soundcloud-rs 0.2.0

use std::error::Error;
use std::path::PathBuf;
use ffmpeg_sidecar::command::FfmpegCommand;
use ffmpeg_sidecar::download;

use crate::client::client::Client;
use crate::models::query::{TracksQuery, Paging};
use crate::models::response::{Track, Tracks};
use crate::response::{Stream, StreamType, Transcoding};

impl Client {
    pub async fn search_tracks(&self, query: Option<&TracksQuery>) -> Result<Tracks, Box<dyn Error>> {
        let tracks: Tracks = self.get("search/tracks", query).await?;
        Ok(tracks)
    }

    pub async fn get_track_by_id(&self, id: &str) -> Result<Track, Box<dyn Error>> {
        let url = format!("tracks/{}", id);
        let resp: Track = self.get(&url, None::<&()>).await?;
        Ok(resp)
    }

    pub async fn get_track_by_urn(&self, urn: &str) -> Result<Track, Box<dyn Error>> {
        let url = format!("tracks/{}", urn);
        let resp: Track = self.get(&url, None::<&()>).await?;
        Ok(resp)
    }

    pub async fn get_track_related_by_id(&self, id: &str, pagination: Option<&Paging>) -> Result<Tracks, Box<dyn Error>> {
        let url = format!("tracks/{}/related", id);
        let resp: Tracks  = self.get(&url, pagination).await?;
        Ok(resp)
    }

    pub async fn get_track_related_by_urn(&self, urn: &str, pagination: Option<&Paging>) -> Result<Tracks, Box<dyn Error>> {
        let url = format!("tracks/{}/related", urn);
        let resp: Tracks  = self.get(&url, pagination).await?;
        Ok(resp)
    }

    pub async fn download_track(&self, track: &Track, stream_type: Option<StreamType>, destination: Option<&str>, filename: Option<&str>) -> Result<(), Box<dyn Error>> {
        if track.title.is_none() {
            return Err("Track title is missing".into());
        }
        let title = match filename {
            Some(filename) => filename,
            None => track.title.as_ref().unwrap(),
        };

        let transcodings = track.media.as_ref().unwrap().transcodings.as_ref().unwrap();
        if transcodings.is_empty() {
            return Err("No available download options".into());
        }

        let transcoding = match stream_type {
            Some(StreamType::Hls) => transcodings.iter().find(|t| t.format.as_ref().unwrap().protocol.as_ref().unwrap() == &StreamType::Hls),
            Some(StreamType::Progressive) => transcodings.iter().find(|t| t.format.as_ref().unwrap().protocol.as_ref().unwrap() == &StreamType::Progressive),
            _ => transcodings.iter().find(|t| t.format.as_ref().unwrap().protocol.as_ref().unwrap() == &StreamType::Hls),
        };
        if transcoding.is_none() {
            return Err("No available download options".into());
        }

        let output_path = match destination {
            Some(destination) => PathBuf::from(destination).join(format!("{}.mp3", title)),
            None => PathBuf::from(format!("{}.mp3", title)),
        };
        if let Some(parent) = output_path.parent() {
            if !parent.exists() {
                std::fs::create_dir_all(parent)?;
            }
        }

        let transcoding = transcoding.unwrap();
        match transcoding.format.as_ref().unwrap().protocol.as_ref() {
            Some(StreamType::Progressive) => self.download_progressive(&transcoding, &output_path).await?,
            Some(StreamType::Hls) => self.download_hls(&transcoding, &output_path).await?,
            _ => return Err("Invalid Stream Type".into()),
        }

        Ok(())
    }

    async fn download_progressive(&self, transcoding: &Transcoding, output_path: &PathBuf) -> Result<(), Box<dyn Error>> {
        let url = Self::get_stream_url(transcoding, &self.client_id).await?;
        let response = reqwest::get(&url).await?;
        let bytes = response.bytes().await?;
        tokio::fs::write(output_path, &bytes).await?;
        Ok(())
    }

    async fn download_hls(&self, transcoding: &Transcoding, output_path: &PathBuf) -> Result<(), Box<dyn Error>> {
        let url = Self::get_stream_url(transcoding, &self.client_id).await?;
        download::auto_download()?;
        
        let status = FfmpegCommand::new()
            .input(&url)
            .output(output_path.to_str().unwrap())
            .args(["-c", "copy"])
            .spawn()?
            .wait()?;

        if !status.success() {
            return Err("Download HLS Failed".into());
        }
        Ok(())
    }

    async fn get_stream_url(
        transcoding: &Transcoding,
        client_id: &str,
    ) -> Result<String, Box<dyn Error>> {
        let path = transcoding.url.as_ref().ok_or("Missing transcoding URL")?;
        let stream: Stream = Self::get_json(path, None, None::<&()>, client_id).await?;
        stream.url.ok_or("Missing resolved stream URL".into())
    }
}