# SPDX-License-Identifier: LicenseRef-Starship-1.0
# Copyright (c) 2023-2026 Robert A. James
#
# The kernel host tests (docs/v4.0.0/plans/2026-11-12-kernel-host-tests.md): each test_<unit>.c
# built on the host with the kernel source file(s) it tests and the fakes, nothing else of the
# kernel, and run.
#
#   make -C kernel/tests test        build and run them all; fails if any check fails
#   make -C kernel/tests run-test_gpt
#
# A test's sources are SRC_<test>; give another on the command line to run the same test against
# it (how a test is seen to fail against the code before a fix):
#   make -C kernel/tests run-test_gpt SRC_test_gpt=/path/to/old/gpt.c

HERE   := $(abspath $(dir $(lastword $(MAKEFILE_LIST))))
ROOT   := $(abspath $(HERE)/../..)
BUILD  := $(ROOT)/build/kernel-tests
CC     ?= cc
CFLAGS := -std=c99 -Wall -Wextra -Werror -O2 -g -I$(HERE) -I$(ROOT)/kernel/include \
          -I$(ROOT)/kernel/include/starkernel -I$(ROOT)/v3/include

TESTS := test_gpt test_usb_config test_sk_v4_stop test_sk_v4_slots test_sk_v4_mint
SRC_test_sk_v4_mint := $(ROOT)/kernel/src/v4/sk_v4_mint.c $(ROOT)/kernel/src/gpt.c
EXTRA_test_sk_v4_mint := -D__STARKERNEL__ -I$(ROOT)/v4/include
SRC_test_sk_v4_slots := $(ROOT)/kernel/src/v4/sk_v4_slots.c
SRC_test_sk_v4_stop := $(ROOT)/kernel/src/v4/sk_v4_stop.c
SRC_test_gpt := $(ROOT)/kernel/src/gpt.c
SRC_test_usb_config := $(ROOT)/kernel/src/usb/usb_config.c

define TEST_RULE
$(BUILD)/$(1): $(HERE)/$(1).c $(HERE)/fakes.c $(HERE)/fakes.h $(HERE)/harness.h $$(SRC_$(1))
	@mkdir -p $(BUILD)
	$(CC) $(CFLAGS) $$(EXTRA_$(1)) $(HERE)/$(1).c $(HERE)/fakes.c $$(SRC_$(1)) -o $$@

.PHONY: run-$(1)
run-$(1): $(BUILD)/$(1)
	@echo "$(1)"
	@$(BUILD)/$(1)
endef
$(foreach t,$(TESTS),$(eval $(call TEST_RULE,$(t))))

.PHONY: test
test: $(addprefix run-,$(TESTS))
	@echo "all kernel host tests passed"

# #182: sk_v4_grow.c's 32-bit block arithmetic holds while Artemis is capped below 4 TiB -- the build
# itself refuses a cap past that. Seen here: 256 GiB (the real cap) compiles, 4096 GiB must not.
.PHONY: run-check_cap
run-check_cap:
	@echo "check_cap"
	@$(CC) $(CFLAGS) -I$(ROOT)/v4/include -DSTICK_ARTEMIS_CAP_GIB=256ULL -c $(ROOT)/kernel/src/v4/sk_v4_grow.c -o /dev/null \
	  || { echo "FAIL #182: sk_v4_grow.c does not build with the real cap, 256 GiB"; exit 1; }
	@if $(CC) $(CFLAGS) -I$(ROOT)/v4/include -DSTICK_ARTEMIS_CAP_GIB=4096ULL -c $(ROOT)/kernel/src/v4/sk_v4_grow.c -o /dev/null 2>/dev/null; then \
	  echo "FAIL #182: a 4096 GiB cap builds -- its block numbers do not fit 32 bits, and nothing stops it"; exit 1; fi
	@if $(CC) $(CFLAGS) -I$(ROOT)/v4/include -c $(ROOT)/kernel/src/v4/sk_v4_grow.c -o /dev/null 2>/dev/null; then \
	  echo "FAIL #182: no cap defined builds -- the check would be skipped, not failed"; exit 1; fi
	@echo "  3 checks, 0 failures"

test: run-check_cap