import abc
import urllib.request
from enum import Enum
from dataclasses import dataclass
from typing_extensions import TypeAlias
from http.cookiejar import Cookie, CookieJar
from typing import IO, Any, Union, Callable, Optional
from collections.abc import Mapping, Iterator, Awaitable, MutableMapping

from yarl import URL as URL
from multidict import CIMultiDict

RawURL: TypeAlias = tuple[bytes, bytes, Optional[int], bytes]

SimpleQuery: TypeAlias = Union[str, int, float]
QueryVariable: TypeAlias = Union[SimpleQuery, list[SimpleQuery]]
QueryTypes: TypeAlias = Union[
    None, str, Mapping[str, QueryVariable], list[tuple[str, SimpleQuery]]
]

HeaderTypes: TypeAlias = Union[
    None,
    CIMultiDict[str],
    dict[str, str],
    list[tuple[str, str]],
]

CookieTypes: TypeAlias = Union[
    None, "Cookies", CookieJar, dict[str, str], list[tuple[str, str]]
]

ContentTypes: TypeAlias = Union[str, bytes, None]
DataTypes: TypeAlias = Union[dict, None]
FileContent: TypeAlias = Union[IO[bytes], bytes]
FileType: TypeAlias = tuple[Optional[str], FileContent, Optional[str]]
FileTypes: TypeAlias = Union[
    # file (or bytes)
    FileContent,
    # (filename, file (or bytes))
    tuple[Optional[str], FileContent],
    # (filename, file (or bytes), content_type)
    FileType,
]
FilesTypes: TypeAlias = Union[dict[str, FileTypes], list[tuple[str, FileTypes]], None]


class HTTPVersion(Enum):
    H10 = "1.0"
    H11 = "1.1"
    H2 = "2"


class Request:
    def __init__(
        self,
        method: Union[str, bytes],
        url: Union["URL", str, RawURL],
        *,
        params: QueryTypes = None,
        headers: HeaderTypes = None,
        cookies: CookieTypes = None,
        content: ContentTypes = None,
        data: DataTypes = None,
        json: Any = None,
        files: FilesTypes = None,
        version: Union[str, HTTPVersion] = HTTPVersion.H11,
        timeout: Optional[float] = None,
        proxy: Optional[str] = None,
    ):
        # method
        self.method: str = (
            method.decode("ascii").upper()
            if isinstance(method, bytes)
            else method.upper()
        )
        # http version
        self.version: HTTPVersion = HTTPVersion(version)
        # timeout
        self.timeout: Optional[float] = timeout
        # proxy
        self.proxy: Optional[str] = proxy

        # url
        if isinstance(url, tuple):
            scheme, host, port, path = url
            url = URL.build(
                scheme=scheme.decode("ascii"),
                host=host.decode("ascii"),
                port=port,
                path=path.decode("ascii"),
            )
        else:
            url = URL(url)

        if params is not None:
            url = url.update_query(params)
        self.url: URL = url

        # headers
        self.headers: CIMultiDict[str] = (
            CIMultiDict(headers) if headers is not None else CIMultiDict()
        )
        # cookies
        self.cookies = Cookies(cookies)

        # body
        self.content: ContentTypes = content
        self.data: DataTypes = data
        self.json: Any = json
        self.files: Optional[list[tuple[str, FileType]]] = None
        if files:
            self.files = []
            files_ = files.items() if isinstance(files, dict) else files
            for name, file_info in files_:
                if not isinstance(file_info, tuple):
                    self.files.append((name, (name, file_info, None)))
                elif len(file_info) == 2:
                    self.files.append((name, (file_info[0], file_info[1], None)))
                else:
                    self.files.append((name, file_info))  # type: ignore

    def __repr__(self) -> str:
        return f"{self.__class__.__name__}(method={self.method!r}, url='{self.url!s}')"


class Response:
    def __init__(
        self,
        status_code: int,
        *,
        headers: HeaderTypes = None,
        content: ContentTypes = None,
        request: Optional[Request] = None,
    ):
        # status code
        self.status_code: int = status_code

        # headers
        self.headers: CIMultiDict[str] = (
            CIMultiDict(headers) if headers is not None else CIMultiDict()
        )
        # body
        self.content: ContentTypes = content

        # request
        self.request: Optional[Request] = request

    def __repr__(self) -> str:
        return f"{self.__class__.__name__}(status_code={self.status_code!r})"


class WebSocket(abc.ABC):
    def __init__(self, *, request: Request):
        self.request: Request = request

    def __repr__(self) -> str:
        return f"{self.__class__.__name__}('{self.request.url!s}')"

    @property
    @abc.abstractmethod
    def closed(self) -> bool:
        """连接是否已经关闭"""
        raise NotImplementedError

    @abc.abstractmethod
    async def accept(self) -> None:
        """接受 WebSocket 连接请求"""
        raise NotImplementedError

    @abc.abstractmethod
    async def close(self, code: int = 1000, reason: str = "") -> None:
        """关闭 WebSocket 连接请求"""
        raise NotImplementedError

    @abc.abstractmethod
    async def receive(self) -> Union[str, bytes]:
        """接收一条 WebSocket text/bytes 信息"""
        raise NotImplementedError

    @abc.abstractmethod
    async def receive_text(self) -> str:
        """接收一条 WebSocket text 信息"""
        raise NotImplementedError

    @abc.abstractmethod
    async def receive_bytes(self) -> bytes:
        """接收一条 WebSocket binary 信息"""
        raise NotImplementedError

    async def send(self, data: Union[str, bytes]) -> None:
        """发送一条 WebSocket text/bytes 信息"""
        if isinstance(data, str):
            await self.send_text(data)
        elif isinstance(data, bytes):
            await self.send_bytes(data)
        else:
            raise TypeError("WebSocker send method expects str or bytes!")

