# Copyright 2016 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#

##############################
# Check for system libcodec2 #
##############################

if(NOT PKG_CONFIG_FOUND)
  INCLUDE(FindPkgConfig)
endif()
INCLUDE(FindPackageHandleStandardArgs)

pkg_check_modules(LIBCODEC2_PKG QUIET codec2)

find_path(LIBCODEC2_INCLUDE_DIR NAMES codec2.h
  HINTS ${LIBCODEC2_PKG_INCLUDE_DIRS}
  PATHS
  /usr/include
  /usr/local/include
  PATH_SUFFIXES codec2
  )

find_library(LIBCODEC2_LIBRARIES NAMES codec2 libcodec2
  HINTS ${LIBCODEC2_PKG_LIBRARY_DIRS}
  PATHS
  /usr/lib
  /usr/local/lib
  )

if(LIBCODEC2_INCLUDE_DIR AND LIBCODEC2_LIBRARIES)
  set(LIBCODEC2_FOUND TRUE)
  set(LIBCODEC2_INCLUDE_DIRS ${LIBCODEC2_INCLUDE_DIR})
  set(LIBCODEC2_LIBRARIES ${LIBCODEC2_LIBRARIES} ${LIBCODEC2_LIBRARY})
  file(READ "${LIBCODEC2_INCLUDE_DIR}/codec2.h" _CODEC2_H_CONTENTS)
  string(REGEX MATCHALL "CODEC2_MODE[_a-z0-9A-Z]+" CODEC2_MODES "${_CODEC2_H_CONTENTS}")
  foreach(mode ${CODEC2_MODES})
    set(LIBCODEC2_HAS_${mode} True)
  endforeach()
  if(EXISTS "${LIBCODEC2_INCLUDE_DIR}/freedv_api.h")
    set(LIBCODEC2_HAS_FREEDV_API True)
    file(READ "${LIBCODEC2_INCLUDE_DIR}/freedv_api.h" _FREEDV_API_H_CONTENTS)
    string(REGEX MATCHALL "FREEDV_MODE[_a-z0-9A-Z]+" FREEDV_MODES "${_FREEDV_API_H_CONTENTS}")
    foreach(mode ${FREEDV_MODES})
      set(LIBCODEC2_HAS_${mode} True)
    endforeach()
  else()
    set(LIBCODEC2_HAS_FREEDV_API false)
  endif()

  # we need to discover if codec2 < 0.9
  # moreover, codec2 < 0.8 doesn't provide codec2/version.h
  if(EXISTS "${LIBCODEC2_INCLUDE_DIRS}/version.h")
    file(READ "${LIBCODEC2_INCLUDE_DIRS}/version.h" _CODEC2_VERSION_H_CONTENTS)
    string(REGEX MATCH "CODEC2_VERSION_MAJOR ([0-9]+)(.*)CODEC2_VERSION_MINOR ([0-9]+)" _CODEC2_TMP_MATCH " ${_CODEC2_VERSION_H_CONTENTS}")
    if((CMAKE_MATCH_1 EQUAL 0) AND (CMAKE_MATCH_3 LESS 9))
      add_definitions(-DCODEC2_LEGACY)
    endif()
  else()
    add_definitions(-DCODEC2_LEGACY)
  endif()
endif(LIBCODEC2_INCLUDE_DIR AND LIBCODEC2_LIBRARIES)

FIND_PACKAGE_HANDLE_STANDARD_ARGS(Codec2 DEFAULT_MSG LIBCODEC2_LIBRARIES LIBCODEC2_INCLUDE_DIRS)
mark_as_advanced(LIBCODEC2_INCLUDE_DIR LIBCODEC2_LIBRARIES)

if (LIBCODEC2_FOUND AND NOT TARGET CODEC2::CODEC2)
  add_library(CODEC2::CODEC2 INTERFACE IMPORTED)
  set_target_properties(CODEC2::CODEC2 PROPERTIES
    INTERFACE_INCLUDE_DIRECTORIES "${LIBCODEC2_INCLUDE_DIRS}"
    INTERFACE_LINK_LIBRARIES "${LIBCODEC2_LIBRARIES}"
  )
endif()
