use std::io::Result;
use std::path::Path;
use std::process::{Child, Command, ExitStatus, Stdio};

use actix::prelude::*;
use log::{debug, trace};

// ffmpeg -i test.mp4 -c:v h264 -flags +cgop -g 30 -hls_time 3 out.m3u8
// ffmpeg -i "filename.mp4" -preset veryfast -c:v libx264 -f hls -hls_list_size 100 -hls_time 2 -crf 24 -vf scale=1080:-2,setsar=1:1 attempt/vid_out.m3u8

pub struct StreamActor;

impl Actor for StreamActor {
    type Context = Context<Self>;
}

pub struct ProcessMessage(pub String, pub Child);

impl Message for ProcessMessage {
    type Result = Result<ExitStatus>;
}

impl Handler<ProcessMessage> for StreamActor {
    type Result = Result<ExitStatus>;

    fn handle(&mut self, msg: ProcessMessage, _ctx: &mut Self::Context) -> Self::Result {
        trace!("Message received");
        let mut process = msg.1;
        let result = process.wait();

        debug!(
            "Finished waiting for: {:?}. Code: {:?}",
            msg.0,
            result
                .as_ref()
                .map_or(-1, |status| status.code().unwrap_or(-1))
        );
        result
    }
}

pub async fn create_playlist(video_path: &str, playlist_file: &str) -> Result<Child> {
    if Path::new(playlist_file).exists() {
        debug!("Playlist already exists: {}", playlist_file);
        return Err(std::io::Error::from(std::io::ErrorKind::AlreadyExists));
    }

    let result = Command::new("ffmpeg")
        .arg("-i")
        .arg(video_path)
        .arg("-c:v")
        .arg("h264")
        .arg("-crf")
        .arg("21")
        .arg("-preset")
        .arg("veryfast")
        .arg("-hls_time")
        .arg("3")
        .arg("-hls_list_size")
        .arg("100")
        .arg("-vf")
        .arg("scale=1080:-2,setsar=1:1")
        .arg(playlist_file)
        .stdout(Stdio::null())
        .stderr(Stdio::null())
        .spawn();

    let start_time = std::time::Instant::now();
    loop {
        actix::clock::delay_for(std::time::Duration::from_secs(1)).await;

        if Path::new(playlist_file).exists()
            || std::time::Instant::now() - start_time > std::time::Duration::from_secs(5)
        {
            break;
        }
    }

    result
}

pub fn generate_video_thumbnail(path: &Path, destination: &Path) {
    Command::new("ffmpeg")
        .arg("-ss")
        .arg("3")
        .arg("-i")
        .arg(path.to_str().unwrap())
        .arg("-vframes")
        .arg("1")
        .arg("-f")
        .arg("image2")
        .arg(destination)
        .output()
        .expect("Failure to create video frame");
}