# searches for the installed Qt-Version and desides which FindQtX.cmake to include
#
# This module uses
# QT_MAX_VERSION		,maximum Qt version set by YOU (e.g. "3.9.9")
#					if it is not set, we assume (for compatibility) the project is old and uses Qt < 4
#					Qt > 3 projects have to (!) set QT_MAX_VERSION (maximum by Trolltech is "15.7.99")
# QT_MIN_VERSION		,minimum Qt version set by YOU (e.g. "2.2.3")
#
# This modules sets
# QT_INST_MAJOR_VERSION		,major number of the installed Qt (e.g. Qt-Version = 4.2.6 => 4)
# QT_INST_MINOR_VERSION		,minor number of the installed Qt (e.g. Qt-Version = 4.2.6 => 2)
# QT_INST_PATCH_VERSION		,patch number of the installed Qt (e.g. Qt-Version = 4.2.6 => 6)
#

# compatibility to CMakeList.txt files for Qt3 projects
IF(NOT QT_MAX_VERSION)
	SET(QT_MAX_VERSION "3.9.9")
ENDIF(NOT QT_MAX_VERSION)

IF(NOT QT_MIN_VERSION)
	SET(QT_MIN_VERSION "0.0.1")
ENDIF(NOT QT_MIN_VERSION)

#######################################
#
#	search for qglobal.h
#
#######################################
# Qt4-like search paths
FIND_FILE( QT4_QGLOBAL_H_FILE qglobal.h
	$ENV{QTDIR}/include/Qt
	/usr/local/qt/include/Qt
	/usr/local/include/Qt
	/usr/lib/qt/include/Qt
	/usr/include/Qt
	/usr/share/qt4/include/Qt
	C:/Progra~1/qt/include/Qt )

IF(QT4_QGLOBAL_H_FILE)
	STRING(REGEX REPLACE "/include/Qt/qglobal.h" "" QT_DIR "${QT4_QGLOBAL_H_FILE}")
	SET(QT_QGLOBAL_H_FILE ${QT4_QGLOBAL_H_FILE})
ELSE(QT4_QGLOBAL_H_FILE)
	#Qt3-like search paths
	FIND_FILE( QT3_QGLOBAL_H_FILE qglobal.h
		/usr/include/qt4/Qt
		$ENV{QTDIR}/include
		/usr/local/qt/include
		/usr/local/include
		/usr/lib/qt/include
		/usr/include
		/usr/share/qt4/include
		C:/Progra~1/qt/include
		/usr/include/qt4 )
	IF(QT3_QGLOBAL_H_FILE)
		STRING(REGEX REPLACE "/include/qglobal.h" "" QT_DIR "${QT3_QGLOBAL_H_FILE}")
		SET(QT_QGLOBAL_H_FILE ${QT3_QGLOBAL_H_FILE})
	ENDIF(QT3_QGLOBAL_H_FILE)
ENDIF(QT4_QGLOBAL_H_FILE)

#check if qglobal.h is just a file with includes qglobal.h from elsewhere
FILE(READ ${QT_QGLOBAL_H_FILE} QT_QGLOBAL_H)
#BUG!!! the regexpression is not correct. 
#If "#include" and "qglobal.h" are in different lines it would be seen as ok
STRING(REGEX MATCH "#include.*qglobal.h" QT_QGLOBAL_H_LINK "${QT_QGLOBAL_H}")

IF( QT_QGLOBAL_H_LINK )
	STRING(REGEX REPLACE ".*\"" "" QT_QGLOBAL_H_LINK "${QT_QGLOBAL_H_LINK}")
	STRING(REGEX REPLACE "\\.\\./\\.\\." "${QT_DIR}" QT_QGLOBAL_H_FILE "${QT_QGLOBAL_H_LINK}")
ENDIF(QT_QGLOBAL_H_LINK)


#######################################################
#
#	read the version number of the installed of Qt
#
#######################################################
IF( QT_QGLOBAL_H_FILE )
	#extract the version string from qglobal.h
	FILE(READ ${QT_QGLOBAL_H_FILE} QT_QGLOBAL_H)

	# BUG !!! ... THE NEXT LINE DOES NOT WORK FOR Qt10 (even though thatĀ?s in far future) 
	# Trolltech defines in src/corelib/global/qglobal.h: QT_VERSION is (major << 16) + (minor << 8) + patch.
	
