TOOLCHAIN := $(DEVKITARM)
COMPARE ?= 0

# 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

TITLE       := POKEMON EMER
GAME_CODE   := BPEE
MAKER_CODE  := 01
REVISION    := 0
MODERN      ?= 0

# 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

ROM_NAME := pokeemerald.gba
ELF_NAME := $(ROM_NAME:.gba=.elf)
MAP_NAME := $(ROM_NAME:.gba=.map)
OBJ_DIR_NAME := build/emerald

MODERN_ROM_NAME := pokeemerald_modern.gba
MODERN_ELF_NAME := $(MODERN_ROM_NAME:.gba=.elf)
MODERN_MAP_NAME := $(MODERN_ROM_NAME:.gba=.map)
MODERN_OBJ_DIR_NAME := build/modern

SHELL := /bin/bash -o pipefail

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

C_SUBDIR = src
GFLIB_SUBDIR = gflib
ASM_SUBDIR = asm
DATA_SRC_SUBDIR = src/data
DATA_ASM_SUBDIR = data
SONG_SUBDIR = sound/songs
MID_SUBDIR = sound/songs/midi
SAMPLE_SUBDIR = sound/direct_sound_samples
CRY_SUBDIR = sound/direct_sound_samples/cries

C_BUILDDIR = $(OBJ_DIR)/$(C_SUBDIR)
GFLIB_BUILDDIR = $(OBJ_DIR)/$(GFLIB_SUBDIR)
ASM_BUILDDIR = $(OBJ_DIR)/$(ASM_SUBDIR)
DATA_ASM_BUILDDIR = $(OBJ_DIR)/$(DATA_ASM_SUBDIR)
SONG_BUILDDIR = $(OBJ_DIR)/$(SONG_SUBDIR)
MID_BUILDDIR = $(OBJ_DIR)/$(MID_SUBDIR)

ASFLAGS := -mcpu=arm7tdmi --defsym MODERN=$(MODERN)

ifeq ($(MODERN),0)
CC1             := tools/agbcc/bin/agbcc$(EXE)
override CFLAGS += -mthumb-interwork -Wimplicit -Wparentheses -Werror -O2 -fhex-asm -g
ROM := $(ROM_NAME)
OBJ_DIR := $(OBJ_DIR_NAME)
LIBPATH := -L ../../tools/agbcc/lib
else
CC1              = $(shell $(MODERNCC) --print-prog-name=cc1) -quiet
override CFLAGS += -mthumb -mthumb-interwork -O2 -mabi=apcs-gnu -mtune=arm7tdmi -march=armv4t -fno-toplevel-reorder -Wno-pointer-to-int-cast -g
ROM := $(MODERN_ROM_NAME)
OBJ_DIR := $(MODERN_OBJ_DIR_NAME)
LIBPATH := -L "$(dir $(shell $(MODERNCC) -mthumb -print-file-name=libgcc.a))" -L "$(dir $(shell $(MODERNCC) -mthumb -print-file-name=libc.a))"
endif

CPPFLAGS := -iquote include -iquote $(GFLIB_SUBDIR) -Wno-trigraphs -DMODERN=$(MODERN)
ifneq ($(MODERN),1)
CPPFLAGS += -I tools/agbcc/include -I tools/agbcc -nostdinc -undef
endif

LDFLAGS = -Map ../../$(MAP)

LIB := $(LIBPATH) -lgcc -lc -L../../libagbsyscall -lagbsyscall

SHA1 := $(shell { command -v sha1sum || command -v shasum; } 2>/dev/null) -c
GFX := tools/gbagfx/gbagfx$(EXE)
AIF := tools/aif2pcm/aif2pcm$(EXE)
MID := tools/mid2agb/mid2agb$(EXE)
SCANINC := tools/scaninc/scaninc$(EXE)
PREPROC := tools/preproc/preproc$(EXE)
RAMSCRGEN := tools/ramscrgen/ramscrgen$(EXE)
FIX := tools/gbafix/gbafix$(EXE)
MAPJSON := tools/mapjson/mapjson$(EXE)
JSONPROC := tools/jsonproc/jsonproc$(EXE)

TOOLDIRS := $(filter-out tools/agbcc tools/binutils,$(wildcard tools/*))
TOOLBASE = $(TOOLDIRS:tools/%=%)
TOOLS = $(foreach tool,$(TOOLBASE),tools/$(tool)/$(tool)$(EXE))

