use notify::DebouncedEvent::{Create, Remove, Rename};
use notify::{watcher, RecursiveMode, Watcher};
use std::{
    ffi::OsStr,
    path::Path,
    sync::{
        mpsc::{channel, Receiver},
        {Arc, Mutex},
    },
    thread::sleep,
    time::Duration,
};

use walkdir::WalkDir;

use tokio::runtime::Builder;

#[derive(Debug, Clone)]
pub struct Source {
    stop: Arc<Mutex<bool>>,
    nodes: Arc<Mutex<Vec<String>>>,
    index: usize,
}

impl Source {
    pub fn new(path: String) -> Self {
        let mut file_list = vec![];

        for entry in WalkDir::new(path.clone())
            .into_iter()
            .filter_map(|e| e.ok())
        {
            if entry.path().is_file() {
                let ext = file_extension(entry.path());

                if ext.is_some()
                    && ["mp4".to_string(), "mkv".to_string()]
                        .clone()
                        .contains(&ext.unwrap().to_lowercase())
                {
                    file_list.push(entry.path().display().to_string());
                }
            }
        }

        Self {
            stop: Arc::new(Mutex::new(false)),
            nodes: Arc::new(Mutex::new(file_list)),
            index: 0,
        }
    }
}

impl Iterator for Source {
    type Item = String;

    fn next(&mut self) -> Option<Self::Item> {
        if self.index < self.nodes.lock().unwrap().len() {
            let current_file = self.nodes.lock().unwrap()[self.index].clone();
            self.index += 1;

            Some(current_file)
        } else {
            let current_file = self.nodes.lock().unwrap()[0].clone();

            self.index = 1;

            Some(current_file)
        }
    }
}

async fn watch(
    receiver: Receiver<notify::DebouncedEvent>,
    stop: Arc<Mutex<bool>>,
    sources: Arc<Mutex<Vec<String>>>,
) {
    loop {
        if *stop.lock().unwrap() {
            println!("in stop: {}", stop.lock().unwrap());
            break;
        }

        match receiver.recv() {
            Ok(event) => match event {
                Create(new_path) => {
                    sources.lock().unwrap().push(new_path.display().to_string());
                    println!("Create new file: {:?}", new_path);
                }
                Remove(old_path) => {
                    sources
                        .lock()
                        .unwrap()
                        .retain(|x| x != &old_path.display().to_string());
                    println!("Remove file: {:?}", old_path);
                }
                Rename(old_path, new_path) => {
                    let i = sources
                        .lock()
                        .unwrap()
                        .iter()
                        .position(|x| *x == old_path.display().to_string())
                        .unwrap();
                    sources.lock().unwrap()[i] = new_path.display().to_string();
                    println!("Rename file: {:?} to {:?}", old_path, new_path);
                }
                _ => (),
            },
            Err(e) => {
                println!("{:?}", e);
            }
        }

        sleep(Duration::from_secs(1));
    }
}

fn file_extension(filename: &Path) -> Option<&str> {
    filename.extension().and_then(OsStr::to_str)
}

fn main() {
    let path = "/home/jonathan/Videos/tv-media/ADtv/01 - Intro".to_string();
    let sources = Source::new(path.clone());
    let stop = Arc::clone(&sources.stop);

    let (sender, receiver) = channel();
    let runtime = Builder::new_multi_thread()
        .worker_threads(1)
        .thread_name("file_watcher")
        .enable_all()
        .build()
        .expect("Creating Tokio runtime");

    let mut watcher = watcher(sender, Duration::from_secs(2)).unwrap();
    watcher
        .watch(path.clone(), RecursiveMode::Recursive)
        .unwrap();

    runtime.spawn(watch(
        receiver,
        Arc::clone(&stop),
        Arc::clone(&sources.nodes),
    ));

    let mut count = 0;

    {for node in sources {
        println!("task: {:?}", node);
        sleep(Duration::from_secs(1));

        count += 1;

        if count == 5 {
            break;
        }
    }}

    *stop.lock().unwrap() = true;
    watcher.unwatch(path).unwrap();

    println!("after loop");
    // watch.stop();

    // watch.run = false;

    //runtime.block_on(watch.stop());
}