TOOLCHAIN := $(DEVKITARM)
COMPARE ?= 0

ifeq (compare,$(MAKECMDGOALS))
  COMPARE := 1
endif

# don't use dkP's base_tools anymore
# because the redefinition of $(CC) conflicts
# with when we want to use $(CC) to preprocess files
# thus, manually create the variables for the bin
# files, or use arm-none-eabi binaries on the system
# if dkP is not installed on this system

ifneq (,$(TOOLCHAIN))
ifneq ($(wildcard $(TOOLCHAIN)/bin),)
export PATH := $(TOOLCHAIN)/bin:$(PATH)
endif
endif

PREFIX := arm-none-eabi-
OBJCOPY := $(PREFIX)objcopy
AS := $(PREFIX)as
LD := $(PREFIX)ld

# note: the makefile must be set up so MODERNCC is never called
# if MODERN=0
MODERNCC := $(PREFIX)gcc

ifeq ($(OS),Windows_NT)
EXE := .exe
else
EXE :=
endif

# use arm-none-eabi-cpp for macOS
# as macOS's default compiler is clang
# and clang's preprocessor will warn on \u
# when preprocessing asm files, expecting a unicode literal
# we can't unconditionally use arm-none-eabi-cpp
# as installations which install binutils-arm-none-eabi
# don't come with it
ifneq ($(MODERN),1)
  ifeq ($(shell uname -s),Darwin)
    CPP := $(PREFIX)cpp
  else
    CPP := $(CC) -E
  endif
else
  CPP := $(PREFIX)cpp
endif

GAME_CODE  := AGBJ
MAKER_CODE := 01
REVISION   := 0

SHELL := /bin/bash -o pipefail

CPPFLAGS := -I tools/agbcc/include -I tools/agbcc -iquote include -nostdinc -undef

ROM := berry_fix.gba
OBJ_DIR := build
CC1             := tools/agbcc/bin/agbcc$(EXE)
override CFLAGS += -mthumb-interwork -Wimplicit -Wparentheses -Werror -O2 -fhex-asm


ELF = $(ROM:.gba=.elf)
MAP = $(ROM:.gba=.map)

C_SUBDIR = src
ASM_SUBDIR = asm
DATA_ASM_SUBDIR = data

C_BUILDDIR = $(OBJ_DIR)/$(C_SUBDIR)
ASM_BUILDDIR = $(OBJ_DIR)/$(ASM_SUBDIR)
DATA_ASM_BUILDDIR = $(OBJ_DIR)/$(DATA_ASM_SUBDIR)

ASFLAGS := -mcpu=arm7tdmi

LDFLAGS = -Map ../$(MAP)

SHA1 := $(shell { command -v sha1sum || command -v shasum; } 2>/dev/null) -c
GFX := tools/gbagfx/gbagfx$(EXE)
SCANINC := tools/scaninc/scaninc$(EXE)
PREPROC := tools/preproc/preproc$(EXE)
RAMSCRGEN := tools/ramscrgen/ramscrgen$(EXE)
FIX := tools/gbafix/gbafix$(EXE)

TOOLDIRS := $(filter-out tools/agbcc tools/binutils,$(wildcard tools/*))

MAKEFLAGS += --no-print-directory

# Clear the default suffixes
.SUFFIXES:
# Don't delete intermediate files
.SECONDARY:
# Delete files that weren't built properly
.DELETE_ON_ERROR:

# Secondary expansion is required for dependency variables in object rules.
.SECONDEXPANSION:

.PHONY: all rom clean compare tidy tools clean-tools payload $(TOOLDIRS)

infoshell = $(foreach line, $(shell $1 | sed "s/ /__SPACE__/g"), $(info $(subst __SPACE__, ,$(line))))

# Build tools when building the rom
# Disable dependency scanning for clean/tidy/tools
# Use a separate minimal makefile for speed
# Since we don't need to reload most of this makefile
ifeq (,$(filter-out all rom compare,$(MAKECMDGOALS)))
$(call infoshell, $(MAKE) -f make_tools.mk)
else
NODEP ?= 1
endif

# check if we need to scan dependencies based on the rule
ifeq (,$(MAKECMDGOALS))
  SCAN_DEPS ?= 1
else
  # clean, tidy, tools, clean-tools, and $(TOOLDIRS), don't even build the ROM
  ifeq (,$(filter-out clean tidy tools clean-tools $(TOOLDIRS),$(MAKECMDGOALS)))
    SCAN_DEPS ?= 0
  else
    SCAN_DEPS ?= 1
  endif
endif

ifeq ($(SCAN_DEPS),1)
C_SRCS := $(wildcard $(C_SUBDIR)/*.c $(C_SUBDIR)/*/*.c $(C_SUBDIR)/*/*/*.c)
C_OBJS := $(patsubst $(C_SUBDIR)/%.c,$(C_BUILDDIR)/%.o,$(C_SRCS))

