/*
    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 crate::{fragment_index::fragment_index, stream_info, SMediaInfo};
use anyhow::Result;
use jellystream_types::{FormatNum, StreamContainer, StreamSpec, TrackKind, TrackNum};
use std::{
    fmt::Write,
    io::{Cursor, Read},
    ops::Range,
    sync::Arc,
};

pub fn hls_multivariant_stream(
    info: Arc<SMediaInfo>,
    container: StreamContainer,
) -> Result<Box<dyn Read + Send + Sync>> {
    let (_iinfo, info) = stream_info(info)?;

    let mut out = String::new();
    writeln!(out, "#EXTM3U")?;
    writeln!(out, "#EXT-X-VERSION:4")?;
    // writeln!(out, "#EXT-X-INDEPENDENT-SEGMENTS")?;
    for (i, t) in info.tracks.iter().enumerate() {
        let uri = format!(
            "stream{}",
            StreamSpec::HlsVariant {
                track: i,
                container,
                format: 0
            }
            .to_query()
        );
        let r#type = match t.kind {
            TrackKind::Video => "VIDEO",
            TrackKind::Audio => "AUDIO",
            TrackKind::Subtitle => "SUBTITLES",
        };
        // TODO bw
        writeln!(out, "#EXT-X-STREAM-INF:BANDWIDTH=5000000,TYPE={type}")?;
        writeln!(out, "{uri}")?;
    }

    Ok(Box::new(Cursor::new(out)))
}

pub fn hls_variant_stream(
    info: Arc<SMediaInfo>,
    track: TrackNum,
    format: FormatNum,
    container: StreamContainer,
) -> Result<Box<dyn Read + Send + Sync>> {
    let frags = fragment_index(info.clone(), track)?;
    let (_, info) = stream_info(info)?;

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

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

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

    Ok(Box::new(Cursor::new(out)))
}