# SPDX-License-Identifier: CC0-1.0
#
# SPDX-FileContributor: Antonio Niño Díaz, 2023-2025

export BLOCKSDS			?= /opt/blocksds/core
export BLOCKSDSEXT		?= /opt/blocksds/external

export WONDERFUL_TOOLCHAIN	?= /opt/wonderful
ARM_NONE_EABI_PATH	?= $(WONDERFUL_TOOLCHAIN)/toolchain/gcc-arm-none-eabi/bin/

# Source code paths
# -----------------

SOURCEDIRS	:= source
INCLUDEDIRS	:= include
GFXDIRS		:=
BINDIRS		:=

# Defines passed to all files
# ---------------------------

DEFINES		:= -DSAMPLE_DEFINE -DSAMPLE_DEFINE_WITH_VALUE=123

# Libraries
# ---------

LIBDIRS		:=

# Build artifacts
# ---------------

NAME		:= calculator
BUILDDIR	:= build/$(NAME)
LIBRARY		:= $(NAME).elf
DUMP		:= build/$(NAME).dump
MAP		:= build/$(NAME).map

# Tools
# -----

PREFIX		:= $(ARM_NONE_EABI_PATH)arm-none-eabi-
CC		:= $(PREFIX)gcc
CXX		:= $(PREFIX)g++
LD		:= $(PREFIX)gcc
OBJDUMP		:= $(PREFIX)objdump
MKDIR		:= mkdir
RM		:= rm -rf

# Verbose flag
# ------------

ifeq ($(VERBOSE),1)
V		:=
else
V		:= @
endif

# Source files
# ------------

ifneq ($(BINDIRS),)
    SOURCES_BIN	:= $(shell find -L $(BINDIRS) -name "*.bin")
    INCLUDEDIRS	+= $(addprefix $(BUILDDIR)/,$(BINDIRS))
endif
ifneq ($(GFXDIRS),)
    SOURCES_PNG	:= $(shell find -L $(GFXDIRS) -name "*.png")
    INCLUDEDIRS	+= $(addprefix $(BUILDDIR)/,$(GFXDIRS))
endif

SOURCES_S	:= $(shell find -L $(SOURCEDIRS) -name "*.s")
SOURCES_C	:= $(shell find -L $(SOURCEDIRS) -name "*.c")
SOURCES_CPP	:= $(shell find -L $(SOURCEDIRS) -name "*.cpp")

# Compiler and linker flags
# -------------------------

ARCH		:= -mthumb -mcpu=arm946e-s+nofp

SPECS		:= $(BLOCKSDS)/sys/crts/ds_arm9_dsl.specs

WARNFLAGS	:= -Wall

INCLUDEFLAGS	:= $(foreach path,$(INCLUDEDIRS),-I$(path)) \
		   $(foreach path,$(LIBDIRS),-I$(path)/include)

ASFLAGS		+= -x assembler-with-cpp $(DEFINES) $(INCLUDEFLAGS) \
		   $(ARCH) -ffunction-sections -fdata-sections \
		   -fvisibility=hidden -specs=$(SPECS)

CFLAGS		+= -std=gnu17 $(WARNFLAGS) $(DEFINES) $(INCLUDEFLAGS) \
		   $(ARCH) -O2 -ffunction-sections -fdata-sections \
		   -fvisibility=hidden -specs=$(SPECS)

CXXFLAGS	+= -std=gnu++17 $(WARNFLAGS) $(DEFINES) $(INCLUDEFLAGS) \
		   $(ARCH) -O2 -ffunction-sections -fdata-sections \
		   -fno-exceptions -fno-rtti \
		   -fvisibility=hidden -specs=$(SPECS)

LDFLAGS		+= $(ARCH) $(LIBDIRSFLAGS) -Wl,-Map,$(MAP) $(DEFINES) \
		   -nostdlib -Wl,--start-group $(LIBS) -Wl,--end-group -specs=$(SPECS) \
		   -Wl,--emit-relocs -Wl,--unresolved-symbols=ignore-all -Wl,--nmagic \
		   -Wl,--target1-abs

