# Nuke built-in rules and variables.
MAKEFLAGS += -rR
.SUFFIXES:

# Target architecture.
ARCH := x86_64

# Auto-detect cross compiler from toolchain/local/.
TOOLCHAIN_PREFIX := $(shell cd .. && pwd)/toolchain/local/bin/x86_64-elf-
ifneq ($(wildcard $(TOOLCHAIN_PREFIX)gcc),)
    CXX := $(TOOLCHAIN_PREFIX)g++
    CC  := $(TOOLCHAIN_PREFIX)gcc
else
    CXX := g++
    CC  := gcc
endif

# Compiler flags: freestanding, no stdlib, kernel-mode compatible.
override CXXFLAGS := \
    -std=gnu++20 \
    -g -O2 -pipe \
    -Wall \
    -Wextra \
    -nostdinc \
    -ffreestanding \
    -fno-stack-protector \
    -fno-stack-check \
    -fno-PIC \
    -fno-rtti \
    -fno-exceptions \
    -ffunction-sections \
    -fdata-sections \
    -m64 \
    -march=x86-64 \
    -mno-80387 \
    -mno-mmx \
    -mno-sse \
    -mno-sse2 \
    -mno-red-zone \
    -mcmodel=small \
    -I include \
    -isystem ../kernel/freestnd-c-hdrs/x86_64/include \
    -isystem ../kernel/freestnd-cxx-hdrs/x86_64/include

# Linker flags: freestanding static ELF.
override LDFLAGS := \
    -nostdlib \
    -static \
    -Wl,--build-id=none \
    -Wl,--gc-sections \
    -Wl,-m,elf_x86_64 \
    -z max-page-size=0x1000 \
    -T link.ld

# Output directory.
BINDIR := bin

# Discover all programs (each subdirectory under src/ is a program).
PROGRAMS := $(notdir $(wildcard src/*))

# Programs with custom Makefiles (built separately).
CUSTOM_BUILDS := 2048 doom fetch wiki wikipedia weather imageviewer fontpreview spreadsheet wordprocessor pdfviewer disks devexplorer installer audio music video bluetooth network terminal klog procmgr calculator desktop login shell rpgdemo paint tcc lua screenshot texteditor mandelbrot printers timezone printd printctl dialogs test_dialogs test_dl libloader libhello crashpad
SYSTEM_PROGRAMS := $(filter-out $(CUSTOM_BUILDS),$(PROGRAMS))

# Build targets: system programs go to bin/os/, apps go to bin/apps/<name>/.
TARGETS := $(addprefix $(BINDIR)/os/,$(addsuffix .elf,$(SYSTEM_PROGRAMS)))

# Man pages source directory.
MANDIR := man
MANSRC := $(wildcard $(MANDIR)/*.*)
MANDST := $(patsubst $(MANDIR)/%,$(BINDIR)/man/%,$(MANSRC))

# Web content source directory.
WWWDIR := www
WWWSRC := $(wildcard $(WWWDIR)/*.*)
WWWDST := $(patsubst $(WWWDIR)/%,$(BINDIR)/www/%,$(WWWSRC))

# CA certificate bundle.
CA_CERTS := $(BINDIR)/etc/ca-certificates.crt

# System config TOML files bundled into bin/config/.
CONFIGDIR := data/config
CONFIGSRC := $(wildcard $(CONFIGDIR)/*.toml)
CONFIGDST := $(patsubst $(CONFIGDIR)/%,$(BINDIR)/config/%,$(CONFIGSRC))

# Common shared assets (wallpapers, etc.)
COMMONKEEP := $(BINDIR)/common/.keep

.PHONY: all clean 2048 doom fetch wiki wikipedia weather imageviewer fontpreview spreadsheet wordprocessor pdfviewer disks devexplorer installer audio music video bluetooth network terminal klog procmgr calculator login desktop shell rpgdemo paint tcc lua screenshot texteditor mandelbrot printers timezone printd printctl dialogs icons fonts configs bearssl libc tls libjpeg libjpegwrite install-apps libloader libs libhello test_dialogs test_dl crashpad

all: bearssl libc libjpeg libjpegwrite tls libloader libs libhello $(TARGETS) fetch wiki wikipedia weather imageviewer fontpreview spreadsheet wordprocessor pdfviewer disks devexplorer installer audio music video bluetooth network terminal klog procmgr calculator 2048 doom rpgdemo paint tcc lua screenshot texteditor mandelbrot printers timezone printd printctl dialogs login desktop shell icons fonts install-apps test_dialogs test_dl crashpad $(MANDST) $(WWWDST) $(CA_CERTS) $(CONFIGDST) $(COMMONKEEP)

