# CAPABILITY TESTING MACROS
m4_define(
  [M4_HDF5_LIB],
  [
    cat > nptm_test_hdf5.cpp <<EOF
#include <hdf5.h>
int main(int argc, char **argv) {
  hid_t file_id = 0;
  herr_t status = H5Iis_valid(file_id);
  return (int)status;
}
EOF
    $CXX -o nptm_test_hdf5 nptm_test_hdf5.cpp -I$HDF5_INCLUDE -L$HDF5_LIB -lhdf5 > /dev/null 2>>error.log
    export TEST_HDF5_LIB=$?
    rm nptm_test_hdf5.cpp
    if test "x$TEST_HDF5_LIB" = "x0"; then
      rm nptm_test_hdf5
    fi
  ]
)

m4_define(
  [M4_DETECT_LAPACK],
  [
    export -p | grep MKL
    MKL_DEF=$?
    if test "x$MKL_DEF" = "x0"; then
      export LAPACKFLAGS="-DUSE_LAPACK -DLAPACK_ILP64 -DUSE_ILP64 -I{MKLROOT}/include"
      export LAPACKLDFLAGS="-L${MKLROOT}/lib -Wl,--no-as-needed -lmkl_intel_ilp64 -lmkl_gnu_thread -lmkl_core -lgomp -lpthread -lm -ldl"
    else
      if test -f /usr/include/lapacke.h; then
        export LAPACKFLAGS="-DUSE_LAPACK -DLAPACK_ILP64 -DUSE_ILP64"
	export LAPACKLDFLAGS="-llapacke64"
      fi
    fi
  ]
)

m4_define(
  [M4_DETECT_MAGMA],
  [
    if test "x$CUDA_LIB" = "x"; then
      export -p | grep CUDA
      CUDA_DEF=$?
      if test "x$CUDA_DEF" = "x0"; then
        CUDA_LIB=${CUDA_HOME}/targets/x86_64-linux/lib
      else
        CUDA_LIB=/usr/local/cuda/targets/x86_64-linux/lib
      fi
    fi
    export -p | grep MAGMA
    MAGMA_DEF=$?
    if test "x$MAGMA_DEF" = "x0"; then
      export MAGMAFLAGS="-DUSE_MAGMA -DMAGMA_ILP64 -I${MAGMA_INCLUDE}"
      export MAGMALDFLAGS="-L${CUDA_LIB} -lcudart -L${MAGMA_LIB} -lmagma"
    else
      if test "x$MAGMA_INCLUDE" != "x"; then
        export MAGMAFLAGS="-DUSE_MAGMA -DMAGMA_ILP64 -I${MAGMA_INCLUDE}"
      else
        if test -f /usr/include/magma_v2.h; then
          export MAGMAFLAGS="-DUSE_MAGMA -DMAGMA_ILP64"
	fi
      fi
      if test "x$MAGMA_LIB" != "x"; then
        export MAGMALDFLAGS="-L${CUDA_LIB} -lcudart -L${MAGMA_LIB} -lmagma"
      else
        if test -f /usr/include/magma_v2.h; then
          export MAGMALDFLAGS="-L${CUDA_LIB} -lcudart -lmagma"
	fi
      fi
    fi
  ]
)
# END CAPABILITY TESTING MACROS

# autoconf setup initialization
AC_INIT([np_tmcode], [8.04], [giovanni.lamura@inaf.it])

# Folder structure safety check
AC_CONFIG_SRCDIR([../src/libnptm/TransitionMatrix.cpp])

# Auxiliary build folder
AC_CONFIG_AUX_DIR([build_aux])

# automake initialization
AM_INIT_AUTOMAKE([-Wall -Werror foreign])

# Compiler detection
AM_PROG_AR
AC_ARG_ENABLE(
  [mpi],
  [AS_HELP_STRING([--enable-mpi], [enable MPI compilation [default=auto]])],
  [
    if test "x$enableval" = "xno"; then
      AC_PROG_CXX([g++ clang])
      AC_MSG_NOTICE([Using $CXX])
      AC_SUBST([MPIFLAGS], [""])
    elif test "x$enableval" = "xauto"; then
      AC_PROG_CXX([mpicxx mpic++ mpiCC])
      if test "x$CXX" != "x"; then
        AC_SUBST([MPIFLAGS], [-DUSE_MPI])
      else
        AC_PROG_CXX([g++ clang])
        AC_SUBST([MPIFLAGS], [""])
      fi
    elif test "x$enableval" = "xyes"; then
      AC_PROG_CXX([mpicxx mpic++ mpiCC])
      if test "x$CXX" != "x"; then
        AC_SUBST([MPIFLAGS], [-DUSE_MPI])
      else
        AC_MSG_ERROR([MPI was requested, but no MPI compiler detected!])
      fi
    fi
  ],
  [
    AC_PROG_CXX([mpicxx mpic++ mpiCC])
    if test "x$CXX" != "x"; then
      AC_SUBST([MPIFLAGS], [-DUSE_MPI])
    else
      AC_PROG_CXX([g++ clang])
      AC_SUBST([MPIFLAGS], [""])
      AC_MSG_NOTICE([Using $CXX])
    fi
  ]
)
AC_PROG_F77([gfortran f77])

