# port.mk - Shared rules for MontaukOS ports.
#
# There are two kinds of port.
#
# NOTE: a port must set its PORT_* variables BEFORE including this file --
# the install rules are expanded at include time.
#
# LIBRARY PORTS set PORT_LIB := 1 and install headers and a static archive
# into the shared ports sysroot at $(PORT_SYSROOT):
#
#     sysroot/include/...    public headers
#     sysroot/lib/lib<x>.a   static archive
#
# Dependent ports pick these up automatically: $(PORT_CFLAGS_COMMON) already
# includes -I $(PORT_SYSROOT_INC), so a port that needs zlib just adds
# $(PORT_SYSROOT_LIB)/libz.a to its link line. A library port declares its own
# prerequisites with PORT_DEPENDS (names only, for documentation and for the
# top-level build order).
#
# APPLICATION PORTS produce an app bundle in $(OUTDIR)/apps/<name>/ containing:
#
#     <name>.elf      the binary
#     manifest.toml   launcher metadata (name, binary, icon, category)
#     <icon>.svg      the launcher icon
#     .port           marker so the OS release step can tell ports from
#                     in-tree apps (see MontaukOS scripts/install_apps.sh)
#
# The desktop readdirs 0:/apps/ at runtime and parses each manifest.toml, so a
# bundle dropped into the ramdisk needs no changes anywhere in the OS tree.
#
# A port Makefile sets PORT_NAME, PORT_ICON and its own sources/flags, then
# includes this file and uses $(BUNDLE_DIR) as its link target directory.

MAKEFLAGS += -rR
.SUFFIXES:

# This file defines rules before the including Makefile does, so pin the
# default goal rather than letting the first bundle rule claim it.
.DEFAULT_GOAL := all

# ==== Repo root =======================================================
# Derived from this file's own location so a port builds the same whether it
# is invoked from the top-level Makefile or directly with `make -C <cat>/<port>`,
# and regardless of how deeply categories nest it.

PORT_MK_DIR   := $(patsubst %/,%,$(dir $(lastword $(MAKEFILE_LIST))))
MTKPORTS_ROOT := $(abspath $(PORT_MK_DIR)/..)

# ==== SDK location ====================================================
# Ports build against a live MontaukOS checkout rather than a copied
# sysroot, so libc/header changes are picked up without a sync step.

MONTAUKOS ?= $(HOME)/dev/MontaukOS

ifeq ($(wildcard $(MONTAUKOS)/programs/link.ld),)
    $(error MontaukOS tree not found at $(MONTAUKOS). Pass MONTAUKOS=/path/to/MontaukOS)
endif

# ==== Toolchain =======================================================

TOOLCHAIN_PREFIX := $(MONTAUKOS)/toolchain/local/bin/x86_64-montauk-

ifeq ($(wildcard $(TOOLCHAIN_PREFIX)gcc),)
    $(error x86_64-montauk toolchain not found. Run $(MONTAUKOS)/toolchain/build-montauk-toolchain.sh first)
endif

CC  := $(TOOLCHAIN_PREFIX)gcc
CXX := $(TOOLCHAIN_PREFIX)g++
AR  := $(TOOLCHAIN_PREFIX)ar
LD  := $(TOOLCHAIN_PREFIX)gcc

# ==== SDK paths =======================================================

SDK_INC     := $(MONTAUKOS)/programs/include
SDK_LIBC_INC:= $(MONTAUKOS)/programs/include/libc
SDK_LIB     := $(MONTAUKOS)/programs/lib
SDK_LINK_LD := $(MONTAUKOS)/programs/link.ld

LIBC_A      := $(SDK_LIB)/libc/liblibc.a
LIBLOADER_A := $(SDK_LIB)/libloader/liblibloader.a
LIBTLS_A    := $(SDK_LIB)/tls/libtls.a
LIBBEARSSL_A:= $(SDK_LIB)/bearssl/libbearssl.a
LIBJPEG_A   := $(SDK_LIB)/libjpeg/libjpeg.a

# The kernel ABI version this port is being built against. Recorded in the
# bundle so a stale port can be spotted after a syscall/ABI bump rather than
# crashing mysteriously at runtime.
SDK_API_VERSION := $(shell sed -n 's/.*apiVersion = \([0-9]\+\);.*/\1/p' \
                     $(MONTAUKOS)/kernel/src/Api/Info.hpp 2>/dev/null | head -1)

# ==== Output ==========================================================

OUTDIR     ?= $(MTKPORTS_ROOT)/out
OBJDIR     ?= obj

# Shared sysroot that library ports install into and every port compiles
# against. Kept separate from the MontaukOS SDK so `make clean` here never
# touches the OS tree.
PORT_SYSROOT     ?= $(MTKPORTS_ROOT)/sysroot
PORT_SYSROOT_INC := $(PORT_SYSROOT)/include
PORT_SYSROOT_LIB := $(PORT_SYSROOT)/lib

BUNDLE_DIR := $(OUTDIR)/apps/$(PORT_NAME)
TARGET     := $(BUNDLE_DIR)/$(PORT_NAME).elf

# ==== Common flags ====================================================
# Mirrors the in-tree convention: freestanding, no stdlib, linked with the
# shared program link script.

