import builtins
from datetime import datetime
from typing import List, Dict, Union, Any, Optional

from pydantic import BaseModel, Field

from app.models.mirrors import Origin, Proxy


class BC2Alternative(BaseModel):
    proto: str
    type: str
    created_at: datetime
    updated_at: datetime
    url: str


class BC2Site(BaseModel):
    main_domain: str = Field(description="The main domain name of the website, excluding \"www.\" if present.",
                             examples=["bbc.co.uk", "bbc.com", "guardianproject.info"])
    available_alternatives: List[BC2Alternative]


class BypassCensorship2(BaseModel):
    version: str = Field(description="Version number of the Bypass Censorship Extension schema in use", )
    sites: List[BC2Site]

    class Config:
        title = "Bypass Censorship Version 2"


def onion_alternative(origin: Origin) -> List[Dict[str, Any]]:
    url: Optional[str] = origin.onion()
    if url is None:
        return []
    else:
        return [{
            "proto": "tor",
            "type": "eotk",
            "created_at": str(origin.added),
            "updated_at": str(origin.updated),
            "url": url}
        ]


def proxy_alternative(proxy: Proxy) -> Dict[str, Any]:
    return {
        "proto": "https",
        "type": "mirror",
        "created_at": str(proxy.added),
        "updated_at": str(proxy.updated),
        "url": proxy.url
    }


def main_domain(origin: Origin) -> str:
    # Both description and domain_name are required to be not null in the database schema
    description: str = origin.description
    if description.startswith("proxy:"):
        return description[len("proxy:"):].replace("www.", "")
    domain_name: str = origin.domain_name
    return domain_name.replace("www.", "")


def active_proxies(origin: Origin, provider: str) -> List[Proxy]:
    def _filter_fn(proxy: Proxy) -> bool:
        return proxy.url is not None and not proxy.deprecated and not proxy.destroyed and proxy.provider == provider
    return list(filter(_filter_fn, origin.proxies))


def mirror_sites(provider: str = "cloudfront") -> Dict[
        str, Union[str, List[Dict[str, Union[str, List[Dict[str, str]]]]]]]:
    return {"version": "2.0", "sites": [{"main_domain": main_domain(origin),
                                         "available_alternatives": onion_alternative(origin) + [
                                             proxy_alternative(proxy) for proxy in
                                             active_proxies(origin, provider)]} for origin in
                                        Origin.query.order_by(Origin.domain_name).all() if
                                        origin.destroyed is None]}


if getattr(builtins, "__sphinx_build__", False):
    schema = BypassCensorship2.schema_json()