#!/usr/bin/make -f

# export DH_VERBOSE=1

# dh_python3 needs DEB_HOST_ARCH, so ... sledge hammer:
include /usr/share/dpkg/default.mk

export DEB_BUILD_MAINT_OPTIONS = hardening=+all
export LIBS="pthread"
export DESTDIR=debian/tmp

## Memory consumption issues on some autobuilders have been causing
## build failures.  There are three ways to address such issues:
## (a) reduce parallelism, e.g., dh $@ --max-parallel=2
## (b) reduce GCC memory usage, e.g., g++ --param ggc-min-expand=20 to
## reduce abrupt memory spikes, and g++ -g0 to skip debugging info.
## (c) switch to clang.

## Force Compiler to CLANG if installed. Otherwise use GCC but try to
## conserve memory. The build dependencies try to install CLANG, but
## give a dummy alternative so the build can proceed even if it is
## unavailable.
## Note: this requires build dependencies of the form
##     clang [!alpha !hppa !ia64 !m68k !sh4 !x32],
##     libomp-dev [!alpha !hppa !ia64 !m68k !sh4 !x32],

# ifeq ($(shell type clang > /dev/null && echo found),found)
# export CC=clang
# export CXX=clang++
# else

## These issues have occurred post-2.1.x in two places: Ubuntu
## Launchpad, and some particular Debian architectures including
## armhf, mips, mipsel, m68k, kfreebsd-amd64, kfreebsd-i386.

## For that reason, I am activating all of the above space-reduction
## mechanisms on Ubuntu, all 32-bit architectures, and all kfreebsd
## systems. And I am setting the build to single threaded on all
## architectures.

DH_FLAGS += --max-parallel=1

ifeq ($(shell dpkg-vendor --derives-from Ubuntu && echo yes),yes)
SAVE_SPACE=yes
endif

ifeq ($(shell dpkg-architecture --query DEB_BUILD_ARCH_BITS),32)
SAVE_SPACE=yes
endif

ifeq ($(shell dpkg-architecture --query DEB_BUILD_ARCH_OS),kfreebsd)
SAVE_SPACE=yes
endif

ifeq ($(SAVE_SPACE),yes)
ifneq (, $(filter $(shell dpkg-architecture -qDEB_HOST_ARCH_CPU),mips mipsel))
	export DEB_CXXFLAGS_MAINT_APPEND = --param ggc-min-expand=5 -g0
else
	export DEB_CXXFLAGS_MAINT_APPEND = --param ggc-min-expand=20 -g0
endif
endif
# endif

DO_IT_TO_JULIA=OFF
TAKE_IT_TO_GO=OFF
WHY_R_WHY_NOT=OFF

%:
	dh $@ --without python2 --with python3 --buildsystem=cmake ${DH_FLAGS}

# ON or OFF
# Fails as of 4.2.0, "17 < 17"
BUILD_TESTS=OFF

override_dh_auto_configure:
	dh_auto_configure -- -DCMAKE_LIBRARY_PATH=$(DEB_HOST_MULTIARCH) \
		-DDEBUG=ON \
		-DPROFILE=OFF \
		-DARMA_EXTRA_DEBUG=OFF \
		-DBUILD_CLI_EXECUTABLES=ON \
		-DBUILD_PYTHON_BINDINGS=ON \
		-DPYTHON_EXECUTABLE=/usr/bin/python3 \
		-DBUILD_JULIA_BINDINGS=$(DO_IT_TO_JULIA) \
		-DBUILD_GO_BINDINGS=$(TAKE_IT_TO_GO) \
		-DBUILD_R_BINDINGS=$(WHY_R_WHY_NOT) \
		-DBUILD_TESTS=$(BUILD_TESTS) \
		-DBUILD_SHARED_LIBS=ON \
		-DDISABLE_DOWNLOADS=ON \
		-DSTB_IMAGE_INCLUDE_DIR=/usr/include/stb \
		-DUSE_OPENMP=ON

ifeq ($(BUILD_TESTS),OFF)
override_dh_auto_test:
	@echo "Build time testing disabled."
endif

execute_after_dh_python3:
	dh_numpy3

execute_after_dh_install:
	@echo "use shared jquery.js javascript library"
	for f in $$(find debian/mlpack-doc -name jquery.js); do \
	  ln --verbose --symbolic --force /usr/share/javascript/jquery/jquery.js $$f; \
	done
	@echo "remove byte-compiled python files per policy"
	-find debian/python-mlpack  -name '*.pyc' -ls -delete || true
	-find debian/python3-mlpack -name '*.pyc' -ls -delete || true
	@echo "remove extra license file"
	-rm --verbose debian/libmlpack-dev/usr/include/mlpack/core/std_backport/LICENSE.txt
	@echo "move stray documentation files into /usr/share/doc/"
	(test \! -d debian/libmlpack-dev || \
	(cd debian/libmlpack-dev && \
	 for f in $$(find usr/include -type f \! -name '*.hpp' \! -name '*.cpp'); do \
	   mkdir -p usr/share/doc/libmlpack-dev/$$(dirname $$f) && \
	   mv --verbose $$f usr/share/doc/libmlpack-dev/$$(dirname $$f)/; \
	 done))
	(test \! -d debian/python3-mlpack || \
	(cd debian/python3-mlpack && \
	 for f in $$(find usr/lib -type f -name '*.txt'); do \
	   mkdir -p usr/share/doc/python3-mlpack/$$(dirname $$f) && \
	   mv --verbose $$f usr/share/doc/python3-mlpack/$$(dirname $$f)/; \
	 done))

override_dh_installdocs:
	dh_installdocs -pmlpack-doc --doc-main-package libmlpack-dev
	dh_installdocs -Nmlpack-doc

override_dh_installexamples:
	dh_installexamples -pmlpack-doc --doc-main-package libmlpack-dev
	dh_installexamples -Nmlpack-doc

execute_after_dh_installexamples:
	@echo "Search and destroy stray VCS support files"
	-find debian/mlpack-doc -name .gitignore -ls -delete || true
	@echo "Remove empty directory"
	-rmdir debian/mlpack-doc/usr/share/doc/libmlpack-dev/examples/sample-ml-app/sample-ml-app/data/

override_dh_installchangelogs:
	dh_installchangelogs HISTORY.md