# Copyright (c) 2018 Ribose Inc.
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#
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#.rst:
# FindBotan2
# -----------
#
# Find the botan-2 library.
#
# IMPORTED Targets
# ^^^^^^^^^^^^^^^^
#
# This module defines :prop_tgt:`IMPORTED` targets:
#
# ``Botan2::Botan2``
#   The botan-2 library, if found.
#
# Result variables
# ^^^^^^^^^^^^^^^^
#
# This module defines the following variables:
#
# ::
#
#   BOTAN2_FOUND          - true if the headers and library were found
#   BOTAN2_INCLUDE_DIRS   - where to find headers
#   BOTAN2_LIBRARIES      - list of libraries to link
#   BOTAN2_VERSION        - library version that was found, if any

# use pkg-config to get the directories and then use these values
# in the find_path() and find_library() calls
find_package(PkgConfig QUIET)
pkg_check_modules(PC_BOTAN2 QUIET botan-2)

# find the headers
find_path(BOTAN2_INCLUDE_DIR
  NAMES botan/version.h
  HINTS
    ${PC_BOTAN2_INCLUDEDIR}
    ${PC_BOTAN2_INCLUDE_DIRS}
  PATH_SUFFIXES botan-2
)

# find the library
find_library(BOTAN2_LIBRARY
  NAMES botan-2 libbotan-2 botan
  HINTS
    ${PC_BOTAN2_LIBDIR}
    ${PC_BOTAN2_LIBRARY_DIRS}
)

# determine the version
if(PC_BOTAN2_VERSION)
    set(BOTAN2_VERSION ${PC_BOTAN2_VERSION})
elseif(BOTAN2_INCLUDE_DIR AND EXISTS "${BOTAN2_INCLUDE_DIR}/botan/build.h")
    file(STRINGS "${BOTAN2_INCLUDE_DIR}/botan/build.h" botan2_version_str
      REGEX "^#define[\t ]+(BOTAN_VERSION_[A-Z]+)[\t ]+[0-9]+")

    string(REGEX REPLACE ".*#define[\t ]+BOTAN_VERSION_MAJOR[\t ]+([0-9]+).*"
           "\\1" _botan2_version_major "${botan2_version_str}")
    string(REGEX REPLACE ".*#define[\t ]+BOTAN_VERSION_MINOR[\t ]+([0-9]+).*"
           "\\1" _botan2_version_minor "${botan2_version_str}")
    string(REGEX REPLACE ".*#define[\t ]+BOTAN_VERSION_PATCH[\t ]+([0-9]+).*"
           "\\1" _botan2_version_patch "${botan2_version_str}")
    set(BOTAN2_VERSION "${_botan2_version_major}.${_botan2_version_minor}.${_botan2_version_patch}"
                       CACHE INTERNAL "The version of Botan which was detected")
endif()

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Botan2
  REQUIRED_VARS BOTAN2_LIBRARY BOTAN2_INCLUDE_DIR
  VERSION_VAR BOTAN2_VERSION
)

if (BOTAN2_FOUND)
  set(BOTAN2_INCLUDE_DIRS ${BOTAN2_INCLUDE_DIR} ${PC_BOTAN2_INCLUDE_DIRS})
  set(BOTAN2_LIBRARIES ${BOTAN2_LIBRARY})
endif()

if (BOTAN2_FOUND AND NOT TARGET Botan2::Botan2)
  # create the new library target
  add_library(Botan2::Botan2 UNKNOWN IMPORTED)
  # set the required include dirs for the target
  if (BOTAN2_INCLUDE_DIRS)
    set_target_properties(Botan2::Botan2
      PROPERTIES
        INTERFACE_INCLUDE_DIRECTORIES "${BOTAN2_INCLUDE_DIRS}"
    )
  endif()
  # set the required libraries for the target
  if (EXISTS "${BOTAN2_LIBRARY}")
    set_target_properties(Botan2::Botan2
      PROPERTIES
        IMPORTED_LINK_INTERFACE_LANGUAGES "C"
        IMPORTED_LOCATION "${BOTAN2_LIBRARY}"
    )
  endif()
endif()

mark_as_advanced(BOTAN2_INCLUDE_DIR BOTAN2_LIBRARY)