    @abc.abstractmethod
    async def send_text(self, data: str) -> None:
        """发送一条 WebSocket text 信息"""
        raise NotImplementedError

    @abc.abstractmethod
    async def send_bytes(self, data: bytes) -> None:
        """发送一条 WebSocket binary 信息"""
        raise NotImplementedError


class Cookies(MutableMapping):
    def __init__(self, cookies: CookieTypes = None) -> None:
        self.jar: CookieJar = cookies if isinstance(cookies, CookieJar) else CookieJar()
        if cookies is not None and not isinstance(cookies, CookieJar):
            if isinstance(cookies, dict):
                for key, value in cookies.items():
                    self.set(key, value)
            elif isinstance(cookies, list):
                for key, value in cookies:
                    self.set(key, value)
            elif isinstance(cookies, Cookies):
                for cookie in cookies.jar:
                    self.jar.set_cookie(cookie)
            else:
                raise TypeError(f"Cookies must be dict or list, not {type(cookies)}")

    def set(self, name: str, value: str, domain: str = "", path: str = "/") -> None:
        cookie = Cookie(
            version=0,
            name=name,
            value=value,
            port=None,
            port_specified=False,
            domain=domain,
            domain_specified=bool(domain),
            domain_initial_dot=domain.startswith("."),
            path=path,
            path_specified=bool(path),
            secure=False,
            expires=None,
            discard=True,
            comment=None,
            comment_url=None,
            rest={},
            rfc2109=False,
        )
        self.jar.set_cookie(cookie)

    def get(  # pyright: ignore[reportIncompatibleMethodOverride]
        self,
        name: str,
        default: Optional[str] = None,
        domain: Optional[str] = None,
        path: Optional[str] = None,
    ) -> Optional[str]:
        value: Optional[str] = None
        for cookie in self.jar:
            if (
                cookie.name == name
                and (domain is None or cookie.domain == domain)
                and (path is None or cookie.path == path)
            ):
                if value is not None:
                    message = f"Multiple cookies exist with name={name}"
                    raise ValueError(message)
                value = cookie.value

        return default if value is None else value

    def delete(
        self, name: str, domain: Optional[str] = None, path: Optional[str] = None
    ) -> None:
        if domain is not None and path is not None:
            return self.jar.clear(domain, path, name)

        remove = [
            cookie
            for cookie in self.jar
            if cookie.name == name
            and (domain is None or cookie.domain == domain)
            and (path is None or cookie.path == path)
        ]

        for cookie in remove:
            self.jar.clear(cookie.domain, cookie.path, cookie.name)

    def clear(self, domain: Optional[str] = None, path: Optional[str] = None) -> None:
        self.jar.clear(domain, path)

    def update(  # pyright: ignore[reportIncompatibleMethodOverride]
        self, cookies: CookieTypes = None
    ) -> None:
        cookies = Cookies(cookies)
        for cookie in cookies.jar:
            self.jar.set_cookie(cookie)

    def as_header(self, request: Request) -> dict[str, str]:
        urllib_request = self._CookieCompatRequest(request)
        self.jar.add_cookie_header(urllib_request)
        return urllib_request.added_headers

    def __setitem__(self, name: str, value: str) -> None:
        return self.set(name, value)

    def __getitem__(self, name: str) -> str:
        value = self.get(name)
        if value is None:
            raise KeyError(name)
        return value

    def __delitem__(self, name: str) -> None:
        return self.delete(name)

    def __len__(self) -> int:
        return len(self.jar)

    def __iter__(self) -> Iterator[Cookie]:
        return iter(self.jar)

    def __repr__(self) -> str:
        cookies_repr = ", ".join(
            f"Cookie({cookie.name}={cookie.value} for {cookie.domain})"
            for cookie in self.jar
        )
        return f"{self.__class__.__name__}({cookies_repr})"

    class _CookieCompatRequest(urllib.request.Request):
        def __init__(self, request: Request) -> None:
            super().__init__(
                url=str(request.url),
                headers=dict(request.headers),
                method=request.method,
            )
            self.request = request
            self.added_headers: dict[str, str] = {}

        def add_unredirected_header(  # pyright: ignore[reportIncompatibleMethodOverride]
            self, key: str, value: str
        ) -> None:
            super().add_unredirected_header(key, value)
            self.added_headers[key] = value


@dataclass
class HTTPServerSetup:
    """HTTP 服务器路由配置。"""

    path: URL  # path should not be absolute, check it by URL.is_absolute() == False
    method: str
    name: str
    handle_func: Callable[[Request], Awaitable[Response]]


@dataclass
class WebSocketServerSetup:
    """WebSocket 服务器路由配置。"""

    path: URL  # path should not be absolute, check it by URL.is_absolute() == False
    name: str
    handle_func: Callable[[WebSocket], Awaitable[Any]]