# - Try to find CFITSIO.
# Variables used by this module:
#  CFITSIO_ROOT_DIR     - CFITSIO root directory
# Variables defined by this module:
#  CFITSIO_FOUND        - system has CFITSIO
#  CFITSIO_INCLUDE_DIR  - the CFITSIO include directory (cached)
#  CFITSIO_INCLUDE_DIRS - the CFITSIO include directories
#                         (identical to CFITSIO_INCLUDE_DIR)
#  CFITSIO_LIBRARY      - the CFITSIO library (cached)
#  CFITSIO_LIBRARIES    - the CFITSIO libraries
#                         (identical to CFITSIO_LIBRARY)
#  CFITSIO_VERSION_STRING the found version of CFITSIO, padded to 3 digits

# Copyright (C) 2009
# ASTRON (Netherlands Institute for Radio Astronomy)
# P.O.Box 2, 7990 AA Dwingeloo, The Netherlands
#
# This file is part of the LOFAR software suite.
# The LOFAR software suite is free software: you can redistribute it and/or
# modify it under the terms of the GNU General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# The LOFAR software suite is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with the LOFAR software suite. If not, see <http://www.gnu.org/licenses/>.
#
# $Id$

if(NOT CFITSIO_FOUND)

  find_path(CFITSIO_INCLUDE_DIR fitsio.h
    HINTS ${CFITSIO_ROOT_DIR} PATH_SUFFIXES include include/cfitsio
             include/libcfitsio0)

  if(CFITSIO_INCLUDE_DIR)
    FILE(READ "${CFITSIO_INCLUDE_DIR}/fitsio.h" CFITSIO_H)
    set(CFITSIO_VERSION_REGEX ".*#define CFITSIO_VERSION[^0-9]*([0-9]+)\\.([0-9]+).*")
    if ("${CFITSIO_H}" MATCHES ${CFITSIO_VERSION_REGEX})
      # Pad CFITSIO minor version to three digit because 3.181 is older than 3.35
      STRING(REGEX REPLACE ${CFITSIO_VERSION_REGEX}
                           "\\1.\\200" CFITSIO_VERSION_STRING "${CFITSIO_H}")
      STRING(SUBSTRING ${CFITSIO_VERSION_STRING} 0 5 CFITSIO_VERSION_STRING)
      STRING(REGEX REPLACE "^([0-9]+)[.]([0-9]+)" "\\1" CFITSIO_VERSION_MAJOR ${CFITSIO_VERSION_STRING})
      # CFITSIO_VERSION_MINOR will contain 80 for 3.08, 181 for 3.181 and 200 for 3.2
      STRING(REGEX REPLACE "^([0-9]+)[.]0*([0-9]+)" "\\2" CFITSIO_VERSION_MINOR ${CFITSIO_VERSION_STRING})
    else ()
      set(CFITSIO_VERSION_STRING "Unknown")
    endif()
  endif(CFITSIO_INCLUDE_DIR)

  find_library(CFITSIO_LIBRARY cfitsio
    HINTS ${CFITSIO_ROOT_DIR} PATH_SUFFIXES lib)
  find_library(M_LIBRARY m)
  mark_as_advanced(CFITSIO_INCLUDE_DIR CFITSIO_LIBRARY M_LIBRARY)

  if(CMAKE_VERSION VERSION_LESS "2.8.3")
    find_package_handle_standard_args(CFITSIO DEFAULT_MSG
      CFITSIO_LIBRARY M_LIBRARY CFITSIO_INCLUDE_DIR)
  else ()
    include(FindPackageHandleStandardArgs)
    find_package_handle_standard_args(CFITSIO
      REQUIRED_VARS CFITSIO_LIBRARY M_LIBRARY CFITSIO_INCLUDE_DIR
      VERSION_VAR CFITSIO_VERSION_STRING)
  endif ()

  set(CFITSIO_INCLUDE_DIRS ${CFITSIO_INCLUDE_DIR})
  set(CFITSIO_LIBRARIES ${CFITSIO_LIBRARY} ${M_LIBRARY})

endif(NOT CFITSIO_FOUND)