BIN := $(shell basename $$(pwd))

MANSECTION := 1
MANPAGE := $(BIN).$(MANSECTION)

BUILDDIR := build/intermediates/

SRCS := $(wildcard *.cpp)
OBJS := $(addprefix $(BUILDDIR),$(SRCS:.cpp=.o))
DEPS := $(addprefix $(BUILDDIR),$(SRCS:.cpp=.d))

CXX ?= g++
PKG_CONFIG ?= pkg-config

PREFIX ?= /usr/local
BINDIR ?= $(PREFIX)/bin
CONFIGDIR ?= $(PREFIX)/etc
DATADIR ?= $(PREFIX)/share
MANDIR ?= $(DATADIR)/man/man
DOCDIR ?= $(DATADIR)/$(BIN)/doc

RM := /bin/rm -rf
INSTALL := /usr/bin/install -c

CXXFLAGS := $(CXXFLAGS) -Wshadow -Wall -Wpedantic -Wextra -g -fno-strict-aliasing -std=c++17 -pthread
ifeq ($(DEBUG),1)
	CXXFLAGS += -D DEBUG -O0
	CONFIG := debug
else
	CXXFLAGS += -D NDEBUG -O3
	CONFIG := release
endif

LDLIBS := -lm -lpthread -lcurl -lsclogging

OUTDIR := build/$(CONFIG)/

.PHONY: all clean install prebuild

all: prebuild $(OUTDIR)$(BIN)

prebuild:
	@mkdir -p $(BUILDDIR) $(OUTDIR)

$(OUTDIR)$(BIN): $(OBJS) $(DEPS)
	$(CXX) $(OBJS) $(LDFLAGS) $(LDLIBS) -o $(OUTDIR)$(BIN)
	@ln -sf $(OUTDIR)$(BIN) $(BIN)

$(BUILDDIR)%.o: %.cpp $(BUILDDIR)%.d Makefile
	cd $(BUILDDIR) && $(CXX) $(CXXFLAGS) -MMD -MP -MT $(notdir $@) -MF $*.d -c ../../$< && cd ../..

-include $(BUILDDIR)*.d

$(BUILDDIR)%.d: ;

clean:
	$(RM) build $(BIN)

install: $(OUTDIR)$(BIN)
	$(INSTALL) -d $(BINDIR)
	$(INSTALL) $(OUTDIR)$(BIN) $(BINDIR)
	$(INSTALL) -d $(MANDIR)$(MANSECTION)
	$(INSTALL) $(MANPAGE) $(MANDIR)$(MANSECTION)