ASM_SRCS := $(wildcard $(ASM_SUBDIR)/*.s)
ASM_OBJS := $(patsubst $(ASM_SUBDIR)/%.s,$(ASM_BUILDDIR)/%.o,$(ASM_SRCS))

DATA_ASM_SRCS := $(wildcard $(DATA_ASM_SUBDIR)/*.s)
DATA_ASM_OBJS := $(patsubst $(DATA_ASM_SUBDIR)/%.s,$(DATA_ASM_BUILDDIR)/%.o,$(DATA_ASM_SRCS))

OBJS     := $(C_OBJS) $(ASM_OBJS) $(DATA_ASM_OBJS)
# OBJS_REL := $(patsubst $(OBJ_DIR)/%,%,$(OBJS))

SUBDIRS  := $(sort $(dir $(OBJS)))

$(shell mkdir -p $(SUBDIRS))
endif

all: payload rom

tools: $(TOOLDIRS)

$(TOOLDIRS):
	@$(MAKE) -C $@

rom: $(ROM)
ifeq ($(COMPARE),1)
	@$(SHA1) rom.sha1
endif

# For contributors to make sure a change didn't affect the contents of the ROM.
compare: all

clean: tidy clean-tools
	find . \( -iname '*.1bpp' -o -iname '*.4bpp' -o -iname '*.8bpp' -o -iname '*.gbapal' -o -iname '*.lz' -o -iname '*.latfont' -o -iname '*.hwjpnfont' -o -iname '*.fwjpnfont' \) -exec rm {} +
	make -C payload clean

clean-tools:
	@$(foreach tooldir,$(TOOLDIRS),$(MAKE) clean -C $(tooldir);)

tidy:
	rm -f $(ROM) $(ELF) $(MAP)
	rm -r build/*
	make -C payload tidy

%.s: ;
%.png: ;
%.pal: ;

%.1bpp: %.png  ; $(GFX) $< $@
%.4bpp: %.png  ; $(GFX) $< $@
%.8bpp: %.png  ; $(GFX) $< $@
%.gbapal: %.pal ; $(GFX) $< $@
%.gbapal: %.png ; $(GFX) $< $@
%.lz: % ; $(GFX) $< $@
%.rl: % ; $(GFX) $< $@

ifeq ($(DINFO),1)
override CFLAGS += -g
endif

ifeq ($(SCAN_DEPS),1)
ifeq ($(NODEP),1)
$(C_BUILDDIR)/%.o: c_dep :=
else
$(C_BUILDDIR)/%.o: c_dep = $(shell $(SCANINC) -I include $(C_SUBDIR)/$*.c)
endif
endif

$(C_BUILDDIR)/%.o : $(C_SUBDIR)/%.c $$(c_dep)
	@$(CPP) $(CPPFLAGS) $< -o $(C_BUILDDIR)/$*.i
	@$(PREPROC) $(C_BUILDDIR)/$*.i "" | $(CC1) $(CFLAGS) -o $(C_BUILDDIR)/$*.s
	$(AS) $(ASFLAGS) -o $@ $(C_BUILDDIR)/$*.s

ifeq ($(SCAN_DEPS),1)
ifeq ($(NODEP),1)
$(ASM_BUILDDIR)/%.o: asm_dep :=
else
$(ASM_BUILDDIR)/%.o: asm_dep = $(shell $(SCANINC) $(ASM_SUBDIR)/$*.s)
endif
endif

$(ASM_BUILDDIR)/%.o: $(ASM_SUBDIR)/%.s $$(asm_dep)
	$(AS) $(ASFLAGS) -o $@ $<

ifeq ($(NODEP),1)
$(DATA_ASM_BUILDDIR)/%.o: data_dep :=
else
$(DATA_ASM_BUILDDIR)/%.o: data_dep = $(shell $(SCANINC) $(DATA_ASM_SUBDIR)/$*.s)
endif

payload:
	@$(MAKE) -C payload COMPARE=$(COMPARE) TOOLCHAIN=$(TOOLCHAIN) MODERN=$(MODERN)

payload/payload.gba: payload

data/payload.gba.lz: payload/payload.gba
	$(GFX) $< $@ -search 1

$(DATA_ASM_BUILDDIR)/%.o: $(DATA_ASM_SUBDIR)/%.s $$(data_dep)
	$(PREPROC) $< "" | $(CPP) -I include - | $(AS) $(ASFLAGS) -o $@

$(ELF): ld_script.txt $(OBJS)
	cd $(OBJ_DIR) && $(LD) $(LDFLAGS) -T ../ld_script.txt -o ../$@

$(ROM): $(ELF)
	$(OBJCOPY) -O binary $< $@
	$(FIX) $@ -c$(GAME_CODE) -m$(MAKER_CODE) -r$(REVISION) --silent