# DateToSpine is distributed as a source-complete offline project. Configuration
# must fail when a vendored dependency is missing; it must never fetch one.
set(FETCHCONTENT_FULLY_DISCONNECTED ON CACHE BOOL
    "Never download dependencies while configuring DateToSpine" FORCE)
set(FETCHCONTENT_UPDATES_DISCONNECTED ON CACHE BOOL
    "Never update dependencies while configuring DateToSpine" FORCE)

function(dts_require_vendored_spine version_line runtime_subdirectory)
    set(version_root
        "${CMAKE_CURRENT_SOURCE_DIR}/third_party/spine-runtimes/${version_line}")
    set(runtime_root "${version_root}/${runtime_subdirectory}")
    foreach(required_file IN ITEMS
            "${version_root}/LICENSE"
            "${runtime_root}/include/spine/spine.h")
        if(NOT EXISTS "${required_file}")
            message(FATAL_ERROR
                "Offline dependency is incomplete: ${required_file}\n"
                "Restore the vendored files from the DateToSpine source package. "
                "CMake will not download them.")
        endif()
    endforeach()
endfunction()

dts_require_vendored_spine("3.8" "spine-cpp/spine-cpp")
dts_require_vendored_spine("4.0" "spine-cpp/spine-cpp")
dts_require_vendored_spine("4.1" "spine-cpp/spine-cpp")
dts_require_vendored_spine("4.2" "spine-cpp/spine-cpp")
dts_require_vendored_spine("4.3" "spine-cpp")