CC      			:= -clang
CFLAGS 				:= --std=c11 -pedantic-errors -Wall -Wextra -Werror -Wno-unused-command-line-argument
CXX      			:= $(CC)
CXXFLAGS 			:= --std=c++17 -pedantic-errors -Wall -Wextra -Werror -Wno-unused-command-line-argument
LDFLAGS  			:= -pthread -ldl
BUILD    			:= ./build
OBJ_DIR  			:= $(BUILD)/objects
APP_DIR  			:= $(BUILD)/apps
DEPS_DIR  			:= $(BUILD)/deps
INCLUDE_DEPS  		:= ./include_deps
SOURCE_DEPS  		:= ./src_deps
INCLUDE  			:= -Iinclude/ -I$(INCLUDE_DEPS)

####################
# PROJECT LISTINGS #
####################

TARGET   			:= program
SRC      			:=                      \
					$(wildcard $(SOURCE_DEPS)/*.c) \
					$(wildcard $(SOURCE_DEPS)/*.cpp) \
					$(wildcard src/actions/*.cpp) \
					$(wildcard src/datastructures/*.cpp) \
					$(wildcard src/networking/*.cpp) \
					$(wildcard src/*.cpp)         \

OBJECTS  			:= $(SRC:%=$(OBJ_DIR)/%.o)

DEPS	 			:=	.deps/spdlog \
						.deps/spdlog_sqlite \
						.deps/sqlite3 \
						.deps/jinx

#############################
# DEPENDENCIES DECLARATIONS #
#############################

JINX_URL 			:= https://raw.githubusercontent.com/JamesBoer/Jinx/master/Include/Jinx.hpp
SQLITE_SPDLOG_URL 	:= https://raw.githubusercontent.com/PedroRod/sqlite_sink/master/sqlite_sink.h
SQLITE_VERSION_STR	:= sqlite-amalgamation-3320300
SQLITE_URL 			:= https://www.sqlite.org/2020/$(SQLITE_VERSION_STR).zip
SPDLOG_URL 			:= https://github.com/gabime/spdlog

deps: $(DEPS)

.deps/jinx: $(INCLUDE_DEPS)/Jinx.hpp
	@mkdir -p $(@D)
	echo $(JINX_URL) > $@

.deps/sqlite3:
	@mkdir -p $(@D)
	@rm -rf /tmp/sqlite
	@mkdir -p /tmp/sqlite
	@mkdir -p $(SOURCE_DEPS) $(INCLUDE_DEPS)
	cd /tmp/sqlite; wget --quiet --output-document=sqlite.zip $(SQLITE_URL)
	cd /tmp/sqlite; unzip sqlite.zip
	cp /tmp/sqlite/$(SQLITE_VERSION_STR)/sqlite3.h $(INCLUDE_DEPS)/sqlite3.h
	cp /tmp/sqlite/$(SQLITE_VERSION_STR)/sqlite3.c $(SOURCE_DEPS)/sqlite3.c 
	echo $(SQLITE_VERSION_STR) > $@

.deps/spdlog: $(DEPS_DIR)/libspdlog.a
	@mkdir -p $(@D)
	echo $(SPDLOG_URL) > $@

.deps/spdlog_sqlite: $(INCLUDE_DEPS)/sqlite_sink.h
	@mkdir -p $(@D)
	echo $(SQLITE_SPDLOG_URL) > $@

################################
# DEPENDENCIES IMPLEMENTATIONS #
################################

$(INCLUDE_DEPS)/Jinx.hpp:
	@mkdir -p $(@D)
	wget --quiet --output-document=$@ $(JINX_URL)

$(INCLUDE_DEPS)/sqlite_sink.h:
	@mkdir -p $(@D)
	wget --quiet --output-document=$@ $(SQLITE_SPDLOG_URL)

$(DEPS_DIR)/libspdlog.a:
	@rm -rf /tmp/spdlog
	@mkdir /tmp/spdlog
	@mkdir -p $(@D)
	cd /tmp/spdlog; git clone --quiet --depth=1 $(SPDLOG_URL)
	cd /tmp/spdlog; mkdir build
	cd /tmp/spdlog/build; cmake --log-level=ERROR ../spdlog/
	+cd /tmp/spdlog/build; make
	cp -fr /tmp/spdlog/spdlog/include/spdlog $(INCLUDE_DEPS)
	cp /tmp/spdlog/build/libspdlog.a $@

#######################
# PROJECT COMPILATION #
#######################

all:
	+make deps
	+make executable

debug:
	+make deps
	+make debug_executable

release:
	+make deps
	+make release_executable

executable: deps
executable: build $(APP_DIR)/$(TARGET)

debug_executable: CFLAGS += -DDEBUG -g
debug_executable: CXXFLAGS += -DDEBUG -g
debug_executable: build $(APP_DIR)/$(TARGET)
	gdb $(APP_DIR)/$(TARGET)

release_executable: CFLAGS += -O3 -march=native
release_executable: CXXFLAGS += -O3 -march=native
release_executable: build $(APP_DIR)/$(TARGET)

$(OBJ_DIR)/%.cpp.o: %.cpp
	@mkdir -p $(@D)
	$(CXX) $(CXXFLAGS) $(INCLUDE) -c $< -o $@ $(LDFLAGS)

$(OBJ_DIR)/%.c.o: %.c
	@mkdir -p $(@D)
	$(CC) $(CFLAGS) $(INCLUDE) -c $< -o $@ $(LDFLAGS)

$(APP_DIR)/$(TARGET): $(OBJECTS)
	@mkdir -p $(@D)
	$(CXX) $(CXXFLAGS) -o $(APP_DIR)/$(TARGET) $^ $(LDFLAGS)

.PHONY: all build clean debug release

print_objects:
	@echo $(OBJECTS)

build:
	@mkdir -p $(APP_DIR)
	@mkdir -p $(OBJ_DIR)

clean_all: clean deps_clean

clean:
	-@rm -rvf $(OBJ_DIR)/*
	-@rm -rvf $(APP_DIR)/*

deps_clean:
	-@rm -rvf include_deps/*
	-@rm -rvf src_deps/*
	-@rm -rvf $(DEPS_DIR)/*
	-@rm -rvf .deps/*