# Base macros
CC          :=  gcc
CXX         :=  g++

# DIRs
SRC_DIR     :=  ./src
OBJ_DIR     :=  ./obj
INC_DIR     :=  ./include
SOL_DIR     :=  ./soltrack-2.2
TD_DIR      :=  ./timedrift

# Compile FLAGS
CFLAGS      +=  -pedantic -O3 -fPIC -m64 -lm -DPYTHON_ENABLE
CXXFLAGS    :=  $(CFLAGS) -std=c++17

# TODO: are ALL of those Python CFLAGS actually needed...?
PFLAGS      :=  $(shell python3-config --cflags)

# Linker FLAGS
LDFLAGS     +=  $(shell python3-config --ldflags) -lm

# extra LIBS
PLIBS       :=  $(shell python3-config --libs)
LIBS        :=  $(PLIBS) -lboost_python3

# Main files
SRC         :=  $(wildcard $(SRC_DIR)/*.cpp)
HEADERS     :=  $(wildcard $(INC_DIR)/*.h)
OBJ         :=  $(addprefix $(OBJ_DIR)/,$(notdir $(SRC:.cpp=.o)))
SO_MODULE   :=  timedrift.so

# Display collected files
$(info SRC="$(SRC)")
$(info HEADERS="$(HEADERS)")
$(info LIBS="$(LIBS)")
$(info )

# TARGETS
all: build install clean

build:  $(OBJ) $(OBJ_DIR)/SolTrack.o $(OBJ_DIR)/SolTrack_RiseSet.o
    $(CXX) -Wl,--no-undefined $(CFLAGS) $(LDFLAGS) -shared $< $(LIBS) -lstdc++ \
    -Wl,-whole-archive,-export-dynamic -Wl,--no-whole-archive -ldl -o $(SO_MODULE)

install: build
    @mkdir -p $(TD_DIR)
    mv $(SO_MODULE) $(TD_DIR)/

clean:
    [ -d "$(OBJ_DIR)" ] && rm -r $(OBJ_DIR) || true

# Main targets
$(OBJ): $(SRC) $(HEADERS)
    @mkdir -p $(@D)
    $(CXX) -c $(CXXFLAGS) $(PFLAGS) -I$(INC_DIR) -o $@ $<

# External libs
$(OBJ_DIR)/SolTrack.o:  $(SOL_DIR)/SolTrack.c $(SOL_DIR)/SolTrack.h
    @mkdir -p $(@D)
    $(CC) -c $(CFLAGS) $(PFLAGS) -I$(SOL_DIR) -o $@ $<

$(OBJ_DIR)/SolTrack_RiseSet.o:  $(SOL_DIR)/SolTrack_RiseSet.c $(SOL_DIR)/SolTrack.h
    @mkdir -p $(@D)
    $(CC) -c $(CFLAGS) $(PFLAGS) -I$(SOL_DIR) -o $@ $<