# Copyright (c) 2017 Intel Corporation
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

if( Linux )
  set( os_arch "lin" )
elseif( Darwin )
  set( os_arch "darwin" )
elseif( Windows )
  set( os_arch "win" )
endif()

if( __ARCH MATCHES ia32)
  set( os_arch "${os_arch}_ia32" )
else()
  set( os_arch "${os_arch}_x64" )
endif()

if( CMAKE_MFX_HOME )
  set( MFX_API_HOME ${CMAKE_MFX_HOME} )
else()
  set( MFX_API_HOME $ENV{MFX_HOME} )
endif()

find_path( MFX_INCLUDE mfxdefs.h PATHS ${MFX_API_HOME}/include )
find_library( MFX_LIBRARY libmfx.a PATHS ${MFX_API_HOME}/lib PATH_SUFFIXES ${os_arch} )

if( NOT MFX_INCLUDE MATCHES NOTFOUND )
  include_directories( ${MFX_API_HOME}/mediasdk_structures )
  include_directories( ${MFX_INCLUDE} )
endif()

if( NOT MFX_LIBRARY MATCHES NOTFOUND )
  get_filename_component( MFX_LIBRARY_PATH ${MFX_LIBRARY} PATH )
  link_directories( ${MFX_LIBRARY_PATH} )
endif()

if( NOT MFX_INCLUDE MATCHES NOTFOUND )
  set( MFX_FOUND TRUE )
  include_directories( ${MFX_INCLUDE} )
endif()

if( NOT DEFINED MFX_FOUND )
  message( FATAL_ERROR "Intel(R) Media SDK was not found (required)! Set/check MFX_HOME environment variable!")
else()
  message( STATUS "Intel(R) Media SDK was found here $ENV{MFX_HOME}")
endif()

if( NOT MFX_LIBRARY MATCHES NOTFOUND )
  get_filename_component(MFX_LIBRARY_PATH ${MFX_LIBRARY} PATH )
  link_directories( ${MFX_LIBRARY_PATH} )
endif()

# Potential source of confusion here. Environment $MFX_VERSION translates to product name (strings libmfxhw64.so | grep mediasdk),
# but macro definition MFX_VERSION should contain API version i.e. 1025 for API 1.25
if( NOT DEFINED API OR $API STREQUAL "master")
  set(API_FLAGS "")  
else( )
  set( VERSION_REGEX "[0-9]+\\.[0-9]+" )

  # Breaks up a string in the form maj.min into two parts and stores
  # them in major, minor.  version should be a value, not a
  # variable, while major and minor should be variables.
  macro( split_api_version version major minor )
    if(${version} MATCHES ${VERSION_REGEX})
      string(REGEX REPLACE "^([0-9]+)\\.[0-9]+" "\\1" ${major} "${version}")
      string(REGEX REPLACE "^[0-9]+\\.([0-9]+)" "\\1" ${minor} "${version}")
    else(${version} MATCHES ${VERSION_REGEX})
      message("macro( split_api_version ${version} ${major} ${minor} ")
      message(FATAL_ERROR "Problem parsing API version string.")
    endif(${version} MATCHES ${VERSION_REGEX})
  endmacro( split_api_version )

  split_api_version(${API} major_vers minor_vers)
    # Compute a version number
  math(EXPR version_number "${major_vers} * 1000 + ${minor_vers}" )
  set(API_FLAGS -DMFX_VERSION=${version_number})
endif()

message(STATUS "Enabling API ${major_vers}.${minor_vers} feature set with flags ${API_FLAGS}")

if( Linux )
  set( MFX_LDFLAGS "-Wl,--default-symver" )
endif()