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 mostlyclean clean-tools $(TOOLDIRS) berry_fix libagbsyscall modern tidymodern tidynonmodern

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
ifeq (,$(filter-out all rom compare modern berry_fix libagbsyscall,$(MAKECMDGOALS)))
$(call infoshell, $(MAKE) tools)
else
NODEP := 1
endif

C_SRCS_IN := $(wildcard $(C_SUBDIR)/*.c $(C_SUBDIR)/*/*.c $(C_SUBDIR)/*/*/*.c)
C_SRCS := $(foreach src,$(C_SRCS_IN),$(if $(findstring .inc.c,$(src)),,$(src)))
C_OBJS := $(patsubst $(C_SUBDIR)/%.c,$(C_BUILDDIR)/%.o,$(C_SRCS))

GFLIB_SRCS := $(wildcard $(GFLIB_SUBDIR)/*.c)
GFLIB_OBJS := $(patsubst $(GFLIB_SUBDIR)/%.c,$(GFLIB_BUILDDIR)/%.o,$(GFLIB_SRCS))

C_ASM_SRCS += $(wildcard $(C_SUBDIR)/*.s $(C_SUBDIR)/*/*.s $(C_SUBDIR)/*/*/*.s)
C_ASM_OBJS := $(patsubst $(C_SUBDIR)/%.s,$(C_BUILDDIR)/%.o,$(C_ASM_SRCS))

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

# get all the data/*.s files EXCEPT the ones with specific rules
REGULAR_DATA_ASM_SRCS := $(filter-out $(DATA_ASM_SUBDIR)/maps.s $(DATA_ASM_SUBDIR)/map_events.s, $(wildcard $(DATA_ASM_SUBDIR)/*.s))

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

SONG_SRCS := $(wildcard $(SONG_SUBDIR)/*.s)
SONG_OBJS := $(patsubst $(SONG_SUBDIR)/%.s,$(SONG_BUILDDIR)/%.o,$(SONG_SRCS))

MID_SRCS := $(wildcard $(MID_SUBDIR)/*.mid)
MID_OBJS := $(patsubst $(MID_SUBDIR)/%.mid,$(MID_BUILDDIR)/%.o,$(MID_SRCS))

OBJS     := $(C_OBJS) $(GFLIB_OBJS) $(C_ASM_OBJS) $(ASM_OBJS) $(DATA_ASM_OBJS) $(SONG_OBJS) $(MID_OBJS)
OBJS_REL := $(patsubst $(OBJ_DIR)/%,%,$(OBJS))

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

AUTO_GEN_TARGETS :=

$(shell mkdir -p $(SUBDIRS))

all: 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: ; @$(MAKE) COMPARE=1

clean: mostlyclean clean-tools

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

mostlyclean: tidynonmodern tidymodern
	rm -f $(SAMPLE_SUBDIR)/*.bin
	rm -f $(CRY_SUBDIR)/*.bin
	rm -f $(MID_SUBDIR)/*.s
	find . \( -iname '*.1bpp' -o -iname '*.4bpp' -o -iname '*.8bpp' -o -iname '*.gbapal' -o -iname '*.lz' -o -iname '*.rl' -o -iname '*.latfont' -o -iname '*.hwjpnfont' -o -iname '*.fwjpnfont' \) -exec rm {} +
	rm -f $(DATA_ASM_SUBDIR)/layouts/layouts.inc $(DATA_ASM_SUBDIR)/layouts/layouts_table.inc
	rm -f $(DATA_ASM_SUBDIR)/maps/connections.inc $(DATA_ASM_SUBDIR)/maps/events.inc $(DATA_ASM_SUBDIR)/maps/groups.inc $(DATA_ASM_SUBDIR)/maps/headers.inc
	find $(DATA_ASM_SUBDIR)/maps \( -iname 'connections.inc' -o -iname 'events.inc' -o -iname 'header.inc' \) -exec rm {} +
	rm -f $(AUTO_GEN_TARGETS)
	@$(MAKE) clean -C berry_fix
	@$(MAKE) clean -C libagbsyscall

tidy:
	rm -f $(ROM) $(ELF) $(MAP)
	rm -r $(OBJ_DIR)

tidynonmodern:
	rm -f $(ROM_NAME) $(ELF_NAME) $(MAP_NAME)
	rm -rf $(OBJ_DIR_NAME)

tidymodern:
	rm -f $(MODERN_ROM_NAME) $(MODERN_ELF_NAME) $(MODERN_MAP_NAME)
	rm -rf $(MODERN_OBJ_DIR_NAME)
	
ifneq ($(MODERN),0)
$(C_BUILDDIR)/berry_crush.o: override CFLAGS += -Wno-address-of-packed-member
endif

include graphics_file_rules.mk
include map_data_rules.mk
include spritesheet_rules.mk
include json_data_rules.mk
include songs.mk

