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use std::cell::RefCell;
use std::rc::Rc;

use futures::{FutureExt, TryFutureExt};
use ya_runtime_api::server::{
    AsyncResponse, KillProcess, RunProcess, RunProcessResp, RuntimeService,
};

use crate::runtime::RuntimeMode;
use crate::{Context, Runtime, RuntimeDef};

pub struct Server<R: Runtime> {
    pub(crate) runtime: Rc<RefCell<R>>,
    pub(crate) ctx: Rc<RefCell<Context<R>>>,
}

impl<R: Runtime> Server<R> {
    pub fn new(runtime: R, ctx: Context<R>) -> Self {
        Self {
            runtime: Rc::new(RefCell::new(runtime)),
            ctx: Rc::new(RefCell::new(ctx)),
        }
    }
}

impl<R: Runtime> RuntimeService for Server<R> {
    fn hello(&self, _version: &str) -> AsyncResponse<'_, String> {
        async { Ok(<R as RuntimeDef>::VERSION.to_owned()) }.boxed_local()
    }

    fn run_process(&self, run: RunProcess) -> AsyncResponse<'_, RunProcessResp> {
        let mut runtime = self.runtime.borrow_mut();
        let mut ctx = self.ctx.borrow_mut();
        runtime
            .run_command(run, RuntimeMode::Server, &mut ctx)
            .then(|result| async move {
                match result {
                    Ok(pid) => Ok(RunProcessResp { pid }),
                    Err(err) => Err(err.into()),
                }
            })
            .boxed_local()
    }

    fn kill_process(&self, kill: KillProcess) -> AsyncResponse<'_, ()> {
        let mut runtime = self.runtime.borrow_mut();
        let mut ctx = self.ctx.borrow_mut();
        runtime
            .kill_command(kill, &mut ctx)
            .map_err(Into::into)
            .boxed_local()
    }

    fn shutdown(&self) -> AsyncResponse<'_, ()> {
        let mut runtime = self.runtime.borrow_mut();
        let mut ctx = self.ctx.borrow_mut();
        runtime.stop(&mut ctx).map_err(Into::into).boxed_local()
    }
}