# Description: R-package torch
# URL: https://cran.r-project.org/web/packages/torch
# Maintainer: Petar Petrov, slackalaxy at gmail dot com
# Depends on: r r4-bit64 r4-callr r4-cli r4-coro r4-desc r4-glue r4-jsonlite r4-magrittr r4-r6 r4-rcpp r4-rlang r4-safetensors r4-scales r4-withr
# Optional: r4-covr r4-katex r4-knitr r4-mvtnorm r4-numderiv r4-palmerpenguins r4-rmarkdown r4-testthat

name=r4-torch
version=0.17.0
release=2
source=(https://cloud.r-project.org/src/contrib/torch_${version}.tar.gz
	https://download.pytorch.org/libtorch/cpu/libtorch-shared-with-deps-2.8.0+cpu.zip
	https://torch-cdn.mlverse.org/binaries/refs/heads/cran/v${version}/latest/lantern-$version+cpu+x86_64-Linux.zip)

build() {
	cd torch
	mkdir -p $PKG/usr/lib/R/library
	R CMD INSTALL . -l $PKG/usr/lib/R/library
	
	# The code below will automatically fetch and install libtorch and lantern at build time.
	# Bake libtorch + lantern into the package itself at build time,
	# so end users never hit the runtime download/permission issue.
	#export TORCH_HOME=$PKG/usr/lib/R/library/torch
	#Rscript -e '.libPaths(c("'"$PKG"'/usr/lib/R/library", .libPaths())); torch::install_torch()'
	
	# We do it manually:
	cp -a $SRC/libtorch/* $PKG/usr/lib/R/library/torch/
	cp -a $SRC/lantern-$version+cpu+x86_64-Linux/* $PKG/usr/lib/R/library/torch/
}