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

%.1bpp: %.png  ; $(GFX) $< $@
%.4bpp: %.png  ; $(GFX) $< $@
%.8bpp: %.png  ; $(GFX) $< $@
%.gbapal: %.pal ; $(GFX) $< $@
%.gbapal: %.png ; $(GFX) $< $@
%.lz: % ; $(GFX) $< $@
%.rl: % ; $(GFX) $< $@
$(CRY_SUBDIR)/%.bin: $(CRY_SUBDIR)/%.aif ; $(AIF) $< $@ --compress
sound/%.bin: sound/%.aif ; $(AIF) $< $@


ifeq ($(MODERN),0)
$(C_BUILDDIR)/libc.o: CC1 := tools/agbcc/bin/old_agbcc$(EXE)
$(C_BUILDDIR)/libc.o: CFLAGS := -O2

$(C_BUILDDIR)/siirtc.o: CFLAGS := -mthumb-interwork

$(C_BUILDDIR)/agb_flash.o: CFLAGS := -O -mthumb-interwork
$(C_BUILDDIR)/agb_flash_1m.o: CFLAGS := -O -mthumb-interwork
$(C_BUILDDIR)/agb_flash_mx.o: CFLAGS := -O -mthumb-interwork

$(C_BUILDDIR)/m4a.o: CC1 := tools/agbcc/bin/old_agbcc$(EXE)

$(C_BUILDDIR)/record_mixing.o: CFLAGS += -ffreestanding
$(C_BUILDDIR)/librfu_intr.o: CC1 := tools/agbcc/bin/agbcc_arm$(EXE)
$(C_BUILDDIR)/librfu_intr.o: CFLAGS := -O2 -mthumb-interwork -quiet
else
$(C_BUILDDIR)/librfu_intr.o: CFLAGS := -mthumb-interwork -O2 -mabi=apcs-gnu -mtune=arm7tdmi -march=armv4t -fno-toplevel-reorder -Wno-pointer-to-int-cast
endif

ifeq ($(NODEP),1)
$(C_BUILDDIR)/%.o: c_dep :=
else
$(C_BUILDDIR)/%.o: c_dep = $(shell [[ -f $(C_SUBDIR)/$*.c ]] && $(SCANINC) -I include -I tools/agbcc/include -I gflib $(C_SUBDIR)/$*.c)
endif

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

$(C_BUILDDIR)/%.o : $(C_SUBDIR)/%.c $$(c_dep)
	@$(CPP) $(CPPFLAGS) $< -o $(C_BUILDDIR)/$*.i
	@$(PREPROC) $(C_BUILDDIR)/$*.i charmap.txt | $(CC1) $(CFLAGS) -o $(C_BUILDDIR)/$*.s
	@echo -e ".text\n\t.align\t2, 0\n" >> $(C_BUILDDIR)/$*.s
	$(AS) $(ASFLAGS) -o $@ $(C_BUILDDIR)/$*.s

ifeq ($(NODEP),1)
$(GFLIB_BUILDDIR)/%.o: c_dep :=
else
$(GFLIB_BUILDDIR)/%.o: c_dep = $(shell [[ -f $(GFLIB_SUBDIR)/$*.c ]] && $(SCANINC) -I include -I tools/agbcc/include -I gflib $(GFLIB_SUBDIR)/$*.c)
endif

$(GFLIB_BUILDDIR)/%.o : $(GFLIB_SUBDIR)/%.c $$(c_dep)
	@$(CPP) $(CPPFLAGS) $< -o $(GFLIB_BUILDDIR)/$*.i
	@$(PREPROC) $(GFLIB_BUILDDIR)/$*.i charmap.txt | $(CC1) $(CFLAGS) -o $(GFLIB_BUILDDIR)/$*.s
	@echo -e ".text\n\t.align\t2, 0\n" >> $(GFLIB_BUILDDIR)/$*.s
	$(AS) $(ASFLAGS) -o $@ $(GFLIB_BUILDDIR)/$*.s

ifeq ($(NODEP),1)
$(C_BUILDDIR)/%.o: c_asm_dep :=
else
$(C_BUILDDIR)/%.o: c_asm_dep = $(shell [[ -f $(C_SUBDIR)/$*.s ]] && $(SCANINC) -I "" $(C_SUBDIR)/$*.s)
endif

