# OpenPuck developer convenience targets.

# Pin to clang-format 18 to match CI; output differs between versions, so a
# mismatch would make CI reject locally-formatted code. Resolve the binary in
# order of preference: the apt-style versioned name (CI / Linux), the Homebrew
# llvm@18 keg (macOS), then a bare clang-format as a last resort. Override with
# `make format CLANG_FORMAT=/path/to/clang-format` if yours lives elsewhere.
CLANG_FORMAT ?= $(shell command -v clang-format-18 \
	|| ([ -x /opt/homebrew/opt/llvm@18/bin/clang-format ] && echo /opt/homebrew/opt/llvm@18/bin/clang-format) \
	|| ([ -x /usr/local/opt/llvm@18/bin/clang-format ] && echo /usr/local/opt/llvm@18/bin/clang-format) \
	|| command -v clang-format)

# All hand-written C/C++ sources. Generated headers (git_version.h) are
# gitignored and excluded here so formatting never touches them.
FORMAT_FILES := $(shell find OpenPuck ReversePuckFirmware puck_sniffer pairtui \
	\( -name '*.c' -o -name '*.cpp' -o -name '*.h' -o -name '*.hpp' -o -name '*.ino' \) \
	-not -name 'git_version.h')

# --- firmware build ---------------------------------------------------------
# The OpenPuck firmware needs two TinyUSB config values that differ from the Adafruit nRF52 core defaults:
#   CFG_TUD_HID=4            -- four HID interfaces (Steam mode exposes four puck slots); core default is 2.
#   CFG_TUD_TASK_QUEUE_SZ=64 -- deeper usbd event queue; the default 16 deadlocks the loop task under comms
#                               load -> watchdog reset (see OpenPuck.ino + docs/BUILD_AND_DEPLOY.md).
#   CFG_TUD_VENDOR_TX_BUFSIZE=256 -- the WebUSB status blob is ~118 B; the core default 64 can't hold it whole,
#                               so the panel send (which drops rather than blocks when the FIFO is full) could
#                               never fit a frame -> blank panel. Sized to hold a full blob with headroom.
# They're baked in here so a normal build is just `make build` -- no need to remember the flags. Override any
# on the command line, e.g.   make build CFG_TUD_HID=6 CFG_TUD_TASK_QUEUE_SZ=128
# or add your own defines:     make build EXTRA_FLAGS="-DOPK_LOG=1"
FQBN ?= adafruit:nrf52:feather52840
CFG_TUD_HID ?= 4
# Deep so a loop()-context sendReport never blocks on a full usbd event queue (the watchdog path). Sends run
# from loop() now (usbTxPump) for stable RF timing, so this depth is what keeps that block from happening.
CFG_TUD_TASK_QUEUE_SZ ?= 512
# Must hold a whole WebUSB status blob (~118 B) so the drop-on-full panel send can fit one; core default 64 is
# too small and would silently drop every frame (blank panel / stale mappings).
CFG_TUD_VENDOR_TX_BUFSIZE ?= 256
EXTRA_FLAGS ?=
# {build.flags.usb} is expanded by arduino-cli (VID/PID/strings); pass it through verbatim.
USB_EXTRA_FLAGS = -DNRF52840_XXAA {build.flags.usb} -DCFG_TUD_HID=$(CFG_TUD_HID) -DCFG_TUD_TASK_QUEUE_SZ=$(CFG_TUD_TASK_QUEUE_SZ) -DCFG_TUD_VENDOR_TX_BUFSIZE=$(CFG_TUD_VENDOR_TX_BUFSIZE) $(EXTRA_FLAGS)

# Low-frequency clock source for the SoftDevice (BLE controllers feature). The feather52840 variant hardcodes
# USE_LFXO (32.768 kHz crystal), but the Pro Micro / SuperMini nRF52840 CLONES this firmware runs on have NO
# crystal -- with LFXO the SoftDevice's Bluefruit.begin() fails (BLE_ST_FAILED). variant_lfrc/ is a verbatim
# copy of the express variant with ONLY the LF clock flipped to the internal RC oscillator (250 ppm, well
# within BLE tolerance and what these boards already run their LFCLK on in bare-metal mode); the pin map / USB
# identity are otherwise identical. A compile-time #error in ble_host.cpp guards against this override being
# dropped (which would silently re-break BLE). Set LF_VARIANT_PATH= empty to fall back to the stock LFXO
# variant if you build for a genuine crystal board without BLE.
LF_VARIANT_PATH ?= $(CURDIR)/variant_lfrc
VARIANT_PROP = $(if $(LF_VARIANT_PATH),--build-property "build.variant.path=$(LF_VARIANT_PATH)",)

# `flash`/`deploy` take the serial port as a REQUIRED POSITIONAL arg: `make flash /dev/cu.usbmodem1101`.
# (No auto-detect -- uploading to a guessed serial port risks writing to the wrong device. List with
# `arduino-cli board list`.) FLASH_PORT = whatever goal isn't one of our real targets; the catch-all rule at
# the bottom swallows it so make doesn't try to build the port path as a target.
FLASH_PORT := $(filter-out format format-check check build build-recovery flash deploy,$(MAKECMDGOALS))
UPLOAD = arduino-cli upload -b $(FQBN) -p "$(FLASH_PORT)" OpenPuck

.PHONY: format format-check check build build-recovery flash deploy

## Compile the firmware with the required USB flags baked in. Override CFG_TUD_HID / CFG_TUD_TASK_QUEUE_SZ /
## EXTRA_FLAGS / FQBN as make variables if needed.
build:
	arduino-cli compile -b $(FQBN) --build-property "build.extra_flags=$(USB_EXTRA_FLAGS)" $(VARIANT_PROP) OpenPuck

## One-time factory-reset recovery image (wipes persistent storage once on first boot). See §6 of the build doc.
build-recovery:
	$(MAKE) build EXTRA_FLAGS="$(EXTRA_FLAGS) -DOPK_FACTORY_RESET=1"

## Upload the most recent build. Usage: make flash <port>   e.g.  make flash /dev/cu.usbmodem1101
## The board may need DFU/bootloader mode first (double-tap RST): puck (Steam/Lizard) mode drops the CDC port
## so arduino-cli can't auto-reset it -- see docs/BUILD_AND_DEPLOY.md.
flash:
	@[ -n "$(FLASH_PORT)" ] || { echo "usage: make flash <port>   e.g. make flash /dev/cu.usbmodem1101   (list ports: arduino-cli board list)"; exit 1; }
	$(UPLOAD)

## Build then upload in one step. Usage: make deploy <port>   (same build overrides as `build`).
deploy:
	@[ -n "$(FLASH_PORT)" ] || { echo "usage: make deploy <port>   e.g. make deploy /dev/cu.usbmodem1101"; exit 1; }
	$(MAKE) build
	$(UPLOAD)

# Swallow the positional <port> arg so make doesn't error trying to build it as a target. Scoped to things
# that look like a serial port (so a real typo like `make buld` still errors instead of silently no-op'ing).
/dev/% COM% tty% cu.%:
	@:

## Reformat all C/C++ sources in place using the Linux kernel style.
format:
	$(CLANG_FORMAT) -i $(FORMAT_FILES)

## Verify all C/C++ sources are formatted; exit non-zero if any differ.
## Used by CI to reject unformatted code.
format-check:
	$(CLANG_FORMAT) --dry-run --Werror $(FORMAT_FILES)

## Everything CI gates on.
check: format-check