macro(set_option_category name)
    set(MEGASEARCH_OPTION_CATEGORY ${name})
    list(APPEND "MEGASEARCH_OPTION_CATEGORIES" ${name})
endmacro()

macro(define_option name description default)
    option(${name} ${description} ${default})
    list(APPEND "MEGASEARCH_${MEGASEARCH_OPTION_CATEGORY}_OPTION_NAMES" ${name})
    set("${name}_OPTION_DESCRIPTION" ${description})
    set("${name}_OPTION_DEFAULT" ${default})
    set("${name}_OPTION_TYPE" "bool")
endmacro()

function(list_join lst glue out)
    if("${${lst}}" STREQUAL "")
        set(${out} "" PARENT_SCOPE)
        return()
    endif()

    list(GET ${lst} 0 joined)
    list(REMOVE_AT ${lst} 0)
    foreach(item ${${lst}})
        set(joined "${joined}${glue}${item}")
    endforeach()
    set(${out} ${joined} PARENT_SCOPE)
endfunction()

macro(define_option_string name description default)
    set(${name} ${default} CACHE STRING ${description})
    list(APPEND "MEGASEARCH_${MEGASEARCH_OPTION_CATEGORY}_OPTION_NAMES" ${name})
    set("${name}_OPTION_DESCRIPTION" ${description})
    set("${name}_OPTION_DEFAULT" "\"${default}\"")
    set("${name}_OPTION_TYPE" "string")

    set("${name}_OPTION_ENUM" ${ARGN})
    list_join("${name}_OPTION_ENUM" "|" "${name}_OPTION_ENUM")
    if(NOT ("${${name}_OPTION_ENUM}" STREQUAL ""))
        set_property(CACHE ${name} PROPERTY STRINGS ${ARGN})
    endif()
endmacro()

#----------------------------------------------------------------------
set_option_category("Thirdparty")

set(MEGASEARCH_DEPENDENCY_SOURCE_DEFAULT "AUTO")

define_option_string(MEGASEARCH_DEPENDENCY_SOURCE
                    "Method to use for acquiring MEGASEARCH's build dependencies"
                    "${MEGASEARCH_DEPENDENCY_SOURCE_DEFAULT}"
                    "AUTO"
                    "BUNDLED"
                    "SYSTEM")

define_option(MEGASEARCH_VERBOSE_THIRDPARTY_BUILD
        "Show output from ExternalProjects rather than just logging to files" OFF)

define_option(MEGASEARCH_BOOST_USE_SHARED "Rely on boost shared libraries where relevant" OFF)

define_option(MEGASEARCH_BOOST_VENDORED "Use vendored Boost instead of existing Boost. \
Note that this requires linking Boost statically" ON)

define_option(MEGASEARCH_BOOST_HEADER_ONLY "Use only BOOST headers" OFF)

define_option(MEGASEARCH_WITH_BZ2 "Build with BZ2 compression" ON)

define_option(MEGASEARCH_WITH_EASYLOGGINGPP "Build with Easylogging++ library" ON)

define_option(MEGASEARCH_WITH_FAISS "Build with FAISS library" ON)

define_option(MEGASEARCH_WITH_FAISS_GPU_VERSION "Build with FAISS GPU version" ON)

define_option_string(MEGASEARCH_FAISS_GPU_ARCH "Specifying which GPU architectures to build against"
        "-gencode=arch=compute_61,code=sm_61")

define_option(MEGASEARCH_WITH_LAPACK "Build with LAPACK library" ON)

define_option(MEGASEARCH_WITH_LZ4 "Build with lz4 compression" ON)

define_option(MEGASEARCH_WITH_OPENBLAS "Build with OpenBLAS library" ON)

define_option(MEGASEARCH_WITH_ROCKSDB "Build with RocksDB library" ON)

define_option(MEGASEARCH_WITH_SNAPPY "Build with Snappy compression" ON)

define_option(MEGASEARCH_WITH_SQLITE "Build with SQLite library" ON)

define_option(MEGASEARCH_WITH_SQLITE_ORM "Build with SQLite ORM library" ON)

define_option(MEGASEARCH_WITH_THRIFT "Build with Apache Thrift library" ON)

define_option(MEGASEARCH_WITH_YAMLCPP "Build with yaml-cpp library" ON)

define_option(MEGASEARCH_WITH_ZLIB "Build with zlib compression" ON)

if(CMAKE_VERSION VERSION_LESS 3.7)
    set(MEGASEARCH_WITH_ZSTD_DEFAULT OFF)
else()
    # ExternalProject_Add(SOURCE_SUBDIR) is available since CMake 3.7.
    set(MEGASEARCH_WITH_ZSTD_DEFAULT ON)
endif()
define_option(MEGASEARCH_WITH_ZSTD "Build with zstd compression" ${MEGASEARCH_WITH_ZSTD_DEFAULT})

#----------------------------------------------------------------------
if(MSVC)
    set_option_category("MSVC")

    define_option(MSVC_LINK_VERBOSE
            "Pass verbose linking options when linking libraries and executables"
            OFF)

    define_option(MEGASEARCH_USE_STATIC_CRT "Build MEGASEARCH with statically linked CRT" OFF)
endif()


#----------------------------------------------------------------------
#set_option_category("Test and benchmark")
#
#define_option(MEGASEARCH_BUILD_TESTS "Build the MEGASEARCH googletest unit tests" ON)

#----------------------------------------------------------------------
macro(config_summary)
    message(STATUS "---------------------------------------------------------------------")
    message(STATUS "MEGASEARCH version:                                 ${MEGASEARCH_VERSION}")
    message(STATUS)
    message(STATUS "Build configuration summary:")

    message(STATUS "  Generator: ${CMAKE_GENERATOR}")
    message(STATUS "  Build type: ${CMAKE_BUILD_TYPE}")
    message(STATUS "  Source directory: ${CMAKE_CURRENT_SOURCE_DIR}")
    if(${CMAKE_EXPORT_COMPILE_COMMANDS})
        message(
                STATUS "  Compile commands: ${CMAKE_CURRENT_BINARY_DIR}/compile_commands.json")
    endif()

    foreach(category ${MEGASEARCH_OPTION_CATEGORIES})

        message(STATUS)
        message(STATUS "${category} options:")

        set(option_names ${MEGASEARCH_${category}_OPTION_NAMES})

        set(max_value_length 0)
        foreach(name ${option_names})
            string(LENGTH "\"${${name}}\"" value_length)
            if(${max_value_length} LESS ${value_length})
                set(max_value_length ${value_length})
            endif()
        endforeach()

        foreach(name ${option_names})
            if("${${name}_OPTION_TYPE}" STREQUAL "string")
                set(value "\"${${name}}\"")
            else()
                set(value "${${name}}")
            endif()

            set(default ${${name}_OPTION_DEFAULT})
            set(description ${${name}_OPTION_DESCRIPTION})
            string(LENGTH ${description} description_length)
            if(${description_length} LESS 70)
                string(
                        SUBSTRING
                        "                                                                     "
                        ${description_length} -1 description_padding)
            else()
                set(description_padding "
                ")
            endif()

            set(comment "[${name}]")

            if("${value}" STREQUAL "${default}")
                set(comment "[default] ${comment}")
            endif()

            if(NOT ("${${name}_OPTION_ENUM}" STREQUAL ""))
                set(comment "${comment} [${${name}_OPTION_ENUM}]")
            endif()

            string(
                    SUBSTRING "${value}                                                             "
                    0 ${max_value_length} value)

            message(STATUS "  ${description} ${description_padding} ${value} ${comment}")
        endforeach()

    endforeach()

endmacro()