CONFIGS_REPO_URL ?= https://github.com/betaflight/config
# handle only this directory as config submodule
CONFIGS_SUBMODULE_DIR := src/config
BASE_CONFIGS           = $(sort $(notdir $(patsubst %/,%,$(dir $(wildcard $(CONFIG_DIR)/configs/*/config.h)))))

ifneq ($(words $(CONFIG_DIR)),1)
$(error CONFIG_DIR/BETAFLIGHT_CONFIG path contains whitespace; unsupported by GNU make wildcard.)
endif

# Config handling — only active when CONFIG= is set explicitly
ifneq ($(CONFIG),)

ifeq ($(wildcard $(CONFIG_DIR)/configs/),)
$(error `$(CONFIG_DIR)` not found. Have you hydrated configuration using: 'make configs'?)
endif

ifneq ($(TARGET),)
$(error TARGET or CONFIG should be specified. Not both.)
endif

CONFIG_HEADER_FILE  = $(CONFIG_DIR)/configs/$(CONFIG)/config.h
CONFIG_SOURCE_FILE  = $(CONFIG_DIR)/configs/$(CONFIG)/config.c
INCLUDE_DIRS       += $(CONFIG_DIR)/configs/$(CONFIG)

# include $(CONFIG)/config.mk if it exists
-include $(CONFIG_DIR)/configs/$(CONFIG)/config.mk

# OCTOSPI_FLASH_CHIP selects the flash chip wired to the OCTOSPI/XSPI peripheral.
# Set in per-config config.mk (e.g. OCTOSPI_FLASH_CHIP := MX66UW1G45G). Emits both
# USE_FLASH_<chip> (chip driver gating) and OCTOSPI_FLASH_CHIP_<chip> (build-time
# selection marker for chips that cannot be probed via JEDEC RDID, such as those
# operating in 8-line OPI mode).
ifneq ($(OCTOSPI_FLASH_CHIP),)
TARGET_FLAGS += -DUSE_FLASH_$(OCTOSPI_FLASH_CHIP) -DOCTOSPI_FLASH_CHIP_$(OCTOSPI_FLASH_CHIP)
endif

ifneq ($(wildcard $(CONFIG_HEADER_FILE)),)

CONFIG_SRC :=
ifneq ($(wildcard $(CONFIG_SOURCE_FILE)),)
CONFIG_SRC += $(CONFIG_SOURCE_FILE)
TARGET_FLAGS += -DUSE_CONFIG_SOURCE
endif

CONFIG_REVISION := norevision
ifeq ($(shell git -C "$(CONFIG_DIR)" rev-parse --is-inside-work-tree 2>/dev/null),true)
ifeq ($(strip $(shell git -C "$(CONFIG_DIR)" status --porcelain -uno 2>/dev/null)),)
CONFIG_REVISION := $(shell git -C "$(CONFIG_DIR)" rev-parse --short=7 HEAD 2>/dev/null)
CONFIG_REVISION_DEFINE := -D'__CONFIG_REVISION__="$(CONFIG_REVISION)"'
endif
endif

# Extract constants from $(CONFIG_HEADER_FILE) via preprocessor expansion
# Oscillator frequency (MHz) -> Hz
HSE_VALUE_MHZ := $(call pp_def_value,$(CONFIG_HEADER_FILE),SYSTEM_HSE_MHZ)
ifneq ($(strip $(HSE_VALUE_MHZ)),)
HSE_VALUE     := $(shell echo $$(( $(HSE_VALUE_MHZ) * 1000000 )) )
endif

# MCU target from config header
TARGET        := $(call pp_def_value,$(CONFIG_HEADER_FILE),FC_TARGET_MCU)
ifeq ($(strip $(TARGET)),)
$(error No TARGET identified. Is the $(CONFIG_HEADER_FILE) valid for $(CONFIG)?)
endif

# Optional EXST address adjustment
EXST_ADJUST_VMA := $(call pp_def_value,$(CONFIG_HEADER_FILE),FC_VMA_ADDRESS)
ifneq ($(strip $(EXST_ADJUST_VMA)),)
EXST = yes
endif

else #exists
$(error `$(CONFIG_HEADER_FILE)` not found. Have you hydrated configuration using: 'make configs'?)
endif #CONFIG_HEADER_FILE exists
endif #config

.PHONY: configs
configs:
ifeq ($(shell realpath "$(CONFIG_DIR)"),$(shell realpath "$(CONFIGS_SUBMODULE_DIR)"))
	@echo "Updating config submodule: $(CONFIGS_SUBMODULE_DIR)"
	$(V1) git submodule update --init -- "$(CONFIGS_SUBMODULE_DIR)" || { echo "Config submodule update failed. Please check your git configuration."; exit 1; }
	@echo "Submodule update succeeded."
else
ifeq ($(wildcard $(CONFIG_DIR)),)
	@echo "Hydrating clone for configs: $(CONFIG_DIR)"
	$(V1) git clone --depth=1 $(CONFIGS_REPO_URL) "$(CONFIG_DIR)"
else
	$(V1) git -C "$(CONFIG_DIR)" pull --ff-only origin
endif
endif

$(BASE_CONFIGS):
	@echo "Building target config $@"
	$(V0) $(MAKE) fwo CONFIG=$@
	@echo "Building target config $@ succeeded."

## <CONFIG>_rev    : build configured target and add revision to filename
$(addsuffix _rev,$(BASE_CONFIGS)):
	$(V0) $(MAKE) fwo CONFIG=$(subst _rev,,$@) REV=yes

# When configs are not hydrated, BASE_CONFIGS is empty so config targets
# have no recipe. Override Make's default "No rule" error with a helpful message
# but only for targets explicitly requested on the command line.
ifeq ($(wildcard $(CONFIG_DIR)/configs/),)
.DEFAULT:
	@if echo " $(MAKECMDGOALS) " | grep -q " $@ "; then \
		echo "*** No rule to make target '$@'. If this is a configuration target, run 'make configs' first." >&2; \
		exit 1; \
	fi
endif