# SPDX-License-Identifier: AGPL-3.0-or-later
# Source-only build rules for the in-tree libzuptsdk compatibility SDK.

SDK_VERSION_MAJOR = 1
SDK_VERSION_MINOR = 0
SDK_VERSION_PATCH = 0
SDK_SOVERSION = $(SDK_VERSION_MAJOR)
SDK_FULLVERSION = $(SDK_VERSION_MAJOR).$(SDK_VERSION_MINOR).$(SDK_VERSION_PATCH)

SDK_HDR = sdk/include/zuptsdk.h
SDK_SRC = sdk/src/zuptsdk.c
SDK_MAP = sdk/zuptsdk.map
SDK_BUILD_DIR = sdk/build
SDK_PKGCONFIGDIR ?= $(LIBDIR)/pkgconfig
SDK_LICENSEDIR ?= $(PREFIX)/share/licenses/libzuptsdk
SDK_LICENSE_FILES = LICENSE LICENSE-AGPL-3.0 LICENSE-GPL-3.0 \
	LICENSE-BSD-2-Clause LICENSE-BSD-3-Clause LICENSE-CC0-1.0 \
	NOTICE THIRD-PARTY-NOTICES.md

# All implementation sources are rebuilt from source as PIC. Objects are kept
# separate from the CLI build so `make -j` may build both safely.
SDK_PIC_OBJS = $(patsubst src/%.c,$(SDK_BUILD_DIR)/%.o,$(filter-out src/zupt_main.c,$(ZUPT_SOURCES)))
SDK_PIC_OBJS += $(patsubst src/%.c,$(SDK_BUILD_DIR)/%.o,$(VV_SOURCES))
SDK_PIC_OBJS += $(SDK_BUILD_DIR)/zuptsdk.o
SDK_PROJECT_CPPFLAGS = -DZUPT_BUILDING_SDK=1 -Isdk/include
SDK_PROJECT_CFLAGS = -fPIC
SDK_SHARED_LDFLAGS ?= -shared \
	-Wl,-soname,libzuptsdk.so.$(SDK_SOVERSION) \
	-Wl,--version-script,$(SDK_MAP)
SDK_PC_PRIVATE_LIBS ?= $(PROJECT_LDLIBS)

SDK_SHARED = $(SDK_BUILD_DIR)/libzuptsdk.so.$(SDK_FULLVERSION)
SDK_SHARED_SO = $(SDK_BUILD_DIR)/libzuptsdk.so.$(SDK_SOVERSION)
SDK_SHARED_LINK = $(SDK_BUILD_DIR)/libzuptsdk.so
SDK_STATIC = $(SDK_BUILD_DIR)/libzuptsdk.a
SDK_PC = $(SDK_BUILD_DIR)/zuptsdk.pc

$(SDK_BUILD_DIR):
	$(Q)mkdir -p "$@"

# Keep ISA flags on the SHA-NI translation unit only. Runtime dispatch in the
# baseline SHA-256 implementation prevents execution on unsupported CPUs.
$(SDK_BUILD_DIR)/zupt_sha256_shani.o: src/zupt_sha256_shani.c $(HEADERS) | $(SDK_BUILD_DIR)
	$(Q)$(CC) $(CPPFLAGS) $(PROJECT_CPPFLAGS) $(SDK_PROJECT_CPPFLAGS) \
		$(CFLAGS) $(PROJECT_CFLAGS) $(SDK_PROJECT_CFLAGS) $(SHANI_FLAGS) -c -o $@ $<

$(SDK_BUILD_DIR)/vv_%.o: src/vv_%.c $(HEADERS) | $(SDK_BUILD_DIR)
	$(Q)$(CC) $(CPPFLAGS) $(PROJECT_CPPFLAGS) $(SDK_PROJECT_CPPFLAGS) \
		$(CFLAGS) $(PROJECT_CFLAGS) $(SDK_PROJECT_CFLAGS) $(VV_WARNING_FLAGS) \
		$(if $(filter $(SDK_BUILD_DIR)/vv_decoder.o,$@),$(VV_DECODER_WARNING_FLAGS)) -c -o $@ $<