	STRING(REGEX MATCH "#define[\t ]+QT_VERSION_STR[\t ]+\"([0-9]+.[0-9]+.[0-9]+)" QT_QGLOBAL_H "${QT_QGLOBAL_H}")
	STRING(REGEX REPLACE ".*\"([0-9]+.[0-9]+.[0-9]+).*" "\\1" QT_QGLOBAL_H "${QT_QGLOBAL_H}")

	# Under windows the qt library (MSVC) has the format qt-mtXYZ where XYZ is the
	# version X.Y.Z, so we need to remove the dots from version (at least in Qt3)
	STRING(REGEX REPLACE "\\." "" qt_version_str "${QT_QGLOBAL_H}")

	STRING(REGEX REPLACE "([0-9]+)[0-9]+[0-9]+" "\\1" QT_INST_MAJOR_VERSION "${qt_version_str}")
	STRING(REGEX REPLACE "[0-9]+([0-9]+)[0-9]+" "\\1" QT_INST_MINOR_VERSION "${qt_version_str}")
	STRING(REGEX REPLACE "[0-9]+[0-9]+([0-9]+)" "\\1" QT_INST_PATCH_VERSION "${qt_version_str}")	

	# set qt_version_str back to x.y.z to make message outputs readable
	SET(qt_version_str "${QT_INST_MAJOR_VERSION}.${QT_INST_MINOR_VERSION}.${QT_INST_PATCH_VERSION}")
ELSE( QT_QGLOBAL_H_FILE )
	MESSAGE( FATAL_ERROR "CouldnĀ?t find qglobal.h => Qt not installed.")
ENDIF( QT_QGLOBAL_H_FILE )
MESSAGE(STATUS "Found Qt-Version ${QT_INST_MAJOR_VERSION}.${QT_INST_MINOR_VERSION}.${QT_INST_PATCH_VERSION}")


#############################################################
#
#	check the minimum requirments set in QT_MIN_VERSION
#
#############################################################
IF (QT_MIN_VERSION)
	#now parse the parts of the user given version string into variables 
	STRING(REGEX MATCH "^[0-9]+\\.[0-9]+\\.[0-9]+$" min_qt_major_vers "${QT_MIN_VERSION}")
	IF (NOT min_qt_major_vers)
		MESSAGE( FATAL_ERROR "Invalid Qt version string given: \"${QT_MIN_VERSION}\", expected e.g. \"3.1.5\"")
	ENDIF (NOT min_qt_major_vers)
	
	STRING(REGEX REPLACE "([0-9]+)\\.[0-9]+\\.[0-9]+" "\\1" min_qt_major_vers "${QT_MIN_VERSION}")
	STRING(REGEX REPLACE "[0-9]+\\.([0-9])+\\.[0-9]+" "\\1" min_qt_minor_vers "${QT_MIN_VERSION}")
	STRING(REGEX REPLACE "[0-9]+\\.[0-9]+\\.([0-9]+)" "\\1" min_qt_patch_vers "${QT_MIN_VERSION}")
  # min = "6.5.4", qt = "3.2.1"
 
  # check major number
  IF (min_qt_major_vers GREATER QT_INST_MAJOR_VERSION)                  # (6 > 3) ?
    MESSAGE(  FATAL_ERROR "Qt major version too small (minimum: ${QT_MIN_VERSION}, found: ${qt_version_str})")            # yes
  ELSE  (min_qt_major_vers GREATER QT_INST_MAJOR_VERSION)               # no
    IF (min_qt_major_vers LESS QT_INST_MAJOR_VERSION)                  # (6 < 3) ?
      SET( QT_VERSION_BIG_ENOUGH "YES" )                      # yes
    ELSE (min_qt_major_vers LESS QT_INST_MAJOR_VERSION)                # ( 6==3) ?

      # check minor number
      IF (min_qt_minor_vers GREATER QT_INST_MINOR_VERSION)            # (5>2) ?
        MESSAGE(  FATAL_ERROR "Qt minor version too small (minimum: ${QT_MIN_VERSION}, found: ${qt_version_str})")      # yes
      ELSE (min_qt_minor_vers GREATER QT_INST_MINOR_VERSION)          # no
        IF (min_qt_minor_vers LESS QT_INST_MINOR_VERSION)            # (5<2) ?
          SET( QT_VERSION_BIG_ENOUGH "YES" )                # yes
        ELSE (min_qt_minor_vers LESS QT_INST_MINOR_VERSION)          # (5==2)

	  # check patch number
          IF (min_qt_patch_vers GREATER QT_INST_PATCH_VERSION)      # (4>1) ?
            MESSAGE( FATAL_ERROR "Qt patch level too small (minimum: ${QT_MIN_VERSION}, found: ${qt_version_str})")  # yes
          ELSE (min_qt_patch_vers GREATER QT_INST_PATCH_VERSION)    # (4>1) ?
            SET( QT_VERSION_BIG_ENOUGH "YES" )             # yes
          ENDIF (min_qt_patch_vers GREATER QT_INST_PATCH_VERSION)   # (4>1) ?
        ENDIF (min_qt_minor_vers LESS QT_INST_MINOR_VERSION)

      ENDIF (min_qt_minor_vers GREATER QT_INST_MINOR_VERSION)
    ENDIF (min_qt_major_vers LESS QT_INST_MAJOR_VERSION)
  ENDIF (min_qt_major_vers GREATER QT_INST_MAJOR_VERSION)
ENDIF (QT_MIN_VERSION)


