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use crate::common::JoinHandle;
use crate::scheduler::{Scheduler, SchedulerImpl};
use std::ffi::{c_char, CStr, CString};
use std::io::{Error, ErrorKind};

#[allow(missing_docs)]
#[repr(C)]
#[derive(Debug)]
pub struct JoinHandleImpl<'j>(*const SchedulerImpl<'j>, *const c_char);

impl<'j> JoinHandle<SchedulerImpl<'j>> for JoinHandleImpl<'j> {
    #[allow(box_pointers)]
    fn new(pool: *const SchedulerImpl<'j>, name: &str) -> Self {
        let boxed: &'static mut CString = Box::leak(Box::from(
            CString::new(name).expect("init JoinHandle failed!"),
        ));
        let cstr: &'static CStr = boxed.as_c_str();
        JoinHandleImpl(pool, cstr.as_ptr())
    }

    fn get_name(&self) -> std::io::Result<&str> {
        unsafe { CStr::from_ptr(self.1) }
            .to_str()
            .map_err(|_| Error::new(ErrorKind::InvalidInput, "Invalid coroutine name"))
    }

    fn timeout_at_join(&self, timeout_time: u64) -> std::io::Result<Result<Option<usize>, &str>> {
        let name = self.get_name()?;
        if name.is_empty() {
            return Err(Error::new(
                ErrorKind::InvalidInput,
                "Invalid coroutine name",
            ));
        }
        let scheduler = unsafe { &*self.0 };
        loop {
            if 0 == scheduler.try_timeout_schedule(timeout_time)? {
                return Err(Error::new(ErrorKind::TimedOut, "timeout"));
            }
            if let Some(r) = scheduler.try_get_co_result(name) {
                return Ok(r);
            }
        }
    }
}

#[allow(box_pointers)]
#[cfg(test)]
mod tests {
    use super::*;
    use std::sync::{Arc, Condvar, Mutex};
    use std::time::Duration;

    #[test]
    fn join_test() -> std::io::Result<()> {
        let pair = Arc::new((Mutex::new(true), Condvar::new()));
        let pair2 = Arc::clone(&pair);
        let handler = std::thread::Builder::new()
            .name("test_join".to_string())
            .spawn(move || {
                let pool = SchedulerImpl::default();
                let handle1 = pool
                    .submit_co(
                        |_, _| {
                            println!("[coroutine1] launched");
                            Some(3)
                        },
                        None,
                    )
                    .unwrap();
                let handle2 = pool
                    .submit_co(
                        |_, _| {
                            println!("[coroutine2] launched");
                            Some(4)
                        },
                        None,
                    )
                    .unwrap();
                assert_eq!(handle1.join().unwrap().unwrap().unwrap(), 3);
                assert_eq!(handle2.join().unwrap().unwrap().unwrap(), 4);

                let (lock, cvar) = &*pair2;
                let mut pending = lock.lock().unwrap();
                *pending = false;
                // notify the condvar that the value has changed.
                cvar.notify_one();
            })
            .expect("failed to spawn thread");

        // wait for the thread to start up
        let (lock, cvar) = &*pair;
        let result = cvar
            .wait_timeout_while(
                lock.lock().unwrap(),
                Duration::from_millis(3000),
                |&mut pending| pending,
            )
            .unwrap();
        if result.1.timed_out() {
            Err(Error::new(ErrorKind::TimedOut, "join failed"))
        } else {
            handler.join().unwrap();
            Ok(())
        }
    }

    #[test]
    fn timed_join_test() -> std::io::Result<()> {
        let pair = Arc::new((Mutex::new(true), Condvar::new()));
        let pair2 = Arc::clone(&pair);
        let handler = std::thread::Builder::new()
            .name("test_timed_join".to_string())
            .spawn(move || {
                let pool = SchedulerImpl::default();
                let handle = pool
                    .submit_co(
                        |_, _| {
                            println!("[coroutine3] launched");
                            Some(5)
                        },
                        None,
                    )
                    .unwrap();
                let error = handle.timeout_join(Duration::from_nanos(0)).unwrap_err();
                assert_eq!(error.kind(), ErrorKind::TimedOut);
                assert_eq!(
                    handle
                        .timeout_join(Duration::from_secs(1))
                        .unwrap()
                        .unwrap()
                        .unwrap(),
                    5
                );

                let (lock, cvar) = &*pair2;
                let mut pending = lock.lock().unwrap();
                *pending = false;
                // notify the condvar that the value has changed.
                cvar.notify_one();
            })
            .expect("failed to spawn thread");

        // wait for the thread to start up
        let (lock, cvar) = &*pair;
        let result = cvar
            .wait_timeout_while(
                lock.lock().unwrap(),
                Duration::from_millis(3000),
                |&mut pending| pending,
            )
            .unwrap();
        if result.1.timed_out() {
            Err(Error::new(ErrorKind::TimedOut, "timed join failed"))
        } else {
            handler.join().unwrap();
            Ok(())
        }
    }
}