$(SDK_BUILD_DIR)/vaptvupt_api.o: src/vaptvupt_api.c $(HEADERS) | $(SDK_BUILD_DIR)
	$(Q)$(CC) $(CPPFLAGS) $(PROJECT_CPPFLAGS) $(SDK_PROJECT_CPPFLAGS) \
		$(CFLAGS) $(PROJECT_CFLAGS) $(SDK_PROJECT_CFLAGS) $(VV_WARNING_FLAGS) -c -o $@ $<

$(SDK_BUILD_DIR)/%.o: src/%.c $(HEADERS) | $(SDK_BUILD_DIR)
	$(Q)$(CC) $(CPPFLAGS) $(PROJECT_CPPFLAGS) $(SDK_PROJECT_CPPFLAGS) \
		$(CFLAGS) $(PROJECT_CFLAGS) $(SDK_PROJECT_CFLAGS) -c -o $@ $<

$(SDK_BUILD_DIR)/zuptsdk.o: $(SDK_SRC) $(SDK_HDR) $(HEADERS) | $(SDK_BUILD_DIR)
	$(Q)$(CC) $(CPPFLAGS) $(PROJECT_CPPFLAGS) $(SDK_PROJECT_CPPFLAGS) \
		$(CFLAGS) $(PROJECT_CFLAGS) $(SDK_PROJECT_CFLAGS) -c -o $@ $<

$(SDK_SHARED): $(SDK_PIC_OBJS) $(SDK_MAP) $(JAZZ_O)
	@echo "[sdk-shared] $@"
	$(Q)$(CC) $(CFLAGS) $(PROJECT_CFLAGS) $(SDK_PROJECT_CFLAGS) \
		$(LDFLAGS) $(PROJECT_LDFLAGS) $(SDK_SHARED_LDFLAGS) \
		$(SDK_PIC_OBJS) $(JAZZ_O) -o $@ $(PROJECT_LDLIBS) $(LDLIBS)
	$(Q)cd "$(SDK_BUILD_DIR)" && ln -sf "$(notdir $(SDK_SHARED))" "$(notdir $(SDK_SHARED_SO))"
	$(Q)cd "$(SDK_BUILD_DIR)" && ln -sf "$(notdir $(SDK_SHARED_SO))" "$(notdir $(SDK_SHARED_LINK))"

$(SDK_STATIC): $(SDK_PIC_OBJS) $(JAZZ_O)
	@echo "[sdk-static] $@"
	$(Q)$(AR) $(ARFLAGS) $@ $(SDK_PIC_OBJS) $(JAZZ_O)
	$(Q)$(RANLIB) $@

$(SDK_PC): $(SDK_HDR) | $(SDK_BUILD_DIR)
	@echo "[sdk-pc] $@"
	$(Q)printf '%s\n' \
		'prefix=$(PREFIX)' \
		'exec_prefix=$${prefix}' \
		'libdir=$(LIBDIR)' \
		'includedir=$(INCLUDEDIR)' \
		'' \
		'Name: zuptsdk' \
		'Description: ZUPT source-built compatibility SDK' \
		'URL: https://github.com/cristiancmoises/zupt' \
		'Version: $(SDK_FULLVERSION)' \
		'Libs: -L$${libdir} -lzuptsdk' \
		'Libs.private: $(SDK_PC_PRIVATE_LIBS)' \
		'Cflags: -I$${includedir}' > "$@"

.PHONY: sdk sdk-shared sdk-static sdk-pkgconfig sdk-clean sdk-install \
	sdk-uninstall sdk-verify-symbols sdk-test

sdk: sdk-shared sdk-static sdk-pkgconfig

sdk-shared: $(SDK_SHARED)

sdk-static: $(SDK_STATIC)

sdk-pkgconfig: $(SDK_PC)

sdk-clean:
	$(Q)rm -rf "$(SDK_BUILD_DIR)"

