# select_library_configurations( basename )
#
# This macro takes a library base name as an argument, and will choose good
# values for basename_LIBRARY, basename_LIBRARIES, basename_LIBRARY_DEBUG, and
# basename_LIBRARY_RELEASE depending on what has been found and set.  If only
# basename_LIBRARY_RELEASE is defined, basename_LIBRARY, basename_LIBRARY_DEBUG,
# and basename_LIBRARY_RELEASE will be set to the release value.  If only
# basename_LIBRARY_DEBUG is defined, then basename_LIBRARY,
# basename_LIBRARY_DEBUG and basename_LIBRARY_RELEASE will take the debug value.  
#
# If the generator supports configuration types, then basename_LIBRARY and
# basename_LIBRARIES will be set with debug and optimized flags specifying the
# library to be used for the given configuration.  If no build type has been set
# or the generator in use does not support configuration types, then
# basename_LIBRARY and basename_LIBRARIES will take only the release values.

# This macro was adapted from the FindQt4 CMake module and is maintained by Will
# Dicharry <wdicharry@stellarscience.com>.

# Utility macro to check if one variable exists while another doesn't, and set
# one that doesn't exist to the one that exists.
macro( _set_library_name basename GOOD BAD )
    if( ${basename}_LIBRARY_${GOOD} AND NOT ${basename}_LIBRARY_${BAD} )
        set( ${basename}_LIBRARY_${BAD} ${${basename}_LIBRARY_${GOOD}} )
        set( ${basename}_LIBRARY ${${basename}_LIBRARY_${GOOD}} )
        set( ${basename}_LIBRARIES ${${basename}_LIBRARY_${GOOD}} )
    endif( ${basename}_LIBRARY_${GOOD} AND NOT ${basename}_LIBRARY_${BAD} )
endmacro( _set_library_name )

macro( select_library_configurations basename )
    # if only the release version was found, set the debug to be the release
    # version.
    _set_library_name( ${basename} RELEASE DEBUG )
    # if only the debug version was found, set the release value to be the
    # debug value.
    _set_library_name( ${basename} DEBUG RELEASE )
    if (${basename}_LIBRARY_DEBUG AND ${basename}_LIBRARY_RELEASE )
        # if the generator supports configuration types or CMAKE_BUILD_TYPE
        # is set, then set optimized and debug options.
        if( CMAKE_CONFIGURATION_TYPES OR CMAKE_BUILD_TYPE )
            set( ${basename}_LIBRARY 
                optimized ${${basename}_LIBRARY_RELEASE}
                debug ${${basename}_LIBRARY_DEBUG} )
            set( ${basename}_LIBRARIES 
                optimized ${${basename}_LIBRARY_RELEASE}
                debug ${${basename}_LIBRARY_DEBUG} )
        else( CMAKE_CONFIGURATION_TYPES OR CMAKE_BUILD_TYPE )
            # If there are no configuration types or build type, just use
            # the release version
            set( ${basename}_LIBRARY ${${basename}_LIBRARY_RELEASE} )
            set( ${basename}_LIBRARIES ${${basename}_LIBRARY_RELEASE} )
        endif( CMAKE_CONFIGURATION_TYPES OR CMAKE_BUILD_TYPE )
    endif( ${basename}_LIBRARY_DEBUG AND ${basename}_LIBRARY_RELEASE )

    set( ${basename}_LIBRARY ${${basename}_LIBRARY} CACHE FILEPATH 
        "The ${basename} library" )

    if( ${basename}_LIBRARY )
        set( ${basename}_FOUND TRUE )
    endif( ${basename}_LIBRARY )

    mark_as_advanced( ${basename}_LIBRARY 
        ${basename}_LIBRARY_RELEASE
        ${basename}_LIBRARY_DEBUG
    )
endmacro( select_library_configurations )