#############################################################
#
#	check the maximum requirments set in QT_MAX_VERSION
#
#############################################################
IF(QT_MAX_VERSION) 
	#now parse the parts of the user given version string into variables 
	STRING(REGEX MATCH "^[0-9]+\\.[0-9]+\\.[0-9]+$" max_qt_major_vers "${QT_MAX_VERSION}")
	IF (NOT max_qt_major_vers)
		MESSAGE( FATAL_ERROR "Invalid Qt version string given: \"${QT_MAX_VERSION}\", expected e.g. \"4.1.5\"")
	ENDIF (NOT max_qt_major_vers)
  
	STRING(REGEX REPLACE "([0-9]+)\\.[0-9]+\\.[0-9]+" "\\1" max_qt_major_vers "${QT_MAX_VERSION}")
	STRING(REGEX REPLACE "[0-9]+\\.([0-9])+\\.[0-9]+" "\\1" max_qt_minor_vers "${QT_MAX_VERSION}")
	STRING(REGEX REPLACE "[0-9]+\\.[0-9]+\\.([0-9]+)" "\\1" max_qt_patch_vers "${QT_MAX_VERSION}")
  
	# max = "6.5.4", qt = "7.2.1"
 
	# check major number
	IF (max_qt_major_vers LESS QT_INST_MAJOR_VERSION)                  # (6 < 3) ?
	  MESSAGE(  FATAL_ERROR "Qt major version too big (maximum: ${QT_MAX_VERSION}, found: ${qt_version_str})") # yes
	ELSE  (max_qt_major_vers LESS QT_INST_MAJOR_VERSION)               # no
	  IF (max_qt_major_vers GREATER QT_INST_MAJOR_VERSION)                  # (6 < 3) ?
	    SET( QT_VERSION_SMALL_ENOUGH "YES" )                      # yes
	  ELSE (max_qt_major_vers GREATER QT_INST_MAJOR_VERSION)                # ( 6==3) ?

            # check minor number
	    IF (max_qt_minor_vers LESS QT_INST_MINOR_VERSION)            # (5 < 2) ?
	       MESSAGE(  FATAL_ERROR "Qt minor version too big (maximum: ${QT_MAX_VERSION}, found: ${qt_version_str})") # yes
	    ELSE (max_qt_minor_vers LESS QT_INST_MINOR_VERSION)          # no
	      IF (max_qt_minor_vers GREATER QT_INST_MINOR_VERSION)            # (5 < 2) ?
	        SET( QT_VERSION_SMALL_ENOUGH "YES" )                # yes
	      ELSE (max_qt_minor_vers GREATER QT_INST_MINOR_VERSION)          # (5==2)

	        # check patch number
	        IF (max_qt_patch_vers LESS QT_INST_PATCH_VERSION)      # (4 < 1) ?
	          MESSAGE( FATAL_ERROR "Qt patch level too big (maximum: ${QT_MAX_VERSION}, found: ${qt_version_str})")  # yes
	        ELSE (max_qt_patch_vers LESS QT_INST_PATCH_VERSION)    # (4 < 1) ?
	           SET( QT_VERSION_SMALL_ENOUGH "YES" )             # yes
	        ENDIF (max_qt_patch_vers LESS QT_INST_PATCH_VERSION)   # (4 > 1) ?

	      ENDIF (max_qt_minor_vers GREATER QT_INST_MINOR_VERSION)
	    ENDIF (max_qt_minor_vers LESS QT_INST_MINOR_VERSION)
	  ENDIF (max_qt_major_vers GREATER QT_INST_MAJOR_VERSION)
	ENDIF (max_qt_major_vers LESS QT_INST_MAJOR_VERSION)
ENDIF(QT_MAX_VERSION)


#####################################################
#
#	include the correct FindQtX.cmake file
#	(we only distinguage between major versions
#
#####################################################
IF(QT_VERSION_SMALL_ENOUGH AND QT_VERSION_BIG_ENOUGH)
	# Call package for Qt3
	IF( QT_INST_MAJOR_VERSION LESS 4)
		#BUG!!! should be FIND_PACKAGE(FindQt4.cmake) when part of CMake
		INCLUDE(${CMAKE_ROOT}/Modules/FindQt3.cmake)
	ENDIF( QT_INST_MAJOR_VERSION LESS 4)
	# Call package for Qt4
	IF( QT_INST_MAJOR_VERSION GREATER 3 )
		IF( QT_INST_MAJOR_VERSION LESS 5)
			#BUG!!! should be FIND_PACKAGE(FindQt4.cmake) when part of CMake
			INCLUDE(${CMAKE_ROOT}/Modules/FindQt4.cmake)
		ELSE( QT_INST_MAJOR_VERSION LESS 5)
			MESSAGE(FATAL_ERROR "Right now CMake supports only Qt-Versions less than 5.0.0")
		ENDIF( QT_INST_MAJOR_VERSION LESS 5)
	ENDIF( QT_INST_MAJOR_VERSION GREATER 3 )
ENDIF(QT_VERSION_SMALL_ENOUGH AND QT_VERSION_BIG_ENOUGH)