GTEST_DIR = lib/gtest-1.6.0
GTEST_LIB = libgtest.a
CC = g++

SRC_FOLDER = src
SRC_OBJ_FOLDER = obj/src
SRC_CPP_FILES = $(wildcard ${SRC_FOLDER}/*.cc)
SRC_OBJ_FILES = $(addprefix ${SRC_OBJ_FOLDER}/,$(notdir $(SRC_CPP_FILES:.cc=.o)))

TESTS_FOLDER = test
TESTS_OBJ_FOLDER = obj/test
TESTS_CPP_FILES = $(wildcard ${TESTS_FOLDER}/*.cc)
TESTS_OBJ_FILES = $(addprefix ${TESTS_OBJ_FOLDER}/,$(notdir $(TESTS_CPP_FILES:.cc=.o)))

TESTS_CC_FLAGS = -I${GTEST_DIR}/include -I${SRC_FOLDER} -Wall -Werror
TESTS_LD_FLAGS = -lpthread

.phony: test

default: test

all: ${SRC_OBJ_FILES}
        ${CC} -o $@ $<

${SRC_OBJ_FOLDER}/%.o: ${SRC_FOLDER}/%.cc
        ${CC} -Wall -c -o $@ $<

build-dir:
        @mkdir -p ${SRC_OBJ_FOLDER}
        @mkdir -p ${TESTS_OBJ_FOLDER}

build-gtest:
        ${CC} -I${GTEST_DIR}/include -I${GTEST_DIR} -c ${GTEST_DIR}/src/gtest-all.cc
        ar -rv ${GTEST_LIB} gtest-all.o

build-tests: ${TESTS_OBJ_FILES}
        # Hack to get rid of the main in src/ and not get "multiple definition" error
        ${CC} ${TESTS_LD_FLAGS} -o $@ $< ${GTEST_LIB} $(subst obj/src/main.o,,${SRC_OBJ_FILES})

${TESTS_OBJ_FOLDER}/%.o: ${TESTS_FOLDER}/%.cc
        ${CC} ${TESTS_CC_FLAGS} -c -o $@ $<

test: build-dir build-gtest all build-tests
        ./build-tests

clean:
        @rm -rf ${SRC_OBJ_FOLDER}
        @rm -rf ${TESTS_OBJ_FOLDER}
        @rm -rf obj
        @rm -f gtest-all.o
        @rm -f ${GTEST_LIB}
        @rm -f build-tests
        @rm -f all