import os
import pathlib
import urllib.request

from bs4 import BeautifulSoup

from bulkredditdownloader.downloaders.downloader_utils import getExtension, getFile
from bulkredditdownloader.errors import NotADownloadableLinkError
from bulkredditdownloader.utils import GLOBAL


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

        post['EXTENSION'] = 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']

        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.split('/')[-1] or '.mp4' in url.split('/')[-1] or '.gif' in url.split('/')[-1]:
            return url

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

        url = "https://www.gifdeliverynetwork.com/" + url.split('/')[-1]
        page_source = (urllib.request.urlopen(url).read().decode())

        soup = BeautifulSoup(page_source, "html.parser")
        attributes = {"id": "mp4Source", "type": "video/mp4"}
        content = soup.find("source", attrs=attributes)

        if content is None:
            raise NotADownloadableLinkError("Could not read the page source")

        return content["src"]