# Based on c_src.mk from erlang.mk by Loic Hoguin <essen@ninenines.eu>

CURDIR := $(shell pwd)
BASEDIR := $(abspath $(CURDIR)/..)

PROJECT = libsodium

# Configuration.

C_SRC_DIR ?= $(CURDIR)
C_SRC_ENV ?= $(C_SRC_DIR)/env.mk
C_SRC_DRV ?= $(BASEDIR)/priv/$(PROJECT)_drv

C_DEPS_DIR ?= $(BASEDIR)/c_deps

# "erl" command.

ERL = erl +A0 -noinput -boot start_clean

# Platform detection.

ifeq ($(PLATFORM),)
UNAME_S := $(shell uname -s)

ifeq ($(UNAME_S),Linux)
PLATFORM = linux
else ifeq ($(UNAME_S),Darwin)
PLATFORM = darwin
else ifeq ($(UNAME_S),SunOS)
PLATFORM = solaris
else ifeq ($(UNAME_S),GNU)
PLATFORM = gnu
else ifeq ($(UNAME_S),FreeBSD)
PLATFORM = freebsd
else ifeq ($(UNAME_S),NetBSD)
PLATFORM = netbsd
else ifeq ($(UNAME_S),OpenBSD)
PLATFORM = openbsd
else ifeq ($(UNAME_S),DragonFly)
PLATFORM = dragonfly
else ifeq ($(shell uname -o),Msys)
PLATFORM = msys2
else
$(error Unable to detect platform. Please open a ticket with the output of uname -a.)
endif

export PLATFORM
endif

# System type and C compiler/flags.

ifeq ($(PLATFORM),msys2)
	C_SRC_EXECUTABLE_EXTENSION ?= .exe
	C_SRC_SHARED_EXTENSION ?= .dll
else
	C_SRC_EXECUTABLE_EXTENSION ?=
	C_SRC_SHARED_EXTENSION ?= .so
endif

C_SRC_DRV_FILE = $(C_SRC_DRV)$(C_SRC_SHARED_EXTENSION)

ifeq ($(PLATFORM),msys2)
# We hardcode the compiler used on MSYS2. The default CC=cc does
# not produce working code. The "gcc" MSYS2 package also doesn't.
	CC = /mingw64/bin/gcc
	CFLAGS ?= -O3 -std=c17 -finline-functions -fstack-protector -Wall -Wmissing-prototypes -fPIC
	CXXFLAGS ?= -O3 -std=c++14 -finline-functions -fstack-protector -Wall -fPIC
else ifeq ($(PLATFORM),darwin)
	CC ?= cc
	CFLAGS ?= -O3 -std=c17 -fstack-protector -Wall -Wmissing-prototypes -fPIC
	CXXFLAGS ?= -O3 -std=c++14 -fstack-protector -Wall -fPIC
	LDFLAGS ?= -flat_namespace -undefined suppress
else ifeq ($(PLATFORM),freebsd)
	CC ?= cc
	CFLAGS ?= -O3 -std=c17 -finline-functions -fstack-protector -Wall -Wmissing-prototypes -fPIC
	CXXFLAGS ?= -O3 -std=c++14 -finline-functions -fstack-protector -Wall -fPIC
else ifeq ($(PLATFORM),linux)
	CC ?= gcc
	CFLAGS ?= -O3 -std=c17 -finline-functions -fstack-protector -Wall -Wmissing-prototypes -fPIC
	CXXFLAGS ?= -O3 -std=c++14 -finline-functions -fstack-protector -Wall -fPIC
else ifeq ($(PLATFORM),solaris)
	CC ?= cc
	CFLAGS ?= -O3 -std=c17 -finline-functions -fstack-protector -Wall -Wmissing-prototypes -fPIC
	CXXFLAGS ?= -O3 -std=c++14 -finline-functions -fstack-protector -Wall -fPIC
	LDLIBS ?= -latomic -lssp
endif

ifneq ($(PLATFORM),msys2)
	CFLAGS += -fPIC
	CXXFLAGS += -fPIC
endif

ifneq ($(CROSSCOMPILER),)
	CC = $(CROSSCOMPILER)gcc
endif

CFLAGS += -I"$(ERTS_INCLUDE_DIR)" -I"$(ERL_INTERFACE_INCLUDE_DIR)" -I"$(LIBSODIUM_INCLUDE_DIR)"
CXXFLAGS += -I"$(ERTS_INCLUDE_DIR)" -I"$(ERL_INTERFACE_INCLUDE_DIR)" -I"$(LIBSODIUM_INCLUDE_DIR)"

