use std::any::Any;

use serde_json::Value;

/// Helper to get around `RpcEnvironment: Sized`
pub trait AsAny {
    fn as_any(&self) -> &(dyn Any + Send);
}

impl<T: Any + Send> AsAny for T {
    fn as_any(&self) -> &(dyn Any + Send) {
        self
    }
}

/// Abstract Interface for API methods to interact with the environment
pub trait RpcEnvironment: Any + AsAny + Send {
    /// Use this to pass additional result data. It is up to the environment
    /// how the data is used.
    fn result_attrib_mut(&mut self) -> &mut Value;

    /// Access result attribute immutable
    fn result_attrib(&self) -> &Value;

    /// The environment type
    fn env_type(&self) -> RpcEnvironmentType;

    /// Set authentication id
    fn set_auth_id(&mut self, user: Option<String>);

    /// Get authentication id
    fn get_auth_id(&self) -> Option<String>;

    /// Set the client IP, should be re-set if a proxied connection was detected
    fn set_client_ip(&mut self, _client_ip: Option<std::net::SocketAddr>) {
        // dummy no-op implementation, as most environments don't need this
    }

    /// Get the (real) client IP
    fn get_client_ip(&self) -> Option<std::net::SocketAddr> {
        None // dummy no-op implementation, as most environments don't need this
    }
}

/// Environment Type
///
/// We use this to enumerate the different environment types. Some methods
/// needs to do different things when started from the command line interface,
/// or when executed from a privileged server running as root.
#[derive(PartialEq, Copy, Clone)]
pub enum RpcEnvironmentType {
    /// Command started from command line
    CLI,
    /// Access from public accessible server
    PUBLIC,
    /// Access from privileged server (run as root)
    PRIVILEGED,
}

impl core::ops::Index<&str> for &dyn RpcEnvironment {
    type Output = Value;
    fn index(&self, index: &str) -> &Value {
        self.result_attrib().index(index)
    }
}

impl core::ops::Index<&str> for &mut dyn RpcEnvironment {
    type Output = Value;
    fn index(&self, index: &str) -> &Value {
        self.result_attrib().index(index)
    }
}

impl core::ops::IndexMut<&str> for &mut dyn RpcEnvironment {
    fn index_mut(&mut self, index: &str) -> &mut Value {
        self.result_attrib_mut().index_mut(index)
    }
}