use super::{Node, NodeContext, NodeKind, NodeRequest, NodeResponse};
use crate::{config::DynNode, error::ServiceError};
use futures::Future;
use hyper::header::HOST;
use serde::Deserialize;
use serde_yml::Value;
use std::{collections::HashMap, pin::Pin, sync::Arc};

#[derive(Deserialize)]
#[serde(transparent)]
struct Hosts(HashMap<String, DynNode>);

pub struct HostsKind;
impl NodeKind for HostsKind {
    fn name(&self) -> &'static str {
        "hosts"
    }
    fn instanciate(&self, config: Value) -> anyhow::Result<Arc<dyn Node>> {
        Ok(Arc::new(serde_yml::from_value::<Hosts>(config)?))
    }
}
impl Node for Hosts {
    fn handle<'a>(
        &'a self,
        context: &'a mut NodeContext,
        request: NodeRequest,
    ) -> Pin<Box<dyn Future<Output = Result<NodeResponse, ServiceError>> + Send + Sync + 'a>> {
        Box::pin(async move {
            let host = request
                .headers()
                .get(HOST)
                .and_then(|e| e.to_str().ok())
                .map(remove_port);

            let node = match host {
                Some(host) => self
                    .0
                    .get(host)
                    .or_else(|| self.0.get(":fallback"))
                    .ok_or(ServiceError::UnknownHost)?,
                None => self.0.get(":none").ok_or(ServiceError::NoHost)?,
            };

            node.handle(context, request).await
        })
    }
}

pub fn remove_port(s: &str) -> &str {
    s.split_once(":").map(|(s, _)| s).unwrap_or(s)
}