# encoding: utf-8
"""
The ``yade.libVersions`` module tracks versions of all libraries it was compiled with. Example usage is as follows::

	from yade.libVersions import *
	if(getVersion('cgal') > (4,9,0)):
		…
	else:
		…

To obtain a list of all libraries use the function :yref:`yade.libVersions.printAllVersions`.

All libraries listed in :ref:`prerequisites<prerequisites>` are detected by this module.

.. note:: If we need a version of some library not listed in :ref:`prerequisites<prerequisites>`, then it must also be added to :ysrc:`that list<doc/sphinx/installation.rst>`.

When adding a new version please have a look at these three files: 

1. :ysrc:`py/_libVersions.cpp`: detection of versions from ``#include`` files by C++.
2. :ysrc:`py/libVersions.py.in`: python module which is constructed by cmake during compilation. All ``*.in`` files are processed by cmake.
3. :ysrc:`cMake/FindMissingVersions.cmake`: forced detection of library with undetectable version.

.. hint:: The safest way to compare versions is to use builtin python tuple comparison e.g. ``if(cgalVer > (4,9,0) and cgalVer < (5,1,1)):``.
"""

# all C++ functions are accessible now:
from yade._libVersions import *
import yade.config

def getArchitecture():
	"""
	:return: string containing processor architecture name, as reported by ``uname -m`` call or from ``CMAKE_HOST_SYSTEM_PROCESSOR`` cmake variable.
	"""
	return '${ARCHITECTURE}'

def getLinuxVersion():
	"""
	:return: string containing linux release and version, preferably the value of ``PRETTY_NAME`` from file ``/etc/os-release``.
	"""
	ret=""
	try:
		import os
		listDir = os.listdir("/etc")
		once = ("os-release" in listDir)
		for f in listDir:
			if((once and f=="os-release") or ((not once) and f.endswith("elease"))):
				with open(os.path.join("/etc", f), 'r') as fin:
					lines=""
					for line in fin:
						if(line.startswith("PRETTY_NAME")):
							try:
								ret=(line.split('"')[1])
							except Exception as e:
								ret=(line)
							break
						lines+=line
					if(ret==""): ret=("\n"+lines)
	except Exception as e:
		print("Error: cannot find file /etc/os-release. Caught exception:",e)
	if(ret==""): ret="Unknown"
	return ret


def getVersion(libName):
	"""
	This function returns the tuple ``(major, minor, patchlevel)`` with library version number. The ``yade --test`` in file :ysrc:`py/tests/libVersions.py` tests that this
	version is the same as detected by cmake and C++. If only one of those could detect the library version, then this number is used.

	:param string libName: the name of the library

	:return: tuple in format ``(major, minor, patchlevel)`` if ``libName`` exists. Otherwise it returns ``None``.

	.. note:: library openblas has no properly defined version in header files, this function will return ``(0,0,0)`` for openblas. Parsing the version string would be unreliable. The mpi version detected by cmake sometimes is different than version detected by C++, this needs further investigation.
	"""
	cppVer   = getAllVersionsCpp()
	cmakeVer = getAllVersionsCmake()
	if(libName == 'openblas'):
		print("Warning: openblas has no properly defined version in header files, the obtained version is ",cppVer[libName])
	if((libName == 'mpi' ) and (cppVer[libName][0] != cmakeVer[libName][0])):
		print('\033[91m'+" Warning: mpi versions are different. Can you help with file py/libVersions.py.in?"+'\033[0m')
		print("C++ is: " , cppVer[libName], " and cmake is: ",cmakeVer[libName], ", will return the C++ one.")
	if((libName in cppVer) and (len(cppVer[libName])==2)):
		return cppVer[libName][0]
	if((libName in cmakeVer) and (len(cmakeVer[libName])==2)):
		return cmakeVer[libName][0]
	#raise RuntimeError("Could not find library version of ",libName)
	return None

def getAllVersionsCmake():
	"""
	This function returns library versions as provided by cmake during compilation.

	:return: dictionary in following format: ``{ "libName" : [ (major, minor, patchlevel) , "versionString" ] }``


	As an example the dict below reflects what libraries this documentation was compiled with (here are only those detected by `CMAKE <https://cmake.org>`_):

	.. ipython::
	
	   In [1]: from yade.libVersions import *

	   In [1]: getAllVersionsCmake()

	.. note:: Please add here detection of other libraries when yade starts using them or if you discover how to extract from cmake a version which I didn't add here.

