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    use crate::error::Error;
    use crate::layouts::Entry;
    use crate::CompiledShaders;
    use notify::{RecommendedWatcher, RecursiveMode, Watcher};
    use std::path::{Path, PathBuf};
    use std::sync::mpsc;
    use std::sync::mpsc::{Receiver, Sender};
    use std::thread;
    use std::time::Duration;

    pub struct Watch {
        _handler: Handler,
        pub rx: Receiver<Result<Message, Error>>,
    }

    enum Loader {
        Graphics(GraphicsLoader),
        Compute(ComputeLoader),
    }

    enum SrcPath {
        Graphics(PathBuf, PathBuf),
        Compute(PathBuf),
    }

    struct GraphicsLoader {
        vertex: PathBuf,
        fragment: PathBuf,
        tx: Sender<Result<Message, Error>>,
    }

    struct ComputeLoader {
        compute: PathBuf,
        tx: Sender<Result<Message, Error>>,
    }

    pub struct Message {
        pub shaders: CompiledShaders,
        pub entry: Entry,
    }

    impl Watch {
        /// Paths to the vertex and fragment shaders.
        /// Frequency is how often the watcher will check the directory.
        pub fn create<T>(vertex: T, fragment: T, frequency: Duration) -> Result<Self, Error>
        where
            T: AsRef<Path>,
        {
            let src_path = SrcPath::Graphics(
                vertex.as_ref().to_path_buf(),
                fragment.as_ref().to_path_buf()
                );
            let (handler, rx) = create_watch(
                src_path,
                frequency,
            )?;
            Ok(Watch {
                _handler: handler,
                rx,
            })
        }

        pub fn create_compute<T>(compute: T, frequency: Duration) -> Result<Self, Error>
        where
            T: AsRef<Path>,
        {
            let src_path = SrcPath::Compute(
                compute.as_ref(). to_path_buf());
            let (handler, rx) = create_watch(
                src_path,
                frequency,
            )?;
            Ok(Watch {
                _handler: handler,
                rx,
            })
        }
    }

    impl GraphicsLoader {
        fn create(vertex: PathBuf, fragment: PathBuf) -> (Self, Receiver<Result<Message, Error>>) {
            let (tx, rx) = mpsc::channel();
            let loader = GraphicsLoader {
                vertex,
                fragment,
                tx,
            };
            loader.reload();
            (loader, rx)
        }

        fn reload(&self) {
    //        match crate::load(&self.vertex, &self.fragment) {
    //            Ok(shaders) => {
    //                let entry = crate::parse(&shaders);
    //                let msg = entry.map(|entry| Message { shaders, entry });
    //                self.tx.send(msg).ok()
    //            }
    //            Err(e) => self.tx.send(Err(e)).ok(),
    //        };
        }
    }

    impl ComputeLoader {
        fn create(compute: PathBuf) -> (Self, Receiver<Result<Message, Error>>) {
            let (tx, rx) = mpsc::channel();
            let loader = ComputeLoader {
                compute,
                tx,
            };
            loader.reload();
            (loader, rx)
        }

        fn reload(&self) {
    //        match crate::load_compute(&self.compute) {
    //            Ok(shaders) => {
    //                let entry = crate::parse_compute(&shaders);
    //                let msg = entry.map(|entry| Message { shaders, entry });
    //                self.tx.send(msg).ok()
    //            }
    //            Err(e) => self.tx.send(Err(e)).ok(),
    //        };
        }
    }

    impl Loader {
        fn reload(&self) {
            match self {
                Loader::Graphics(g) => g.reload(),
                Loader::Compute(g) => g.reload(),
            }
        }
    }

    struct Handler {
        thread_tx: mpsc::Sender<()>,
        handle: Option<thread::JoinHandle<()>>,
        _watcher: RecommendedWatcher,
    }

    impl Drop for Handler {
        fn drop(&mut self) {
            self.thread_tx.send(()).ok();
            if let Some(h) = self.handle.take() {
                h.join().ok();
            }
        }
    }

    fn create_watch(
        src_path: SrcPath,
        frequency: Duration
    ) -> Result<(Handler, mpsc::Receiver<Result<Message, Error>>), Error> {
        let (notify_tx, notify_rx) = mpsc::channel();
        let (thread_tx, thread_rx) = mpsc::channel();
        let mut watcher: RecommendedWatcher =
            Watcher::new(notify_tx, frequency).map_err(Error::FileWatch)?;

        let (loader, rx) = match src_path {
            SrcPath::Graphics(vert_path, frag_path) => {
                let mut vp = vert_path.clone();
                let mut fp = frag_path.clone();
                vp.pop();
                fp.pop();
                watcher
                    .watch(&vp, RecursiveMode::NonRecursive)
                    .map_err(Error::FileWatch)?;
                if vp != fp {
                    watcher
                        .watch(&fp, RecursiveMode::NonRecursive)
                        .map_err(Error::FileWatch)?;
                }

                let (loader, rx) = GraphicsLoader::create(vert_path, frag_path);
                (Loader::Graphics(loader), rx)
            }
            SrcPath::Compute(compute_path) => {
                let mut cp = compute_path.clone();
                cp.pop();
                watcher
                    .watch(&cp, RecursiveMode::NonRecursive)
                    .map_err(Error::FileWatch)?;

                let (loader, rx) = ComputeLoader::create(compute_path);
                (Loader::Compute(loader), rx)
            }
        };

        let handle = thread::spawn(move || 'watch_loop: loop {
            if thread_rx.try_recv().is_ok() {
                break 'watch_loop;
            }
            if let Ok(notify::DebouncedEvent::Create(_)) | Ok(notify::DebouncedEvent::Write(_)) =
                notify_rx.recv_timeout(Duration::from_secs(1))
            {
                loader.reload();
            }
        });
        let handle = Some(handle);
        let handler = Handler {
            thread_tx,
            handle,
            _watcher: watcher,
        };
        Ok((handler, rx))
    }

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