); err != nil {
		return nil, err
	}

	response := &pb.UploadMerchImageResponse{
		FullImage: i._makeMerchImageURL(req.UserUuid, req.MerchUuid, full),
		Thumbnail: i._makeMerchImageURL(req.UserUuid, req.MerchUuid, thumbnail),
	}

	return response, nil
}

func (i *ImageHandler) GetImage(ctx context.Context, req *pb.GetImageRequest) (*pb.GetImageResponse, error) {
	path := i._makeMerchImagePath(req.UserUuid, req.MerchUuid)
	unk := status.Error(codes.InvalidArgument, "unknown image type")

	switch req.ImgType {
	case pb.ImageType_UNKNOWN:
		return nil, unk
	case pb.ImageType_FULL:
		return &pb.GetImageResponse{
			Url:  fmt.Sprintf("%s/%s", i.domain, filepath.Join(path, "full.jpg")),
			Etag: "",
		}, nil
	case pb.ImageType_THUMBNAIL:
		return &pb.GetImageResponse{
			Url:  fmt.Sprintf("%s/%s", i.domain, filepath.Join(path, "thumbnail.jpg")),
			Etag: "",
		}, nil

	default:
		return nil, unk
	}
}

func (i *ImageHandler) DeleteImage(ctx context.Context, req *pb.DeleteImageRequest) (*emptypb.Empty, error) {
	path := i._makeMerchImagePath(req.UserUuid, req.MerchUuid)

	entries, err := os.ReadDir(path)
	if err != nil {
		if os.IsNotExist(err) {
			return &emptypb.Empty{}, nil
		}
		return nil, err
	}

	for _, entry := range entries {
		if !entry.IsDir() {
			filePath := filepath.Join(path, entry.Name())
			if err := os.Remove(filePath); err != nil {
				return nil, err
			}
		}
	}

	return &emptypb.Empty{}, nil
}

func (i *ImageHandler) _makeMerchImagePath(u, m string) string {
	return fmt.Sprintf("%s/merchImages/%s/%s", i.volume, u, m)
}

func (i *ImageHandler) _makeMerchImageURL(u, m, n string) string {
	d := strings.TrimSuffix(i.domain, "/")
	return fmt.Sprintf("%s/merchImages/%s/%s/%s", d, u, m, n)
}