// Copyright (C) 2021 Scott Lamb <slamb@slamb.org>
// SPDX-License-Identifier: MIT OR Apache-2.0

use anyhow::{anyhow, Error};
use futures::StreamExt;
use log::{error, info};
use retina::client::{SessionGroup, SetupOptions};
use retina::codec::CodecItem;
use std::sync::Arc;

#[derive(structopt::StructOpt)]
pub struct Opts {
    #[structopt(flatten)]
    src: super::Source,
}

pub async fn run(opts: Opts) -> Result<(), Error> {
    let session_group = Arc::new(SessionGroup::default());
    let r = run_inner(opts, session_group.clone()).await;
    if let Err(e) = session_group.await_teardown().await {
        error!("TEARDOWN failed: {}", e);
    }
    r
}

async fn run_inner(opts: Opts, session_group: Arc<SessionGroup>) -> Result<(), Error> {
    let stop = tokio::signal::ctrl_c();

    let creds = super::creds(opts.src.username, opts.src.password);
    let mut session = retina::client::Session::describe(
        opts.src.url,
        retina::client::SessionOptions::default()
            .creds(creds)
            .user_agent("Retina metadata example".to_owned())
            .session_group(session_group),
    )
    .await?;
    let onvif_stream_i = session
        .streams()
        .iter()
        .position(|s| matches!(s.parameters(), Some(retina::codec::Parameters::Message(..))))
        .ok_or_else(|| anyhow!("couldn't find onvif stream"))?;
    session
        .setup(onvif_stream_i, SetupOptions::default())
        .await?;
    let mut session = session
        .play(retina::client::PlayOptions::default().ignore_zero_seq(true))
        .await?
        .demuxed()?;

    tokio::pin!(stop);
    loop {
        tokio::select! {
            item = session.next() => {
                match item.ok_or_else(|| anyhow!("EOF"))?? {
                    CodecItem::MessageFrame(m) => {
                        info!(
                            "{}: {}\n",
                            &m.timestamp(),
                            std::str::from_utf8(&m.data()[..]).unwrap(),
                        );
                    },
                    _ => continue,
                };
            },
            _ = &mut stop => {
                break;
            },
        }
    }
    Ok(())
}