#[=======================================================================[.rst:
FindLibevent2
-------------

Find the Libevent2 library. For now this finds the core library only.

Imported targets
^^^^^^^^^^^^^^^^

This module defines the following :prop_tgt:`IMPORTED` targets:

``Libevent2::Libevent_core``
  The Libevent2 library, if found.

Result variables
^^^^^^^^^^^^^^^^

This module will set the following variables in your project:

``Libevent2_FOUND``
  If false, do not try to use Libevent2.
``LIBEVENT2_INCLUDE_DIR``
  where to find libevent headers.
``LIBEVENT2_LIBRARIES``
  the libraries needed to use Libevent2.
``LIBEVENT2_VERSION``
  the version of the Libevent2 library found

#]=======================================================================]

find_package(PkgConfig QUIET)
if (PKG_CONFIG_FOUND)
    pkg_check_modules(PkgLibevent IMPORTED_TARGET GLOBAL QUIET libevent>=2)
endif ()

if (PkgLibevent_FOUND)
  set(LIBEVENT2_INCLUDE_DIR ${PkgLibevent_INCLUDE_DIRS} CACHE FILEPATH "libevent2 include path")
  set(LIBEVENT2_LIBRARIES ${PkgLibevent_LIBRARIES} CACHE STRING "libevent2 libraries")
  set(LIBEVENT2_VERSION ${PkgLibevent_VERSION})
  add_library(Libevent2::Libevent_core ALIAS PkgConfig::PkgLibevent)
  set(Libevent2_FOUND ON)
else ()
  find_path(LIBEVENT2_INCLUDE_DIR event2/event.h
    HINTS
    "${LIBEVENT2_DIR}"
    "${LIBEVENT2_DIR}/include"
  )
  
  find_library(LIBEVENT2_LIBRARIES NAMES event_core libevent_core
    HINTS
    "${LIBEVENT2_DIR}"
    "${LIBEVENT2_DIR}/lib"
  )
  
  if (LIBEVENT2_INCLUDE_DIR AND LIBEVENT2_LIBRARIES)
    if (NOT TARGET Libevent2::Libevent_core)
      add_library(Libevent2::Libevent_core UNKNOWN IMPORTED)
      set_target_properties(Libevent2::Libevent_core PROPERTIES
        INTERFACE_INCLUDE_DIRECTORIES "${LIBEVENT2_INCLUDE_DIR}"
        IMPORTED_LINK_INTERFACE_LANGUAGES "C"
        IMPORTED_LOCATION "${LIBEVENT2_LIBRARIES}"
        )
    endif ()
  
    if (NOT LIBEVENT2_VERSION AND LIBEVENT2_INCLUDE_DIR AND EXISTS "${LIBEVENT2_INCLUDE_DIR}/event2/event.h")
      file(STRINGS "${LIBEVENT2_INCLUDE_DIR}/event2/event-config.h" LIBEVENT2_H REGEX "^#define _?EVENT_+VERSION ")
      string(REGEX REPLACE "^.*EVENT_+VERSION \"([^\"]+)\".*$" "\\1" LIBEVENT2_VERSION "${LIBEVENT2_H}")
    endif ()
  endif ()

  include(FindPackageHandleStandardArgs)
  find_package_handle_standard_args(Libevent2
    REQUIRED_VARS LIBEVENT2_LIBRARIES LIBEVENT2_INCLUDE_DIR
    VERSION_VAR LIBEVENT2_VERSION
  )
endif ()

mark_as_advanced(LIBEVENT2_INCLUDE_DIR LIBEVENT2_LIBRARIES)