# Libtool initialization
LT_INIT

# Environment setup
AS_IF(
  [test "x$HDF5_INCLUDE" = "x"],
  [AC_SUBST([HDF5_INCLUDE], ["/usr/include/hdf5/serial"])],
  [AC_MSG_NOTICE([HDF5_INCLUDE=$(HDF5_INCLUDE)])]
)
AS_IF(
  [test "x$HDF5_LIB" = "x"],
  [AC_SUBST([HDF5_LIB], ["/usr/lib/x86_64-linux-gnu/hdf5/serial"])],
  [AC_MSG_NOTICE([HDF5_LIB=$(HDF5_LIB)])]
)

# Check for required headers
AC_CHECK_HEADER(
  [$HDF5_INCLUDE/hdf5.h],
  ,
  AC_MSG_ERROR(["Could not find HDF5 headers!]),
)

# Check for required libraries
M4_HDF5_LIB
AS_IF(
  [test "x$TEST_HDF5_LIB" = "x0"],
  [AC_SUBST([HDF5_LDFLAGS], ["-L${HDF5_LIB} -lhdf5"])],
  [AC_MSG_ERROR(["HDF5 library not found!"])]
)

# Configure the optional features
M4_DETECT_LAPACK
AS_IF(
  [test "x$LAPACKLDFLAGS" != "x"],
  [AC_MSG_NOTICE([LAPACK detected. Activating by default (use --without-lapack to disable).])],
  [AC_MSG_NOTICE([No LAPACK found.])]
)

M4_DETECT_MAGMA
AS_IF(
  [test "x$MAGMALDFLAGS" != "x"],
  [AC_MSG_NOTICE([MAGMA detected. Activating by default (use --without-magma to disable).])],
  [AC_MSG_NOTICE([MAGMA not found.])]
)

AC_ARG_ENABLE(
  [openmp],
  [AS_HELP_STRING([--enable-openmp], [enable OpneMP multi-threading [default=yes]])],
  [
    if test "x$enableval" != "xno"; then
      AC_SUBST([OMPFLAGS], ["-fopenmp"])
    fi
  ],
  [
    AC_SUBST([OMPFLAGS], ["-fopenmp"])
  ]
)

AC_ARG_WITH(
  [lapack],
  [AS_HELP_STRING([--with-lapack], [use LAPACK @<:@default=check@:>@])],
  [
    if test "x$withval" = "xno"; then
      AC_SUBST([LAPACKFLAGS], [""])
      AC_SUBST([LAPACKLDFLAGS], [""])
    else
      AC_SUBST([LAPACKFLAGS], [${LAPACKFLAGS}])
      AC_SUBST([LAPACKLDFLAGS], [${LAPACKLDFLAGS}])
    fi
  ],
  [
    AC_SUBST([LAPACKFLAGS], [${LAPACKFLAGS}])
    AC_SUBST([LAPACKLDFLAGS], [${LAPACKLDFLAGS}])
  ]
)

AC_ARG_WITH(
  [magma],
  [AS_HELP_STRING([--with-magma], [use MAGMA @<:@default=check@:>@])],
  [
    if test "x$withval" = "xno"; then
      AC_SUBST([MAGMAFLAGS], [""])
      AC_SUBST([MAGMALDFLAGS], [""])
    else
      AC_SUBST([MAGMAFLAGS], [${MAGMAFLAGS}])
      AC_SUBST([MAGMALDFLAGS], [${MAGMALDFLAGS}])
    fi
  ],
  [
    AC_SUBST([MAGMAFLAGS], [${MAGMAFLAGS}])
    AC_SUBST([MAGMALDFLAGS], [${MAGMALDFLAGS}])
  ]
)

FFLAGS="-std=legacy -O3"
CXXFLAGS="-O3 -ggdb -I$HDF5_INCLUDE $MPIFLAGS $OMPFLAGS $LAPACKFLAGS $MAGMAFLAGS"
SUBDIRS="cluster libnptm sphere testing trapping"

# Send output to Makefiles
AC_CONFIG_FILES([Makefile])

# Generate the output
AC_OUTPUT