# This program is free software, licensed under the terms of the GNU GPL.
# See the Bongo COPYING file for full details.
# Copyright (c) 2026 Bongo Project contributors

# Locate the validating Unbound resolver library.

find_package(PkgConfig QUIET)
if(PkgConfig_FOUND)
  pkg_check_modules(PC_UNBOUND QUIET libunbound)
  if(NOT PC_UNBOUND_FOUND)
    pkg_check_modules(PC_UNBOUND QUIET unbound)
  endif()
endif()

find_path(Unbound_INCLUDE_DIR NAMES unbound.h
  HINTS ${PC_UNBOUND_INCLUDEDIR} ${PC_UNBOUND_INCLUDE_DIRS})
find_library(Unbound_LIBRARY NAMES unbound
  HINTS ${PC_UNBOUND_LIBDIR} ${PC_UNBOUND_LIBRARY_DIRS})

set(Unbound_VERSION "${PC_UNBOUND_VERSION}")
if(Unbound_INCLUDE_DIR AND NOT Unbound_VERSION
   AND EXISTS "${Unbound_INCLUDE_DIR}/unbound.h")
  file(STRINGS "${Unbound_INCLUDE_DIR}/unbound.h" _UNBOUND_VERSION_LINES
    REGEX "^#define UNBOUND_VERSION_(MAJOR|MINOR|MICRO) [0-9]+$")
  foreach(_component MAJOR MINOR MICRO)
    foreach(_line IN LISTS _UNBOUND_VERSION_LINES)
      if(_line MATCHES
         "^#define UNBOUND_VERSION_${_component} ([0-9]+)$")
        set(_UNBOUND_VERSION_${_component} "${CMAKE_MATCH_1}")
      endif()
    endforeach()
  endforeach()
  if(DEFINED _UNBOUND_VERSION_MAJOR
     AND DEFINED _UNBOUND_VERSION_MINOR
     AND DEFINED _UNBOUND_VERSION_MICRO)
    set(Unbound_VERSION
      "${_UNBOUND_VERSION_MAJOR}.${_UNBOUND_VERSION_MINOR}.${_UNBOUND_VERSION_MICRO}")
  endif()
endif()

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Unbound
  REQUIRED_VARS Unbound_LIBRARY Unbound_INCLUDE_DIR
  VERSION_VAR Unbound_VERSION)

if(Unbound_FOUND AND NOT TARGET Unbound::Unbound)
  add_library(Unbound::Unbound UNKNOWN IMPORTED)
  set_target_properties(Unbound::Unbound PROPERTIES
    IMPORTED_LOCATION "${Unbound_LIBRARY}"
    INTERFACE_INCLUDE_DIRECTORIES "${Unbound_INCLUDE_DIR}")
  if(PC_UNBOUND_CFLAGS_OTHER)
    set_property(TARGET Unbound::Unbound PROPERTY
      INTERFACE_COMPILE_OPTIONS "${PC_UNBOUND_CFLAGS_OTHER}")
  endif()
endif()

mark_as_advanced(Unbound_INCLUDE_DIR Unbound_LIBRARY)