###########################################################
#                  Find OpenCV Library
# See http://sourceforge.net/projects/opencvlibrary/
#----------------------------------------------------------
#
## 1: Setup:
# The following variables are optionally searched for defaults
#  OpenCV_DIR:            Base directory of OpenCv tree to use.
#
## 2: Variable
# The following are set after configuration is done:
#
#  OpenCV_FOUND
#  OpenCV_LIBS
#  OpenCV_INCLUDE_DIR
#  OpenCV_VERSION (OpenCV_VERSION_MAJOR, OpenCV_VERSION_MINOR, OpenCV_VERSION_PATCH)
#
#
# Deprecated variable are used to maintain backward compatibility with
# the script of Jan Woetzel (2006/09): www.mip.informatik.uni-kiel.de/~jw
#  OpenCV_INCLUDE_DIRS
#  OpenCV_LIBRARIES
#  OpenCV_LINK_DIRECTORIES
#
## 3: Version
#
# 2010/04/07 Benoit Rat, Correct a bug when OpenCVConfig.cmake is not found.
# 2010/03/24 Benoit Rat, Add compatibility for when OpenCVConfig.cmake is not found.
# 2010/03/22 Benoit Rat, Creation of the script.
#
#
# tested with:
# - OpenCV 2.1:  MinGW, MSVC2008
# - OpenCV 2.0:  MinGW, MSVC2008, GCC4
#
#
## 4: Licence:
#
# LGPL 2.1 : GNU Lesser General Public License Usage
# Alternatively, this file may be used under the terms of the GNU Lesser

# General Public License version 2.1 as published by the Free Software
# Foundation and appearing in the file LICENSE.LGPL included in the
# packaging of this file.  Please review the following information to
# ensure the GNU Lesser General Public License version 2.1 requirements
# will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
#
#----------------------------------------------------------

if (ANDROID)
  set(OpenCV_SDK_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/android/${ANDROID_ABI}/OpenCV/sdk/native/jni" CACHE PATH "OpenCV SDK path" FORCE)
elseif(WIN32 AND (WIN64 OR (CMAKE_SIZEOF_VOID_P EQUAL 8)))
  set(OpenCV_SDK_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/windows/x64/OpenCV" CACHE PATH "OpenCV SDK path" FORCE)
elseif(WIN32)
  set(OpenCV_SDK_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/windows/x86/OpenCV" CACHE PATH "OpenCV SDK path" FORCE)
elseif(APPLE AND NOT APPLE_IOS)
  set(OpenCV_SDK_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/apple/OSX/OpenCV" CACHE PATH "OpenCV SDK path" FORCE)
elseif(APPLE AND APPLE_IOS)
  set(OpenCV_SDK_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/apple/IOS/OpenCV" CACHE PATH "OpenCV SDK path" FORCE)
elseif(EMSCRIPTEN)
  set(OpenCV_SDK_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/emscripten/OpenCV" CACHE PATH "OpenCV SDK path" FORCE)
elseif(PIZERO)
  set(OpenCV_SDK_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/RPIZERO/OpenCV" CACHE PATH "OpenCV SDK path" FORCE)
elseif(PITHREE)
  set(OpenCV_SDK_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/RPI3/OpenCV" CACHE PATH "OpenCV SDK path" FORCE)
elseif(PIFOUR)
  set(OpenCV_SDK_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/RPI4/OpenCV" CACHE PATH "OpenCV SDK path" FORCE)
elseif(RPI)
  set(OpenCV_SDK_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/RPI2/OpenCV" CACHE PATH "OpenCV SDK path" FORCE)
elseif(LINUX32)
  set(OpenCV_SDK_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/linux32/OpenCV" CACHE PATH "OpenCV SDK path" FORCE)
elseif(LINUX64)
  set(OpenCV_SDK_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/linux64/OpenCV" CACHE PATH "OpenCV SDK path" FORCE)
else(SCOL_INSTALL_PREFIX)
  set(OpenCV_SDK_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/${SCOL_INSTALL_PREFIX}/OpenCV" CACHE PATH "OpenCV SDK path" FORCE)
endif()

message(STATUS "trying to find opencv in ${OpenCV_SDK_DIR}")

# On IOS, OpenCV is provided as a framework file
find_path(OpenCV_DIR "OpenCVConfig.cmake" DOC "Root directory of OpenCV" PATH ${OpenCV_SDK_DIR} ${OpenCV_SDK_DIR}/share/OpenCV ${OpenCV_SDK_DIR}/lib/cmake/opencv4 NO_CMAKE_FIND_ROOT_PATH)
message(STATUS "found OpenCV_DIR in ${OpenCV_DIR}")

