## Once run this will define:
##
## QGIS_FOUND            = system has QGIS lib
##
## QGIS_CORE_LIBRARY     = full path to the CORE library
## QGIS_GUI_LIBRARY      = full path to the GUI library
## QGIS_ANALYSIS_LIBRARY = full path to the ANALYSIS library
## QGIS_PLUGIN_DIR       = full path to where QGIS plugins are installed
## QGIS_INCLUDE_DIR      = where to find headers
## QGIS_UI_INCLUDE_DIR   = where to find ui_* generated headers
##
## QGIS_VERSION          = version as defined in qgsconfig.h, as major.minor.patch
##
## Definitions or ENV variables affecting search locations
##
## OSGEO4W_ROOT          = [A-Z]:/path/to/OSGeo4W/install/root
##                               (^ use forward slashes!)
## OSGEO4W_QGIS_SUBDIR   = qgis[-rel|-ltr][-dev], in OSGEO4W_ROOT/apps/
## QGIS_MAC_PATH         = /path/to/any/QGIS.app/Contents
## QGIS_BUILD_PATH       = [A-Z:]/path/to/QGIS/build/directory
##
## Tim Sutton
## Larry Shaffer (2017-01-31)

#MESSAGE("Searching for QGIS")
IF(WIN32)
  # OSGEO4W_QGIS_SUBDIR relative install: qgis[-rel|-ltr][-dev], etc.
  IF (NOT OSGEO4W_QGIS_SUBDIR OR "${OSGEO4W_QGIS_SUBDIR}" STREQUAL "")
    IF (NOT "$ENV{OSGEO4W_QGIS_SUBDIR}" STREQUAL "")
      SET (OSGEO4W_QGIS_SUBDIR $ENV{OSGEO4W_QGIS_SUBDIR})
    ELSE ()
      SET (OSGEO4W_QGIS_SUBDIR qgis)
    ENDIF ()
  ENDIF ()

  #MESSAGE("Searching for QGIS in $ENV{PROGRAMFILES}/QGIS")
  IF (MINGW)
    FIND_PATH(QGIS_PLUGIN_DIR
      NAMES libofflineeditingplugin.dll
      PATHS
        "$ENV{PROGRAMFILES}/QGIS/plugins"
    )
    FIND_PATH(QGIS_INCLUDE_DIR
      NAMES qgsapplication.h
      PATHS
        "$ENV{PROGRAMFILES}/QGIS/include"
    )
    FIND_LIBRARY(QGIS_CORE_LIBRARY
      NAMES qgis_core
      PATHS
        "$ENV{PROGRAMFILES}/QGIS/"
    )
    FIND_LIBRARY(QGIS_GUI_LIBRARY
      NAMES qgis_gui
      PATHS
        "$ENV{PROGRAMFILES}/QGIS/"
    )
  ENDIF (MINGW)

