# https://spin.atomicobject.com/2016/08/26/makefile-c-projects/ was a great
# base for this Makefile

-include config.mk

LIB := $(BUILD_DIR)/$(LIB_FILENAME)

SRCS != find '$(SRC_DIR)' -iname '*.c'
SRCS_H != find include -iname '*.h'
SRCS_H_INTERNAL != find $(SRC_DIR) -iname '*.h'
SRCS_TEST != find '$(TEST_DIR)' -iname '*.c'
SRCS_EXAMPLE != find '$(EXAMPLE_DIR)' -iname '*.c'

OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
OBJS_TEST := $(SRCS_TEST:%=$(BUILD_DIR)/%.o)
OBJS_EXAMPLE := $(SRCS_EXAMPLE:%=$(BUILD_DIR)/%.o)

DEPS := $(SRCS:%=$(BUILD_DIR)/%.d) $(SRCS_TEST:%=$(BUILD_DIR)/%.d)

BIN_TEST := $(BUILD_DIR)/$(TEST_DIR)/runner
BINS_EXAMPLE := $(OBJS_EXAMPLE:%.c.o=%)

TARGETS_TEST := $(BINS_TEST:%=test-%)
TARGETS_MEM_TEST := $(BINS_TEST:%=test-mem-%)
TARGETS_EXAMPLE := $(BINS_EXAMPLE:%=example-%)

_CFLAGS := $(addprefix -I,$(INC_DIRS)) $(CFLAGS) -Wall -Wextra

.PHONY: all
all: lib


# =====COMPILATION=====
# Utility used by the CI to lint
.PHONY: objs
objs: $(OBJS)

.PHONY: lib
lib: $(LIB)
$(LIB): $(OBJS)
	ar -rcs $@ $(OBJS)

$(BUILD_DIR)/$(SRC_DIR)/%.c.o: $(SRC_DIR)/%.c
	mkdir -p $(dir $@)
	$(CC) -c $(_CFLAGS) $< -o $@

# =====TESTING=====
.PHONY: test
test: $(BIN_TEST)
	'./$^'

.PHONY: test-mem
test-mem: $(BIN_TEST)
	valgrind --tool=memcheck --error-exitcode=1 --track-origins=yes --leak-check=full './$^'

.PHONY: build-test
build-test: $(BIN_TEST)

$(BIN_TEST): $(OBJS_TEST) $(LIB)
	$(CC) -o $@ $^ $(_LDFLAGS)

# Along with the include directory, each test includes $(TEST_DIR) (which
# contains the acutest.h header file), and the src directory of the module it's
# testing. This allows tests to access internal methods, which aren't publicly
# exposed.
$(BUILD_DIR)/$(TEST_DIR)/%.c.o: $(TEST_DIR)/%.c
	mkdir -p $(dir $@)
	$(CC) $(_CFLAGS) -I$(TEST_DIR) \
		-I$(SRC_DIR)/_include \
		-c $< -o $@

# =====EXAMPLES=====
.PHONY: build-example
build-example: $(BINS_EXAMPLE)

$(BINS_EXAMPLE): %: %.c.o $(LIB)
	$(CC) $(LDFLAGS) \
		$^ -o $@

# Example binaries link the resulting library
$(BUILD_DIR)/$(EXAMPLE_DIR)/%.c.o: $(EXAMPLE_DIR)/%.c
	mkdir -p $(dir $@)
	$(CC) $(_CFLAGS) -I$(PUB_INC_DIR) -c $< -o $@

# =====MAINTENANCE=====
.PHONY: lint
lint:
	clang-format -n --Werror \
		$(filter-out $(THIRDPARTY),$(SRCS)) \
		$(filter-out $(THIRDPARTY),$(SRCS_H)) \
		$(filter-out $(THIRDPARTY),$(SRCS_H_INTERNAL))

.PHONY: fmt
fmt:
	clang-format -i \
		$(filter-out $(THIRDPARTY),$(SRCS)) \
		$(filter-out $(THIRDPARTY),$(SRCS_H)) \
		$(filter-out $(THIRDPARTY),$(SRCS_H_INTERNAL))

.PHONY: check
check:
	mkdir -p $(BUILD_DIR)/cppcheck
	cppcheck \
		$(addprefix -I,$(INC_DIRS)) \
		--cppcheck-build-dir=$(BUILD_DIR)/cppcheck \
		--error-exitcode=1 \
		--enable=warning,style \
		--inline-suppr \
		--check-level=exhaustive \
		--quiet \
		-j$(shell nproc) \
		$(filter-out $(THIRDPARTY),$(SRCS))

.PHONY: clean
clean:
	rm -rf '$(BUILD_DIR)'


.PHONY: bear
bear: clean
	bear -- make
	bear --append -- make build-test
	bear --append -- make build-example


# Make make aware of the .d files
-include $(DEPS)