.DEFAULT_GOAL := all

include ../config.mk

BUILD := build
INCLUDE := include
DEPS := imgui hammer

# Dear ImGui
IMGUI_UPSTREAM := https://github.com/ocornut/imgui.git
IMGUI_BRANCH := docking
IMGUI_REF := v1.92.3-docking
IMGUI_SRC := imgui

# Hammer
# HAMMER_UPSTREAM := https://github.com/UpstandingHackers/hammer.git
# HAMMER_BRANCH := master
# HAMMER_REF := cc733ffb77cb13071322353d0e17a7e57a15ebe6
# XXX: WARNING: pin HAMMER_REF to avoid bad commits breaking enby
HAMMER_UPSTREAM := https://forge.imbored.dev/emileclarkb/hammer.git
HAMMER_BRANCH := main
HAMMER_REF := $(HAMMER_BRANCH)
HAMMER_SRC := hammer/src

# = DEARIMGUI - VALID BACKENDS =
# = backends/imgui_impl_%.o    =
# allegro5 glfw    sdlgpu3
# android  glut    sdlrenderer2
# dx9      opengl2 sdlrenderer3
# dx10     opengl3 vulkan
# dx11     sdl2    wgpu
# dx12     sdl3    win32
IMGUI_ENABLE_BACKENDS := sdl3 opengl3

# = HAMMER - VALID PARSERS =
# = parsers/%.o            =
# action        and         attr_bool bind
# bits          butnot      ch        charset
# choice        difference  end       endianness
# epsilon       ignore      ignoreseq indirect
# int_range     many        not       nothing
# optional      permutation sequence  token
# unimplemented whitespace  xor       value
HAMMER_ENABLE_PARSERS := action        and         attr_bool bind       \
					     bits          butnot      ch        charset    \
					     choice        difference  end       endianness \
					     epsilon       ignore      ignoreseq indirect   \
					     int_range     many        not       nothing    \
					     optional      permutation sequence  token      \
					     unimplemented whitespace  xor       value
# = HAMMER - VALID BACKENDS =
# = backends/%.o            =
# packrat  llk  regex  glr  lalr  lr  lr0
HAMMER_ENABLE_BACKENDS = packrat llk regex glr lalr lr lr0



IMGUI_BACKENDS := $(foreach backend, $(IMGUI_ENABLE_BACKENDS), backends/imgui_impl_$(backend).o)

IMGUI_OBJS := imgui.o          imgui_demo.o                   \
			  imgui_draw.o     imgui_tables.o imgui_widgets.o \
			  imgui_freetype.o imgui_stdlib.o                 \
			  $(IMGUI_BACKENDS)



HAMMER_PARSERS := $(foreach parser, $(HAMMER_ENABLE_PARSERS), parsers/$(parser).o)
HAMMER_BACKENDS := $(foreach backend, $(HAMMER_ENABLE_BACKENDS), backends/$(backend).o)

HAMMER_TESTS := t_benchmark t_bitreader  t_bitwriter t_parser \
				t_grammar   t_regression t_mm        t_misc

HAMMER_HEADERS := hammer.h         glue.h                    allocator.h          \
				  backends/regex.h backends/contextfree.h    platform.h           \
				  internal.h       parsers/parser_internal.h compiler_specifics.h

HAMMER_OBJS = hammer.o          glue.o             benchmark.o        \
			  cfgrammar.o       desugar.o          registry.o         \
			  allocator.o       system_allocator.o sloballoc.o        \
			  bitreader.o       bitwriter.o        pprint.o           \
			  datastructures.o  $(HAMMER_PARSERS)  $(HAMMER_BACKENDS)
ifeq ($(PLATFORM), WINDOWS_NT)
    HAMMER_OBJS += platform_win32.o tsearch.o
else
    HAMMER_OBJS += platform_bsdlike.o
endif


# === MACRO DEFINITIONS ===
define libpath =
$(addprefix lib, $(1).a)
endef

SYNC := $(addsuffix -sync, $(DEPS))
STATICLIBS := $(foreach dep, $(DEPS), $(call libpath, $(dep)))

