if [ ! -d "build" ]; then
  mkdir build
fi

OS=Linux
COMPILE=gcc
OBJ_POSTFIX=.o
EXE_POSTFIX=
FLAGS=
FLAG_OBJ="-c -o "
FLAG_EXE="-o "
LINK_FLAGS="-lm -lX11 -lXi -lXcursor -lGL"

if    [ "$2" = "gcc" ]; then
  COMPILE=gcc
elif  [ "$2" = "clang" ]; then
  COMPILE=clang
elif  [ "$2" = "msvc" ]; then
  COMPILE=cl.exe
  OBJ_POSTFIX=.obj
  FLAG_OBJ="-c -Fo"
  FLAG_EXE="-Fe"
elif  [ "$2" != "" ]; then
  echo "Unknown C compiler"
  exit 1
fi

if [ "$2" != "" ]; then
  if command -v $COMPILE >/dev/null 2>&1; then
    echo "C compiler found"
  else
    echo "C compiler not found"
    exit 1
  fi
fi

case $(uname | tr '[:upper:]' '[:lower:]') in
  *darwin*)
    OS=macOS
    if [ "$2" = "" ]; then
      if    command -v clang >/dev/null 2>&1; then
        echo "C compiler found - Clang"
        COMPILE=clang
      elif  command -v gcc >/dev/null 2>&1; then
        echo "C compiler found - GCC"
      else
        echo "C compiler not found"
        exit 1
      fi
    fi
    ;;
  *msys*|*cygwin*|*mingw*|*nt*|*win*)
    OS=Windows
    EXE_POSTFIX=.exe
    if [ "$2" = "" ]; then
      if    command -v cl.exe >/dev/null 2>&1; then
        echo "C compiler found - MSVC"
        COMPILE=cl.exe
        OBJ_POSTFIX=.obj
        FLAG_OBJ="-c -Fo"
        FLAG_EXE="-Fe"
      elif  command -v gcc >/dev/null 2>&1; then
        echo "C compiler found - GCC"
      elif  command -v clang >/dev/null 2>&1; then
        echo "C compiler found - Clang"
        COMPILE=clang
      else
        echo "C compiler not found"
        exit 1
      fi
    fi
    if [ "$COMPILE" = "cl.exe" ]; then
      LINK_FLAGS="Shlwapi.lib Advapi32.lib"
    else
      LINK_FLAGS="-lShlwapi -lAdvapi32"
    fi
    ;;
  *)
    if [ "$2" = "" ]; then
      if    command -v gcc >/dev/null 2>&1; then
        echo "C compiler found - GCC"
      elif  command -v clang >/dev/null 2>&1; then
        echo "C compiler found - Clang"
        COMPILE=clang
      else
        echo "C compiler not found"
        exit 1
      fi
    fi
    ;;
esac

if [ "$COMPILE" = "gcc" ] || [ "$COMPILE" = "clang" ]; then
  if    [ "$1" = "release" ]; then
    FLAGS="-O3"
  elif  [ "$COMPILE" = "gcc" ] && [ "$OS" != "Windows" ]; then
    FLAGS="-O0 -fsanitize=undefined,address,leak"
  elif  [ "$OS" != "Windows" ]; then
    FLAGS="-O0 -fsanitize=undefined,address"
  else
    FLAGS="-O0"
  fi
else
  if [ "$1" = "release" ]; then
    FLAGS="-O2"
  else
    FLAGS="-Od"
  fi
fi

echo ""

echo "Build saw"
if  [ !                     -f  "build/saw_impl${OBJ_POSTFIX}" ] || \
    [ "source/saw/_impl.c"  -nt "build/saw_impl${OBJ_POSTFIX}" ]; then
  $COMPILE ${FLAGS} \
    ${FLAG_OBJ}"build/saw_impl${OBJ_POSTFIX}" \
    "source/saw/_impl.c"
  if [ $? -ne 0 ]; then
    exit 1
  fi
fi
$COMPILE ${FLAGS} \
  ${FLAG_EXE}"build/saw${EXE_POSTFIX}" \
  "build/saw_impl${OBJ_POSTFIX}" \
  "source/saw/_exe.c" \
  ${LINK_FLAGS}
if [ $? -ne 0 ]; then
  exit 1
fi

echo "Build saw_test_suite"
$COMPILE ${FLAGS} \
  ${FLAG_EXE}"build/saw_test_suite${EXE_POSTFIX}" \
  "source/tests/_exe.c" \
  ${LINK_FLAGS}
if [ $? -ne 0 ]; then
  exit 1
fi

echo "Run tests"
echo ""

STATUS=0

./build/saw_test_suite
if [ $? -ne 0 ]; then
  STATUS=1
fi

exit $STATUS