# -*- coding: utf-8  -*-
"""
This script works similar to solve_disambiguation.py. It is supposed to fix
links that contain common spelling mistakes. This is only possible on wikis
that have a template for these misspellings.

Command line options:

   -always:XY  instead of asking the user what to do, always perform the same
               action. For example, XY can be "r0", "u" or "2". Be careful with
               this option, and check the changes made by the bot. Note that
               some choices for XY don't make sense and will result in a loop,
               e.g. "l" or "m".

    -start:XY  goes through all misspellings in the category on your wiki
               that is defined (to the bot) as the category containing
               misspelling pages, starting at XY. If the -start argument is not
               given, it starts at the beginning.

   -main       only check pages in the main namespace, not in the talk,
               wikipedia, user, etc. namespaces.
"""
__version__ = '$Id$'

# (C) Daniel Herding, 2007
#
# Distributed under the terms of the MIT license.

import pywikibot
from pywikibot import pagegenerators
import solve_disambiguation

class MisspellingRobot(solve_disambiguation.DisambiguationRobot):

    misspellingTemplate = {
        'da': None,                     # uses simple redirects
        'de': u'Falschschreibung',
        #'en': u'Template:Misspelling', # rarely used on en:
        'en': None,                     # uses simple redirects
        'hu': None,                     # uses simple redirects
        'nl': None,
        #'pt': u'Pseudo-redirect',      # replaced by another system on pt:
    }

    # Optional: if there is a category, one can use the -start
    # parameter.
    misspellingCategory = {
        'da': u'Omdirigeringer af fejlstavninger', # only contains date redirects at the moment
        'de': u'Kategorie:Wikipedia:Falschschreibung',
        'en': u'Redirects from misspellings',
        'hu': u'Átirányítások hibás névről',
        'nl': u'Categorie:Wikipedia:Redirect voor spelfout',
        #'pt': u'Categoria:!Pseudo-redirects',
    }

    msg = {
        'ar': u'روبوت: إصلاح وصلة خاطئة إلى %s',
        'da': u'Omdirigeringer af fejlstavninger',
        'de': u'Bot: korrigiere Link auf Falschschreibung: %s',
        'en': u'Robot: Fixing misspelled link to %s',
        'he': u'בוט: מתקן קישור עם שגיאה לדף %s',
        'nds': u'Bot: rut mit verkehrt schreven Lenk op %s',
        'nl': u'Bot: verkeerd gespelde verwijzing naar %s gecorrigeerd',
        'pl': u'Robot poprawia literówkę w linku do %s',
        'pt': u'Bot: Corrigindo link com erro ortográfico para %s'
    }

    def __init__(self, always, firstPageTitle, main_only):
        solve_disambiguation.DisambiguationRobot.__init__(
            self, always, [], True, False, self.createPageGenerator(firstPageTitle),
            False, main_only)

    def createPageGenerator(self, firstPageTitle):
        if pywikibot.getSite().lang in self.misspellingCategory:
            misspellingCategoryTitle = self.misspellingCategory[pywikibot.getSite().lang]
            misspellingCategory = pywikibot.Category(pywikibot.getSite(),
                                                  misspellingCategoryTitle)
            generator = pagegenerators.CategorizedPageGenerator(
                misspellingCategory, recurse = True, start=firstPageTitle)
        else:
            misspellingTemplateName = 'Template:%s' \
                                      % self.misspellingTemplate[pywikibot.getSite().lang]
            misspellingTemplate = pywikibot.Page(pywikibot.getSite(),
                                                 misspellingTemplateName)
            generator = pagegenerators.ReferringPageGenerator(
                misspellingTemplate, onlyTemplateInclusion=True)
            if firstPageTitle:
                pywikibot.output(
                    u'-start parameter unsupported on this wiki because there is no category for misspellings.')
        preloadingGen = pagegenerators.PreloadingGenerator(generator)
        return preloadingGen

    # Overrides the DisambiguationRobot method.
    def findAlternatives(self, disambPage):
        if disambPage.isRedirectPage():
            self.alternatives.append(disambPage.getRedirectTarget().title())
            return True
        elif self.misspellingTemplate[disambPage.site.lang] is not None:
            for template, params in disambPage.templatesWithParams():
                templateTitle = template.title(withNamespace=False)
                if templateTitle in self.misspellingTemplate[pywikibot.getSite().lang]:
                    # The correct spelling is in the last paramter.
                    correctSpelling = params[-1]
                    # On de.wikipedia, there are some cases where the
                    # misspelling is ambigous, see for example:
                    # http://de.wikipedia.org/wiki/Buthan
                    for match in self.linkR.finditer(correctSpelling):
                        self.alternatives.append(match.group('title'))

                    if not self.alternatives:
                        # There were no links in the parameter, so there is
                        # only one correct spelling.
                        self.alternatives.append(correctSpelling)
                    return True

    # Overrides the DisambiguationRobot method.
    def setSummaryMessage(self, disambPage, new_targets=[], unlink=False, dn=False):
        # TODO: setSummaryMessage() in solve_disambiguation now has parameters
        # new_targets and unlink. Make use of these here.
        comment = pywikibot.translate(self.mysite, self.msg) \
                  % disambPage.title()
        pywikibot.setAction(comment)

def main():
    # the option that's always selected when the bot wonders what to do with
    # a link. If it's None, the user is prompted (default behaviour).
    always = None
    main_only = False
    firstPageTitle = None

    for arg in pywikibot.handleArgs():
        if arg.startswith('-always:'):
            always = arg[8:]
        elif arg.startswith('-start'):
            if len(arg) == 6:
                firstPageTitle = pywikibot.input(
                    u'At which page do you want to start?')
            else:
                firstPageTitle = arg[7:]
        elif arg == '-main':
            main_only = True


    bot = MisspellingRobot(always, firstPageTitle, main_only)
    bot.run()

if __name__ == "__main__":
    try:
        main()
    finally:
        pywikibot.stopme()