# Copyright 2022 John-Mark Gurney.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#

PROGS = rs485gw rs485hid

SRCS.rs485gw = rs485gw.c
SRCS.rs485gw+= $(SRCS.USB_CDC)
SRCS.rs485gw+= $(SRCS.USB)

SRCS.rs485hid = rs485hid.c
SRCS.rs485hid+= $(SRCS.USB_HID)
SRCS.rs485hid+= $(SRCS.USB)
SRCS.rs485hid+= $(STROBE_SRCS)
SRCS.rs485hid+= comms.c
SRCS.rs485hid+= memdebug.c
SRCS.rs485hid+= strobe_pki.c

CFLAGS.rs485hid+= -DEXTERNAL_GET_DESCRIPTOR=1
CFLAGS.rs485hid+= -I$(.OBJDIR)	# for public_key.h
SRCS.rs485hid+= usb_hid_base.c

.if empty(HID_PRIV_KEY) && exists($(.CURDIR)/.hid_priv_key)
HID_PRIV_KEY!= cat $(.CURDIR)/.hid_priv_key
.endif

.PHONY: hid_priv_key
hid_priv_key:
	@LANG=C tr -c -d a-f0-9 < /dev/urandom | dd bs=1 of=$(.CURDIR)/.hid_priv_key count=64 2>/dev/null
	@echo 'Key created and put into .hid_priv_key.'

# make this a phony target so it's always run
# dependancies will only be made when it's updated
.PHONY: $(.OBJDIR)/public_key.h
$(.OBJDIR)/public_key.h:
	@if [ "$(HID_PRIV_KEY)" = "" ]; then echo 'Must provide HID_PRIV_KEY make variable or have a non-empty file ".hid_priv_key".  This can be created by the command "$(MAKE) hid_priv_key".'; false; fi

	@echo 'static const uint8_t pubkey[] = {' $$(python3 -c 'import sys; import codecs; from syote_comms import X25519; print(", ".join(hex(x) for x in X25519.frombytes(codecs.decode(sys.argv[1], "hex")).getpub()))' $(HID_PRIV_KEY) ) "};" > public_key.h.tmp
	@echo 'static_assert(sizeof pubkey == 32);' >> public_key.h.tmp

	if [ "$$(cat public_key.h.tmp)" = "static uint8_t pubkey[] = { };" -o "$$(cat public_key.h.tmp)" = "" ]; then rm -f "$@"; false; fi

	(cmp public_key.h.tmp public_key.h >/dev/null 2>&1 && rm public_key.h.tmp) || mv public_key.h.tmp public_key.h

strobe_pki.o: $(.OBJDIR)/public_key.h

usb_hid_base.c: usb_hid.py
	PYTHONPATH=$(.CURDIR) python $(STM32)/usb/usb_gen.py $(.ALLSRC:[1]:T:R)

.PATH: $(.CURDIR)/..

CFLAGS += -g

WITH_RS485FRAME = yes
WITH_STM32F103 = yes
WITH_USB_CDC = yes
WITH_USB_HID = yes

.include <../mk/boards.mk>

EXTRA_DEPENDS+= $(STM32)/usb/usb_gen.py

.include <../mk/mu.progs.mk>

usb_hid_base.c: $(STM32)/usb/usb_gen.py