# === BUILD TARGETS === 
$(BUILD): $(addprefix $(BUILD)/, $(DEPS))
$(BUILD)/imgui:
	mkdir -p $@ $@/backends
$(BUILD)/hammer:
	mkdir -p $@ $@/parsers $@/backends
$(INCLUDE): $(INCLUDE)/hammer
$(INCLUDE)/hammer: $(addprefix $(HAMMER_SRC)/, $(HAMMER_HEADERS))
	mkdir -p $@
	cp $^ $@

$(IMGUI_SRC)/%: imgui
	test -f $@
$(HAMMER_SRC)/%: hammer
	test -f $@

# NOTE: $(INCLUDE) will force gmake to call the sync target
all: $(BUILD) $(INCLUDE) $(STATICLIBS)
libimgui.a: imgui $(addprefix $(BUILD)/imgui/, $(IMGUI_OBJS))
	ar rcs $@ $(filter %.o, $^)
libhammer.a: hammer $(addprefix $(BUILD)/hammer/, $(HAMMER_OBJS))
	ar rcs $@ $(filter %.o, $^)

$(BUILD)/imgui/imgui_stdlib.o: $(IMGUI_SRC)/misc/cpp/imgui_stdlib.cpp
	$(CXX) -c $^ -o $@ -I$(IMGUI_SRC)
$(BUILD)/imgui/imgui_freetype.o: $(IMGUI_SRC)/misc/freetype/imgui_freetype.cpp
	$(CXX) -c $^ -o $@ -I$(IMGUI_SRC)
$(BUILD)/imgui/%.o: $(IMGUI_SRC)/%.cpp
	$(CXX) -c $^ -o $@ -I$(IMGUI_SRC)
$(BUILD)/imgui/backends/%.o: $(IMGUI_SRC)/backends/%.cpp
	$(CXX) -c $^ -o $@ -I$(IMGUI_SRC)

$(BUILD)/hammer/%.o: $(HAMMER_SRC)/%.c
	$(CC) -c $^ -o $@ -I$(HAMMER_SRC)
$(BUILD)/hammer/parsers/%.o: $(HAMMER_SRC)/parsers/%.c
	$(CC) -c $^ -o $@ -I$(HAMMER_SRC) -I$(HAMMER_SRC)/parsers
$(BUILD)/hammer/backends/%.o: $(HAMMER_SRC)/backends/%.c
	$(CC) -c $^ -o $@ -I$(HAMMER_SRC) -I$(HAMMER_SRC)/backends

	
# === SYNC TARGETS ===
.PHONY: sync $(SYNC)
sync: $(SYNC)

imgui:
	mkdir -p $@
	git -C $@ init
	git -C $@ remote add upstream $(IMGUI_UPSTREAM)
	$(MAKE) $@-sync
imgui-sync: imgui
	git -C $< fetch upstream --tags --verbose
	git -C $< -c advice.detachedHead=false checkout $(IMGUI_REF)

hammer:
	mkdir -p $@
	git -C $@ init
	git -C $@ remote add upstream $(HAMMER_UPSTREAM)
	$(MAKE) $@-sync
hammer-sync: hammer
	git -C $< fetch upstream --verbose
	git -C $< -c advice.detachedHead=false checkout $(HAMMER_REF)

# === UTILITY TARGETS === 
CLEAN_DEP = $(@:clean-%=%)
.PHONY: clean clean-% 
clean: $(CLEAN_DEPS)
	rm -rf $(INCLUDE) $(BUILD) $(STATICLIBS)
clean-%:
	rm -rf $(INCLUDE)/$(CLEAN_DEP) $(BUILD)/$(CLEAN_DEP) $(call libpath, $(CLEAN_DEP))
	
PURGE_DEP = $(@:purge-%=%)
.PHONY: purge purge-%
purge: $(PURGE_DEPS) clean
	rm -rf $(DEPS)
purge-%: clean-%
	rm -rf $(PURGE_DEP)