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package transformers
import (
"image"
"imageboard/config"
"imageboard/utils/format"
"imageboard/utils/validators"
"strings"
"github.com/nfnt/resize"
)
func TransformImageToVariant(img image.Image, variant config.ImageSizeType) (int, int, int64, []byte, error) {
variantSizeMap := map[config.ImageSizeType]int{
config.ImageSizeTypeIcon: 64,
config.ImageSizeTypeThumbnail: 256,
config.ImageSizeTypeSmall: 512,
config.ImageSizeTypeMedium: 1024,
config.ImageSizeTypeLarge: 2048,
config.ImageSizeTypeOriginal: 0,
}
maxWidth := variantSizeMap[variant]
if maxWidth > 0 {
img = ResizeImage(img, maxWidth)
}
fileSize, imageData, err := format.GetImageSizeAndData(img)
if err != nil {
return 0, 0, 0, nil, err
}
return img.Bounds().Dx(), img.Bounds().Dy(), fileSize, imageData, nil
}
func ResizeImage(img image.Image, maxWidth int) image.Image {
if maxWidth <= 0 || img.Bounds().Dx() <= maxWidth {
return img
}
ratio := float64(maxWidth) / float64(img.Bounds().Dx())
newHeight := uint(float64(img.Bounds().Dy()) * ratio)
return resize.Resize(uint(maxWidth), newHeight, img, resize.Lanczos3)
}
func CreateUniqueFileName(sourceURLOrOriginalName, imageFormat string) string {
fileName := sourceURLOrOriginalName
if validators.IsValidURL(sourceURLOrOriginalName) {
parts := strings.Split(sourceURLOrOriginalName, "/")
fileName = parts[len(parts)-1]
}
currentTime := format.GetCurrentTimeAsTimestamp()
fileNameWithoutExtension := format.RemoveExtension(fileName)
fileName = GenerateTokenFromString(fileNameWithoutExtension + "_" + format.Int64ToString(currentTime) + "_" + GenerateUUID())
if len(fileName) > 32 {
mid := len(fileName) / 2
fileName = fileName[:mid-16] + format.Int64ToString(currentTime) + fileName[mid+16:]
}
return fileName + "." + imageFormat
}
func ConvertStringRatingToType(rating string) (config.Rating, error) {
switch rating {
case "safe":
return config.RatingSafe, nil
case "questionable":
return config.RatingQuestionable, nil
case "sensitive":
return config.RatingSensitive, nil
case "explicit":
return config.RatingExplicit, nil
default:
return config.RatingSafe, nil
}
}
func ConvertStringToContentType(contentType string) (config.ImageContentType, error) {
switch contentType {
case "image/jpeg":
return config.ImageContentTypeJPEG, nil
case "image/png":
return config.ImageContentTypePNG, nil
case "image/gif":
return config.ImageContentTypeGIF, nil
case "image/webp":
return config.ImageContentTypeWebP, nil
default:
return config.ImageContentTypeJPEG, nil
}
}
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