use std::{collections::HashMap, ffi::OsStr, process::{Command, Stdio}, sync::{Arc, Mutex, MutexGuard}};
use xmpd_manifest::song::{Song, SourceType};


lazy_static::lazy_static!(
    static ref SONG_CACHE_DL: Arc<Mutex<SongCacheDl>> = Arc::default();
);

#[derive(Debug, Clone, Hash, PartialEq, PartialOrd, Eq, Ord)]
pub enum SongStatus {
    Downloading,
    Converting,
    Done
}

#[derive(Debug, Default, Clone)]
pub struct SongCacheDl {
    pub jobs: HashMap<uuid::Uuid, SongStatus>,
    pub current_jobs: usize,
}

impl SongCacheDl {
    pub fn get() -> crate::Result<MutexGuard<'static, Self>> {
        match SONG_CACHE_DL.lock() {
            Ok(v) => Ok(v),
            Err(e) => anyhow::bail!(format!("{e:?}"))
        }
    }
    pub fn is_job_list_full(&self) -> bool {
        self.current_jobs >= 5
    }

    pub fn download(&mut self, sid: uuid::Uuid, song: Song) -> crate::Result<()> {
        self.current_jobs += 1;
        let song_format = xmpd_settings::Settings::get().unwrap().tooling.song_format.clone();
        let tooling = xmpd_settings::Settings::get()?.tooling.clone();
        let mut song_cache_d = xmpd_cliargs::CLIARGS.cache_path();
        song_cache_d.push("songs");
        match song.source_type() {
            SourceType::Youtube |
            SourceType::Soundcloud => {
                let mut song_p = song_cache_d.clone();
                song_p.push(sid.to_string());
                let song_p = song_p.with_extension(&song_format);

                let mut dl_cmd = Command::new(&tooling.ytdlp_path);
                dl_cmd.arg(song.url().as_str());
                dl_cmd.args(["-x", "--audio-format", &song_format]);
                dl_cmd.arg("-o");
                dl_cmd.arg(&song_p);
                
                if xmpd_cliargs::CLIARGS.debug {
                    dl_cmd.stdout(Stdio::piped());
                    dl_cmd.stderr(Stdio::piped());
                } else {
                    dl_cmd.stdout(Stdio::null());
                    dl_cmd.stderr(Stdio::null());
                }
                let dl_child = dl_cmd.spawn()?;
                self.jobs.insert(sid, SongStatus::Downloading);
                std::thread::spawn(move || {
                    if let Ok(output) = dl_child.wait_with_output() {
                        for line in String::from_utf8(output.stdout).unwrap().lines() {
                            log::info!("CMD: {}", line);
                        }
                        for line in String::from_utf8(output.stderr).unwrap().lines() {
                            log::error!("CMD: {}", line);
                        }
                    }
                    let mut cache = SONG_CACHE_DL.lock().unwrap();
                    cache.jobs.insert(sid, SongStatus::Done);
                    cache.current_jobs -= 1;
                });
            }

            SourceType::Spotify => {
                // Spotdl doesnt have webm as a format so its fucking annoying, oh well
                let mut song_p = song_cache_d.clone();
                song_p.push(sid.to_string());
                song_p.push("{output-ext}");
                let mut dl_cmd = Command::new(&tooling.spotdl_path);
                dl_cmd.arg(song.url().as_str());
                dl_cmd.arg("--ffmpeg");
                dl_cmd.arg(&tooling.ffmpeg_path);
                dl_cmd.args(["--format", &song_format, "--output"]);
                dl_cmd.arg(&song_p);
                let arg_str = dl_cmd.get_args();
                let arg_str: Vec<_> = arg_str.collect();
                let arg_str = arg_str.join(OsStr::new(" ")).to_string_lossy().to_string();
                log::debug!("spotify cli: {} {}", tooling.spotdl_path, arg_str);
                if xmpd_cliargs::CLIARGS.debug {
                    dl_cmd.stdout(Stdio::piped());
                    dl_cmd.stderr(Stdio::piped());
                } else {
                    dl_cmd.stdout(Stdio::null());
                    dl_cmd.stderr(Stdio::null());
                }
                let child = dl_cmd.spawn()?;
                self.jobs.insert(sid, SongStatus::Downloading);
                std::thread::spawn(move || {
                    if let Ok(output) = child.wait_with_output() {
                        for line in String::from_utf8(output.stdout).unwrap().lines() {
                            log::info!("CMD: {}", line);
                        }
                        for line in String::from_utf8(output.stderr).unwrap().lines() {
                            log::error!("CMD: {}", line);
                        }
                    }
                    let mut from = song_p.clone();
                    from.pop();
                    from.push("{song_format}.{song_format}");

                    let mut to = song_p.clone();
                    to.pop();
                    to.set_extension(&song_format);
                    std::fs::copy(&from, &to).unwrap();
                    from.pop();
                    std::fs::remove_dir_all(from).unwrap();
                    let mut cache = SONG_CACHE_DL.lock().unwrap();
                    cache.jobs.insert(sid, SongStatus::Done);
                    cache.current_jobs -= 1;
                });
            }
            SourceType::HttpBare => {
                todo!() 
            }
            SourceType::Http7z => {
                todo!()
            }
            SourceType::HttpZip => {
                todo!()
            }
        }
        Ok(())
    }
}