# Written in 2016 by Henrik Steffen Gaßmann <henrik@gassmann.onl>

#

# To the extent possible under law, the author(s) have dedicated all copyright

# and related and neighboring rights to this software to the public domain

# worldwide. This software is distributed without any warranty.

#

# You should have received a copy of the CC0 Public Domain Dedication along with

# this software. If not, see

#

# http://creativecommons.org/publicdomain/zero/1.0/

#

# ##############################################################################

# Tries to find the local libsodium installation.

#

# On Windows the sodium_DIR environment variable is used as a default hint which

# can be overridden by setting the corresponding cmake variable.

#

# Once done the following variables will be defined:

#

# sodium_FOUND sodium_INCLUDE_DIR sodium_LIBRARY_DEBUG sodium_LIBRARY_RELEASE

# sodium_VERSION_STRING

#

# Furthermore an imported "sodium" target is created.

#

if(CMAKE_C_COMPILER_ID STREQUAL "GNU" OR CMAKE_C_COMPILER_ID STREQUAL "Clang")

  set(_GCC_COMPATIBLE 1)

endif()

# static library option

if(NOT DEFINED sodium_USE_STATIC_LIBS)

  option(sodium_USE_STATIC_LIBS "enable to statically link against sodium" OFF)

endif()

if(NOT (sodium_USE_STATIC_LIBS EQUAL sodium_USE_STATIC_LIBS_LAST))

  unset(sodium_LIBRARY CACHE)

  unset(sodium_LIBRARY_DEBUG CACHE)

  unset(sodium_LIBRARY_RELEASE CACHE)

  unset(sodium_DLL_DEBUG CACHE)

  unset(sodium_DLL_RELEASE CACHE)

  set(sodium_USE_STATIC_LIBS_LAST

      ${sodium_USE_STATIC_LIBS}

      CACHE INTERNAL "internal change tracking variable")

endif()

# ##############################################################################

# UNIX

if(UNIX)

  # import pkg-config

  find_package(PkgConfig QUIET)

  if(PKG_CONFIG_FOUND)

    pkg_check_modules(sodium_PKG QUIET libsodium)

  endif()

  if(sodium_USE_STATIC_LIBS)

    if(sodium_PKG_STATIC_LIBRARIES)

      foreach(_libname ${sodium_PKG_STATIC_LIBRARIES})

        if(NOT _libname MATCHES "^lib.*\\.a$") # ignore strings already ending

                                               # with .a

          list(INSERT sodium_PKG_STATIC_LIBRARIES 0 "lib${_libname}.a")

        endif()

      endforeach()

      list(REMOVE_DUPLICATES sodium_PKG_STATIC_LIBRARIES)

    else()

      # if pkgconfig for libsodium doesn't provide static lib info, then

      # override PKG_STATIC here..

      set(sodium_PKG_STATIC_LIBRARIES libsodium.a)

    endif()

    set(XPREFIX sodium_PKG_STATIC)

  else()

    if(sodium_PKG_LIBRARIES STREQUAL "")

      set(sodium_PKG_LIBRARIES sodium)

    endif()

    set(XPREFIX sodium_PKG)

  endif()

  find_path(sodium_INCLUDE_DIR sodium.h HINTS ${${XPREFIX}_INCLUDE_DIRS})

  find_library(sodium_LIBRARY_DEBUG

               NAMES ${${XPREFIX}_LIBRARIES}

               HINTS ${${XPREFIX}_LIBRARY_DIRS})

  find_library(sodium_LIBRARY_RELEASE

               NAMES ${${XPREFIX}_LIBRARIES}

               HINTS ${${XPREFIX}_LIBRARY_DIRS})

  # ############################################################################

  # Windows

elseif(WIN32)

  set(sodium_DIR "$ENV{sodium_DIR}" CACHE FILEPATH "sodium install directory")

  mark_as_advanced(sodium_DIR)

  find_path(sodium_INCLUDE_DIR sodium.h

            HINTS ${sodium_DIR}

            PATH_SUFFIXES include)

  if(MSVC)