  IF (MSVC)
    FIND_PATH(QGIS_PLUGIN_DIR
      NAMES offlineeditingplugin.dll
      PATHS
        "$ENV{OSGEO4W_ROOT}/apps/${OSGEO4W_QGIS_SUBDIR}/plugins"
        "$ENV{PROGRAMFILES}/QGIS/plugins"
    )
    FIND_PATH(QGIS_INCLUDE_DIR
      NAMES qgsapplication.h
      PATHS
        "$ENV{INCLUDE}"
        "$ENV{LIB_DIR}/include/qgis"
        "$ENV{OSGEO4W_ROOT}/include"
        "$ENV{OSGEO4W_ROOT}/apps/${OSGEO4W_QGIS_SUBDIR}/include"
        "$ENV{PROGRAMFILES}/QGIS/include"
    )
    FIND_LIBRARY(QGIS_CORE_LIBRARY
      NAMES qgis_core
      PATHS
        "$ENV{LIB_DIR}/lib/"
        "$ENV{LIB}"
        "$ENV{OSGEO4W_ROOT}/lib"
        "$ENV{OSGEO4W_ROOT}/apps/${OSGEO4W_QGIS_SUBDIR}/lib"
        "$ENV{PROGRAMFILES}/QGIS/lib"
    )
    FIND_LIBRARY(QGIS_GUI_LIBRARY
      NAMES qgis_gui
      PATHS
        "$ENV{LIB_DIR}"
        "$ENV{LIB}"
        "$ENV{OSGEO4W_ROOT}/lib"
        "$ENV{OSGEO4W_ROOT}/apps/${OSGEO4W_QGIS_SUBDIR}/lib"
        "$ENV{PROGRAMFILES}/QGIS/lib"
    )
    FIND_LIBRARY(QGIS_ANALYSIS_LIBRARY
      NAMES qgis_analysis
      PATHS
        "$ENV{LIB_DIR}"
        "$ENV{LIB}"
        "$ENV{OSGEO4W_ROOT}/lib"
        "$ENV{OSGEO4W_ROOT}/apps/${OSGEO4W_QGIS_SUBDIR}/lib"
        "$ENV{PROGRAMFILES}/QGIS/lib"
    )
  ENDIF (MSVC)
ELSE(WIN32)
  IF(UNIX)
    #MESSAGE("Searching for QGIS in /usr/bin; /usr/local/bin")
    FIND_PATH(QGIS_PLUGIN_DIR
      NAMES libofflineeditingplugin.so
      PATHS
        ${QGIS_BUILD_PATH}/PlugIns/qgis
        ${QGIS_MAC_PATH}/PlugIns/qgis
        ${QGIS_PREFIX_PATH}/lib/qgis/plugins/
        /usr/lib64/qgis/plugins
        /usr/lib/qgis
        /usr/lib/qgis/plugins
        /usr/local/lib/qgis/plugins
        "$ENV{LIB_DIR}/lib/qgis/plugins"
        "$ENV{LIB_DIR}/lib/qgis"
    )
    FIND_PATH(QGIS_INCLUDE_DIR
      NAMES qgis.h
      PATHS
        ${QGIS_BUILD_PATH}/output/lib/qgis_core.framework/Headers
        ${QGIS_MAC_PATH}/Frameworks/qgis_core.framework/Headers
        {QGIS_PREFIX_PATH}/include/qgis
        /usr/include/qgis
        /usr/local/include/qgis
        /Library/Frameworks/qgis_core.framework/Headers
        "$ENV{LIB_DIR}/include/qgis"
    )
    FIND_PATH(QGIS_UI_INCLUDE_DIR
      NAMES ui_qgscredentialdialog.h
      PATHS
        ${QGIS_BUILD_PATH}/src/ui
        ${QGIS_MAC_PATH}/Frameworks/qgis_gui.framework/Headers
        {QGIS_PREFIX_PATH}/include/qgis
        /usr/include/qgis
        /usr/local/include/qgis
        /Library/Frameworks/qgis_gui.framework/Headers
        "$ENV{LIB_DIR}/include/qgis"
    )
    # also get other frameworks' headers folders on OS X
    IF (APPLE)
      FIND_PATH(QGIS_GUI_INCLUDE_DIR
        NAMES qgsguiutils.h
        PATHS
          ${QGIS_BUILD_PATH}/output/lib
          ${QGIS_MAC_PATH}/Frameworks
          /Library/Frameworks
          PATH_SUFFIXES qgis_gui.framework/Headers
      )
      FIND_PATH(QGIS_ANALYSIS_INCLUDE_DIR
        NAMES qgsinterpolator.h
        PATHS
          ${QGIS_BUILD_PATH}/output/lib
          ${QGIS_MAC_PATH}/Frameworks
          /Library/Frameworks
          PATH_SUFFIXES qgis_analysis.framework/Headers
      )
      SET(QGIS_INCLUDE_DIR
        ${QGIS_INCLUDE_DIR}
        ${QGIS_GUI_INCLUDE_DIR}
        ${QGIS_ANALYSIS_INCLUDE_DIR}
        ${QGIS_UI_INCLUDE_DIR}
      )
    ENDIF (APPLE)