sdk-verify-symbols: $(SDK_SHARED)
	@echo "[sdk-verify] checking exported symbols in $(SDK_SHARED)"
	$(Q)set -eu; \
	tmp=$$(mktemp -d "$${TMPDIR:-/tmp}/zupt-sdk-symbols.XXXXXXXX"); \
	trap 'rm -rf -- "$$tmp"' EXIT HUP INT TERM; \
	nm -D --defined-only "$(SDK_SHARED)" | awk '$$2 == "T" { print $$3 }' | \
		sed 's/@.*//' | sort > "$$tmp/exported"; \
	grep '^        zuptsdk_' "$(SDK_MAP)" | tr -d ' ;' | sort > "$$tmp/declared"; \
	if grep -v '^zuptsdk_' "$$tmp/exported"; then \
		echo "FAIL: non-zuptsdk symbols exported" >&2; exit 1; \
	fi; \
	diff -u "$$tmp/declared" "$$tmp/exported"; \
	echo "  PASS: no symbol leakage and all declared symbols are exported"

# Link and execute without embedding an RPATH. LD_LIBRARY_PATH is scoped to the
# disposable test process and never enters an installed binary.
sdk-test: $(SDK_SHARED)
	@echo "[sdk-test] building and running roundtrip"
	$(Q)$(CC) $(CPPFLAGS) $(PROJECT_CPPFLAGS) -Isdk/include \
		$(CFLAGS) $(PROJECT_CFLAGS) $(LDFLAGS) $(PROJECT_LDFLAGS) \
		sdk/tests/test_sdk_roundtrip.c -L"$(SDK_BUILD_DIR)" -lzuptsdk \
		-o "$(SDK_BUILD_DIR)/test_sdk_roundtrip" $(PROJECT_LDLIBS) $(LDLIBS)
	$(Q)cd sdk && LD_LIBRARY_PATH=build "$$(pwd)/build/test_sdk_roundtrip"

sdk-install: sdk
	$(Q)install -d "$(DESTDIR)$(LIBDIR)" "$(DESTDIR)$(INCLUDEDIR)" \
		"$(DESTDIR)$(SDK_PKGCONFIGDIR)" "$(DESTDIR)$(SDK_LICENSEDIR)"
	$(Q)install -m 0644 "$(SDK_HDR)" "$(DESTDIR)$(INCLUDEDIR)/"
	$(Q)install -m 0755 "$(SDK_SHARED)" "$(DESTDIR)$(LIBDIR)/"
	$(Q)cd "$(DESTDIR)$(LIBDIR)" && \
		ln -sf "libzuptsdk.so.$(SDK_FULLVERSION)" "libzuptsdk.so.$(SDK_SOVERSION)" && \
		ln -sf "libzuptsdk.so.$(SDK_SOVERSION)" libzuptsdk.so
	$(Q)install -m 0644 "$(SDK_STATIC)" "$(DESTDIR)$(LIBDIR)/"
	$(Q)install -m 0644 "$(SDK_PC)" "$(DESTDIR)$(SDK_PKGCONFIGDIR)/"
	$(Q)install -m 0644 $(SDK_LICENSE_FILES) "$(DESTDIR)$(SDK_LICENSEDIR)/"
	$(Q)install -m 0644 sdk/LICENSE "$(DESTDIR)$(SDK_LICENSEDIR)/SDK-LICENSE"

sdk-uninstall:
	$(Q)rm -f "$(DESTDIR)$(LIBDIR)/libzuptsdk.so.$(SDK_FULLVERSION)" \
		"$(DESTDIR)$(LIBDIR)/libzuptsdk.so.$(SDK_SOVERSION)" \
		"$(DESTDIR)$(LIBDIR)/libzuptsdk.so" \
		"$(DESTDIR)$(LIBDIR)/libzuptsdk.a" \
		"$(DESTDIR)$(INCLUDEDIR)/$(notdir $(SDK_HDR))" \
		"$(DESTDIR)$(SDK_PKGCONFIGDIR)/$(notdir $(SDK_PC))"
	$(Q)set -eu; for license_file in $(SDK_LICENSE_FILES); do \
		rm -f "$(DESTDIR)$(SDK_LICENSEDIR)/$${license_file##*/}"; \
	done
	$(Q)rm -f "$(DESTDIR)$(SDK_LICENSEDIR)/SDK-LICENSE"