    # detect target architecture

    file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/arch.c" [=[

            #if defined _M_IX86

            #error ARCH_VALUE x86_32

            #elif defined _M_X64

            #error ARCH_VALUE x86_64

            #endif

            #error ARCH_VALUE unknown

        ]=])

    try_compile(_UNUSED_VAR "${CMAKE_CURRENT_BINARY_DIR}"

                "${CMAKE_CURRENT_BINARY_DIR}/arch.c"

                OUTPUT_VARIABLE _COMPILATION_LOG)

    string(REGEX

           REPLACE ".*ARCH_VALUE ([a-zA-Z0-9_]+).*"

                   "\\1"

                   _TARGET_ARCH

                   "${_COMPILATION_LOG}")

    # construct library path

    if(_TARGET_ARCH STREQUAL "x86_32")

      string(APPEND _PLATFORM_PATH "Win32")

    elseif(_TARGET_ARCH STREQUAL "x86_64")

      string(APPEND _PLATFORM_PATH "x64")

    else()

      message(

        FATAL_ERROR

          "the ${_TARGET_ARCH} architecture is not supported by Findsodium.cmake."

        )

    endif()

    string(APPEND _PLATFORM_PATH "/$$CONFIG$$")

    if(MSVC_VERSION LESS 1900)

      math(EXPR _VS_VERSION "${MSVC_VERSION} / 10 - 60")

    else()

      math(EXPR _VS_VERSION "${MSVC_VERSION} / 10 - 50")

    endif()

    string(APPEND _PLATFORM_PATH "/v${_VS_VERSION}")

    if(sodium_USE_STATIC_LIBS)

      string(APPEND _PLATFORM_PATH "/static")

    else()

      string(APPEND _PLATFORM_PATH "/dynamic")

    endif()

    string(REPLACE "$$CONFIG$$"

                   "Debug"

                   _DEBUG_PATH_SUFFIX

                   "${_PLATFORM_PATH}")

    string(REPLACE "$$CONFIG$$"

                   "Release"

                   _RELEASE_PATH_SUFFIX

                   "${_PLATFORM_PATH}")

    find_library(sodium_LIBRARY_DEBUG libsodium.lib

                 HINTS ${sodium_DIR}

                 PATH_SUFFIXES ${_DEBUG_PATH_SUFFIX})

    find_library(sodium_LIBRARY_RELEASE libsodium.lib

                 HINTS ${sodium_DIR}

                 PATH_SUFFIXES ${_RELEASE_PATH_SUFFIX})

    if(NOT sodium_USE_STATIC_LIBS)

      set(CMAKE_FIND_LIBRARY_SUFFIXES_BCK ${CMAKE_FIND_LIBRARY_SUFFIXES})

      set(CMAKE_FIND_LIBRARY_SUFFIXES ".dll")

      find_library(sodium_DLL_DEBUG libsodium

                   HINTS ${sodium_DIR}

                   PATH_SUFFIXES ${_DEBUG_PATH_SUFFIX})

      find_library(sodium_DLL_RELEASE libsodium

                   HINTS ${sodium_DIR}

                   PATH_SUFFIXES ${_RELEASE_PATH_SUFFIX})

      set(CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES_BCK})

    endif()

  elseif(_GCC_COMPATIBLE)

    if(sodium_USE_STATIC_LIBS)

      find_library(sodium_LIBRARY_DEBUG libsodium.a

                   HINTS ${sodium_DIR}

                   PATH_SUFFIXES lib)

      find_library(sodium_LIBRARY_RELEASE libsodium.a

                   HINTS ${sodium_DIR}

                   PATH_SUFFIXES lib)

    else()

      find_library(sodium_LIBRARY_DEBUG libsodium.dll.a

                   HINTS ${sodium_DIR}

                   PATH_SUFFIXES lib)

      find_library(sodium_LIBRARY_RELEASE libsodium.dll.a

                   HINTS ${sodium_DIR}

                   PATH_SUFFIXES lib)

      file(GLOB _DLL

           LIST_DIRECTORIES false

           RELATIVE "${sodium_DIR}/bin"

