# Options.

# HOST_PLATFORM - Which platform we're building on.
#
# Determined automatically if not specified on command line.
#
# Supported values:
# * i686-windows
# * i686-linux

HOST_PLATFORM ?=

# TARGET_PLATFORM - Which platform to build for.
#
# Determined from HOST_PLATFORM if not specified on command line.
#
# Supported values:
# * i686-windows
# * i686-linux

TARGET_PLATFORM ?=

# ROMID - The ROM version to use.
#
# Can be set in your environment using
#     $ export ROMID=...
#
# Supported values:
#  * ntsc-final

ROMID ?= ntsc-final

# GCC_OPT_LVL - the optimisation level if building with gcc.
#
# Supported values: -O0, -O1, -O2, -O3, -Os, -Og

GCC_OPT_LVL = -O0

# ROM_SIZE - The desired ROM size in megabytes.
#
# All versions of the retail ROM are 32MB.
#
# If this is too low you might get this error from ld:
# "final link failed: memory exhausted"

ROM_SIZE := 32

# DEBUG - Enable (1) or disable (0) the debug menu and crash screen.
#
# When enabled, press C-up and C-down simultaneously to toggle the debug menu.
# Note that some emulators have problems displaying the crash screen text.

DEBUG = 0

################################################################################

# Detect host platform if not specified.
ifeq ($(HOST_PLATFORM),)
  ifeq ($(OS),Windows_NT)
    # assume msys for now
    UNAME_OS := $(shell uname -s)
    ifneq (,$(findstring MINGW64,$(UNAME_OS)))
      HOST_PLATFORM := x86_64-windows
    else
      HOST_PLATFORM := i686-windows
    endif
  else # TODO
    UNAME_ARCH := $(shell uname -m)
    UNAME_OS := $(shell uname -s)
    UNAME_OS := $(shell echo $(UNAME_OS) | tr A-Z a-z)
    HOST_PLATFORM := $(UNAME_ARCH)-$(UNAME_OS)
  endif
endif

# Set target platform to host platform if not specified.
ifeq ($(TARGET_PLATFORM),)
  TARGET_PLATFORM := $(HOST_PLATFORM)
endif

ifeq (,$(findstring clean,$(MAKECMDGOALS)))
  $(info Host platform: $(HOST_PLATFORM))
  $(info Target platform: $(TARGET_PLATFORM))
endif

# Set whether the target arch is 64- or 32-bit.
ifneq (,$(findstring 64,$(TARGET_PLATFORM))$(findstring armv8,$(TARGET_PLATFORM)))
  # TODO: we're not 64-bit compatible yet, error out if building the actual game
  ifeq (,$(findstring clean,$(MAKECMDGOALS)))
    $(error 64-bit target platforms are not supported yet)
  endif
  TARGET_64BIT = 1
else # TODO
  TARGET_64BIT = 0
endif

# Set whether the target is big-endian or little-endian.
TARGET_BIG_ENDIAN = 0 # TODO

# The VERSION constant is used in the source to handle version-specific code.
ifeq ($(ROMID),ntsc-final)
  VERSION = 2
else
  $(error ROM version $(VERSION) is not supported)
endif

VERSION_HASH := $(shell git rev-parse --short HEAD)
VERSION_TARGET := $(TARGET_PLATFORM)
VERSION_ROMID := $(ROMID)

DEFINES := \
  VERSION=$(VERSION) \
  VERSION_HASH=\"$(VERSION_HASH)\" \
  VERSION_TARGET=\"$(VERSION_TARGET)\" \
  VERSION_ROMID=\"$(VERSION_ROMID)\" \
  MATCHING=0 \
  PAL=0 \
  PIRACYCHECKS=0 \
  ROM_SIZE=$(ROM_SIZE) \
  _LANGUAGE_C=1

ifeq ($(DEBUG),1)
  DEFINES := $(DEFINES) DEBUG=1
endif

C_DEFINES := $(foreach d,$(DEFINES),-D$(d))

A_DIR := src/assets/$(ROMID)
B_DIR := build/$(ROMID)-port
G_DIR := src/generated/$(ROMID)

ifneq (,$(findstring windows,$(TARGET_PLATFORM)))
  TARGET_CFLAGS := $(shell pkg-config sdl2 --cflags-only-I)
  TARGET_LDFLAGS := $(shell pkg-config sdl2 --libs) -lz -lopengl32 -static-libstdc++
  # on windows/mingw we need this to be built with a 32-bit compiler so it finds the correct libs
  TOOLCHAIN := i686-w64-mingw32-
else # TODO
  TARGET_CFLAGS := $(shell pkg-config sdl2 --cflags-only-I)
  TARGET_LDFLAGS := $(shell pkg-config sdl2 --libs) -lGL -lz
endif

# On x86_64 gcc add -m32 to CFLAGS if building a 32-bit executable.
ifneq (,$(findstring x86_64,$(HOST_PLATFORM))$(findstring x86_64,$(TOOLCHAIN)))
  ifneq (1,$(TARGET_64BIT))
    TARGET_CFLAGS += -m32
  endif
endif

# These are still used in the port, but only to generate headers.
JSON_FILES := $(shell find $(A_DIR) -path '*/lang/*.json')
JSON_FILES += $(shell find $(A_DIR) -path '*/pads/*.json')
JSON_FILES += $(shell find $(A_DIR) -path '*/tiles/*.json')
JSON_FILES += $(wildcard $(A_DIR)/*.json)

