objify = $(patsubst %.c,$(BUILD_DIR)/%.$2,$(patsubst %.s,$(BUILD_DIR)/%.$2,$1))

BUILD_DIR=build
BIN_DIR=bin
MK_FILE_PATH = $(lastword $(MAKEFILE_LIST))
PRJ_DIR      = $(abspath $(dir $(MK_FILE_PATH)))
GOPATH_LOCAL = $(PRJ_DIR)/$(BUILD_DIR)/

CFLAGS=-Wall -Wextra -Wpedantic -O3 -funroll-loops
LDFLAGS=
AR=ar rcs
RANLIB=ranlib
GOPATH=$(BUILD_DIR)
GO=go
IMPORT_PATH:=github.com/henrydcase/sidh_torture/csidh

CODE_SRC_C = \
	ref/csidh/rng.c \
	ref/csidh/mont.c \
	ref/csidh/csidh.c
CODE_SRC_S = \
	ref/csidh/u512.s \
	ref/csidh/fp.s
CODE_OBJ = \
 	$(call objify,$(CODE_SRC_C),o) \
 	$(call objify,$(CODE_SRC_S),o)

$(BUILD_DIR)/%.o: %.c
	case $@ in */*) f=$@; mkdir -p $${f%/*} ;; esac
	$(CC) -c -o $@ $< $(CFLAGS)

$(BUILD_DIR)/%.o: %.s
	case $@ in */*) f=$@; mkdir -p $${f%/*} ;; esac
	$(CC) -c -o $@ $< $(CFLAGS)

all: libcsidh torturer

libcsidh: $(CODE_OBJ)
	mkdir -p $(PRJ_DIR)/$(BIN_DIR)
	$(AR) $(BIN_DIR)/libcsidh.a $^
	$(RANLIB) $(BIN_DIR)/libcsidh.a
	$(CC) -o $(BIN_DIR)/test_ref ref/test/main.c -L$(BIN_DIR) -lcsidh

clean:
	rm -rf build
	rm -rf bin

torturer: $(BUILD_DIR)/.ok
	GOPATH=$(GOPATH_LOCAL) $(GO) install $(IMPORT_PATH)/cmd/$@

$(BUILD_DIR)/.ok:
	mkdir -p "$(dir $(BUILD_DIR)/src/$(IMPORT_PATH))"
	ln -s `pwd` "$(BUILD_DIR)/src/$(IMPORT_PATH)"
	mkdir -p bin
	ln -s `pwd`/bin $(BUILD_DIR)/bin
	touch $@