#!/usr/bin/env python3

import logging
import re
import urllib.error
import urllib.request
from html.parser import HTMLParser
from typing import Optional

from praw.models import Submission

from bulkredditdownloader.authenticator import Authenticator
from bulkredditdownloader.errors import NotADownloadableLinkError
from bulkredditdownloader.resource import Resource
from bulkredditdownloader.site_downloaders.base_downloader import BaseDownloader

logger = logging.getLogger(__name__)


class Erome(BaseDownloader):
    def __init__(self, post: Submission):
        super().__init__(post)

    def find_resources(self, authenticator: Optional[Authenticator] = None) -> list[Resource]:
        try:
            images = self._get_links(self.post.url)
        except urllib.error.HTTPError:
            raise NotADownloadableLinkError("Not a downloadable link")

        if len(images) == 1:

            image = images[0]
            if not re.match(r'https?://.*', image):
                image = "https://" + image
            return [Resource(self.post, image)]

        else:
            out = []
            for i, image in enumerate(images):
                if not re.match(r'https?://.*', image):
                    image = "https://" + image
                    out.append(Resource(self.post, image))
            return out

    @staticmethod
    def _get_links(url: str) -> list[str]:
        content = []
        line_number = None

        # TODO: move to bs4 and requests
        class EromeParser(HTMLParser):
            tag = None

            def handle_starttag(self, tag, attrs):
                self.tag = {tag: {attr[0]: attr[1] for attr in attrs}}

        page_source = (urllib.request.urlopen(url).read().decode().split('\n'))

        """ FIND WHERE ALBUM STARTS IN ORDER NOT TO GET WRONG LINKS"""
        for i in range(len(page_source)):
            obj = EromeParser()
            obj.feed(page_source[i])
            tag = obj.tag

            if tag is not None:
                if "div" in tag:
                    if "id" in tag["div"]:
                        if tag["div"]["id"] == "album":
                            line_number = i
                            break

        for line in page_source[line_number:]:
            obj = EromeParser()
            obj.feed(line)
            tag = obj.tag
            if tag is not None:
                if "img" in tag:
                    if "class" in tag["img"]:
                        if tag["img"]["class"] == "img-front":
                            content.append(tag["img"]["src"])
                elif "source" in tag:
                    content.append(tag["source"]["src"])

        return [link for link in content if link.endswith("_480p.mp4") or not link.endswith(".mp4")]