from .utils import format_environment


class ProxyConfig(dict):
    """
    Hold the client's proxy configuration
    """

    @property
    def http(self):
        return self.get("http")

    @property
    def https(self):
        return self.get("https")

    @property
    def ftp(self):
        return self.get("ftp")

    @property
    def no_proxy(self):
        return self.get("no_proxy")

    @staticmethod
    def from_dict(config):
        """
        Instantiate a new ProxyConfig from a dictionary that represents a
        client configuration, as described in `the documentation`_.

        .. _the documentation:
            https://docs.docker.com/network/proxy/#configure-the-docker-client
        """
        return ProxyConfig(
            http=config.get("httpProxy"),
            https=config.get("httpsProxy"),
            ftp=config.get("ftpProxy"),
            no_proxy=config.get("noProxy"),
        )

    def get_environment(self):
        """
        Return a dictionary representing the environment variables used to
        set the proxy settings.
        """
        env = {}
        if self.http:
            env["http_proxy"] = env["HTTP_PROXY"] = self.http
        if self.https:
            env["https_proxy"] = env["HTTPS_PROXY"] = self.https
        if self.ftp:
            env["ftp_proxy"] = env["FTP_PROXY"] = self.ftp
        if self.no_proxy:
            env["no_proxy"] = env["NO_PROXY"] = self.no_proxy
        return env

    def inject_proxy_environment(self, environment):
        """
        Given a list of strings representing environment variables, prepend the
        environment variables corresponding to the proxy settings.
        """
        if not self:
            return environment

        proxy_env = format_environment(self.get_environment())
        if not environment:
            return proxy_env
        # It is important to prepend our variables, because we want the
        # variables defined in "environment" to take precedence.
        return proxy_env + environment

    def __str__(self):
        return "ProxyConfig(" f"http={self.http}, https={self.https}, " f"ftp={self.ftp}, no_proxy={self.no_proxy}" ")"
