#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import zmq
import base64
from io import StringIO
import datetime
import gzip
import argparse
import binascii
import os
import time, datetime
import re

'''
'
'   Import content/pastes into redis.
'   If content is not compressed yet, compress it (only text).
'
'   /!\ WARNING /!\
        Content to be imported can be placed in a directory tree of the form
        root/
        |
        +-- Year/
            |
            +-- Month/
                |
                +-- Day/
                    |
                    +-- Content
    e.g.:
    ~/to_import/2017/08/22/paste1.gz

    or this directory tree will be created with the current date
    e.g.:
    ~/to_import/paste1.gz
'
'''

def is_gzip_file(magic_nuber):
     return binascii.hexlify(magic_nuber) == b'1f8b'

def is_hierachy_valid(path):
    var = path.split('/')
    try:
        newDate = datetime.datetime(int(var[-4]), int(var[-3]), int(var[-2]))
        correctDate = True
    except ValueError:
        correctDate = False
    except IndexError:
        correctDate = False
    except:
        correctDate = False
    return correctDate

def sanitize_str(str_var, invalid_char_regex):
    res = re.sub(invalid_char_regex, "-", str_var)
    return res.replace(' ', '_')

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='Take files from a directory and push them into a 0MQ feed.')
    parser.add_argument('-d', '--directory', type=str, required=True, help='Root directory to import')
    parser.add_argument('-p', '--port', type=int, default=5556, help='Zero MQ port')
    parser.add_argument('-c', '--channel', type=str, default='102', help='Zero MQ channel')
    parser.add_argument('-n', '--name', type=str, default='import_dir', help='Name of the feeder')
    parser.add_argument('-s', '--seconds', type=float, default=0.2, help='Second between pastes')
    parser.add_argument('--hierarchy', type=int, default=1, help='Number of parent directory forming the name')

    args = parser.parse_args()

    context = zmq.Context()
    socket = context.socket(zmq.PUB)
    socket.bind("tcp://*:{}".format(args.port))
    time.sleep(1) #Important, avoid loosing the 1 message

    invalid_char = r'[\\/*?&%=:"<>|#\\\']'
    invalid_char_dir = r'[\\*?&%=:"<>|#\\\']'

    for dirname, dirnames, filenames in os.walk(args.directory):
        for filename in filenames:
            complete_path = os.path.join(dirname, filename)

            with open(complete_path, 'rb') as f:
                messagedata = f.read()

            #verify that the data is gzipEncoded. if not compress it
            if not is_gzip_file(messagedata[0:2]):
                messagedata = gzip.compress(messagedata)
                complete_path += '.gz'

            if complete_path[-4:] != '.gz':

                #if paste do not have a 'date hierarchy', create it
                if not is_hierachy_valid(complete_path):
                    now = datetime.datetime.now()
                    paste_name = complete_path.split('/')[-1]
                    paste_name = sanitize_str(paste_name, invalid_char)
                    directory = complete_path.split('/')[-2]
                    directory = sanitize_str(directory, invalid_char_dir)
                    wanted_path = os.path.join(directory, now.strftime("%Y"), now.strftime("%m"), now.strftime("%d"), paste_name)
                    wanted_path = os.path.relpath(wanted_path)
                else:
                    #take wanted path of the file
                    wanted_path = os.path.relpath(complete_path)
                    wanted_path = wanted_path.split('/')
                    wanted_path = '/'.join(wanted_path[-(4+args.hierarchy):])
                    wanted_path = sanitize_str(wanted_path, invalid_char_dir)

                # sanitize feeder_name
                feeder_name = os.path.relpath(sanitize_str(args.name, invalid_char))

                path_to_send = 'import_dir/' + feeder_name + '>>' + wanted_path
                s = b' '.join( [ args.channel.encode(), path_to_send.encode(), base64.b64encode(messagedata) ] )
                socket.send(s)
                print('import_dir/' + feeder_name+'>>'+wanted_path)
                time.sleep(args.seconds)

            else:
                print('{} : incorrect type'.format(complete_path))