	"""

	ret={}
	def addVer(name,v1,v2,v3,ver):
		try:
			ret.update({ name : [ ( int(v1) , int(v2) , int(v3) ) , ver ]})
		except:
			pass
	# 0.cmake
	addVer("cmake",'${CMAKE_MAJOR_VERSION}','${CMAKE_MINOR_VERSION}','${CMAKE_PATCH_VERSION}','${CMAKE_VERSION}')
	# 1. compiler
	try:
		addVer('compiler'  ,'${CMAKE_CXX_COMPILER_VERSION}'.split('.')[0],'${CMAKE_CXX_COMPILER_VERSION}'.split('.')[1],'${CMAKE_CXX_COMPILER_VERSION}'.split('.')[2],'${CMAKE_CXX_COMPILER} ${CMAKE_CXX_COMPILER_VERSION}')
	except:
		pass
	addVer("clang",'${CLANG_VERSION_MAJOR}','${CLANG_VERSION_MINOR}','${CLANG_VERSION_PATCHLEVEL}','${CLANG_VERSION}')
	# 2. boost
	addVer("boost",'${Boost_MAJOR_VERSION}','${Boost_MINOR_VERSION}','${Boost_SUBMINOR_VERSION}','${Boost_VERSION}')
	# 3. qt
	addVer("qt"   ,'${Used_QT_VERSION_MAJOR}','${Used_QT_VERSION_MINOR}','${Used_QT_VERSION_PATCH}','${Used_QT_VERSION_MAJOR}.${Used_QT_VERSION_MINOR}.${Used_QT_VERSION_PATCH}')
	# 4. freeglut
	addVer("freeglut" ,'${FREEGLUT_VERSION_MAJOR}','${FREEGLUT_VERSION_MINOR}','${FREEGLUT_VERSION_PATCH}','${FREEGLUT_VERSION_STR}')
	try:
		glutVerStr='${GLUT_VERSION}'
		glutVerNum=glutVerStr.split('.')
		addVer("glut", glutVerNum[0] , glutVerNum[1] , glutVerNum[2] , glutVerStr )
	except:
		pass
	# 5. qglviewer  - I don't know how to detect it
	# 6. python
	addVer("python",'${PYTHON_VERSION_MAJOR}','${PYTHON_VERSION_MINOR}','${PYTHON_VERSION_PATCH}','${PYTHON_VERSION_STRING}')
	# 7. matplotlib
	addVer("matplotlib" ,'${MATPLOTLIB_VERSION_MAJOR}','${MATPLOTLIB_VERSION_MINOR}','${MATPLOTLIB_VERSION_PATCH}', '${MATPLOTLIB_VERSION}')
	# 8. eigen
	addVer("eigen" ,'${EIGEN3_WORLD_VERSION}','${EIGEN3_MAJOR_VERSION}','${EIGEN3_MINOR_VERSION}','${EIGEN3_VERSION}')
	# 9. gdb        - I don't know how to detect it
	# 10. sqlite3   - I don't know how to detect it
	# 11. loki      - I don't know how to detect it
	# 12. vtk
	addVer("vtk"   ,'${VTK_MAJOR_VERSION}','${VTK_MINOR_VERSION}','${VTK_BUILD_VERSION}','${VTK_VERSION}')
	# 13. cgal
	addVer("cgal"  ,'${CGAL_MAJOR_VERSION}','${CGAL_MINOR_VERSION}','${CGAL_BUGFIX_VERSION}','${CGAL_VERSION}')
	# 14. suitesparse
	addVer("suitesparse",'${SUITESPARSE_MAIN_VERSION}','${SUITESPARSE_SUB_VERSION}','${SUITESPARSE_SUBSUB_VERSION}','${SUITESPARSE_VERSION}')