# Build BearSSL static library (cross-compiled for freestanding x86_64).
BEARSSL_INCLUDES := -isystem $(shell cd .. && pwd)/kernel/freestnd-c-hdrs/x86_64/include -isystem $(abspath include/libc)

lib/bearssl/build/libbearssl.a:
	$(MAKE) -C lib/bearssl CONF=MontaukOS \
		BEARSSL_CC="$(CC)" \
		BEARSSL_AR="$(TOOLCHAIN_PREFIX)ar" \
		BEARSSL_INCLUDES="$(BEARSSL_INCLUDES)"

bearssl: lib/bearssl/build/libbearssl.a

# Build shared libc static library.
libc:
	$(MAKE) -C lib/libc

# Build shared TLS helper library.
tls: bearssl libc
	$(MAKE) -C lib/tls

# Build libloader static library (used by test_dl).
libloader: libc
	$(MAKE) -C src/libloader

# Build shared libraries (libmath.lib etc).
libs: libloader
	$(MAKE) -C libs/libmath
	$(MAKE) -C libs/libnetworkapplet
	$(MAKE) -C libs/libprintersapplet
	$(MAKE) -C libs/libtimezonesapplet

# Build libhello shared GUI library.
libhello: libloader
	$(MAKE) -C libs/libhello

# Build fetch via its own Makefile (depends on bearssl, libc, and tls).
fetch: bearssl libc tls
	$(MAKE) -C src/fetch

# Build wiki via its own Makefile (depends on bearssl, libc, and tls).
wiki: bearssl libc tls
	$(MAKE) -C src/wiki

# Build wikipedia standalone GUI client (depends on bearssl, libc, and tls).
wikipedia: bearssl libc tls
	$(MAKE) -C src/wikipedia

# Build weather standalone GUI client (depends on bearssl, libc, and tls).
weather: bearssl libc tls
	$(MAKE) -C src/weather

# Build libjpeg static library (JPEG decoding via stb_image).
libjpeg: libc
	$(MAKE) -C lib/libjpeg

# Build libjpegwrite static library (JPEG encoding via stb_image_write).
libjpegwrite: libc
	$(MAKE) -C lib/libjpegwrite

# Build imageviewer standalone GUI client (depends on libc and libjpeg).
imageviewer: libc libjpeg
	$(MAKE) -C src/imageviewer

# Build fontpreview standalone GUI client (no library deps).
fontpreview:
	$(MAKE) -C src/fontpreview

# Build spreadsheet standalone GUI client (depends on libc and libdialogs).
spreadsheet: libc libloader dialogs
	$(MAKE) -C src/spreadsheet

# Build word processor standalone GUI client (depends on libc and libdialogs).
wordprocessor: libc libloader dialogs
	$(MAKE) -C src/wordprocessor

# Build PDF viewer standalone GUI client (depends on libc and libdialogs).
pdfviewer: libc libloader dialogs
	$(MAKE) -C src/pdfviewer

