# -*- coding: utf-8 -*-

# Copyright(C) 2010-2011 Noé Rubinstein
#
# This file is part of weboob.
#
# weboob is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# weboob 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with weboob. If not, see <http://www.gnu.org/licenses/>.

from __future__ import with_statement

import re

from weboob.capabilities.gallery import ICapGallery, BaseGallery, BaseImage
from weboob.tools.backend import BaseBackend
from weboob.tools.browser import BaseBrowser, BasePage

__all__ = ['GenericComicReaderBackend']


class DisplayPage(BasePage):
    def get_page(self, gallery):
        src = self.document.xpath(self.browser.params['img_src_xpath'])[0]

        return BaseImage(src,
                gallery=gallery,
                url=src)

    def page_list(self):
        return self.document.xpath(self.browser.params['page_list_xpath'])


class GenericComicReaderBrowser(BaseBrowser):
    def __init__(self, browser_params, *args, **kwargs):
        self.params = browser_params
        BaseBrowser.__init__(self, *args, **kwargs)

    def iter_gallery_images(self, gallery):
        self.location(gallery.url)
        assert self.is_on_page(DisplayPage)

        for p in self.page.page_list():
            if 'page_to_location' in self.params:
                self.location(self.params['page_to_location'] % p)
            else:
                self.location(p)

            assert self.is_on_page(DisplayPage)
            yield self.page.get_page(gallery)

    def fill_image(self, image, fields):
        if 'data' in fields:
            image.data = self.readurl(image.url)


class GenericComicReaderBackend(BaseBackend, ICapGallery):
    NAME = 'genericcomicreader'
    MAINTAINER = u'Noé Rubinstein'
    EMAIL = 'noe.rubinstein@gmail.com'
    VERSION = '0.f'
    DESCRIPTION = 'Generic comic reader backend; subclasses implement specific sites'
    LICENSE = 'AGPLv3+'
    BROWSER = GenericComicReaderBrowser

    BROWSER_PARAMS = {}
    ID_REGEXP = None
    URL_REGEXP = None
    ID_TO_URL = None
    PAGES = {}

    def create_default_browser(self):
        b = self.create_browser(self.BROWSER_PARAMS)
        b.PAGES = self.PAGES
        try:
            b.DOMAIN = self.DOMAIN
        except AttributeError:
            pass
        return b

    def iter_gallery_images(self, gallery):
        with self.browser:
            return self.browser.iter_gallery_images(gallery)

    def get_gallery(self, _id):
        match = re.match(r'^%s$' % self.URL_REGEXP, _id)
        if match:
            _id = match.group(1)
        else:
            match = re.match(r'^%s$' % self.ID_REGEXP, _id)
            if match:
                _id = match.group(0)
            else:
                return None

        gallery = BaseGallery(_id, url=(self.ID_TO_URL % _id))
        with self.browser:
            return gallery

    def fill_gallery(self, gallery, fields):
        gallery.title = gallery.id

    def fill_image(self, image, fields):
        with self.browser:
            self.browser.fill_image(image, fields)

    OBJECTS = {
            BaseGallery: fill_gallery,
            BaseImage: fill_image}
