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use std::any::Any;
use std::ops::Deref;
use std::sync::{Arc, Weak};

use anyhow::{bail, Result};
use async_trait::async_trait;
use hydroflow_cli_integration::ServerPort;
use tokio::sync::RwLock;

use super::hydroflow_crate::ports::{
    HydroflowServer, HydroflowSink, HydroflowSource, ServerConfig, SourcePath,
};
use super::{Host, LaunchedHost, ResourceBatch, ResourceResult, ServerStrategy, Service};

/// Represents an unknown, third-party service that is not part of the Hydroflow ecosystem.
pub struct CustomService {
    _id: usize,
    on: Arc<RwLock<dyn Host>>,

    /// The ports that the service wishes to expose to the public internet.
    external_ports: Vec<u16>,

    launched_host: Option<Arc<dyn LaunchedHost>>,
}

impl CustomService {
    pub fn new(id: usize, on: Arc<RwLock<dyn Host>>, external_ports: Vec<u16>) -> Self {
        Self {
            _id: id,
            on,
            external_ports,
            launched_host: None,
        }
    }
}

#[async_trait]
impl Service for CustomService {
    fn collect_resources(&mut self, _resource_batch: &mut ResourceBatch) {
        if self.launched_host.is_some() {
            return;
        }

        let mut host = self
            .on
            .try_write()
            .expect("No one should be reading/writing the host while resources are collected");

        for port in self.external_ports.iter() {
            host.request_port(&ServerStrategy::ExternalTcpPort(*port));
        }
    }

    async fn deploy(&mut self, resource_result: &Arc<ResourceResult>) {
        if self.launched_host.is_some() {
            return;
        }

        let mut host_write = self.on.write().await;
        let launched = host_write.provision(resource_result);
        self.launched_host = Some(launched.await);
    }

    async fn ready(&mut self) -> Result<()> {
        Ok(())
    }

    async fn start(&mut self) {}

    async fn stop(&mut self) -> Result<()> {
        Ok(())
    }
}

pub struct CustomClientPort {
    pub on: Weak<RwLock<CustomService>>,
    client_port: Option<ServerConfig>,
}

impl CustomClientPort {
    pub fn new(on: Weak<RwLock<CustomService>>) -> Self {
        Self {
            on,
            client_port: None,
        }
    }

    pub async fn server_port(&self) -> ServerPort {
        self.client_port
            .as_ref()
            .unwrap()
            .load_instantiated(&|p| p)
            .await
    }
}

impl HydroflowSource for CustomClientPort {
    fn source_path(&self) -> SourcePath {
        SourcePath::Direct(self.on.upgrade().unwrap().try_read().unwrap().on.clone())
    }

    fn host(&self) -> Arc<RwLock<dyn Host>> {
        panic!("Custom services cannot be used as the server")
    }

    fn server(&self) -> Arc<dyn HydroflowServer> {
        panic!("Custom services cannot be used as the server")
    }

    fn record_server_config(&mut self, config: ServerConfig) {
        self.client_port = Some(config);
    }

    fn record_server_strategy(&mut self, _config: ServerStrategy) {
        panic!("Custom services cannot be used as the server")
    }
}

#[async_trait]
impl HydroflowSink for CustomClientPort {
    fn as_any_mut(&mut self) -> &mut dyn Any {
        self
    }

    fn instantiate(&self, _client_path: &SourcePath) -> Result<Box<dyn FnOnce() -> ServerConfig>> {
        bail!("Custom services cannot be used as the server")
    }

    fn instantiate_reverse(
        &self,
        server_host: &Arc<RwLock<dyn Host>>,
        server_sink: Arc<dyn HydroflowServer>,
        wrap_client_port: &dyn Fn(ServerConfig) -> ServerConfig,
    ) -> Result<Box<dyn FnOnce(&mut dyn Any) -> ServerStrategy>> {
        let client = self.on.upgrade().unwrap();
        let client_read = client.try_read().unwrap();

        let server_host_clone = server_host.clone();
        let server_host = server_host_clone.try_read().unwrap();

        let (conn_type, bind_type) =
            server_host.strategy_as_server(client_read.on.try_read().unwrap().deref())?;

        let client_port = wrap_client_port(ServerConfig::from_strategy(&conn_type, server_sink));

        let server_host_clone = server_host_clone.clone();
        Ok(Box::new(move |me| {
            let mut server_host = server_host_clone.try_write().unwrap();
            me.downcast_mut::<CustomClientPort>().unwrap().client_port = Some(client_port);
            bind_type(server_host.as_any_mut())
        }))
    }
}