import ssl
from typing import Dict, List, Union, Optional

import attr


def _strip_trailing_slashes(base_url: str) -> str:
    return base_url.rstrip("/")


@attr.s(auto_attribs=True)
class Client:
    """A class for keeping track of data related to the API

    Attributes:
        base_url: The base URL for the API, all requests are made to a relative path to this URL.
            Trailing slashes are stripped, so `https://api.svix.com/` and `https://api.svix.com`
            are equivalent.
        cookies: A dictionary of cookies to be sent with every request
        headers: A dictionary of headers to be sent with every request
        timeout: The maximum amount of a time in seconds a request can take. API functions will raise
            httpx.TimeoutException if this is exceeded.
        verify_ssl: Whether or not to verify the SSL certificate of the API server. This should be True in production,
            but can be set to False for testing purposes.
        raise_on_unexpected_status: Whether or not to raise an errors.UnexpectedStatus if the API returns a
            status code that was not documented in the source OpenAPI document.
        follow_redirects: Whether or not to follow redirects. Default value is False.
    """

    base_url: str = attr.ib(converter=_strip_trailing_slashes)
    retry_schedule: List[float]
    cookies: Dict[str, str] = attr.ib(factory=dict, kw_only=True)
    headers: Dict[str, str] = attr.ib(factory=dict, kw_only=True)
    timeout: float = attr.ib(5.0, kw_only=True)
    verify_ssl: Union[str, bool, ssl.SSLContext] = attr.ib(True, kw_only=True)
    raise_on_unexpected_status: bool = attr.ib(False, kw_only=True)
    follow_redirects: bool = attr.ib(False, kw_only=True)

    def get_headers(self) -> Dict[str, str]:
        """Get headers to be used in all endpoints"""
        return {**self.headers}

    def with_headers(self, headers: Dict[str, str]) -> "Client":
        """Get a new client matching this one with additional headers"""
        return attr.evolve(self, headers={**self.headers, **headers})

    def get_cookies(self) -> Dict[str, str]:
        return {**self.cookies}

    def with_cookies(self, cookies: Dict[str, str]) -> "Client":
        """Get a new client matching this one with additional cookies"""
        return attr.evolve(self, cookies={**self.cookies, **cookies})

    def get_timeout(self) -> float:
        return self.timeout

    def with_timeout(self, timeout: float) -> "Client":
        """Get a new client matching this one with a new timeout (in seconds)"""
        return attr.evolve(self, timeout=timeout)


@attr.s(auto_attribs=True)
class AuthenticatedClient(Client):
    """A Client which has been authenticated for use on secured endpoints"""

    token: str
    prefix: str = "Bearer"
    auth_header_name: str = "Authorization"
    proxy: Optional[str] = attr.ib(default=None)

    def get_headers(self) -> Dict[str, str]:
        """Get headers to be used in authenticated endpoints"""
        auth_header_value = f"{self.prefix} {self.token}" if self.prefix else self.token
        return {self.auth_header_name: auth_header_value, **self.headers}