LDLIBS += -L"$(ERL_INTERFACE_LIB_DIR)" \
	-lei \
	-L"$(LIBSODIUM_LIB_DIR)" -lsodium

# Dependencies.

LIBSODIUM_VSN ?= 1.0.18
LIBSODIUM_GIT ?= https://github.com/jedisct1/libsodium.git
LIBSODIUM_SRC_DIR ?= $(C_DEPS_DIR)/libsodium
LIBSODIUM_INCLUDE_DIR ?= $(LIBSODIUM_SRC_DIR)/src/libsodium/include
LIBSODIUM_LIB_DIR ?= $(LIBSODIUM_SRC_DIR)/src/libsodium/.libs
LIBSODIUM_OUTPUT_FILE ?= $(LIBSODIUM_SRC_DIR)/src/libsodium/.libs/libsodium.a
LIBSODIUM_AUTOGEN_FILE ?= $(LIBSODIUM_SRC_DIR)/autogen.sh
LIBSODIUM_CONFIGURE_FILE ?= $(LIBSODIUM_SRC_DIR)/configure
LIBSODIUM_MAKE_FILE ?= $(LIBSODIUM_SRC_DIR)/Makefile

ALL_DEPS_OUTPUT ?= $(LIBSODIUM_OUTPUT_FILE)

# Verbosity.

V ?= 0

verbose_0 = @
verbose_2 = set -x;
verbose = $(verbose_$(V))

c_verbose_0 = @echo " C     " $(?F);
c_verbose = $(c_verbose_$(V))

cpp_verbose_0 = @echo " CPP   " $(?F);
cpp_verbose = $(cpp_verbose_$(V))

dep_verbose_0 = @echo " DEP   " $(1);
dep_verbose_2 = set -x;
dep_verbose = $(dep_verbose_$(V))

gen_verbose_0 = @echo " GEN   " $@;
gen_verbose_2 = set -x;
gen_verbose = $(gen_verbose_$(V))

link_verbose_0 = @echo " LD    " $(@F);
link_verbose = $(link_verbose_$(V))

# Targets.

core_find = $(if $(wildcard $1),$(shell find $(1:%/=%) \( -type l -o -type f \) -name $(subst *,\*,$2) | grep -v " "))

ifeq ($(PLATFORM),msys2)
core_native_path = $(subst \,\\\\,$(shell cygpath -w $1))
else
core_native_path = $1
endif

ifeq ($(DRV_SOURCES),)
DRV_SOURCES := $(sort $(foreach pat,*.c *.C *.cc *.cpp,$(call core_find,$(C_SRC_DIR)/drv/,$(pat))))
endif
DRV_OBJECTS = $(addsuffix .o, $(basename $(DRV_SOURCES)))

COMPILE_C = $(c_verbose) $(CC) $(CFLAGS) $(CPPFLAGS) -c
COMPILE_CPP = $(cpp_verbose) $(CXX) $(CXXFLAGS) $(CPPFLAGS) -c

all:: deps app

app:: $(C_SRC_ENV) $(C_SRC_DRV_FILE)

ifeq ($(filter $(foreach p,$(ALL_DEPS_OUTPUT),$(if $(wildcard $(p)),,x)), x),)

deps::

else

deps:: $(LIBSODIUM_OUTPUT_FILE)

endif

test-build:: $(C_SRC_ENV) $(C_SRC_DRV_FILE)

$(C_DEPS_DIR):
	$(verbose) mkdir -p $(C_DEPS_DIR)

