option(GeographicLib_PREFER_PACKAGE_CONFIG "Prefer CMake config mode" ON)
mark_as_advanced(GeographicLib_PREFER_PACKAGE_CONFIG)

if(GeographicLib_PREFER_PACKAGE_CONFIG)
    find_package(GeographicLib ${GeographicLib_FIND_VERSION} QUIET CONFIG)
    if (GeographicLib_FOUND)
        message(STATUS "GeographicLib: using found CMake configuration")
        return()
    endif()
endif()
message(STATUS "GeographicLib: using lookup code by Vanetza")

find_path(GeographicLib_INCLUDE_DIR NAMES GeographicLib/Config.h DOC "GeographicLib include directory")
find_library(GeographicLib_LIBRARY_RELEASE NAMES Geographic DOC "GeographicLib library (release)")
find_library(GeographicLib_LIBRARY_DEBUG NAMES Geographic_d DOC "GeographicLib library (debug)")

include(SelectLibraryConfigurations)
select_library_configurations(GeographicLib)

if(GeographicLib_INCLUDE_DIR)
    file(STRINGS ${GeographicLib_INCLUDE_DIR}/GeographicLib/Config.h _config_version REGEX "GEOGRAPHICLIB_VERSION_STRING")
    string(REGEX MATCH "\"([0-9.]+)\"$" _match_version ${_config_version})
    set(GeographicLib_VERSION_STRING ${CMAKE_MATCH_1})
endif()

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(GeographicLib
    REQUIRED_VARS GeographicLib_INCLUDE_DIR GeographicLib_LIBRARY
    FOUND_VAR GeographicLib_FOUND
    VERSION_VAR GeographicLib_VERSION_STRING)

if(GeographicLib_FOUND AND NOT TARGET GeographicLib::GeographicLib)
    add_library(GeographicLib::GeographicLib UNKNOWN IMPORTED)
    set_target_properties(GeographicLib::GeographicLib PROPERTIES
        INTERFACE_INCLUDE_DIRECTORIES "${GeographicLib_INCLUDE_DIR}"
        IMPORTED_LOCATION "${GeographicLib_LIBRARY}"
        IMPORTED_LINK_INTERFACE_LANGUAGES "CXX")
    if(EXISTS "${GeographicLib_LIBRARY_RELEASE}")
        set_property(TARGET GeographicLib::GeographicLib APPEND PROPERTY
            IMPORTED_CONFIGURATIONS RELEASE)
        set_target_properties(GeographicLib::GeographicLib PROPERTIES
            IMPORTED_LOCATION_RELEASE "${GeographicLib_LIBRARY_RELEASE}")
    endif()
    if(EXISTS "${GeographicLib_LIBRARY_DEBUG}")
        set_property(TARGET GeographicLib::GeographicLib APPEND PROPERTY
            IMPORTED_CONFIGURATIONS DEBUG)
        set_target_properties(GeographicLib::GeographicLib PROPERTIES
            IMPORTED_LOCATION_DEBUG "${GeographicLib_LIBRARY_DEBUG}")
    endif()
endif()

mark_as_advanced(GeographicLib_INCLUDE_DIR GeographicLib_LIBRARY)
set(GeographicLib_INCLUDE_DIRS ${GeographicLib_INCLUDE_DIR})
# GeographicLib_LIBRARIES is set by SelectLibraryConfigurations