find_package(PkgConfig)

if(PKG_CONFIG_FOUND)
    pkg_check_modules(libsodium libsodium)
endif()

if(NOT libsodium_FOUND)
    find_library(libsodium_LIBRARIES NAMES sodium)
    find_path(libsodium_INCLUDE_DIRS NAMES
        sodium.h
        sodium/version.h
        PATH_SUFFIXES include)

    if(libsodium_INCLUDE_DIRS)
        set(libsodium_VERSION ${libsodium_INCLUDE_DIRS}/sodium/version.h)

        if(NOT EXISTS ${libsodium_VERSION})
            message(FATAL_ERROR "Missing file: ${libsodium_VERSION}")
        endif()
    endif()

    file(STRINGS ${libsodium_VERSION} libsodium_VERSION_LINE REGEX "^#define[ \t]+SODIUM_VERSION_STRING[ \t]+\"[0-9\.]+\"$")
    set(libsodium_expr "^#define[ \t]+SODIUM_VERSION_STRING[ \t]+\"([0-9]+)\.([0-9]+)\.([0-9]+)\"$")
    string(REGEX REPLACE ${libsodium_expr} "\\1" libsodium_VERSION_MAJOR "${libsodium_VERSION_LINE}")
    string(REGEX REPLACE ${libsodium_expr} "\\2" libsodium_VERSION_MINOR "${libsodium_VERSION_LINE}")
    string(REGEX REPLACE ${libsodium_expr} "\\3" libsodium_VERSION_PATCH "${libsodium_VERSION_LINE}")
    set(libsodium_VERSION_STRING ${libsodium_VERSION_MAJOR}.${libsodium_VERSION_MINOR}.${libsodium_VERSION_PATCH})
    unset(libsodium_VERSION_MAJOR_LINE)
    unset(libsodium_VERSION_MINOR_LINE)
    unset(libsodium_VERSION_PATCH_LINE)
    unset(libsodium_VERSION_MAJOR)
    unset(libsodium_VERSION_MINOR)
    unset(libsodium_VERSION_PATCH)
    unset(libsodium_expr)

    if (libsodium_LIBRARIES STREQUAL "libsodium_LIBRARIES-NOTFOUND")
        message(FATAL_ERROR "libsodium not found")
    elseif (libsodium_INCLUDE_DIRS STREQUAL "libsodium_INCLUDE_DIRS-NOTFOUND")
        message(FATAL_ERROR "libsodium headers not found")
    endif()

    set(libsodium_LINK_LIBRARIES ${libsodium_LIBRARIES})
endif()

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(libsodium
    REQUIRED_VARS
        libsodium_LINK_LIBRARIES
        libsodium_INCLUDE_DIRS
    VERSION_VAR libsodium_VERSION_STRING
)

if(NOT TARGET libsodium)
    add_library(libsodium INTERFACE IMPORTED)
    set_target_properties(libsodium PROPERTIES
        INTERFACE_INCLUDE_DIRECTORIES ${libsodium_INCLUDE_DIRS}
        INTERFACE_LINK_LIBRARIES ${libsodium_LINK_LIBRARIES})
endif()