    FIND_LIBRARY(QGIS_CORE_LIBRARY
      NAMES qgis_core
      PATHS
        ${QGIS_BUILD_PATH}/output/lib
        ${QGIS_MAC_PATH}/Frameworks
        ${QGIS_MAC_PATH}/lib
        ${QGIS_PREFIX_PATH}/lib/
        /usr/lib64
        /usr/lib
        /usr/local/lib
        /Library/Frameworks
        "$ENV{LIB_DIR}/lib/"
    )
    FIND_LIBRARY(QGIS_GUI_LIBRARY
      NAMES qgis_gui
      PATHS
        ${QGIS_BUILD_PATH}/output/lib
        ${QGIS_MAC_PATH}/Frameworks
        ${QGIS_MAC_PATH}/lib
        ${QGIS_PREFIX_PATH}/lib/
        /usr/lib64
        /usr/lib
        /usr/local/lib
        /Library/Frameworks
        "$ENV{LIB_DIR}/lib/"
    )
    FIND_LIBRARY(QGIS_ANALYSIS_LIBRARY
      NAMES qgis_analysis
      PATHS
        ${QGIS_BUILD_PATH}/output/lib
        ${QGIS_MAC_PATH}/Frameworks
        ${QGIS_MAC_PATH}/lib
        ${QGIS_PREFIX_PATH}/lib/
        /usr/lib64
        /usr/lib
        /usr/local/lib
        /Library/Frameworks
        "$ENV{LIB_DIR}/lib/"
    )
  ENDIF(UNIX)
ENDIF(WIN32)

IF (QGIS_INCLUDE_DIR)
  SET(QGIS_VERSION QGIS_VERSION-NOTFOUND)
  FIND_FILE(_qgsconfig_h qgsconfig.h PATHS ${QGIS_INCLUDE_DIR})
  IF (_qgsconfig_h)
    FILE(READ ${_qgsconfig_h} _qgsconfig)
    IF (_qgsconfig)
      # version defined like #define VERSION "2.14.8-Essen"
      FILE(STRINGS "${_qgsconfig_h}" _qgsversion_str REGEX "^#define VERSION .*$")
      STRING(REGEX REPLACE "^#define VERSION +\"([0-9]+\\.[0-9]+\\.[0-9]+).*$" "\\1" _qgsversion "${_qgsversion_str}")
      IF (_qgsversion)
        SET(QGIS_VERSION ${_qgsversion})
      ELSE ()
        MESSAGE(WARNING "No QGIS version determined: failed to parse qgsconfig.h")
      ENDIF ()
    ELSE()
      MESSAGE(WARNING "No QGIS version determined: failed to read qgsconfig.h")
    ENDIF ()
  ELSE ()
    MESSAGE(WARNING "No QGIS version determined: failed to find qgsconfig.h")
  ENDIF ()
ENDIF ()

IF (QGIS_INCLUDE_DIR AND QGIS_CORE_LIBRARY AND QGIS_GUI_LIBRARY AND QGIS_ANALYSIS_LIBRARY)
   SET(QGIS_FOUND TRUE)
ENDIF ()

IF (QGIS_FOUND)
   IF (NOT QGIS_FIND_QUIETLY)
     MESSAGE(STATUS "Found QGIS: ${QGIS_VERSION}")
     MESSAGE(STATUS "Found QGIS core: ${QGIS_CORE_LIBRARY}")
     MESSAGE(STATUS "Found QGIS gui: ${QGIS_GUI_LIBRARY}")
     MESSAGE(STATUS "Found QGIS analysis: ${QGIS_ANALYSIS_LIBRARY}")
     MESSAGE(STATUS "Found QGIS plugins directory: ${QGIS_PLUGIN_DIR}")
   ENDIF (NOT QGIS_FIND_QUIETLY)
ELSE (QGIS_FOUND)
   IF (QGIS_FIND_REQUIRED)
      MESSAGE(FATAL_ERROR "Could not find QGIS")
   ENDIF (QGIS_FIND_REQUIRED)
ENDIF (QGIS_FOUND)