CONFIG ?= Debug
LIB ?= 0

ifeq ($(CONFIG),Debug)
BUILD_DIR     := build/Debug
FUNC_OPTFLAGS := -Og -g -fno-strict-aliasing
OPTFLAGS      := -Og -g -fno-strict-aliasing
# Static C runtime linking
LIBS          := -Wl,/nodefaultlib:libcmt -Wl,/nodefaultlib:ucrt -Wl,/nodefaultlib:libucrt -llibcmtd -llibvcruntimed -llibucrtd
# Dynamic
# LIBS          := -Wl,/nodefaultlib:libcmt -Wl,/nodefaultlib:ucrt -Wl,/nodefaultlib:libucrt -lmsvcrtd -lvcruntimed -lucrtd
else ifeq ($(CONFIG),Release)
BUILD_DIR     := build/Release
FUNC_OPTFLAGS := -O2 -g -fno-strict-aliasing
OPTFLAGS      := -O2 -g -fno-strict-aliasing
else
$(error "Invalid build configuration: $(CONFIG)")
endif

ifeq ($(OS),Windows_NT)
    DYN_EXT  := .dll
    LIB_EXT  := .lib
    EXE_EXT  := .exe
    AR       := clang++
    ARFLAGS  := $(OPTFLAGS) -fuse-ld=llvm-lib -o
    # Static C runtime linking
    LIBS     := -Wl,/nodefaultlib:libcmt -Wl,/nodefaultlib:ucrt -Wl,/nodefaultlib:libucrt -llibcmt -llibvcruntime -llibucrt
    # Dynamic
    # LIBS   := -Wl,/nodefaultlib:libcmt -Wl,/nodefaultlib:ucrt -Wl,/nodefaultlib:libucrt -lmsvcrt -lvcruntime -lucrt
    LIB_DIR  ?= C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.29.30133\lib\x64
    UCRT_DIR ?= C:\Program Files (x86)\Windows Kits\10\lib\10.0.22000.0\ucrt\x64;
    SDK_DIR  ?= C:\Program Files (x86)\Windows Kits\10\lib\10.0.22000.0\um\x64
    define mkdir
        mkdir $(subst /,\\,$(1))
    endef
    define rmdir
        rmdir /S /Q $(subst /,\\,$(1))
    endef
else
    DYN_EXT := .so
    LIB_EXT := .a
    EXE_EXT := 
    LIB_PRE := lib
    AR      := ar
    ARFLAGS := rcs
    define mkdir
        mkdir -p $(1)
    endef
    define rmdir
        rm -rf $(1)
    endef
endif

SRC_DIRS := portultra src rsp

# Add the main folder if not building a library
ifneq ($(LIB),1)
SRC_DIRS += src/main
endif

FUNCS_DIR := RecompiledFuncs
FUNCS_LIB := $(BUILD_DIR)/$(LIB_PRE)RecompiledFuncs$(LIB_EXT)
FUNCS_C_SRCS   := $(wildcard $(FUNCS_DIR)/*.c)
FUNCS_CXX_SRCS := $(wildcard $(FUNCS_DIR)/*.cpp)

FUNC_BUILD_DIR := $(BUILD_DIR)/RecompiledFuncs
FUNCS_C_OBJS   := $(addprefix $(BUILD_DIR)/,$(FUNCS_C_SRCS:.c=.o))
FUNCS_CXX_OBJS := $(addprefix $(BUILD_DIR)/,$(FUNCS_CXX_SRCS:.cpp=.o))
ALL_FUNC_OBJS  := $(FUNCS_C_OBJS) $(FUNCS_CXX_OBJS)

BUILD_SRC_DIRS := $(addprefix $(BUILD_DIR)/,$(SRC_DIRS))
C_SRCS   := $(foreach dir,$(SRC_DIRS),$(wildcard $(dir)/*.c))
CXX_SRCS := $(foreach dir,$(SRC_DIRS),$(wildcard $(dir)/*.cpp))

