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

# Copyright 2015 Mike Fährmann
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.

"""Extract images from albums at https://imgur.com/"""

from .common import Extractor, Message
from .. import text
import os.path

info = {
    "category": "imgur",
    "extractor": "ImgurExtractor",
    "directory": ["{category}", "{album-key} - {title}"],
    "filename": "{category}_{album-key}_{num:>03}_{name}.{extension}",
    "pattern": [
        r"(?:https?://)?(?:www\.)?imgur\.com/(?:a|gallery)/([^/?&#]+)",
    ],
}

class ImgurExtractor(Extractor):

    def __init__(self, match):
        Extractor.__init__(self)
        self.album = match.group(1)

    def items(self):
        data = self.get_job_metadata()
        yield Message.Version, 1
        yield Message.Directory, data
        for num, url in enumerate(self.get_image_urls(), 1):
            name, ext = os.path.splitext(url[20:])
            data["num"] = num
            data["name"] = name
            data["extension"] = ext[1:]
            yield Message.Url, url, data

    def get_job_metadata(self):
        """Collect metadata for extractor-job"""
        page = self.request("https://imgur.com/a/" + self.album).text
        data = {
            "category": info["category"],
            "album-key": self.album,
        }
        return text.extract_all(page, (
            ('title', '<meta property="og:title" content="', '"'),
            ('date' , '"create_datetime":"', '"'),
            ('count', '"num_images":', ','),
        ), values=data)[0]

    def get_image_urls(self):
        """Yield urls of all images in this album"""
        num = 0
        while True:
            url = "https://imgur.com/a/{}/all/page/{}?scrolled".format(self.album, num)
            page = self.request(url).text
            pos = begin = text.extract(page, '<div class="posts">', '')[1]
            while True:
                url, pos = text.extract(page, '<a href="', '"', pos)
                if not url:
                    break
                yield "https:" + url
            if pos == begin:
                return
            num += 1