########################################################################################################################
# Dependency directories
########################################################################################################################

CUBE_CMSIS_DIR 	?= ../../upstream/cmsis_device_f4
CMSIS_DIR 		?= ../../upstream/CMSIS_5
MUSL_DIR		?= ../../upstream/musl
MBEDTLS_DIR		?= ../../upstream/mbedtls
TINYALLOC_DIR	?= ../../upstream/tinyalloc

########################################################################################################################
# Sources
########################################################################################################################

C_SOURCES		:= src/main.c
C_SOURCES		+= src/con_usart.c
C_SOURCES		+= src/serial.c
C_SOURCES		+= src/spi.c
C_SOURCES		+= src/gpio_helpers.c
C_SOURCES		+= src/dma_util.c
C_SOURCES		+= src/rng.c
C_SOURCES		+= src/cage.c
C_SOURCES		+= src/cage_base64.c
C_SOURCES		+= src/bech32.c
C_SOURCES		+= tinyprintf/tinyprintf.c
C_SOURCES		+= $(TINYALLOC_DIR)/tinyalloc.c

MUSL_SOURCES		:= string/strchr.c
MUSL_SOURCES		+= string/strchrnul.c
MUSL_SOURCES		+= string/strstr.c
MUSL_SOURCES		+= string/memchr.c
MUSL_SOURCES		+= string/memset.c
MUSL_SOURCES		+= string/memcmp.c
MUSL_SOURCES		+= string/memcpy.c
MUSL_SOURCES		+= string/strlen.c
MUSL_SOURCES		+= string/strnlen.c
MUSL_SOURCES		+= string/strncmp.c
MUSL_SOURCES		:= $(addprefix $(MUSL_DIR)/src/,$(MUSL_SOURCES))

C_SOURCES += $(MUSL_SOURCES)

CXX_SOURCES			+=

BUILDDIR 	?= build
BINARY 		:= tachibana-demo.elf
LDSCRIPT 	:= stm32f407.ld

########################################################################################################################
# Build parameters
########################################################################################################################

PREFIX		?= arm-none-eabi-

DEBUG		?= 1

CC			:= $(PREFIX)gcc
CXX			:= $(PREFIX)g++
LD			:= $(PREFIX)gcc
AR			:= $(PREFIX)ar
AS			:= $(PREFIX)as
SIZE		:= $(PREFIX)size
NM			:= $(PREFIX)nm
OBJCOPY		:= $(PREFIX)objcopy
OBJDUMP		:= $(PREFIX)objdump

HOST_CC				?= $(HOST_PREFIX)gcc
HOST_CXX			?= $(HOST_PREFIX)g++
HOST_LD				?= $(HOST_PREFIX)gcc
HOST_AR				?= $(HOST_PREFIX)ar
HOST_AS				?= $(HOST_PREFIX)as
HOST_OBJCOPY		?= $(HOST_PREFIX)objcopy
HOST_OBJDUMP		?= $(HOST_PREFIX)objdump

PYTHON3 ?= python3
DOT		?= dot

CMSIS_DIR_ABS 		:= $(abspath $(CMSIS_DIR))
MSPDEBUG_DIR_ABS 	:= $(abspath $(MSPDEBUG_DIR))
LIBSODIUM_DIR_ABS	:= $(abspath $(LIBSODIUM_DIR))
TINYAES_DIR_ABS		:= $(abspath $(TINYAES_DIR))
MUSL_DIR_ABS		:= $(abspath $(MUSL_DIR))

ARCH_FLAGS		?= -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16
SYSTEM_FLAGS	?= -nostdlib -ffreestanding -nostartfiles

#CFLAGS				+= -I$(abspath musl_include_shims)
INCLUDES			+= -I$(CUBE_CMSIS_DIR)/Include -I$(CMSIS_DIR)/CMSIS/Core/Include
INCLUDES			+= -Itinyprintf -I$(TINYALLOC_DIR) -Iinclude/platform
MBEDTLS_CONFIG_INCLUDE := -I$(realpath include) -DMBEDTLS_CONFIG_FILE='<tb_mbedtls_config.h>'
COMMON_INCLUDES		+= -I$(BUILDDIR) -Isrc $(MBEDTLS_CONFIG_INCLUDE) -I$(MBEDTLS_DIR)/include

COMMON_CFLAGS	+= -O0 -std=gnu11 -g3 -DSTM32F407xx -DSTM32F4 -DDEBUG=$(DEBUG) -DMBEDTLS_ALLOW_PRIVATE_ACCESS
CFLAGS			+= $(ARCH_FLAGS) $(SYSTEM_FLAGS)
#SIM_CFLAGS		+= -mthumb -mcpu=cortex-m4 -mfloat-abi=soft
CFLAGS			+= -fno-common -ffunction-sections -fdata-sections

# for musl
CFLAGS			+= -Dhidden= 

SIM_CFLAGS	+= -lm -DSIMULATION
SIM_CFLAGS	+= -Wall -Wextra -Wpedantic -Wshadow -Wimplicit-function-declaration -Wundef -Wno-unused-parameter

INT_CFLAGS	+= -Wall -Wextra -Wpedantic -Wshadow -Wimplicit-function-declaration -Wundef -Wno-unused-parameter
INT_CFLAGS	+= -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes

CXXFLAGS	+= -Os -g
CXXFLAGS	+= $(ARCH_FLAGS) $(SYSTEM_FLAGS)
CXXFLAGS	+= -fno-common -ffunction-sections -fdata-sections
CXXFLAGS	+= -Wall -Wextra -Wshadow -Wundef -Wredundant-decls

LDFLAGS			+= $(ARCH_FLAGS) $(SYSTEM_FLAGS)

