# SE050 WireGuard Makefile
# Fallback for environments without CMake

CC = gcc
AR = ar
CFLAGS = -Wall -Wextra -std=c11 -I include
LDFLAGS = 

# Source files
SRCS = src/se050_i2c_hal.c \
       src/se050_session.c \
       src/se050_keystore.c \
       src/se050_rng.c \
       src/se050_x25519.c \
       src/se050_x25519_sw.c \
       src/se050_scp03.c \
       src/se050_scp03_keys.c

# Object files
OBJS = $(SRCS:.c=.o)

# Test sources
TEST_SRCS = tests/test_scp03.c tests/test_scp03_hardware.c
TEST_OBJS = $(TEST_SRCS:.c=.o)

# Test executables
TEST_SCP03 = test_scp03
TEST_HARDWARE = test_scp03_hardware
TEST_SE050 = test_scp03_se050
TEST_X25519 = test_x25519_ecdh
TEST_KEY_ROTATION = test_key_rotation
TEST_X25519_SW = test_x25519_sw

# Target library
LIB = libse050_wireguard.a

# Chip selection (default: SE050C0)
SE050_CHIP ?= SE050C0

# I2C bus options
I2C_OPTS ?=

# Chip ID mapping
ifeq ($(SE050_CHIP),SE050C0)
    CHIP_ID = 0
else ifeq ($(SE050_CHIP),SE050C1)
    CHIP_ID = 1
else ifeq ($(SE050_CHIP),SE050C2)
    CHIP_ID = 2
else ifeq ($(SE050_CHIP),SE050E2)
    CHIP_ID = 3
else
    $(error Invalid SE050_CHIP. Use SE050C0, SE050C1, SE050C2, or SE050E2)
endif

# Default target
all: $(LIB) $(TEST_SCP03) $(TEST_HARDWARE) $(TEST_SE050) $(TEST_X25519) $(TEST_X25519_SW)

# Create build directory
build:
	@mkdir -p build

# Build static library
$(LIB): $(OBJS)
	@mkdir -p build
	$(AR) rcs build/$@ $^

# Build test executables
$(TEST_SCP03): tests/test_scp03.c $(LIB)
	@mkdir -p build
	$(CC) $(CFLAGS) -o build/$@ $< build/$(LIB) $(LDFLAGS)

$(TEST_HARDWARE): tests/test_scp03_hardware.c $(LIB)
	@mkdir -p build
	$(CC) $(CFLAGS) -o build/$@ $< build/$(LIB) $(LDFLAGS)

# SE050 hardware test with chip selection
$(TEST_SE050): tests/test_scp03_se050.c $(LIB)
	@mkdir -p build
	$(CC) $(CFLAGS) -DSE050_CHIP=$(CHIP_ID) -o build/$@ $< build/$(LIB) $(LDFLAGS)

# X25519 ECDH test
$(TEST_X25519): tests/test_x25519_ecdh.c $(LIB)
	@mkdir -p build
	$(CC) $(CFLAGS) -o build/$@ $< build/$(LIB) $(LDFLAGS)

# Key rotation test
$(TEST_KEY_ROTATION): tests/test_scp03_key_rotation.c $(LIB)
	@mkdir -p build
	$(CC) $(CFLAGS) -DSE050_CHIP=$(CHIP_ID) -o build/$@ $< build/$(LIB) $(LDFLAGS)

# Software X25519 test (standalone, no library needed)
$(TEST_X25519_SW): src/se050_x25519_sw.c
	@mkdir -p build
	$(CC) $(CFLAGS) -DX25519_SW_TEST -o build/$@ $<

# Compile source files
src/%.o: src/%.c
	$(CC) $(CFLAGS) -c $< -o $@

# Compile test files
tests/%.o: tests/%.c
	$(CC) $(CFLAGS) -c $< -o $@

# Run all tests
test: all
	@echo "Running SCP03 tests..."
	./build/$(TEST_SCP03)
	@echo ""
	@echo "Running SCP03 hardware tests (mock)..."
	./build/$(TEST_HARDWARE)
	@echo ""
	@echo "Running X25519 ECDH tests..."
	./build/$(TEST_X25519)
	@echo ""
	@echo "Running Software X25519 tests..."
	./build/$(TEST_X25519_SW)
	@echo ""
	@echo "Note: To run SE050 hardware tests, use:"
	@echo "  make SE050_CHIP=SE050C1 test_se050"

# Run SE050 hardware tests (requires actual hardware)
test_se050: $(TEST_SE050)
	@echo "Running SE050 hardware tests..."
	@echo "Chip: $(SE050_CHIP)"
	@echo "I2C Bus: /dev/i2c-1 (use I2C_BUS=/dev/i2c-X to change)"
	./build/$(TEST_SE050) $(I2C_OPTS)

# Clean build artifacts
clean:
	rm -rf build *.o src/*.o tests/*.o

# Clean and rebuild
rebuild: clean all

# Install (requires sudo)
install: all
	install -d $(DESTDIR)/usr/local/include
	install -d $(DESTDIR)/usr/local/lib
	install -m 644 include/se050_wireguard.h $(DESTDIR)/usr/local/include/
	install -m 644 build/$(LIB) $(DESTDIR)/usr/local/lib/

# Uninstall
uninstall:
	rm -f $(DESTDIR)/usr/local/include/se050_wireguard.h
	rm -f $(DESTDIR)/usr/local/lib/$(LIB)

.PHONY: all build test clean rebuild install uninstall