##====================================================
## Find OpenCV libraries
##----------------------------------------------------
if(EXISTS "${OpenCV_DIR}")

        #When its possible to use the Config script use it.
        if(EXISTS "${OpenCV_DIR}/OpenCVConfig.cmake")

                ## Include the standard CMake script
                include("${OpenCV_DIR}/OpenCVConfig.cmake")

                ## Search for a specific version
                set(CVLIB_SUFFIX "${OpenCV_VERSION_MAJOR}${OpenCV_VERSION_MINOR}${OpenCV_VERSION_PATCH}")

        #Otherwise it try to guess it.
        else(EXISTS "${OpenCV_DIR}/OpenCVConfig.cmake")

                set(OPENCV_LIB_COMPONENTS cxcore cv ml highgui cvaux)
                find_path(OpenCV_INCLUDE_DIR "opencv2/opencv.hpp" PATHS "${OpenCV_DIR}" PATH_SUFFIXES "include" "include" "include/opencv4" DOC "")
                if(EXISTS  ${OpenCV_INCLUDE_DIR})
                        include_directories(${OpenCV_INCLUDE_DIR})
                endif(EXISTS  ${OpenCV_INCLUDE_DIR})

                #Find OpenCV version by looking at version.hpp
                file(STRINGS ${OpenCV_INCLUDE_DIR}/core/version.hpp.h OpenCV_VERSIONS_TMP REGEX "^#define CV_[A-Z]+_VERSION[ \t]+[0-9]+$")
                string(REGEX REPLACE ".*#define CV_MAJOR_VERSION[ \t]+([0-9]+).*" "\\1" OpenCV_VERSION_MAJOR ${OpenCV_VERSIONS_TMP})
                string(REGEX REPLACE ".*#define CV_MINOR_VERSION[ \t]+([0-9]+).*" "\\1" OpenCV_VERSION_MINOR ${OpenCV_VERSIONS_TMP})
                string(REGEX REPLACE ".*#define CV_SUBMINOR_VERSION[ \t]+([0-9]+).*" "\\1" OpenCV_VERSION_PATCH ${OpenCV_VERSIONS_TMP})
                set(OpenCV_VERSION ${OpenCV_VERSION_MAJOR}.${OpenCV_VERSION_MINOR}.${OpenCV_VERSION_PATCH} CACHE STRING "" FORCE)
                set(CVLIB_SUFFIX "${OpenCV_VERSION_MAJOR}${OpenCV_VERSION_MINOR}${OpenCV_VERSION_PATCH}")

        endif(EXISTS "${OpenCV_DIR}/OpenCVConfig.cmake")

        if (OpenCV_VERSION)
          set(OpenCV_FOUND TRUE CACHE BOOL "" FORCE)
        endif()

else(EXISTS "${OpenCV_DIR}")
        set(ERR_MSG "Please specify OpenCV directory using OpenCV_DIR env. variable")
endif(EXISTS "${OpenCV_DIR}")
##====================================================
if(IOS)
# OpenCV depends on several frameworks, we need to link against them in static builds
  if (Scol_STATIC)
    include(AppleMacros)
    find_apple_system_fwk(AVFOUNDATION_FWK AVFoundation)
    find_apple_system_fwk(COREVIDEO_FWK CoreVideo)
    find_apple_system_fwk(COREMEDIA_FWK CoreMedia)
    if (NOT (AVFOUNDATION_FWK AND COREVIDEO_FWK AND COREMEDIA_FWK))
      set(OpenCV_FOUND FALSE)
    else()
      set(OpenCV_LIBS ${OpenCV_LIBS} ${AVFOUNDATION_FWK} ${COREMEDIA_FWK} ${COREVIDEO_FWK})
    endif()
  endif(Scol_STATIC)
endif(IOS)

##====================================================
## Print message
##----------------------------------------------------
if(NOT OpenCV_FOUND)
        # make FIND_PACKAGE friendly
        if(NOT OpenCV_FIND_QUIETLY)
                if(OpenCV_FIND_REQUIRED)
                        message(FATAL_ERROR "OpenCV required but some headers or libs not found. ${ERR_MSG}")
                else(OpenCV_FIND_REQUIRED)
                        message(STATUS "WARNING: OpenCV was not found. ${ERR_MSG}")
                endif(OpenCV_FIND_REQUIRED)
        endif(NOT OpenCV_FIND_QUIETLY)
endif(NOT OpenCV_FOUND)
##====================================================