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#!/opt/cloudlinux/venv/bin/python3 -bb
# -*- coding: utf-8 -*-

# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
from __future__ import print_function
from __future__ import absolute_import
from __future__ import division
from __future__ import unicode_literals
from future import standard_library
standard_library.install_aliases()
from builtins import *
import glob
import os
import shutil
import stat


class CopyDirectory(object):
    def __init__ (self, source, destination, pattern="*", directorypattern ="*",
                    overwriteolder=0, copyfile = shutil.copyfile):
        """
        ATTENTION: values other than '*' for parameter 'directorypattern' are not supported
        """
        self.sourcedirectory = source
        self.destinationdirectory = destination
        self.pattern = pattern
        self.directorypattern = directorypattern
        self.overwriteolder = overwriteolder
        self.directorylist = []
        self.filelist = []
        self.copyfile = copyfile
    def process (self):
        print("Gathering file list")
        self.walk ()
        print("Building directory tree and copying files")
        self.go ()
    def walk (self):
        '''
        Gather the list of directories and files to copy
        '''
        for _dir, subdirs, files in os.walk(self.sourcedirectory):
            self._copydir(self, _dir, subdirs + files)
    def go (self):
        '''
        Perform the primary function of copying a directory
        given an already constructed directory and file list
        (generally created by walk)
        '''
        for directory in self.directorylist:
            # following is built in to this class
            self.copydirectory (directory)
        for source, destination in self.filelist:
            print("%s --> %s"%(source, destination))
            # following is an argument to the constructor
            self.copyfile (source, destination)
    def _copydir( self, arg, directory, files):
        '''
        Perform copying for a particular directory
        '''
        #print directory
        # collect files, use files if we have '*' pattern
        workingfiles = self._files (directory, files)
        # filter subdirectories, modifies files in-place
        self._subdirectories (directory, files)
        destinationdirectory = self._directorysetup( directory )
        # should provide option for not overwriting files
        # possibly with date checks etc.
        # For extra marks, just collect this information
        # and return a list of copies to be made,
        # so the user can review before copying.
        # Do the copying
        #print workingfiles
        for file in workingfiles:
            source = os.path.join( directory, file)
            destination = os.path.join( destinationdirectory, file)
            if self.overwriteolder and os.path.exists( destination):
                if os.stat( source )[stat.ST_MTIME] > os.stat( destination )[stat.ST_MTIME]:
                    # we don't care if it's older, or it is older (hopefully)
                    self.filelist.append( (source, destination) )
                else:
                    print("skip %s (source not newer)"%(source))
            else:
                self.filelist.append( (source, destination) )
    def _subdirectories ( self, directory, default):
        '''
        Filters the list of subdirectories which will be copied
        '''
        # following modifies which directories are copied
        # does so by modifying file list in place (see os.path.walk)
        # Note: this does not work because os.path.walk is removed in python 3
        if self.directorypattern != "*":
            # default[:] = glob.glob( os.path.join( directory, self.directorypattern) )
            raise Exception('Filtering of directories not supported')
    def _files( self, directory, default):
        '''
        create the filtered list of files
        '''
        def dirfilter( values,directory=directory):
            result = []
            for value in values:
                if not os.path.isdir( os.path.join( directory, value)):
                    result.append( value)
            return result
        # following is for local processing
        if self.pattern != "*":
            return dirfilter( glob.glob( os.path.join( directory, self.pattern) ) )
        else:
            return dirfilter( default )
    def _directorysetup (self,directory):
        '''
        Ensure that the destination directory is available
        build it if it is not
        '''
        #print "setup directory", directory
        # should make this manipulation more robust
        # currently assumes all sorts of things :(
        prefix = os.path.commonprefix( (self.sourcedirectory, directory) )
        extendeddirectory = directory[len(prefix):]
        # get rid of preceding /, so won't be interpreted as root
        if extendeddirectory and extendeddirectory [0] == os.sep:
            extendeddirectory = extendeddirectory[1:]
        destinationdirectory = os.path.join (self.destinationdirectory, extendeddirectory)
        #print "  destinationdirectory", destinationdirectory
        self.directorylist.append( destinationdirectory)
        return destinationdirectory
    def copydirectory(self, directory):
        '''
        Called after tree building,
        creates needed directories
        '''
        # create directory if not already there
        #if not os.path.exists( directory ):
        try:
            os.mkdir( directory )
            print("made directory", directory)
        except os.error:
            pass