# Intermediate build files
# ------------------------

OBJS_ASSETS	:= $(addsuffix .o,$(addprefix $(BUILDDIR)/,$(SOURCES_BIN))) \
		   $(addsuffix .o,$(addprefix $(BUILDDIR)/,$(SOURCES_PNG)))

HEADERS_ASSETS	:= $(patsubst %.bin,%_bin.h,$(addprefix $(BUILDDIR)/,$(SOURCES_BIN))) \
		   $(patsubst %.png,%.h,$(addprefix $(BUILDDIR)/,$(SOURCES_PNG)))

OBJS_SOURCES	:= $(addsuffix .o,$(addprefix $(BUILDDIR)/,$(SOURCES_S))) \
		   $(addsuffix .o,$(addprefix $(BUILDDIR)/,$(SOURCES_C))) \
		   $(addsuffix .o,$(addprefix $(BUILDDIR)/,$(SOURCES_CPP)))

OBJS		:= $(OBJS_ASSETS) $(OBJS_SOURCES)

DEPS		:= $(OBJS:.o=.d)

# Targets
# -------

.PHONY: all clean dump

all: $(LIBRARY)

$(LIBRARY): $(OBJS)
	@echo "  LD      $@"
	$(V)$(LD) -o $@ $(OBJS) $(LDFLAGS)

$(DUMP): $(LIBRARY)
	@echo "  OBJDUMP $@"
	$(V)$(OBJDUMP) -h -C -Ssr $< > $@

dump: $(DUMP)

clean:
	@echo "  CLEAN"
	$(V)$(RM) $(LIBRARY) build $(BUILDDIR)

# Rules
# -----

$(BUILDDIR)/%.s.o : %.s
	@echo "  AS      $<"
	@$(MKDIR) -p $(@D)
	$(V)$(CC) $(ASFLAGS) -MMD -MP -c -o $@ $<

$(BUILDDIR)/%.c.o : %.c
	@echo "  CC      $<"
	@$(MKDIR) -p $(@D)
	$(V)$(CC) $(CFLAGS) -MMD -MP -c -o $@ $<

$(BUILDDIR)/%.arm.c.o : %.arm.c
	@echo "  CC      $<"
	@$(MKDIR) -p $(@D)
	$(V)$(CC) $(CFLAGS) -MMD -MP -marm -mlong-calls -c -o $@ $<

$(BUILDDIR)/%.cpp.o : %.cpp
	@echo "  CXX     $<"
	@$(MKDIR) -p $(@D)
	$(V)$(CXX) $(CXXFLAGS) -MMD -MP -c -o $@ $<

$(BUILDDIR)/%.arm.cpp.o : %.arm.cpp
	@echo "  CXX     $<"
	@$(MKDIR) -p $(@D)
	$(V)$(CXX) $(CXXFLAGS) -MMD -MP -marm -mlong-calls -c -o $@ $<

$(BUILDDIR)/%.bin.o $(BUILDDIR)/%_bin.h : %.bin
	@echo "  BIN2C   $<"
	@$(MKDIR) -p $(@D)
	$(V)$(BLOCKSDS)/tools/bin2c/bin2c $< $(@D)
	$(V)$(CC) $(CFLAGS) -MMD -MP -c -o $(BUILDDIR)/$*.bin.o $(BUILDDIR)/$*_bin.c

$(BUILDDIR)/%.png.o $(BUILDDIR)/%.h : %.png %.grit
	@echo "  GRIT    $<"
	@$(MKDIR) -p $(@D)
	$(V)$(BLOCKSDS)/tools/grit/grit $< -ftc -W1 -o$(BUILDDIR)/$*
	$(V)$(CC) $(CFLAGS) -MMD -MP -c -o $(BUILDDIR)/$*.png.o $(BUILDDIR)/$*.c
	$(V)touch $(BUILDDIR)/$*.png.o $(BUILDDIR)/$*.h

# All assets must be built before the source code
# -----------------------------------------------

$(SOURCES_S) $(SOURCES_C) $(SOURCES_CPP): $(HEADERS_ASSETS)

# Include dependency files if they exist
# --------------------------------------

-include $(DEPS)