JSON_HEADERS := $(patsubst $(A_DIR)/%.json, $(G_DIR)/%.h, $(JSON_FILES))

C_FILES := $(shell find src/game port -name '*.c')
C_FILES := $(C_FILES) \
  $(wildcard src/lib/mp3/*.c) \
  $(wildcard src/lib/naudio/*.c) \
  $(wildcard src/lib/ultra/audio/*.c) \
  $(wildcard src/lib/ultra/gu/*.c) \
  src/lib/ultra/io/vimodentsclan1.c \
  src/lib/ultra/io/vimodepallan1.c \
  src/lib/ultra/io/vimodempallan1.c \
  src/lib/ultra/io/vitbl.c \
  $(wildcard src/lib/a*.c) \
  src/lib/base.c \
  src/lib/collision.c \
  src/lib/debughud.c \
  src/lib/dma.c \
  src/lib/fault.c \
  src/lib/joy.c \
  $(wildcard src/lib/lib_*.c) \
  src/lib/mema.c \
  src/lib/memp.c \
  src/lib/model.c \
  src/lib/modelasm_c.c \
  src/lib/mp3.c \
  src/lib/mtx_c.c \
  src/lib/mtx.c \
  src/lib/music.c \
  src/lib/path.c \
  src/lib/profile.c \
  src/lib/rdp.c \
  src/lib/rmon.c \
  src/lib/rng_c.c \
  src/lib/rzip_c.c \
  src/lib/snd.c \
  src/lib/speaker.c \
  src/lib/varsinit.c \
  src/lib/vi.c \
  src/textureconfig.c

CXX_FILES :=$(shell find port -name '*.cpp')

C_O_FILES := $(patsubst %.c, $(B_DIR)/%.o, $(C_FILES))
CXX_O_FILES := $(patsubst %.cpp, $(B_DIR)/%.o, $(CXX_FILES))

O_FILES := $(C_O_FILES) $(CXX_O_FILES)

INCLUDES = \
  -I include \
  -I include/PR \
  -I src/include \
  -I src/generated/$(ROMID) \
  -I src/lib/ultra/audio \
  -I port/include

TOOLCHAIN ?=
CC := $(TOOLCHAIN)gcc -std=c11
CXX := $(TOOLCHAIN)g++ -std=c++20
ifneq (,$(CXX_O_FILES))
  LD := $(CXX)
else
  LD := $(CC)
endif

$(C_O_FILES): OPT_LVL := $(GCC_OPT_LVL)

COMMON_CFLAGS := $(C_DEFINES) -DAVOID_UB=1 $(INCLUDES) $(TARGET_CFLAGS) -g \
  -fno-inline-functions \
  -fno-strict-aliasing \
  -funsigned-char \
  -fwrapv \
  -Wall \
  -Wno-address \
  -Wno-aggressive-loop-optimizations \
  -Wno-int-in-bool-context \
  -Wno-misleading-indentation \
  -Wno-missing-braces \
  -Wno-multichar \
  -Wno-tautological-compare \
  -Wno-unused-but-set-variable \
  -Wno-unused-value \
  -Wno-unused-variable

CFLAGS := $(COMMON_CFLAGS) -Wno-pointer-sign
CXXFLAGS := $(COMMON_CFLAGS) -Wno-unused-function
LDFLAGS := $(TARGET_LDFLAGS)

# Make ROMID available as an environment variable to all tooling.
# (We use this a lot)
export ROMID

BIN := $(B_DIR)/pd.exe

default: $(JSON_HEADERS) $(BIN)

################################################################################
# Asset Manager header generation

# Anims
$(G_DIR)/animations.h: $(A_DIR)/animations.json
	tools/assetmgr/mkanims --headers-only

# Lang
$(G_DIR)/lang/%.h: $(A_DIR)/lang/%.json
	tools/assetmgr/mklang $< en --headers-only

# Pads
$(G_DIR)/pads/%.h: $(A_DIR)/pads/%.json
	tools/assetmgr/mkpads $< --headers-only

# Sequences
$(G_DIR)/sequences.h: $(A_DIR)/sequences.json
	tools/assetmgr/mksequences --headers-only

# Textures
$(G_DIR)/textures.h: $(A_DIR)/textures.json
	tools/assetmgr/mktextures --headers-only

# Tiles
$(G_DIR)/tiles/%.h: $(A_DIR)/tiles/%.json
	tools/assetmgr/mktiles $< --headers-only

################################################################################
# Generic compilation rules

$(BIN): $(O_FILES)
	$(LD) $(COMMON_CFLAGS) $(OPT_LVL) -o $(BIN) $^ $(LDFLAGS)

$(B_DIR)/%.o: %.c
	@mkdir -p $(dir $@)
	$(CC) -c $(CFLAGS) $(OPT_LVL) -o $@ $<

$(B_DIR)/%.o: %.cpp
	@mkdir -p $(dir $@)
	$(CXX) -c $(CXXFLAGS) $(OPT_LVL) -o $@ $<

################################################################################
# Clean rules

clean:
	rm -rf build/$(ROMID)-port

allclean:
	rm -rf build/*
	rm -rf src/generated

codeclean:
	find $(B_DIR)/game $(B_DIR)/inflate $(B_DIR)/lib $(B_DIR)/port -name '*.o' -delete