# Build disks standalone GUI tool (depends on libc).
disks: libc
	$(MAKE) -C src/disks

# Build devexplorer standalone GUI tool (depends on libc).
devexplorer: libc
	$(MAKE) -C src/devexplorer

# Build installer standalone GUI tool (depends on libc).
installer: libc
	$(MAKE) -C src/installer

# Build audio control standalone GUI tool (depends on libc).
audio: libc
	$(MAKE) -C src/audio

# Build music player standalone GUI tool (depends on libc).
music: libc
	$(MAKE) -C src/music

# Build videos standalone GUI tool (depends on libc).
video: libc
	$(MAKE) -C src/video

# Build bluetooth manager standalone GUI tool (depends on libc).
bluetooth: libc
	$(MAKE) -C src/bluetooth

# Build network manager standalone GUI tool (depends on libc).
network: libc
	$(MAKE) -C src/network

# Build terminal standalone GUI tool (depends on libc).
terminal: libc
	$(MAKE) -C src/terminal

# Build kernel log standalone GUI tool (depends on libc).
klog: libc
	$(MAKE) -C src/klog

# Build process manager standalone GUI tool (depends on libc).
procmgr: libc
	$(MAKE) -C src/procmgr

# Build calculator standalone GUI tool (depends on libc).
calculator: libc
	$(MAKE) -C src/calculator

# Build printers standalone GUI tool (depends on libc, bearssl, and tls).
printers: bearssl libc tls
	$(MAKE) -C src/printers

# Build time zone standalone GUI tool (depends on libc).
timezone: libc
	$(MAKE) -C src/timezone

# Build login screen via its own Makefile (depends on bearssl and libc).
login: bearssl libc
	$(MAKE) -C src/login

# Build shell via its own Makefile (multi-file build).
shell:
	$(MAKE) -C src/shell

# Build desktop via its own Makefile (depends on libc, libjpeg, bearssl for user.h, dialogs, and registry config files).
desktop: libc libjpeg bearssl libloader dialogs configs
	$(MAKE) -C src/desktop

# Copy SVG icons for the desktop into bin/icons/.
icons:
	../scripts/copy_icons.sh

# Copy TTF fonts for the desktop into bin/fonts/.
fonts:
	../scripts/copy_fonts.sh

# Copy default system config files into bin/config/.
configs: $(CONFIGDST)

# Build paint standalone GUI tool (depends on libc).
paint: libc
	$(MAKE) -C src/paint

# Build text editor standalone GUI app (depends on libc and libdialogs).
texteditor: libc libloader dialogs
	$(MAKE) -C src/texteditor

# Build Mandelbrot standalone GUI app (depends on libc).
mandelbrot: libc
	$(MAKE) -C src/mandelbrot

# Build 2048 standalone MTK game (depends on libc, libloader, and libdialogs).
2048: libc libloader dialogs
	$(MAKE) -C src/2048

# Build RPG demo game via its own Makefile (depends on libc).
rpgdemo: libc
	$(MAKE) -C src/rpgdemo

# Build doom via its own Makefile (depends on libc).
doom: libc
	$(MAKE) -C src/doom

# Build screenshot tool (depends on libc, libjpegwrite, libloader, and libdialogs).
screenshot: libc libjpegwrite libloader dialogs
	$(MAKE) -C src/screenshot

# Build TCC (Tiny C Compiler) via its own Makefile (depends on libc).
tcc: libc
	$(MAKE) -C src/tcc
	mkdir -p $(BINDIR)/lib/tcc/include
	cp -r src/tcc/tcc_include/* $(BINDIR)/lib/tcc/include/
	cp include/libc/*.h $(BINDIR)/lib/tcc/include/
	mkdir -p $(BINDIR)/lib/tcc/include/sys
	cp include/libc/sys/*.h $(BINDIR)/lib/tcc/include/sys/

# Build Lua interpreter and static library (depends on libc).
lua: libc
	$(MAKE) -C src/lua

# Build print spooler daemon (depends on libc, tls, and bearssl).
printd: bearssl libc tls libjpegwrite
	$(MAKE) -C src/printd

# Build print control utility (depends on libc, tls, and bearssl).
printctl: bearssl libc tls
	$(MAKE) -C src/printctl

# Build libdialogs shared library.
dialogs:
	$(MAKE) -C src/dialogs

# Build crashpad (crash reporter popup, depends on libc).
crashpad: libc
	$(MAKE) -C src/crashpad

# Build test_dl (dynamic loading test app, depends on libloader and shared libs).
test_dl: libloader libs libhello
	$(MAKE) -C src/test_dl

# Build test_dialogs (minimal libdialogs message box test).
test_dialogs: libc libloader dialogs
	$(MAKE) -C src/test_dialogs

