import json
import os
import urllib.request

from bs4 import BeautifulSoup

from bulkredditdownloader.downloaders.base_downloader import BaseDownloader
from bulkredditdownloader.downloaders.gif_delivery_network import GifDeliveryNetwork
from bulkredditdownloader.errors import NotADownloadableLinkError
from bulkredditdownloader.utils import GLOBAL
import pathlib


class Gfycat(BaseDownloader):
    def __init__(self, directory: pathlib.Path, post: dict):
        super().__init__(directory, post)
        try:
            post['MEDIAURL'] = self.getLink(post['CONTENTURL'])
        except IndexError:
            raise NotADownloadableLinkError("Could not read the page source")

        post['EXTENSION'] = self.getExtension(post['MEDIAURL'])

        if not os.path.exists(directory):
            os.makedirs(directory)

        filename = GLOBAL.config['filename'].format(**post) + post["EXTENSION"]
        short_filename = post['POSTID'] + post['EXTENSION']

        self.getFile(filename, short_filename, directory, post['MEDIAURL'])

    @staticmethod
    def getLink(url: str) -> str:
        """Extract direct link to the video from page's source
        and return it
        """
        if '.webm' in url or '.mp4' in url or '.gif' in url:
            return url

        if url[-1:] == '/':
            url = url[:-1]

        url = "https://gfycat.com/" + url.split('/')[-1]

        page_source = (urllib.request.urlopen(url).read().decode())

        soup = BeautifulSoup(page_source, "html.parser")
        attributes = {"data-react-helmet": "true", "type": "application/ld+json"}
        content = soup.find("script", attrs=attributes)

        if content is None:
            return GifDeliveryNetwork.getLink(url)

        return json.loads(content.contents[0])["video"]["contentUrl"]