import random
import re
from dataclasses import dataclass, field
from typing import Callable
from urllib import parse

from qutebrowser.api import interceptor
from qutebrowser.extensions.interceptors import QUrl, RedirectException
from qutebrowser.utils import message


def fixScribePath(url: QUrl):
    """Fix external medium blog to scribe translation.
    Some paths from medium will go through a 'global identity'
    path which messes up the actual url path we want to go
    to and puts it in queries. This puts it back on the path.
    """
    # double unquoting necessary!
    # I suppose we double-wrap it earlier somewhere?
    # unquoted = parse.unquote(
    #     url.path(options=QUrl.ComponentFormattingOption.FullyEncoded)
    # )
    path = parse.unquote(f"{url.path()}{url.query()}", encoding="ascii")
    url.setQuery(None)
    new_path = re.sub(r"m/global-identity-2redirectUrl=", "", path)
    url.setPath(
        parse.quote(new_path),
        mode=QUrl.ParsingMode.StrictMode,
    )
    return url


# TODO: Once implemented, delete
# type Service = dict[str, list[str]]
type Redirects = dict[str, Service]


@dataclass
class Service:
    source: list[str] = field(default_factory=lambda: [])
    target: list[str] = field(default_factory=lambda: [])
    custom_targets: bool = False
    postprocess: Callable[[], str] | None = None


# T = TypeVar("T")
# @dataclass
# class Redirects:
#     services: list[Service]
#     selector: Callable[[list[str]], str] = lambda c: c[random.randint(0, len(c) - 1)] #TODO: should implement the pick random sel algo from below
#     farside_service: str = "farside.link" # "fastsi.de" # TODO: should contain the url for the farside redirector used

redirects: Redirects = {
    "youtube": Service(source=["youtube.com"], target=["invidious"]),
    "stackoverflow": Service(
        source=["stackoverflow.com"], target=["anonymousoverflow"]
    ),
    "lbry": Service(source=["odysee.com"], target=["librarian"]),
    "reddit": Service(source=["reddit.com"], target=["redlib"]),
    "instagram": Service(source=["instagram.com"], target=["proxigram"]),
    "twitter": Service(source=["twitter.com"], target=["nitter"]),
    "imdb": Service(source=["imdb.com"], target=["libremdb"]),
    "translate": Service(source=["translate.google.com"], target=["lingva"]),
    "tiktok": Service(source=["tiktok.com"], target=["proxitok"]),
    "imgur": Service(source=["imgur.com"], target=["rimgo"]),
    "medium": Service(
        source=["medium.com"], target=["scribe"], postprocess=fixScribePath
    ),
    "fandom": Service(source=["fandom.com"], target=["breezewiki"]),
    "quora": Service(source=["quora.com"], target=["quetre"]),
    "google": Service(source=["google.com"], target=["whoogle"]),
    "twitch": Service(
        source=["twitch.com"],
        custom_targets=True,
        target=[
            "https://safetwitch.drgns.space/",
            "https://safetwitch.projectsegfau.lt/",
            "https://stream.whateveritworks.org",
            "https://safetwitch.datura.network",
            "https://ttv.vern.cc",
            "https://safetwitch.frontendfriendly.xyz/",
            "https://ttv.femboy.band",
            "https://twitch.seitan-ayoub.lol",
            "https://www.ggtyler.dev/other/frontends",
            "https://lunar.icu",
            "https://twitch.sudovanilla.org",
            "https://safetwitch.r4fo.com",
            "https://safetwitch.ducks.party",
            "https://nogafam.fr",
            "https://safetwitch.privacyredirect.com/",
            "https://st.ngn.tf/",
            "https://safetwitch.darkness.services",
            "https://4o1x5.dev/privacy-policy/",
            "https://safetwitch.adminforge.de",
        ],
    ),
    "goodreads": Service(
        source=["goodreads.com"],
        custom_targets=True,
        target=[
            "biblioreads.eu.org",
            "biblioreads.vercel.app",
            "biblioreads.mooo.com",
            "bl.vern.cc",
            "biblioreads.lunar.icu",
            "read.whateveritworks.org",
            "biblioreads.privacyfucking.rocks",
            "read.seitan-ayoub.lol",
            "read.freedit.eu",
            "biblioreads.ducks.party",
            "biblioreads.snine.nl",
            "biblioreads.privacyredirect.com",
            "reads.nezumi.party",
            "br.bloat.cat",
            "read.canine.tools",
        ],
    ),
}


def rewrite(request: interceptor.Request) -> None:
    # if config.get(name="content.oss_redirects") is False:
    #     return

    if (
        request.resource_type != interceptor.ResourceType.main_frame
        or request.request_url.scheme() in {"data", "blob"}
    ):
        return

    url = request.request_url

    if service := _should_be_redirected(url.host()):
        url = _farside_redirect(url, _pick_random(service.target))
        try:
            request.redirect(url)
        except RedirectException as e:
            message.error(str(e))

        if service.postprocess:
            url = service.postprocess()


def _farside_redirect(url: QUrl, service: str, use_fastside: bool = False) -> QUrl:
    try:
        url.setHost("fastside.link" if use_fastside else "farside.link")
        url.setPath(f"/{service}{url.path()}")
    except RedirectException as e:
        message.error(str(e))
    return url


def _pick_random[T](choices: list[T]) -> T:
    return choices[random.randint(0, len(choices) - 1)]


def _should_be_redirected(
    host: str,
    redirects: Redirects = redirects,
) -> Service | None:
    for service in redirects.values():
        for source in service.source:
            if re.search(source, host):
                return service
    return None


interceptor.register(rewrite)