# Install app bundles (manifests, icons, data files) into bin/apps/<name>/.
install-apps: 2048 doom rpgdemo paint spreadsheet wordprocessor weather wikipedia imageviewer fontpreview pdfviewer disks devexplorer installer audio music video bluetooth network terminal klog procmgr calculator screenshot texteditor mandelbrot printers timezone crashpad
	../scripts/install_apps.sh

# Copy man pages into bin/man/ so mkramdisk.sh picks them up.
$(BINDIR)/man/%: $(MANDIR)/%
	mkdir -p $(BINDIR)/man
	cp $< $@

# Copy web content into bin/www/ so mkramdisk.sh picks them up.
$(BINDIR)/www/%: $(WWWDIR)/%
	mkdir -p $(BINDIR)/www
	cp $< $@

# Copy CA certificate bundle into bin/etc/.
$(CA_CERTS): data/ca-certificates.crt
	mkdir -p $(BINDIR)/etc
	cp $< $@

# Copy system config files into bin/config/.
$(BINDIR)/config/%: $(CONFIGDIR)/%
	mkdir -p $(BINDIR)/config
	cp $< $@

# Ensure common assets directory exists.
$(COMMONKEEP):
	mkdir -p $(BINDIR)/common
	touch $@

# Build each system program from its source files.
$(BINDIR)/os/%.elf: src/%/main.cpp link.ld GNUmakefile
	mkdir -p $(BINDIR)/os obj/$*
	$(CXX) $(CXXFLAGS) -c src/$*/main.cpp -o obj/$*/main.o
	$(CXX) $(CXXFLAGS) $(LDFLAGS) obj/$*/main.o -o $@

clean:
	rm -rf $(BINDIR) obj
	$(MAKE) -C lib/bearssl clean
	$(MAKE) -C lib/libc clean
	$(MAKE) -C lib/libjpeg clean
	$(MAKE) -C lib/libjpegwrite clean
	$(MAKE) -C lib/tls clean
	$(MAKE) -C src/fetch clean
	$(MAKE) -C src/doom clean
	$(MAKE) -C src/login clean
	$(MAKE) -C src/shell clean
	$(MAKE) -C src/desktop clean
	$(MAKE) -C src/wikipedia clean
	$(MAKE) -C src/weather clean
	$(MAKE) -C src/imageviewer clean
	$(MAKE) -C src/fontpreview clean
	$(MAKE) -C src/spreadsheet clean
	$(MAKE) -C src/wordprocessor clean
	$(MAKE) -C src/pdfviewer clean
	$(MAKE) -C src/disks clean
	$(MAKE) -C src/devexplorer clean
	$(MAKE) -C src/installer clean
	$(MAKE) -C src/audio clean
	$(MAKE) -C src/music clean
	$(MAKE) -C src/video clean
	$(MAKE) -C src/bluetooth clean
	$(MAKE) -C src/network clean
	$(MAKE) -C src/terminal clean
	$(MAKE) -C src/klog clean
	$(MAKE) -C src/procmgr clean
	$(MAKE) -C src/calculator clean
	$(MAKE) -C src/printers clean
	$(MAKE) -C src/timezone clean
	$(MAKE) -C src/paint clean
	$(MAKE) -C src/rpgdemo clean
	$(MAKE) -C src/screenshot clean
	$(MAKE) -C src/mandelbrot clean
	$(MAKE) -C src/2048 clean
	$(MAKE) -C src/tcc clean
	$(MAKE) -C src/printd clean
	$(MAKE) -C src/printctl clean
	$(MAKE) -C src/dialogs clean
	$(MAKE) -C src/crashpad clean
	$(MAKE) -C src/libloader clean
	$(MAKE) -C libs/libmath clean
	$(MAKE) -C libs/libhello clean
	$(MAKE) -C libs/libnetworkapplet clean
	$(MAKE) -C libs/libprintersapplet clean
	$(MAKE) -C libs/libtimezonesapplet clean
	$(MAKE) -C src/test_dialogs clean
	$(MAKE) -C src/test_dl clean
