# VERSION: 1.5
# AUTHORS: imDMG [imdmgg@gmail.com]

# Rutor.org search engine plugin for qBittorrent

import base64
import json
import logging
import re
import sys
import time
from concurrent.futures.thread import ThreadPoolExecutor
from dataclasses import dataclass, field
from html import unescape
from pathlib import Path
from tempfile import NamedTemporaryFile
from typing import Optional, Union
from urllib.error import URLError, HTTPError
from urllib.parse import unquote
from urllib.request import build_opener, ProxyHandler

try:
    from novaprinter import prettyPrinter
except ImportError:
    sys.path.insert(0, str(Path(__file__).parent.parent.absolute()))
    from novaprinter import prettyPrinter

FILE = Path(__file__)
BASEDIR = FILE.parent.absolute()

FILENAME = FILE.name[:-3]
FILE_J, FILE_C = [BASEDIR / (FILENAME + fl) for fl in [".json", ".cookie"]]

PAGES = 100


def rng(t: int) -> range:
    return range(1, -(-t // PAGES))


RE_TORRENTS = re.compile(
    r'(?:gai|tum)"><td>(.+?)</td.+?href="/(torrent/(\d+).+?)">(.+?)</a.+?right"'
    r'>([.\d]+&nbsp;\w+)</td.+?alt="S"\s/>(.+?)</s.+?red">(.+?)</s', re.S
)
RE_RESULTS = re.compile(r"</b>\sРезультатов\sпоиска\s(\d{1,4})\s", re.S)
PATTERNS = ("%ssearch/%i/%i/000/0/%s",)

# base64 encoded image
ICON = ("AAABAAEAEBAAAAEAGABoAwAAFgAAACgAAAAQAAAAIAAAAAEAGAAAAAAAAAAAAAAAAAAAAA"
        "AAAAAAAAAAAAAAAc4AAMwHNdcQ4vsN3fYS2fUY3fUe3fMj4fkk4fco4PYo5fgk7f5gp8Zu"
        "ZZtsa59FIXZEGm4kh74PyeoLGp8NHK4PHrwQHr8VIb8XJL4bJrUcKJ8optEdtPMBGcQAIc"
        "XeZAPVYwdA3MQFf8EDAJoFAMEEAM0AANIAAM4AAM0EAL8CAI8bXaEV1/cBHMsGDNTVWAOo"
        "dTIU5/ELuOAJM6sEALsIAMoEALkCBbgFALUGAKshgMcvpNUTzOoFQNIFANqxQgBpkmgKue"
        "8IT8UUy+8HO7MHPb8Gt+IG3vQHm9YKi84X4foKI7kRl+AWiMwSDYyxjXZAy84HdNYEALcP"
        "guYM+vsL6PgGl/wBWN4K1/EF//8LbdQEALgEVc41zMp0YC+t0N0XxPcCIbwGAMkGGOUGUv"
        "QKPPUEANsIU9ENvvAJw/ULnekGAr8FJcIUzfRycEZwzuMFnuYEArQCAdYDANYHAMQFAMwG"
        "PcwM2vsHU/QKPegLwvYEEckFBrsOt/Y+kYky5/YGgNAGAKkHAc4JMssSoN0GTb0L2/gHYP"
        "kCAPkFKOMP0fIHGc0EAKwLgNAq3OMd/P0Al9ACBqQCAMALbOMG+/8E8v0KjugBAO4CAPAG"
        "Q9MNyPYEB8QBAKQCe8cW9//T+/09+/8Aqd8GIbIFAMAKbuUG6f8Ht/IFFeEAAMYPqeYMhO"
        "EGB6oCgtUY5fuG0tv//vzs+PlQ9fwAw+4CLLoIALgJR+EFU+wEFcweZNAkquMFMrkArOor"
        "4fSrxsvWx8n5/fv5+fn3+/iC8fsLzPIAUscEALMDAL8QPtAsetUFWsUHue1r7/vc6evOzM"
        "fFx8n5/fvy+fj89vb/9/e+9/o44/oNi9kBD54CFKQJg9Qu4vu09vr/+ff89fTIz8rFx8n5"
        "/fvy+fj59vb49vf/+fbh+vtk6vw1rN03suFn6vnl/f3/+fn49vj18/TIz8rFx8n5/fvy+f"
        "j59vb39vf39/f//P3w+fme6/ak8Prv+fj//f369/r39vj18/TIz8rFx8ngBwAA4AMAAMAD"
        "AADAAwAAwAMAAMABAACAAQAAgAEAAAAAAAAAAAAAgAEAAMADAADgBwAA+B8AAPw/AAD"
        "+fwAA")

# setup logging
logging.basicConfig(
    format="%(asctime)s %(name)-12s %(levelname)-8s %(message)s",
    datefmt="%m-%d %H:%M",
    level=logging.DEBUG
)

logger = logging.getLogger(__name__)


@dataclass
class Config:
    # username: str = "USERNAME"
    # password: str = "PASSWORD"
    torrent_date: bool = True
    # magnet: bool = False
    proxy: bool = False
    # dynamic_proxy: bool = True
    proxies: dict = field(default_factory=lambda: {"http": "", "https": ""})
    ua: str = ("Mozilla/5.0 (X11; Linux i686; rv:38.0) Gecko/20100101 "
               "Firefox/38.0 ")

    def __post_init__(self):
        try:
            if not self._validate_json(json.loads(FILE_J.read_text())):
                raise ValueError("Incorrect json scheme.")
        except Exception as e:
            logger.error(e)
            FILE_J.write_text(self.to_str())
            (BASEDIR / f"{FILENAME}.ico").write_bytes(base64.b64decode(ICON))

    def to_str(self) -> str:
        return json.dumps(self.to_dict(), indent=4, sort_keys=False)

    def to_dict(self) -> dict:
        return {self._to_camel(k): v for k, v in self.__dict__.items()}

    def _validate_json(self, obj: dict) -> bool:
        is_valid = True
        for k, v in self.__dict__.items():
            _val = obj.get(self._to_camel(k))
            if type(_val) is not type(v):
                is_valid = False
                continue
            if type(_val) is dict:
                for dk, dv in v.items():
                    if type(_val.get(dk)) is not type(dv):
                        _val[dk] = dv
                        is_valid = False
            setattr(self, k, _val)
        return is_valid

