# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved.  This file is offered as-is,
# without any warranty.


# The package path prefix, if you want to install to another root, set DESTDIR to that root
PREFIX ?= /usr
# The library path excluding prefix
LIB ?= /lib
# The resource path excluding prefix
DATA ?= /share
# The library path including prefix
LIBDIR ?= $(PREFIX)$(LIB)
# The resource path including prefix
DATADIR ?= $(PREFIX)$(DATA)
# The generic documentation path including prefix
DOCDIR ?= $(DATADIR)/doc
# The info manual documentation path including prefix
INFODIR ?= $(DATADIR)/info
# The license base path including prefix
LICENSEDIR ?= $(DATADIR)/licenses

# The target and host platform
PLATFORM = posix

# The major version number of the current Python installation
PY_MAJOR = 3
# The minor version number of the current Python installation
PY_MINOR = 5
# The version number of the current Python installation without a dot
PY_VER = $(PY_MAJOR)$(PY_MINOR)
# The version number of the current Python installation with a dot
PY_VERSION = $(PY_MAJOR).$(PY_MINOR)

# The directory for python modules
PYTHONDIR = $(LIBDIR)/python$(PY_VERSION)

# The name of the package as it should be installed
PKGNAME = pylibgamma


# The installed pkg-config command
PKGCONFIG ?= pkg-config
# The installed cython command
CYTHON ?= cython
# The installed python command
PYTHON = python$(PY_MAJOR)


# Libraries to link with using pkg-config
LIBS = python$(PY_MAJOR)

# The C standard for C code compilation
STD = c99
# Optimisation settings for C code compilation
OPTIMISE ?= -Og -g



# Flags to use when compiling
CC_FLAGS = $$($(PKGCONFIG) --cflags $(LIBS)) -std=$(STD) \
           $(OPTIMISE) -fPIC $(CFLAGS) $(CPPFLAGS)

# Flags to use when linking
LD_FLAGS = $$($(PKGCONFIG) --libs $(LIBS)) -lgamma -std=$(STD) \
           $(OPTIMISE) -shared $(LDFLAGS)


# The suffixless basename of the .py-files
PYTHON_SRC = libgamma_error libgamma_facade libgamma_method libgamma

# The suffixless basename of the .py-files
CYTHON_SRC = libgamma_native_error libgamma_native_facade libgamma_native_method


# Filename extension for -OO optimised python files
ifeq ($(shell test $(PY_VER) -ge 35 ; echo $$?),0)
PY_OPT2_EXT = opt-2.pyc
else
PY_OPT2_EXT = pyo
endif



.PHONY: all pyc-files pyo-files so-files
all: pyc-files pyo-files so-files
pyc-files: $(foreach M,$(PYTHON_SRC),src/__pycache__/$(M).cpython-$(PY_VER).pyc)
pyo-files: $(foreach M,$(PYTHON_SRC),src/__pycache__/$(M).cpython-$(PY_VER).$(PY_OPT2_EXT))
so-files: $(foreach M,$(CYTHON_SRC),bin/$(M).so)

bin/%.so: obj/%.o
	@mkdir -p bin
	$(CC) $(LD_FLAGS) -o $@ $^

obj/%.o: obj/%.c src/*.h
	$(CC) $(CC_FLAGS) -iquote"src" -c -o $@ $<

obj/%.c: obj/%.pyx
	if ! $(CYTHON) -3 -v $< ; then rm $@ ; false ; fi

obj/libgamma_native_facade.pyx: src/libgamma_native_facade.pyx
	@mkdir -p obj
	cp $< $@

obj/libgamma_native_method.pyx: src/libgamma_native_method.pyx
	@mkdir -p obj
	cp $< $@

ifeq ($(PLATFORM),windows)
obj/libgamma_native_error.pyx: src/libgamma_native_error.w32.pyx
	@mkdir -p obj
	cp $< $@
else
obj/libgamma_native_error.pyx: src/libgamma_native_error.pyx
	@mkdir -p obj
	cp $< $@
endif

src/__pycache__/%.cpython-$(PY_VER).pyc: src/%.py
	$(PYTHON) -m compileall $<

src/__pycache__/%.cpython-$(PY_VER).$(PY_OPT2_EXT): src/%.py
	$(PYTHON) -OO -m compileall $<


.PHONY: install
install: install-base

.PHONY: install-all
install-all: install-base

.PHONY: install-base
install-base: install-lib install-copyright


.PHONY: install-lib
install-lib: install-source install-compiled install-optimised install-native

.PHONY: install-source
install-source: $(foreach M,$(PYTHON_SRC),src/$(M).py)
	install -dm755 -- "$(DESTDIR)$(PYTHONDIR)"
	install -m644 $^ -- "$(DESTDIR)$(PYTHONDIR)"

.PHONY: install-compiled
install-compiled: $(foreach M,$(PYTHON_SRC),src/__pycache__/$(M).cpython-$(PY_VER).pyc)
	install -dm755 -- "$(DESTDIR)$(PYTHONDIR)/__pycache__"
	install -m644 $^ -- "$(DESTDIR)$(PYTHONDIR)/__pycache__"

.PHONY: install-optimised
install-optimised: $(foreach M,$(PYTHON_SRC),src/__pycache__/$(M).cpython-$(PY_VER).$(PY_OPT2_EXT))
	install -dm755 -- "$(DESTDIR)$(PYTHONDIR)/__pycache__"
	install -m644 $^ -- "$(DESTDIR)$(PYTHONDIR)/__pycache__"

.PHONY: install-native
install-native: $(foreach M,$(CYTHON_SRC),bin/$(M).so)
	install -dm755 -- "$(DESTDIR)$(PYTHONDIR)"
	install -m755 $^ -- "$(DESTDIR)$(PYTHONDIR)"


.PHONY: install-copyright
install-copyright: install-copying install-license

.PHONY: install-copying
install-copying: COPYING
	install -dm755 -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)"
	install -m644 $^ -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)"

.PHONY: install-license
install-license: LICENSE
	install -dm755 -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)"
	install -m644 $^ -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)"



.PHONY: uninstall
uninstall:
	-rm -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)/LICENSE"
	-rm -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)/COPYING"
	-rmdir -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)"
	-rm -- $(foreach M,$(PYTHON_SRC),"$(DESTDIR)$(PYTHONDIR)/__pycache__/$(M).cpython-$(PY_VER).$(PY_OPT2_EXT)")
	-rm -- $(foreach M,$(PYTHON_SRC),"$(DESTDIR)$(PYTHONDIR)/__pycache__/$(M).cpython-$(PY_VER).pyc")
	-rm -- $(foreach M,$(PYTHON_SRC),"$(DESTDIR)$(PYTHONDIR)/$(M).py")
	-rm -- $(foreach M,$(CYTHON_SRC),"$(DESTDIR)$(PYTHONDIR)/$(M).so")


.PHONY: clean
clean:
	-rm -r obj bin src/__pycache__