# ─────────────────────────────────────────────────────────────────────
#  libzuptsdk — public C ABI for Zupt
# ─────────────────────────────────────────────────────────────────────

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_PREFIX ?= /usr/local

# All zupt sources except main.c get rebuilt with -fPIC for the SDK.
# Object files go to sdk/build/ to avoid colliding with the CLI build.
SDK_BUILD_DIR    = sdk/build
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_PIC_FLAGS    = -fPIC -DZUPT_BUILDING_SDK=1

# VV files need SIMD flags too
SDK_PIC_VV_FLAGS = $(SDK_PIC_FLAGS) $(VV_SIMD_FLAGS)

SDK_SHARED       = sdk/build/libzuptsdk.so.$(SDK_FULLVERSION)
SDK_SHARED_SO    = sdk/build/libzuptsdk.so.$(SDK_SOVERSION)
SDK_SHARED_LINK  = sdk/build/libzuptsdk.so
SDK_STATIC       = sdk/build/libzuptsdk.a

SDK_PC           = sdk/build/zuptsdk.pc

# Compile rule for SDK PIC objects (vv_* files need SIMD flags)
$(SDK_BUILD_DIR)/vv_%.o: src/vv_%.c | $(SDK_BUILD_DIR)
	$(Q)$(CC) $(CFLAGS) $(SDK_PIC_VV_FLAGS) -I include -c $< -o $@

$(SDK_BUILD_DIR)/vaptvupt_api.o: src/vaptvupt_api.c | $(SDK_BUILD_DIR)
	$(Q)$(CC) $(CFLAGS) $(SDK_PIC_FLAGS) -I include -c $< -o $@

$(SDK_BUILD_DIR)/%.o: src/%.c | $(SDK_BUILD_DIR)
	$(Q)$(CC) $(CFLAGS) $(SDK_PIC_FLAGS) -I include -c $< -o $@

$(SDK_BUILD_DIR)/zuptsdk.o: $(SDK_SRC) $(SDK_HDR) | $(SDK_BUILD_DIR)
	$(Q)$(CC) $(CFLAGS) $(SDK_PIC_FLAGS) -I sdk/include -I include -I src -c $< -o $@

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

# Shared library
$(SDK_SHARED): $(SDK_PIC_OBJS) $(SDK_MAP) $(JAZZ_O)
	@echo "[sdk-shared] $@"
	$(Q)$(CC) -shared -fPIC \
		-Wl,-soname,libzuptsdk.so.$(SDK_SOVERSION) \
		-Wl,--version-script,$(SDK_MAP) \
		$(LDFLAGS) \
		$(SDK_PIC_OBJS) $(JAZZ_O) \
		-o $@ $(LDLIBS)
	$(Q)cd $(SDK_BUILD_DIR) && ln -sf $(notdir $(SDK_SHARED)) libzuptsdk.so.$(SDK_SOVERSION)
	$(Q)cd $(SDK_BUILD_DIR) && ln -sf libzuptsdk.so.$(SDK_SOVERSION) libzuptsdk.so

# Static library
$(SDK_STATIC): $(SDK_PIC_OBJS) $(JAZZ_O)
	@echo "[sdk-static] $@"
	$(Q)$(AR) rcs $@ $(SDK_PIC_OBJS) $(JAZZ_O)

# pkg-config file
$(SDK_PC): $(SDK_HDR)
	@echo "[sdk-pc] $@"
	$(Q)mkdir -p $(SDK_BUILD_DIR)
	$(Q)printf 'prefix=$(SDK_PREFIX)\n' > $@
	$(Q)printf 'exec_prefix=$${prefix}\n' >> $@
	$(Q)printf 'libdir=$${exec_prefix}/lib\n' >> $@
	$(Q)printf 'includedir=$${prefix}/include\n\n' >> $@
	$(Q)printf 'Name: zuptsdk\n' >> $@
	$(Q)printf 'Description: Zupt backup compression SDK\n' >> $@
	$(Q)printf 'URL: https://git.securityops.co/cristiancmoises/zupt\n' >> $@
	$(Q)printf 'Version: $(SDK_FULLVERSION)\n' >> $@
	$(Q)printf 'Libs: -L$${libdir} -lzuptsdk\n' >> $@
	$(Q)printf 'Libs.private: -lpthread\n' >> $@
	$(Q)printf 'Cflags: -I$${includedir}\n' >> $@

# Convenience targets
.PHONY: sdk sdk-shared sdk-static sdk-pkgconfig sdk-clean sdk-install \
        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)

# Symbol leakage verification.
# Pass: every exported text symbol starts with `zuptsdk_`.
# Fail: any symbol that doesn't.
sdk-verify-symbols: $(SDK_SHARED)
	@echo "[sdk-verify] checking exported symbols in $(SDK_SHARED)"
	$(Q)leaked=$$(nm -D --defined-only $(SDK_SHARED) | grep ' T ' | awk '{print $$3}' | grep -v '^zuptsdk_' || true); \
	if [ -n "$$leaked" ]; then \
		echo "FAIL: non-zuptsdk symbols exported:"; \
		echo "$$leaked"; \
		exit 1; \
	fi; \
	expected=$$(grep -c '^        zuptsdk_' $(SDK_MAP)); \
	exported=$$(nm -D --defined-only $(SDK_SHARED) | grep ' T ' | grep -c '^.* T zuptsdk_' || true); \
	echo "  $$exported exported / $$expected declared in version script"; \
	if [ "$$exported" -lt "$$expected" ]; then \
		echo "FAIL: $$((expected - exported)) declared symbols are missing from the .so"; \
		nm -D --defined-only $(SDK_SHARED) | grep ' T ' | grep '^.* T zuptsdk_' | awk '{print $$3}' | sort > /tmp/exp; \
		grep '^        zuptsdk_' $(SDK_MAP) | tr -d ' ;' | sort > /tmp/decl; \
		diff /tmp/decl /tmp/exp; \
		exit 1; \
	fi; \
	echo "  PASS: no symbol leakage, all declared symbols exported"

# Build & run roundtrip test
sdk-test: $(SDK_SHARED)
	@echo "[sdk-test] building and running roundtrip"
	$(Q)$(CC) $(CFLAGS) -I sdk/include sdk/tests/test_sdk_roundtrip.c \
		-Lsdk/build -lzuptsdk \
		-Wl,-rpath,'$$ORIGIN/build' \
		-o sdk/build/test_sdk_roundtrip $(LDLIBS)
	$(Q)cd sdk && LD_LIBRARY_PATH=build ./build/test_sdk_roundtrip

sdk-install: sdk
	install -d $(DESTDIR)$(SDK_PREFIX)/lib
	install -d $(DESTDIR)$(SDK_PREFIX)/include
	install -d $(DESTDIR)$(SDK_PREFIX)/lib/pkgconfig
	install -m 0644 $(SDK_HDR) $(DESTDIR)$(SDK_PREFIX)/include/
	install -m 0755 $(SDK_SHARED) $(DESTDIR)$(SDK_PREFIX)/lib/
	cd $(DESTDIR)$(SDK_PREFIX)/lib && \
		ln -sf libzuptsdk.so.$(SDK_FULLVERSION) libzuptsdk.so.$(SDK_SOVERSION) && \
		ln -sf libzuptsdk.so.$(SDK_SOVERSION) libzuptsdk.so
	install -m 0644 $(SDK_STATIC) $(DESTDIR)$(SDK_PREFIX)/lib/
	install -m 0644 $(SDK_PC) $(DESTDIR)$(SDK_PREFIX)/lib/pkgconfig/