#!/usr/bin/env python2
# -*- coding: utf-8 -*-

# Copyright (C) 2011-2014 WikiTeam
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import argparse
import os
import re
import sys
import time
import urllib


def main():
    parser = argparse.ArgumentParser(
        description='Downloader of Wikimedia dumps')
    #parser.add_argument('-f', '--families', help='Choose which family projects to download (e.g. all, wikipedia, wikibooks, wikinews, wikiquote, wikisource, wikivoyage, wiktionary)', required=False)
    parser.add_argument(
        '-r', '--maxretries', help='Max retries to download a dump when md5sum doesn\'t fit. Default: 3', required=False)
    parser.add_argument(
        '-s', '--start', help='Start to download from this project (e.g.: eswiki, itwikisource, etc)', required=False)
    args = parser.parse_args()

    maxretries = 3
    if args.maxretries and int(args.maxretries) >= 0:
        maxretries = int(args.maxretries)

    dumpsdomain = 'http://dumps.wikimedia.org'
    f = urllib.urlopen('%s/backup-index.html' % (dumpsdomain))
    raw = f.read()
    f.close()

    m = re.compile(
        r'<a href="(?P<project>[^>]+)/(?P<date>\d+)">[^<]+</a>: <span class=\'done\'>Dump complete</span>').finditer(raw)
    projects = []
    for i in m:
        projects.append([i.group('project'), i.group('date')])
    projects.reverse()  # download oldest dumps first
    #projects = [['enwiki', '20130805']]

    start = args.start
    for project, date in projects:
        if start:
            if start != project:
                print 'Skipping %s, %s' % (project, date)
                continue
            else:
                start = ''  # reset

        print '-' * 50, '\n', 'Checking', project, date, '\n', '-' * 50
        time.sleep(1)  # ctrl-c
        f = urllib.urlopen('%s/%s/%s/' % (dumpsdomain, project, date))
        htmlproj = f.read()
        # print htmlproj
        f.close()

        for dumpclass in ['pages-meta-history\d*\.xml[^\.]*\.7z']:
            corrupted = True
            maxretries2 = maxretries
            while corrupted and maxretries2 > 0:
                maxretries2 -= 1
                m = re.compile(r'<a href="(?P<urldump>/%s/%s/%s-%s-%s)">' %
                               (project, date, project, date, dumpclass)).finditer(htmlproj)
                urldumps = []
                # enwiki is splitted in several files, thats why we need a loop
                # here
                for i in m:
                    urldumps.append(
                        '%s/%s' % (dumpsdomain, i.group('urldump')))

                # print urldumps
                for urldump in urldumps:
                    dumpfilename = urldump.split('/')[-1]
                    path = '%s/%s' % (dumpfilename[0], project)
                    if not os.path.exists(path):
                        os.makedirs(path)
                    os.system('wget -c %s -O %s/%s' %
                              (urldump, path, dumpfilename))

                    # md5check
                    os.system('md5sum %s/%s > md5' % (path, dumpfilename))
                    f = open('md5', 'r')
                    raw = f.read()
                    f.close()
                    md51 = re.findall(
                        r'(?P<md5>[a-f0-9]{32})\s+%s/%s' % (path, dumpfilename), raw)[0]
                    print md51

                    f = urllib.urlopen(
                        '%s/%s/%s/%s-%s-md5sums.txt' % (dumpsdomain, project, date, project, date))
                    raw = f.read()
                    f.close()
                    f = open('%s/%s-%s-md5sums.txt' %
                             (path, project, date), 'w')
                    f.write(raw)
                    f.close()
                    md52 = re.findall(
                        r'(?P<md5>[a-f0-9]{32})\s+%s' % (dumpfilename), raw)[0]
                    print md52

                    if md51 == md52:
                        print 'md5sum is correct for this file, horay! \o/'
                        print '\n' * 3
                        corrupted = False
                    else:
                        os.remove('%s/%s' % (path, dumpfilename))

if __name__ == '__main__':
    main()