	# 15. openblas  - I don't know how to detect it
	# 16. metis     - I don't know how to detect it
	# 17. mpi       - This one is based on https://cmake.org/cmake/help/v3.10/module/FindMPI.html
	addVer("mpi"   ,'${MPI_CXX_VERSION_MAJOR}','${MPI_CXX_VERSION_MINOR}','0', '${MPI_CXX_VERSION}')
	# 18. numpy
	addVer("numpy" ,'${NUMPY_VERSION_MAJOR}','${NUMPY_VERSION_MINOR}','${NUMPY_VERSION_PATCH}', '${NUMPY_VERSION}')
	# Note: these below are getting the version currently installed, not the one with which yade was compiled. Maybe this will need to be changed.
	# 19. ipython
	addVer("ipython" ,'${IPYTHON_VERSION_MAJOR}','${IPYTHON_VERSION_MINOR}','${IPYTHON_VERSION_PATCH}', '${IPYTHON_VERSION}')
	# 20. sphinx,
	addVer("sphinx" ,'${SPHINX_VERSION_MAJOR}','${SPHINX_VERSION_MINOR}','${SPHINX_VERSION_PATCH}', '${SPHINX_VERSION}')
	# 21. clp
	# Note: this can be fixed in the same way as forced detection of freeglut, with file cMake/FindMissingVersions.cmake
	addVer("clp",'${CLP_WORLD_VERSION}','${CLP_MAJOR_VERSION}','${CLP_MINOR_VERSION}','${CLP_VERSION}')
	addVer("coinutils",'${COINUTILS_WORLD_VERSION}','${COINUTILS_MAJOR_VERSION}','${COINUTILS_MINOR_VERSION}','${COINUTILS_VERSION}')
	# 22. PyMPI
	addVer("mpi4py" ,'${MPI4PY_VERSION_MAJOR}','${MPI4PY_VERSION_MINOR}','${MPI4PY_VERSION_PATCH}', '${MPI4PY_VERSION}')
	# 23. MPFR
	addVer("mpfr",'${MPFR_MAJOR_VERSION}','${MPFR_MINOR_VERSION}','${MPFR_PATCHLEVEL_VERSION}','${MPFR_VERSION}')
	addVer("mpc",'${MPC_MAJOR_VERSION}','${MPC_MINOR_VERSION}','${MPC_PATCHLEVEL_VERSION}','${MPC_VERSION}')
	# 24. mpmath
	# a simple check of mpmath is a following python command:
	# import mpmath ; mpmath.mp.dps=50 ; mpmath.acos(0)
	try:
		addVer("mpmath",'${MPMATH_VERSION}'.split('.')[0],'${MPMATH_VERSION}'.split('.')[1],'${MPMATH_VERSION}'.split('.')[2],'${MPMATH_VERSION}')
	except:
		pass
	# 25. tkinter
	addVer("tkinter" ,'${TKINTER_VERSION_MAJOR}','${TKINTER_VERSION_MINOR}','${TKINTER_VERSION_PATCH}', '${TKINTER_VERSION}')
	# 26. pygraphviz
	addVer("pygraphviz" ,'${PYGRAPHVIZ_VERSION_MAJOR}','${PYGRAPHVIZ_VERSION_MINOR}','${PYGRAPHVIZ_VERSION_PATCH}', '${PYGRAPHVIZ_VERSION}')
	# 27. Xlib
	addVer("Xlib" ,'${XLIB_VERSION_MAJOR}','${XLIB_VERSION_MINOR}','${XLIB_VERSION_PATCH}', '${XLIB_VERSION}')
	