    @staticmethod
    def _to_camel(s: str) -> str:
        return "".join(x.title() if i else x
                       for i, x in enumerate(s.split("_")))


config = Config()


class Rutor:
    name = "Rutor"
    url = "http://rutor.info/"
    url_dl = url.replace("//", "//d.") + "download/"
    supported_categories = {"all": 0,
                            "movies": 1,
                            "tv": 6,
                            "music": 2,
                            "games": 8,
                            "anime": 10,
                            "software": 9,
                            "pictures": 3,
                            "books": 11}

    # error message
    error: Optional[str] = None
    # establish connection
    session = build_opener()

    def __init__(self):
        # add proxy handler if needed
        if config.proxy:
            if any(config.proxies.values()):
                self.session.add_handler(ProxyHandler(config.proxies))
                logger.debug("Proxy is set!")
            else:
                self.error = "Proxy enabled, but not set!"

        # change user-agent
        self.session.addheaders = [("User-Agent", config.ua)]

    def search(self, what: str, cat: str = "all") -> None:
        if self.error:
            self.pretty_error(what)
            return None
        query = PATTERNS[0] % (self.url, 0, self.supported_categories[cat],
                               what.replace(" ", "+"))

        # make first request (maybe it enough)
        t0, total = time.time(), self.searching(query, True)
        if self.error:
            self.pretty_error(what)
            return None
        # do async requests
        if total > PAGES:
            query = query.replace("h/0", "h/{}")
            qrs = [query.format(x) for x in rng(total)]
            with ThreadPoolExecutor(len(qrs)) as executor:
                executor.map(self.searching, qrs, timeout=30)

        logger.debug(f"--- {time.time() - t0} seconds ---")
        logger.info(f"Found torrents: {total}")

    def download_torrent(self, url: str) -> None:
        # Download url
        response = self._request(url)
        if self.error:
            self.pretty_error(url)
            return None

        # Create a torrent file
        with NamedTemporaryFile(suffix=".torrent", delete=False) as fd:
            fd.write(response)

            # return file path
            logger.debug(fd.name + " " + url)
            print(fd.name + " " + url)

    def searching(self, query: str, first: bool = False) -> Union[None, int]:
        response = self._request(query)
        if self.error:
            return None
        page, torrents_found = response.decode(), -1
        if first:
            # firstly we check if there is a result
            result = RE_RESULTS.search(page)
            if not result:
                self.error = "Unexpected page content"
                return None
            torrents_found = int(result[1])
            if not torrents_found:
                return 0
        self.draw(page)

        return torrents_found

    def draw(self, html: str) -> None:
        for tor in RE_TORRENTS.findall(html):
            torrent_date = ""
            if config.torrent_date:
                # replace names month
                months = ("Янв", "Фев", "Мар", "Апр", "Май", "Июн",
                          "Июл", "Авг", "Сен", "Окт", "Ноя", "Дек")
                ct = [unescape(tor[0].replace(m, f"{i:02d}"))
                      for i, m in enumerate(months, 1) if m in tor[0]][0]
                ct = time.strftime("%y.%m.%d", time.strptime(ct, "%d %m %y"))
                torrent_date = f"[{ct}] "

            prettyPrinter({
                "engine_url": self.url,
                "desc_link": self.url + tor[1],
                "name": torrent_date + unescape(tor[3]),
                "link": self.url_dl + tor[2],
                "size": unescape(tor[4]),
                "seeds": unescape(tor[5]),
                "leech": unescape(tor[6])
            })

    def _request(
            self, url: str, data: Optional[bytes] = None, repeated: bool = False
    ) -> Union[bytes, None]:
        try:
            with self.session.open(url, data, 5) as r:
                # checking that tracker isn't blocked
                if r.geturl().startswith((self.url, self.url_dl)):
                    return r.read()
                self.error = f"{url} is blocked. Try another proxy."
        except (URLError, HTTPError) as err:
            logger.error(err.reason)
            error = str(err.reason)
            if "timed out" in error and not repeated:
                logger.debug("Repeating request...")
                return self._request(url, data, True)
            if "no host given" in error:
                self.error = "Proxy is bad, try another!"
            elif hasattr(err, "code"):
                self.error = f"Request to {url} failed with status: {err.code}"
            else:
                self.error = f"{url} is not response! Maybe it is blocked."

        return None

    def pretty_error(self, what: str) -> None:
        prettyPrinter({"engine_url": self.url,
                       "desc_link": "https://github.com/imDMG/qBt_SE",
                       "name": f"[{unquote(what)}][Error]: {self.error}",
                       "link": self.url + "error",
                       "size": "1 TB",  # lol
                       "seeds": 100,
                       "leech": 100})

        self.error = None


# pep8
rutor = Rutor

if __name__ == "__main__":
    if BASEDIR.parent.joinpath("settings_gui.py").exists():
        from settings_gui import EngineSettingsGUI

        EngineSettingsGUI(FILENAME)
    engine = rutor()
    engine.search("doctor")