# 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)
    FILE(READ "${ICU_INCLUDE_DIR}/unicode/uversion.h" _ICU_VERSION_CONENTS)
    STRING(REGEX REPLACE ".*#define U_ICU_VERSION_MAJOR_NUM ([0-9]+).*" "\\1" ICU_MAJOR_VERSION "${_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 ()
        SET(ICU_I18N_FOUND 0)
        SET(ICU_I18N_LIBRARIES)
    ENDIF ()
ELSE ()
    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 ()

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 ()
ELSE ()
    IF (ICU_FIND_REQUIRED)
        MESSAGE(FATAL_ERROR "Could not find ICU")
    ELSE ()
        MESSAGE(STATUS "Optional package ICU was not found")
    ENDIF ()
ENDIF ()