LIBS		+= -lgcc
LDFLAGS		+= -Wl,--gc-sections

LINKMEM_FLAGS ?= --trim-stubs=startup_stm32f407xx.o --trace-sections .isr_vector --highlight-subdirs $(BUILDDIR)

OBJS := $(addprefix $(BUILDDIR)/,$(C_SOURCES:.c=.o) $(CXX_SOURCES:.cpp=.o))

ALL_OBJS := $(OBJS)
ALL_OBJS += $(BUILDDIR)/src/startup_stm32f407xx.o
ALL_OBJS += $(BUILDDIR)/src/system_stm32f4xx.o

########################################################################################################################
# Rules
########################################################################################################################

all: binsize

.PHONY: binsize
binsize: $(BUILDDIR)/$(BINARY) $(BUILDDIR)/$(BINARY:.elf=-symbol-sizes.pdf)
	$(LD) -T$(LDSCRIPT) $(LDFLAGS) -Wl,--print-memory-usage -o /dev/null $(ALL_OBJS) $(BUILDDIR)/libmbedcrypto.a $(LIBS)
	@echo
	@echo "▐▬▬▬▌ SyMbOL sIzE HiGhScORe LiSt ▐▬▬▬▌"
	$(NM) --print-size --size-sort --radix=d $< | tail -n 20

# $(BUILDDIR)/generated/dsss_butter_filter.h
$(BUILDDIR)/generated: ; mkdir -p $@

.PRECIOUS: $(BUILDDIR)/$(BINARY) 
$(BUILDDIR)/$(BINARY) $(BUILDDIR)/$(BINARY:.elf=.map) &: $(ALL_OBJS) $(BUILDDIR)/libmbedcrypto.a
	$(LD) -T$(LDSCRIPT) $(LDFLAGS) -o $@ -Wl,-Map=$(BUILDDIR)/$(BINARY:.elf=.map) $^ $(LIBS)

$(BUILDDIR)/libmbedcrypto.a:
	make -C $(MBEDTLS_DIR) clean
	make -C $(MBEDTLS_DIR) CC=$(CC) LD=$(LD) CFLAGS="$(CFLAGS) $(COMMON_CFLAGS) $(MBEDTLS_CONFIG_INCLUDE) -w" LDFLAGS="$(LDFLAGS)" lib
	mv $(MBEDTLS_DIR)/library/libmbedcrypto.a $@

$(BUILDDIR)/test/libmbedcrypto.a:
	mkdir -p $(@D)
	make -C $(MBEDTLS_DIR) clean
	make -C $(MBEDTLS_DIR) CC=$(HOST_CC) LD=$(HOST_LD) CFLAGS="$(COMMON_CFLAGS) $(MBEDTLS_CONFIG_INCLUDE) -w" LDFLAGS="$(COMMON_LDFLAGS)" lib
	mv $(MBEDTLS_DIR)/library/libmbedcrypto.a $@

build/test/cage_test: src/cage.c src/bech32.c src/cage_base64.c $(BUILDDIR)/test/libmbedcrypto.a
	$(HOST_CC) $(COMMON_CFLAGS) $(COMMON_LDFLAGS) $(COMMON_INCLUDES) -DCAGE_DEBUG -o $@ $^

build/$(BINARY:.elf=-symbol-sizes.dot): $(ALL_OBJS) $(BUILDDIR)/libmbedcrypto.a
	$(PYTHON3) tools/linkmem.py $(LINKMEM_FLAGS) $(LD) -T$(LDSCRIPT) $(LDFLAGS) $^ $(LIBS) > $@

%.pdf: %.dot
	$(DOT) -T pdf $< -o $@

%.dot: %.elf
	r2 -a arm -qc 'aa;agRd' $< 2>/dev/null >$@

$(BUILDDIR)/src/%.o: src/%.s
	mkdir -p $(@D)
	$(CC) $(COMMON_CFLAGS) $(CFLAGS) $(INT_CFLAGS) $(INCLUDES) $(COMMON_INCLUDES) -o $@ -c $<

$(BUILDDIR)/src/%.o: src/%.c
	mkdir -p $(@D)
	$(CC) $(COMMON_CFLAGS) $(CFLAGS) $(INT_CFLAGS) $(INCLUDES) $(COMMON_INCLUDES) -o $@ -c $<

$(BUILDDIR)/src/%.o: src/%.cpp
	mkdir -p $(@D)
	$(CXX) $(CXXFLAGS) -o $@ -c $<

$(BUILDDIR)/generated/%.o: $(BUILDDIR)/generated/%.c
	mkdir -p $(@D)
	$(CC) $(COMMON_CFLAGS) $(CFLAGS) $(INT_CFLAGS) $(INCLUDES) $(COMMON_INCLUDES) -o $@ -c $<

$(BUILDDIR)/%.o: %.c
	mkdir -p $(@D)
	$(CC) $(COMMON_CFLAGS) $(CFLAGS) $(EXT_CFLAGS) $(INCLUDES) $(COMMON_INCLUDES) -o $@ -c $<

clean:
	make -C $(MBEDTLS_DIR) clean
	rm -rf $(BUILDDIR)/src
	rm -rf $(BUILDDIR)/generated
	rm -f $(BUILDDIR)/libmbedcrypto.a
	rm -f $(BUILDDIR)/$(BINARY)
	rm -f $(BUILDDIR)/$(BINARY:.elf=.map)
	rm -f $(BUILDDIR)/$(BINARY:.elf=-symbol-sizes.dot)
	rm -f $(BUILDDIR)/$(BINARY:.elf=-symbol-sizes.pdf)

mrproper: clean
	rm -rf build

.PHONY: clean mrproper

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