# -*- 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 division
from __future__ import absolute_import
import glob
import os
import shutil
import stat


class CopyDirectory:
    def __init__(self, source, destination, pattern="*", directorypattern="*", overwriteolder=0,
                 copyfile=shutil.copyfile, copy_file_mode=False, rewrite_plugin_conf=False):
        """
        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
        self.copy_file_mode = copy_file_mode  # specify if permissions for files (files only, not directories) should be copied
        self.rewrite_plugin_conf = rewrite_plugin_conf

    def process(self):
        print("Gathering file list for {}".format(self.destinationdirectory))
        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)
        print("Copy/update files...")
        for source, destination in self.filelist:
            # following is an argument to the constructor
            try:
                filepath = os.path.dirname(destination)
                if not os.path.exists(filepath):
                    os.makedirs(filepath)
                self.copyfile(source, destination)
                if self.copy_file_mode:
                    shutil.copymode(source, destination)
            except Exception as e:
                print("Warning! Can not update fle: {}".format(destination))
                print(e)

    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 source.endswith('plugin.conf') and os.path.exists(destination) and \
                    not self.rewrite_plugin_conf:
                continue
            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