package useCases

import (
	"RenewCMS/internal/domain/image"
	"context"
)

type GenerateImageVariantUseCase struct {
	images    image.Repository
	variants  image.VariantRepository
	files     image.VariantFileRepository
	renderer  image.VariantRenderer
	generator *ServeVariantUseCase
}

func NewGenerateImageVariantUseCase(images image.Repository, variants image.VariantRepository, files image.VariantFileRepository, renderer image.VariantRenderer, generator *ServeVariantUseCase) *GenerateImageVariantUseCase {
	return &GenerateImageVariantUseCase{images, variants, files, renderer, generator}
}

func (u *GenerateImageVariantUseCase) Generate(ctx context.Context, id uint32, name string) (ImageVariantView, error) {
	img, err := u.images.Get(id)
	if err != nil {
		return ImageVariantView{}, err
	}
	variant, err := u.variants.Get(name)
	if err != nil {
		return ImageVariantView{}, err
	}
	if !variant.Enabled || variant.Name != name {
		return ImageVariantView{}, image.ErrVariantNotFound
	}
	if isVectorSource(img) {
		return ImageVariantView{}, image.ErrVariantSourceUnsupported
	}
	storedName := image.StoredName(img.Path)
	if _, err := u.generator.Generate(ctx, variant, storedName); err != nil {
		return ImageVariantView{}, err
	}
	rows, err := currentFiles(u.files, storedName)
	if err != nil {
		return ImageVariantView{}, err
	}
	return viewOf(variant, img, rows, u.renderer.EncodableFormats()), nil
}