C_OBJS   := $(addprefix $(BUILD_DIR)/,$(C_SRCS:.c=.o))
CXX_OBJS := $(addprefix $(BUILD_DIR)/,$(CXX_SRCS:.cpp=.o))
ALL_OBJS := $(C_OBJS) $(CXX_OBJS)


CC  := clang
CXX := clang++
LD  := clang++

FUNC_CFLAGS   := $(FUNC_OPTFLAGS) -c -Wno-unused-but-set-variable
FUNC_CXXFLAGS := $(FUNC_OPTFLAGS) -std=c++20 -c
FUNC_CPPFLAGS := -Iinclude

WARNFLAGS := -Wall -Wextra -Wpedantic -Wno-gnu-anonymous-struct
CFLAGS    := -ffunction-sections -fdata-sections -march=nehalem $(OPTFLAGS) $(WARNFLAGS) -c
CXXFLAGS  := -ffunction-sections -fdata-sections -march=nehalem $(OPTFLAGS) $(WARNFLAGS) -std=c++20 -c
CPPFLAGS  := -Iinclude -Ithirdparty

ifeq ($(LIB),1)
TARGET := $(BUILD_DIR)/MMRecomp$(DYN_EXT)
LDFLAGS += -shared
else
TARGET := $(BUILD_DIR)/MMRecomp$(EXE_EXT)
endif

ifeq ($(OS),Windows_NT)
LDFLAGS := -v -Wl,/OPT:REF $(OPTFLAGS) $(LIBS) -L"$(LIB_DIR:;=)" -L"$(UCRT_DIR:;=)" -L"$(SDK_DIR:;=)" lib/RT64/$(CONFIG)/mupen64plus-video-rt64.lib lib/SDL2-2.24.0/lib/x64/SDL2.lib
CPPFLAGS += -Ilib/SDL2-2.24.0/include
else
LDFLAGS := $(OPTFLAGS) -L$(BUILD_DIR) -lRecompiledFuncs -L. -lrt64 -lSDL2 -lX11 -Wl,--gc-sections
FUNC_CFLAGS   += -ffunction-sections -fdata-sections
FUNC_CXXFLAGS += -ffunction-sections -fdata-sections
EXTRA_DEPS := librt64.a
endif

default: $(TARGET)

clean:
	$(call rmdir,$(BUILD_DIR))

cleanfuncs:


$(FUNCS_CXX_OBJS) : $(BUILD_DIR)/%.o : %.cpp | $(FUNC_BUILD_DIR)
	@$(CXX) $(FUNC_CXXFLAGS) $(FUNC_CPPFLAGS) $^ -o $@
	
$(FUNCS_C_OBJS) : $(BUILD_DIR)/%.o : %.c | $(FUNC_BUILD_DIR)
	@$(CC) $(FUNC_CFLAGS) $(FUNC_CPPFLAGS) $^ -o $@

$(FUNCS_LIB): $(ALL_FUNC_OBJS) | $(BUILD_DIR)
	$(AR) $(ARFLAGS) $@ $(FUNC_BUILD_DIR)/*.o



$(CXX_OBJS) : $(BUILD_DIR)/%.o : %.cpp | $(BUILD_SRC_DIRS)
	$(CXX) -MMD -MF $(@:.o=.d) $(CXXFLAGS) $(CPPFLAGS) $< -o $@
	
$(C_OBJS) : $(BUILD_DIR)/%.o : %.c | $(BUILD_SRC_DIRS)
	$(CC) -MMD -MF $(@:.o=.d) $(CFLAGS) $(CPPFLAGS) $< -o $@

$(TARGET): $(FUNCS_LIB) $(ALL_OBJS) $(EXTRA_DEPS) | $(BUILD_SRC_DIRS)
	$(LD) -o $@ $^ $(LDFLAGS)

$(BUILD_SRC_DIRS) $(FUNC_BUILD_DIR) $(BUILD_DIR):
	$(call mkdir,$@)

-include $(ALL_OBJS:.o=.d)

MAKEFLAGS += --no-builtin-rules
.SUFFIXES:
.PHONY: default clean cleanfuncs

print-% : ; $(info $* is a $(flavor $*) variable set to [$($*)]) @true