$(LIBSODIUM_SRC_DIR):
	$(verbose) if [ ! -f $(LIBSODIUM_SRC_DIR)/autogen.sh ]; then \
		git clone -n $(LIBSODIUM_GIT) $(LIBSODIUM_SRC_DIR) && \
		(cd $(LIBSODIUM_SRC_DIR) && git checkout -q $(LIBSODIUM_VSN)); \
	else \
		true; \
	fi

$(LIBSODIUM_CONFIGURE_FILE): $(LIBSODIUM_SRC_DIR)
	$(verbose) if [ ! -f $(LIBSODIUM_CONFIGURE_FILE) ]; then \
		(cd $(LIBSODIUM_SRC_DIR) \
			&& chmod +x $(LIBSODIUM_AUTOGEN_FILE) \
			&& $(LIBSODIUM_AUTOGEN_FILE)); \
	else \
		true; \
	fi

$(LIBSODIUM_MAKE_FILE): $(LIBSODIUM_CONFIGURE_FILE)
	$(verbose) if [ ! -f $(LIBSODIUM_MAKE_FILE) ]; then \
		(cd $(LIBSODIUM_SRC_DIR) \
			&& $(LIBSODIUM_CONFIGURE_FILE) \
			--disable-pie \
			--disable-shared \
			--enable-opt \
			--enable-static \
			--with-pic); \
	else \
		true; \
	fi

$(LIBSODIUM_OUTPUT_FILE): $(LIBSODIUM_MAKE_FILE)
	$(MAKE) -j -C $(LIBSODIUM_SRC_DIR)

$(C_SRC_DRV_FILE): $(DRV_OBJECTS)
	$(verbose) mkdir -p $(BASEDIR)/priv
	$(link_verbose) $(CC) $(DRV_OBJECTS) \
		$(LDFLAGS) -shared $(LDLIBS) \
		-o $(C_SRC_DRV_FILE)

%.o: %.c
	$(COMPILE_C) $(OUTPUT_OPTION) $<

%.o: %.cc
	$(COMPILE_CPP) $(OUTPUT_OPTION) $<

%.o: %.C
	$(COMPILE_CPP) $(OUTPUT_OPTION) $<

%.o: %.cpp
	$(COMPILE_CPP) $(OUTPUT_OPTION) $<

clean:: clean-c_src

clean-c_src:
	$(gen_verbose) rm -f $(C_SRC_DRV_FILE) $(DRV_OBJECTS)

ERL_ERTS_DIR = $(shell $(ERL) -eval 'io:format("~s~n", [code:lib_dir(erts)]), halt().')

$(C_SRC_ENV):
	$(verbose) $(ERL) -eval "file:write_file(\"$(call core_native_path,$(C_SRC_ENV))\", \
		io_lib:format( \
			\"# Generated by Erlang.mk. Edit at your own risk!~n~n\" \
			\"ERTS_INCLUDE_DIR ?= ~s/erts-~s/include/~n\" \
			\"ERL_INTERFACE_INCLUDE_DIR ?= ~s~n\" \
			\"ERL_INTERFACE_LIB_DIR ?= ~s~n\" \
			\"ERTS_DIR ?= $(ERL_ERTS_DIR)~n\", \
			[code:root_dir(), erlang:system_info(version), \
			code:lib_dir(erl_interface, include), \
			code:lib_dir(erl_interface, lib)])), \
		halt()."

distclean:: distclean-c_src-env

distclean-c_src-env:
	$(gen_verbose) rm -f $(C_SRC_ENV)

-include $(C_SRC_ENV)

ifneq ($(ERL_ERTS_DIR),$(ERTS_DIR))
$(shell rm -f $(C_SRC_ENV))
endif

distclean:: distclean-deps distclean-env

distclean-deps:
	$(gen_verbose) rm -rf $(C_DEPS_DIR)

distclean-env:
	$(gen_verbose) rm -f $(C_SRC_ENV)

format:
	$(gen_verbose) clang-format -i drv/*.c drv/*.h