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// Copyright 2019, The Tari Project
//
// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
// following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
// disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
// following disclaimer in the documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote
// products derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
// USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

use futures::FutureExt;
use std::{future::Future, pin::Pin};
use tokio::{runtime, runtime::Runtime, task, task::JoinError};

pub fn create_runtime() -> Runtime {
    tokio::runtime::Builder::new()
        .threaded_scheduler()
        .enable_io()
        .enable_time()
        .max_threads(8)
        .core_threads(4)
        .build()
        .expect("Could not create runtime")
}

/// Create a runtime and report if it panics. If there are tasks still running after the panic, this
/// will carry on running forever.
// #[deprecated(note = "use tokio_macros::test instead")]
pub fn test_async<F>(f: F)
where F: FnOnce(&mut TestRuntime) {
    let mut rt = TestRuntime::from(create_runtime());
    f(&mut rt);
    let handles = rt.handles.drain(..).collect::<Vec<_>>();
    for h in handles {
        rt.block_on(h).unwrap();
    }
}

type BoxedJoinFuture = Pin<Box<dyn Future<Output = Result<(), JoinError>>>>;

pub struct TestRuntime {
    inner: Runtime,
    handles: Vec<BoxedJoinFuture>,
}

impl TestRuntime {
    pub fn block_on<F: Future>(&mut self, future: F) -> F::Output {
        self.inner.block_on(future)
    }

    pub fn spawn<F>(&mut self, future: F)
    where
        F: Future + Send + 'static,
        F::Output: Send + 'static,
    {
        let handle = self.inner.spawn(future);
        self.handles.push(
            handle
                .map(|result| match result {
                    Ok(_) => Ok(()),
                    Err(err) => Err(err),
                })
                .boxed(),
        );
    }

    pub fn spawn_unchecked<F>(&mut self, future: F) -> task::JoinHandle<F::Output>
    where
        F: Future + Send + 'static,
        F::Output: Send + 'static,
    {
        self.inner.spawn(future)
    }

    pub fn handle(&self) -> &runtime::Handle {
        self.inner.handle()
    }
}

impl From<Runtime> for TestRuntime {
    fn from(rt: Runtime) -> Self {
        Self {
            inner: rt,
            handles: Vec::new(),
        }
    }
}