	return ret

def printAllVersions(rstFormat=False):
	"""
	This function prints a nicely formatted table with library versions.

	:param bool rstFormat: whether to print table using the reStructuredText formatting. Defaults to ``False`` and prints using `Gitlab markdown rules <https://gitlab.com/help/user/markdown>`_ so that it is easy to paste into gitlab discussions.

	As an example the table below actually reflects with what libraries this documentation was compiled:

	.. ipython::
	
	   In [1]: printAllVersions()

	.. note:: For convenience at startup ``from yade.libVersions import printAllVersions`` is executed, so that this function is readily accessible.

	"""

	# there will be three columns: library , cmake , C++
	headers  = ["library","cmake","C++"]
	longest  = [None,None,None]
	cmakeVer = getAllVersionsCmake()
	cppVer   = getAllVersionsCpp()
	namesSet = set()
	for i in range(3): longest[i] = len(headers[i])
	for key,val in cmakeVer.items():
		longest[0] = max(longest[0],len(key))
		if(len(val)==2):
			namesSet.add(key)
			longest[1] = max(longest[1],len(val[1]))
	for key,val in cppVer.items():
		longest[0] = max(longest[0],len(key))
		if(len(val)==2):
			namesSet.add(key)
			longest[2] = max(longest[2],len(val[1]))

	for i in range(3): longest[i]+=2

	sep = '| '+'-'*longest[0]+' | '+'-'*longest[1]+' | '+'-'*longest[2]+' |\n'
	lines="|"
	if(rstFormat):
		sep = '+-'+'-'*longest[0]+'-+-'+'-'*longest[1]+'-+-'+'-'*longest[2]+'-+'
		lines = sep+'\n|'
	# nice python formatting guide: https://pyformat.info/
	for i in range(3):
		lines +=" "+(('{:'+str(longest[i])+'}').format(headers[i]))+" |"
	lines+='\n'
	if(rstFormat):
		lines += sep.replace('-','=')+'\n'
	else:
		lines += sep
	for libName in sorted(namesSet):
		lines+="| "+(('{:'+str(longest[0])+'}').format(libName))+" |"
		if (libName in cmakeVer) and (len(cmakeVer[libName])==2):
			lines+=" "+(('{:'+str(longest[1])+'}').format(cmakeVer[libName][1]))+" |"
		else:
			lines+=" "+(('{:'+str(longest[1])+'}').format(' '                 ))+" |"
		if (libName in cppVer) and (len(cppVer[libName])==2):
			lines+=" "+(('{:'+str(longest[2])+'}').format(cppVer[libName][1]  ))+" |"
		else:
			lines+=" "+(('{:'+str(longest[2])+'}').format(' '                 ))+" |"
		lines+='\n'
		if(rstFormat):
			lines+= sep+'\n'

	if(rstFormat==False): print("\n```")
	#print("Yade revision  : ",yade.config.revision)
	print("Yade version   : ",yade.config.version)
	#print("Yade prefix    : ",yade.config.prefix)
	#print("Yade suffix    : ",yade.config.suffix)
	feats = ""
	for f in yade.config.features: feats+=" "+f
	print("Yade features  :",feats)
	# print yade config dir relative to ${HOME}
	confD = yade.config.confDir
	try:
		import os
		confD = "~/"+os.path.relpath(yade.config.confDir,os.environ['HOME'])
	except Exception as e:
		pass
	print("Yade config dir: ",confD)
	print("Yade precision :  "+str(yade.math.getDigits2(1))+" bits, "+str(yade.math.getDigits10(1))+" decimal places, with"+("" if yade.config.highPrecisionMpmath else "out")+" mpmath, "+yade.config.highPrecisionName)
	if(len(yade.math.getRealHPCppDigits10()) > 1):
		print("Yade RealHP<…> :  "+str(yade.math.getRealHPCppDigits10())+" decimal digits in C++, "+str(yade.math.getRealHPPythonDigits10())+" decimal digits accessible from python")
	if(rstFormat==False): print("```")
	print("\nLibraries used :\n")
	print(lines)
	if(rstFormat==False): print("```")
	print("Linux version  :  "+str(getLinuxVersion()))
	print("Architecture   :  "+str(getArchitecture()))
	try:
		print("Little endian  :  "+str(yade.math.isThisSystemLittleEndian()))
	except Exception as e:
		print("Little endian  :  unknown")
	if(rstFormat==False): print("```")
	print("")

def getAllVersions(rstFormat=False):
	"""
	:return: ``str`` - this function returns the result of :yref:`printAllVersions(rstFormat)<yade.libVersions.printAllVersions>` call inside a string variable.
	"""
	import sys,io
	origStdOut = sys.stdout
	newStdOut  = io.StringIO()
	sys.stdout = newStdOut
	printAllVersions(rstFormat)
	sys.stdout = origStdOut
	return newStdOut.getvalue()

"""
GITLAB format:

| header 1 | header 2 |
| -------- | -------- |
| cell 1   | cell 2   |
| cell 3   | cell 4   |


reStructuredText format:

+----------+----------+
| header 1 | header 2 |
+==========+==========+
| cell 1   | cell 2   |
+----------+----------+
| cell 3   | cell 4   |
+----------+----------+
"""