PORT_CFLAGS_COMMON := \
    -g -O2 -pipe \
    -ffreestanding \
    -fno-stack-protector \
    -fno-stack-check \
    -ffunction-sections \
    -fdata-sections \
    -msse \
    -msse2 \
    -isystem $(SDK_LIBC_INC) \
    -I $(SDK_INC) \
    -I $(PORT_SYSROOT_INC)

PORT_LDFLAGS_COMMON := \
    -nostdlib \
    -Wl,--gc-sections \
    -T $(SDK_LINK_LD)

# ==== NetSurf library ports ===========================================
# NetSurf's libraries share one buildsystem (dev-util/netsurf-buildsystem)
# and all build the same way, so the invocation lives here rather than being
# copied into each port.
#
# It cross-compiles for x86_64-montauk unpatched: HOST is auto-detected from
# `$(CC) -dumpmachine`, and BUILD != HOST puts it in cross mode. CC/AR must be
# passed on the command line (their `origin ... default` checks skip them
# otherwise), while CFLAGS must go through the ENVIRONMENT -- their makefiles
# do `CFLAGS := -I... $(CFLAGS)`, and a command-line CFLAGS would override
# that assignment outright and drop their own include paths.

NS_BUILDSYSTEM := $(MTKPORTS_ROOT)/dev-util/netsurf-buildsystem/upstream
NS_BUILDDIR    := build-montauk

NS_CFLAGS := \
    -ffreestanding \
    -fno-stack-protector \
    -fno-stack-check \
    -msse \
    -msse2 \
    -isystem $(SDK_LIBC_INC) \
    -I $(SDK_INC) \
    -I $(PORT_SYSROOT_INC)

NS_MAKE_ARGS := \
    NSSHARED=$(NS_BUILDSYSTEM) \
    CC=$(CC) \
    AR=$(AR) \
    COMPONENT_TYPE=lib-static \
    BUILDDIR=$(NS_BUILDDIR) \
    WANT_TEST=no

# MAKEFLAGS must be cleared for the sub-make. This file sets `-rR`, which
# disables built-in variables, and their buildsystem probes those with
# `ifeq ($(origin RM),default)` style tests -- under -rR the origin is
# "undefined" instead, so RM/ARFLAGS silently expand to nothing and the
# archive rule tries to *execute* the .a file (exit 127).
NS_MAKE := MAKEFLAGS= $(MAKE)

# Build a NetSurf library in $(1) (its checkout dir) and copy the archive to
# $(PORT_ARCHIVE). Usage in a recipe:  $(call ns_build,upstream,wapcaplet)
# A port may add its own flags by setting NS_CFLAGS_EXTRA (expanded at call
# time, so it can be set after this file is included).
ns_build = \
	CFLAGS="$(NS_CFLAGS) $(NS_CFLAGS_EXTRA)" $(NS_MAKE) -C $(1) $(NS_MAKE_ARGS) && \
	cp $(1)/$(NS_BUILDDIR)/lib$(2).a $(PORT_ARCHIVE)

ns_clean = $(NS_MAKE) -C $(1) $(NS_MAKE_ARGS) clean >/dev/null 2>&1 || true

ifeq ($(PORT_LIB),1)

# ==== Library ports ===================================================
# The port builds $(PORT_ARCHIVE) and lists its public headers in
# $(PORT_HEADERS); port.mk installs both into the shared sysroot. Headers
# keep any subdirectory they are named with (e.g. parserutils/parserutils.h
# installs to sysroot/include/parserutils/parserutils.h), so set
# PORT_HEADER_ROOT to the directory those paths are relative to.

PORT_HEADER_ROOT ?= include

INSTALLED_LIB     := $(PORT_SYSROOT_LIB)/$(notdir $(PORT_ARCHIVE))
INSTALLED_HEADERS := $(patsubst $(PORT_HEADER_ROOT)/%,$(PORT_SYSROOT_INC)/%,$(PORT_HEADERS))

$(INSTALLED_LIB): $(PORT_ARCHIVE)
	@mkdir -p $(dir $@)
	cp $< $@

$(PORT_SYSROOT_INC)/%: $(PORT_HEADER_ROOT)/%
	@mkdir -p $(dir $@)
	cp $< $@

.PHONY: install-lib
install-lib: $(INSTALLED_LIB) $(INSTALLED_HEADERS)
	@echo "installed lib: $(PORT_NAME) -> $(PORT_SYSROOT)"

.PHONY: clean-lib
clean-lib:
	rm -rf $(OBJDIR) $(PORT_ARCHIVE) $(INSTALLED_LIB) $(INSTALLED_HEADERS)

else

# ==== Bundle assembly =================================================
# Ports depend on $(BUNDLE_FILES) to get manifest + icon + marker staged
# alongside the ELF their link rule produces.

BUNDLE_FILES := $(BUNDLE_DIR)/manifest.toml $(BUNDLE_DIR)/.port
ifneq ($(PORT_ICON),)
    BUNDLE_FILES += $(BUNDLE_DIR)/$(PORT_ICON)
endif

$(BUNDLE_DIR)/manifest.toml: manifest.toml | $(BUNDLE_DIR)
	cp $< $@

$(BUNDLE_DIR)/$(PORT_ICON): $(PORT_ICON) | $(BUNDLE_DIR)
	cp $< $@

# Marker file consumed by the MontaukOS release step to prune ports from a
# base ISO. Carries the ABI version so mismatches are diagnosable.
$(BUNDLE_DIR)/.port: Makefile | $(BUNDLE_DIR)
	printf 'port = "%s"\napi_version = "%s"\n' '$(PORT_NAME)' '$(SDK_API_VERSION)' > $@

$(BUNDLE_DIR):
	mkdir -p $@

.PHONY: bundle
bundle: $(TARGET) $(BUNDLE_FILES)

.PHONY: clean-bundle
clean-bundle:
	rm -rf $(OBJDIR) $(BUNDLE_DIR)

endif