/*
    This file is part of jellything (https://codeberg.org/metamuffin/jellything)
    which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
    Copyright (C) 2025 metamuffin <metamuffin.org>
*/

use anyhow::{anyhow, Result};
use jellybase::{
    common::{
        stream::{StreamContainer, StreamSpec},
        LocalTrack, Node, SourceTrackKind,
    },
    CONF,
};
use std::{fmt::Write, ops::Range, sync::Arc};
use tokio::{
    io::{AsyncWriteExt, DuplexStream},
    task::spawn_blocking,
};

pub async fn hls_master_stream(
    node: Arc<Node>,
    _local_tracks: Vec<LocalTrack>,
    segment: u64,
    container: StreamContainer,
    mut b: DuplexStream,
) -> Result<()> {
    let media = node.media.as_ref().ok_or(anyhow!("no media"))?;
    let mut out = String::new();
    writeln!(out, "#EXTM3U")?;
    writeln!(out, "#EXT-X-VERSION:4")?;
    // writeln!(out, "#EXT-X-INDEPENDENT-SEGMENTS")?;
    for (i, t) in media.tracks.iter().enumerate() {
        let uri = format!(
            "stream?{}",
            StreamSpec::HlsVariant {
                segment,
                track: i,
                container,
                format: 0
            }
            .to_query()
        );
        let r#type = match t.kind {
            SourceTrackKind::Video { .. } => "VIDEO",
            SourceTrackKind::Audio { .. } => "AUDIO",
            SourceTrackKind::Subtitles => "SUBTITLES",
        };
        writeln!(out, "#EXT-X-STREAM-INF:BANDWIDTH=5000000,TYPE={type}")?;
        writeln!(out, "{uri}")?;
    }
    tokio::spawn(async move { b.write_all(out.as_bytes()).await });
    Ok(())
}

pub async fn hls_variant_stream(
    node: Arc<Node>,
    local_tracks: Vec<LocalTrack>,
    segment: u64,
    track: usize,
    format: usize,
    container: StreamContainer,
    mut b: DuplexStream,
) -> Result<()> {
    let local_track = local_tracks.first().ok_or(anyhow!("no track"))?.to_owned();
    let media_info = node.media.to_owned().ok_or(anyhow!("no media?"))?;
    let frags = spawn_blocking(move || {
        jellyremuxer::fragment::fragment_index(
            &CONF.media_path,
            &node,
            &local_track,
            track as usize,
        )
    })
    .await??;

    let mut out = String::new();
    writeln!(out, "#EXTM3U")?;
    writeln!(out, "#EXT-X-PLAYLIST-TYPE:VOD")?;
    writeln!(out, "#EXT-X-TARGETDURATION:{}", media_info.duration)?;
    writeln!(out, "#EXT-X-VERSION:4")?;
    writeln!(out, "#EXT-X-MEDIA-SEQUENCE:0")?;

    for (i, Range { start, end }) in frags.iter().enumerate() {
        writeln!(out, "#EXTINF:{:},", end - start)?;
        writeln!(
            out,
            "stream?{}",
            StreamSpec::Fragment {
                segment,
                track,
                index: i as u64,
                container,
                format,
            }
            .to_query()
        )?;
    }

    writeln!(out, "#EXT-X-ENDLIST")?;

    tokio::spawn(async move { b.write_all(out.as_bytes()).await });
    Ok(())
}