$(C_BUILDDIR)/%.o: $(C_SUBDIR)/%.s $$(c_asm_dep)
	$(AS) $(ASFLAGS) -o $@ $<

# The dep rules have to be explicit or else missing files won't be reported.
# As a side effect, they're evaluated immediately instead of when the rule is invoked.
# It doesn't look like $(shell) can be deferred so there might not be a better way.


ifeq ($(NODEP),1)
$(ASM_BUILDDIR)/%.o: $(ASM_SUBDIR)/%.s
	$(AS) $(ASFLAGS) -o $@ $<
else
define ASM_DEP
$1: $2 $$(shell $(SCANINC) -I include -I "" $2)
	$$(AS) $$(ASFLAGS) -o $$@ $$<
endef
$(foreach src, $(ASM_SRCS), $(eval $(call ASM_DEP,$(patsubst $(ASM_SUBDIR)/%.s,$(ASM_BUILDDIR)/%.o, $(src)),$(src))))
endif

ifeq ($(NODEP),1)
$(DATA_ASM_BUILDDIR)/%.o: $(DATA_ASM_SUBDIR)/%.s
	$(PREPROC) $< charmap.txt | $(CPP) -I include - | $(AS) $(ASFLAGS) -o $@
else
define DATA_ASM_DEP
$1: $2 $$(shell $(SCANINC) -I include -I "" $2)
	$$(PREPROC) $$< charmap.txt | $$(CPP) -I include - | $$(AS) $$(ASFLAGS) -o $$@
endef
$(foreach src, $(REGULAR_DATA_ASM_SRCS), $(eval $(call DATA_ASM_DEP,$(patsubst $(DATA_ASM_SUBDIR)/%.s,$(DATA_ASM_BUILDDIR)/%.o, $(src)),$(src))))
endif

$(SONG_BUILDDIR)/%.o: $(SONG_SUBDIR)/%.s
	$(AS) $(ASFLAGS) -I sound -o $@ $<

$(OBJ_DIR)/sym_bss.ld: sym_bss.txt
	$(RAMSCRGEN) .bss $< ENGLISH > $@

$(OBJ_DIR)/sym_common.ld: sym_common.txt $(C_OBJS) $(wildcard common_syms/*.txt)
	$(RAMSCRGEN) COMMON $< ENGLISH -c $(C_BUILDDIR),common_syms > $@

$(OBJ_DIR)/sym_ewram.ld: sym_ewram.txt
	$(RAMSCRGEN) ewram_data $< ENGLISH > $@

ifeq ($(MODERN),0)
LD_SCRIPT := ld_script.txt
LD_SCRIPT_DEPS := $(OBJ_DIR)/sym_bss.ld $(OBJ_DIR)/sym_common.ld $(OBJ_DIR)/sym_ewram.ld
else
LD_SCRIPT := ld_script_modern.txt
LD_SCRIPT_DEPS := 
endif

$(OBJ_DIR)/ld_script.ld: $(LD_SCRIPT) $(LD_SCRIPT_DEPS)
	cd $(OBJ_DIR) && sed "s#tools/#../../tools/#g" ../../$(LD_SCRIPT) > ld_script.ld

$(ELF): $(OBJ_DIR)/ld_script.ld $(OBJS) berry_fix libagbsyscall
	@echo "cd $(OBJ_DIR) && $(LD) $(LDFLAGS) -T ld_script.ld -o ../../$@ <objects> <lib>"
	@cd $(OBJ_DIR) && $(LD) $(LDFLAGS) -T ld_script.ld -o ../../$@ $(OBJS_REL) $(LIB)
	$(FIX) $@ -t"$(TITLE)" -c$(GAME_CODE) -m$(MAKER_CODE) -r$(REVISION) --silent

$(ROM): $(ELF)
	$(OBJCOPY) -O binary $< $@
	$(FIX) $@ -p --silent

modern: ; @$(MAKE) MODERN=1

berry_fix/berry_fix.gba: berry_fix

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

libagbsyscall:
	@$(MAKE) -C libagbsyscall TOOLCHAIN=$(TOOLCHAIN) MODERN=$(MODERN)