EXT_ORIG        ?= ORIG.o
EXT_PATCHED     ?= PATCHED.o
EXT_FAIL        ?= PATCHED.FAIL.o
EXT_TEST        ?= test
EXT_OUTPUT      ?= OUTPUT.o
EXT_TEST_OUTPUT ?= test.out
TNAME            = $(@:.$(EXT_OUTPUT)=)

ifndef VERBOSE
MUTE_PASS := >/dev/null
MUTE_FAIL := >/dev/null 2>&1
endif

SRC_PATH ?= $(realpath ../../../)
CDO      ?= $(SRC_PATH)/kpatch-build/create-diff-object

TENV = PARA_STRUCT_SIZE=16 EX_STRUCT_SIZE=12 BUG_STRUCT_SIZE=12 ALT_STRUCT_SIZE=13

TARGETS      = $(patsubst %.$(EXT_ORIG),%.$(EXT_OUTPUT),$(wildcard *.$(EXT_ORIG)))
TEST_TARGETS = $(patsubst %.$(EXT_TEST),%.$(EXT_TEST_OUTPUT),$(wildcard *.$(EXT_TEST)))

define check_lfs =
	$(if $(shell head -1 $(1) | grep git-lfs.github.com),
		$(error $(1) is not fetched. Unittests require https://git-lfs.github.com/),
	)
endef

define check_stripped =
	$(if $(shell readelf --debug-dump $(1)),
		$(error $(1) is not properly stripped, use 'strip --strip-debug --keep-file-symbols $(1)' to fix this),
	)
endef

define check_all =
	$(call check_lfs,$(1))
	$(call check_stripped,$(1))
endef

all: $(TARGETS) $(TEST_TARGETS)

clean:
	rm -f $(TARGETS) $(TEST_TARGETS)

%.$(EXT_TEST_OUTPUT): %.$(EXT_OUTPUT) %.$(EXT_TEST)
	bash $(@:.$(EXT_TEST_OUTPUT)=.$(EXT_TEST)) $<
# Don't rely on script creating this
	@touch $@

%.$(EXT_OUTPUT): %.$(EXT_ORIG) %.$(EXT_PATCHED) $(CDO)
	$(call check_all,$(TNAME).$(EXT_ORIG))
	$(call check_all,$(TNAME).$(EXT_PATCHED))
	$(TENV) $(CDO) $(TNAME).$(EXT_ORIG) $(TNAME).$(EXT_PATCHED) \
		$(TNAME).$(EXT_ORIG) $@ /dev/null test_$(TNAME) $(MUTE_PASS)

%.$(EXT_OUTPUT): %.$(EXT_ORIG) %.$(EXT_FAIL) $(CDO)
	$(call check_all,$(TNAME).$(EXT_ORIG))
	$(call check_all,$(TNAME).$(EXT_FAIL))
	! $(TENV) $(CDO) $(TNAME).$(EXT_ORIG) $(TNAME).$(EXT_FAIL) \
		$(TNAME).$(EXT_ORIG) $@ /dev/null test_$(TNAME) $(MUTE_FAIL)
# Expecting to fail, thus create output file manually so we won't rerun the
# test without clean
	@touch $@