##
##      Gem-graph OpenGL experiments
##
##      Desc: Makefile
##
##  Copyright (C) 2023 Arthur Menges <arthur.menges@a-lec.org>
##  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
##
##  This file is part of Gem-graph.
##
##  This program is free software: you can redistribute it and/or modify
##  it under the terms of the GNU Affero General Public License as published by
##  the Free Software Foundation, either version 3 of the License, or
##  (at your option) any later version.
##
##  This program is distributed in the hope that it will be useful,
##  but WITHOUT ANY WARRANTY; without even the implied warranty of
##  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
##  GNU Affero General Public License for more details.
##
##  You should have received a copy of the GNU Affero General Public License
##  along with this program.  If not, see <http://www.gnu.org/licenses/>.
##

.PHONY: all clean install run build_system
.DELETE_ON_ERROR: $(BINDIR)/gem-graph-client
.DEFAULT_GOAL := all

#
# Color codes
#
CL='\033[0;32m'
CL2='\033[1;36m'
CL3='\033[0m'
NC='\033[1;37m'

#
# Variables & constants
#
NTHREADS= $(shell nproc)

CC=gcc
WARNINGS= -Wall
DEBUG= -ggdb -fno-omit-frame-pointer -fdiagnostics-color=always
OPTIMIZE= -O2
INCLUDE= $(shell pkg-config --cflags glib-2.0 libxml-2.0 gtk4)
LIBS= $(shell pkg-config --libs glib-2.0 libxml-2.0 gtk4) -lGL -lGLU -lm -lepoxy -lX11 -lGLEW

BINDIR=bin
BUILDDIR=build
SRCDIR=src
vpath %.c $(SRCDIR)

SOURCES= $(shell ls -r $(SRCDIR))
BUILDBINS=$(patsubst %.c,$(BUILDDIR)/%.o,$(SOURCES))
BUILDDEPS=$(patsubst %.c,$(BUILDDIR)/%.d,$(SOURCES))

-include /etc/os-release

#
# Directories
#
$(BUILDDIR):
	@mkdir -p $@
	@echo -e ${CL2}[$@] ${CL}folder generated.${CL3}

$(BINDIR):
	@mkdir -p $@
	@echo -e ${CL2}[$@] ${CL}folder generated.${CL3}

#
# Dependencies
#
-include $(BUILDDEPS)

$(BUILDDIR)/%.d: %.c | $(BUILDDIR)
	@$(CC) -MM -MT $(@:%.d=%.o) -MF $@ $<
	@echo -e ${CL2}[$@] ${CL}dependencies generated.${CL3}

#
# Compilation
#
$(BINDIR)/gem-graph-client: $(BUILDBINS) | $(BINDIR)
	@$(CC) -o $@ $(WARNINGS) $(DEBUG) $(OPTIMIZE) $^ $(INCLUDE) $(LIBS)
	@echo -e ${CL2}[$@] ${CL}built.${CL3}


$(BUILDDIR)/%.o: %.c | $(BUILDDIR)
	@$(CC) $(WARNINGS) $(DEBUG) $(OPTIMIZE) $(INCLUDE) -c $< -o $@
	@echo -e ${CL2}[$@] ${CL}compiled.${CL3}


#
# Virtual recipes
#
clean:
	@rm -rf $(BINDIR)
	@rm -rf $(BUILDDIR)
	@echo -e ${CL2}[$@] ${CL}done.${CL3}

install:
	echo "Installing is not supported"


ifeq ($(ID), guix)
build_system:
	@echo -e ${CL2}[$@] ${CL}building through containerized manifest...${CL3}
	@guix shell --container -m ./manifest.scm -- make $(BINDIR)/gem-graph-client -j $(NTHREADS)
	@echo -e ${CL2}[$@] ${CL}done.${CL3}
else
build_system:
	@echo -e ${CL2}[$@] ${CL}building...${CL3}
	@make $(BINDIR)/gem-graph-client -j $(NTHREADS)
	@echo -e ${CL2}[$@] ${CL}done.${CL3}
endif

run: build_system
	@echo -e ${CL2}[$@] ${CL}executing...${CL3}
	@$(BINDIR)/gem-graph-client
	@echo -e ${CL2}[$@] ${CL}done.${CL3}

all:	build_system
	@echo -e ${CL2}[$@] ${CL}done.${CL3}