# Finds the International Components for Unicode (ICU) Library
#
#  ICU_FOUND          - True if ICU found.
#  ICU_I18N_FOUND     - True if ICU's internationalization library found.
#  ICU_INCLUDE_DIRS   - Directory to include to get ICU headers
#                       Note: always include ICU headers as, e.g.,
#                       unicode/utypes.h
#  ICU_LIBRARIES      - Libraries to link against for the common ICU
#  ICU_I18N_LIBRARIES - Libraries to link against for ICU internationaliation
#                       (note: in addition to ICU_LIBRARIES)

# Look for the header file.
find_path(
  ICU_INCLUDE_DIR
  NAMES unicode/utypes.h
  DOC "Include directory for the ICU library")
mark_as_advanced(ICU_INCLUDE_DIR)

# Look for the library.
find_library(
  ICU_LIBRARY
  NAMES icuuc cygicuuc cygicuuc32
  DOC "Libraries to link against for the common parts of ICU")
mark_as_advanced(ICU_LIBRARY)

# Copy the results to the output variables.
if(ICU_INCLUDE_DIR AND ICU_LIBRARY)
  set(ICU_FOUND 1)
  set(ICU_LIBRARIES ${ICU_LIBRARY})
  set(ICU_INCLUDE_DIRS ${ICU_INCLUDE_DIR})

  set(ICU_VERSION 0)
  set(ICU_MAJOR_VERSION 0)
  set(ICU_MINOR_VERSION 0)
  if (EXISTS "${ICU_INCLUDE_DIR}/unicode/uvernum.h")
    FILE(READ "${ICU_INCLUDE_DIR}/unicode/uvernum.h" _ICU_VERSION_CONENTS)
  else()
    FILE(READ "${ICU_INCLUDE_DIR}/unicode/uversion.h" _ICU_VERSION_CONENTS)
  endif()

  STRING(REGEX REPLACE ".*#define U_ICU_VERSION_MAJOR_NUM ([0-9]+).*" "\\1" ICU_MAJOR_VERSION "${_ICU_VERSION_CONENTS}")
  STRING(REGEX REPLACE ".*#define U_ICU_VERSION_MINOR_NUM ([0-9]+).*" "\\1" ICU_MINOR_VERSION "${_ICU_VERSION_CONENTS}")

  set(ICU_VERSION "${ICU_MAJOR_VERSION}.${ICU_MINOR_VERSION}")

  # Look for the ICU internationalization libraries
  find_library(
    ICU_I18N_LIBRARY
    NAMES icuin icui18n cygicuin cygicuin32
    DOC "Libraries to link against for ICU internationalization")
  mark_as_advanced(ICU_I18N_LIBRARY)
  if (ICU_I18N_LIBRARY)
    set(ICU_I18N_FOUND 1)
    set(ICU_I18N_LIBRARIES ${ICU_I18N_LIBRARY})
  else (ICU_I18N_LIBRARY)
    set(ICU_I18N_FOUND 0)
    set(ICU_I18N_LIBRARIES)
  endif (ICU_I18N_LIBRARY)

  # Look for the ICU data libraries
  find_library(
      ICU_DATA_LIBRARY
    NAMES icudt icudata cygicudata cygicudata32
    DOC "Libraries to link against for ICU data")
  mark_as_advanced(ICU_DATA_LIBRARY)
  if (ICU_DATA_LIBRARY)
    set(ICU_DATA_FOUND 1)
    set(ICU_DATA_LIBRARIES ${ICU_DATA_LIBRARY})
  else (ICU_DATA_LIBRARY)
    set(ICU_DATA_FOUND 0)
    set(ICU_DATA_LIBRARIES)
  endif (ICU_DATA_LIBRARY)
else(ICU_INCLUDE_DIR AND ICU_LIBRARY)
  set(ICU_FOUND 0)
  set(ICU_I18N_FOUND 0)
  set(ICU_LIBRARIES)
  set(ICU_I18N_LIBRARIES)
  set(ICU_INCLUDE_DIRS)
  set(ICU_VERSION)
  set(ICU_MAJOR_VERSION)
  set(ICU_MINOR_VERSION)
endif(ICU_INCLUDE_DIR AND ICU_LIBRARY)

IF(ICU_FOUND)
  IF( NOT ICU_FIND_QUIETLY )
    MESSAGE( STATUS "Found ICU header files in ${ICU_INCLUDE_DIRS}")
    MESSAGE( STATUS "Found ICU libraries: ${ICU_LIBRARIES}")
  ENDIF( NOT ICU_FIND_QUIETLY )
ELSE(ICU_FOUND)
  IF(ICU_FIND_REQUIRED)
    MESSAGE( FATAL_ERROR "Could not find ICU" )
  ELSE(ICU_FIND_REQUIRED)
    MESSAGE( STATUS "Optional package ICU was not found" )
  ENDIF(ICU_FIND_REQUIRED)
ENDIF(ICU_FOUND)