           "${sodium_DIR}/bin/libsodium*.dll")

      find_library(sodium_DLL_DEBUG ${_DLL} libsodium

                   HINTS ${sodium_DIR}

                   PATH_SUFFIXES bin)

      find_library(sodium_DLL_RELEASE ${_DLL} libsodium

                   HINTS ${sodium_DIR}

                   PATH_SUFFIXES bin)

    endif()

  else()

    message(FATAL_ERROR "this platform is not supported by FindSodium.cmake")

  endif()

  # ############################################################################

  # unsupported

else()

  message(FATAL_ERROR "this platform is not supported by FindSodium.cmake")

endif()

# ##############################################################################

# common stuff

# extract sodium version

if(sodium_INCLUDE_DIR)

  set(_VERSION_HEADER "${sodium_INCLUDE_DIR}/sodium/version.h")

  if(EXISTS "${_VERSION_HEADER}")

    file(READ "${_VERSION_HEADER}" _VERSION_HEADER_CONTENT)

    string(

      REGEX

      REPLACE

        ".*#[ \t]*define[ \t]*sodium_VERSION_STRING_STRING[ \t]*\"([^\n]*)\".*"

        "\\1"

        sodium_VERSION_STRING

        "${_VERSION_HEADER_CONTENT}")

    set(sodium_VERSION_STRING "${sodium_VERSION_STRING}")

  endif()

endif()

# communicate results

include(FindPackageHandleStandardArgs)

find_package_handle_standard_args(sodium

                                  REQUIRED_VARS

                                  sodium_LIBRARY_RELEASE

                                  sodium_LIBRARY_DEBUG

                                  sodium_INCLUDE_DIR

                                  VERSION_VAR

                                  sodium_VERSION_STRING)

# mark file paths as advanced

mark_as_advanced(sodium_INCLUDE_DIR)

mark_as_advanced(sodium_LIBRARY_DEBUG)

mark_as_advanced(sodium_LIBRARY_RELEASE)

if(WIN32)

  mark_as_advanced(sodium_DLL_DEBUG)

  mark_as_advanced(sodium_DLL_RELEASE)

endif()

# create imported target

if(sodium_USE_STATIC_LIBS)

  set(_LIB_TYPE STATIC)

else()

  set(_LIB_TYPE SHARED)

endif()

add_library(sodium ${_LIB_TYPE} IMPORTED)

set_target_properties(sodium

                      PROPERTIES INTERFACE_INCLUDE_DIRECTORIES

                                 "${sodium_INCLUDE_DIR}"

                                 IMPORTED_LINK_INTERFACE_LANGUAGES

                                 "C")

if(sodium_USE_STATIC_LIBS)

  set_target_properties(sodium

                        PROPERTIES INTERFACE_COMPILE_DEFINITIONS

                                   "SODIUM_STATIC"

                                   IMPORTED_LOCATION

                                   "${sodium_LIBRARY_RELEASE}"

                                   IMPORTED_LOCATION_DEBUG

                                   "${sodium_LIBRARY_DEBUG}")

else()

  if(UNIX)

    set_target_properties(sodium

                          PROPERTIES IMPORTED_LOCATION

                                     "${sodium_LIBRARY_RELEASE}"

                                     IMPORTED_LOCATION_DEBUG

                                     "${sodium_LIBRARY_DEBUG}")

  elseif(WIN32)

    set_target_properties(sodium

                          PROPERTIES IMPORTED_IMPLIB

                                     "${sodium_LIBRARY_RELEASE}"

                                     IMPORTED_IMPLIB_DEBUG

                                     "${sodium_LIBRARY_DEBUG}")

    if(NOT (sodium_DLL_DEBUG MATCHES ".*-NOTFOUND"))

      set_target_properties(sodium

                            PROPERTIES IMPORTED_LOCATION_DEBUG

                                       "${sodium_DLL_DEBUG}")

    endif()

    if(NOT (sodium_DLL_RELEASE MATCHES ".*-NOTFOUND"))

      set_target_properties(sodium

                            PROPERTIES IMPORTED_LOCATION_RELWITHDEBINFO

                                       "${sodium_DLL_RELEASE}"

                                       IMPORTED_LOCATION_MINSIZEREL

                                       "${sodium_DLL_RELEASE}"

                                       IMPORTED_LOCATION_RELEASE

                                       "${sodium_DLL_RELEASE}")

    endif()

  endif()

endif()