use crate::*;

pub struct AddSampleModal {
    exited:  bool,
    dir:     PathBuf,
    subdirs: Vec<OsString>,
    files:   Vec<OsString>,
    cursor:  usize,
    offset:  usize,
    sample:  Arc<RwLock<Sample>>,
    voices:  Arc<RwLock<Vec<Voice>>>,
    _search: Option<String>,
}

impl AddSampleModal {
    fn exited (&self) -> bool {
        self.exited
    }
    fn exit (&mut self) {
        self.exited = true
    }
}

impl AddSampleModal {
    pub fn new (
        sample: &Arc<RwLock<Sample>>,
        voices: &Arc<RwLock<Vec<Voice>>>
    ) -> Usually<Self> {
        let dir = std::env::current_dir()?;
        let (subdirs, files) = scan(&dir)?;
        Ok(Self {
            exited: false,
            dir,
            subdirs,
            files,
            cursor: 0,
            offset: 0,
            sample: sample.clone(),
            voices: voices.clone(),
            _search: None
        })
    }
    fn rescan (&mut self) -> Usually<()> {
        scan(&self.dir).map(|(subdirs, files)|{
            self.subdirs = subdirs;
            self.files = files;
        })
    }
    fn prev (&mut self) {
        self.cursor = self.cursor.saturating_sub(1);
    }
    fn next (&mut self) {
        self.cursor = self.cursor + 1;
    }
    fn try_preview (&mut self) -> Usually<()> {
        if let Some(path) = self.cursor_file() {
            if let Ok(sample) = Sample::from_file(&path) {
                *self.sample.write().unwrap() = sample;
                self.voices.write().unwrap().push(
                    Sample::play(&self.sample, 0, &u7::from(100u8))
                );
            }
            //load_sample(&path)?;
            //let src = std::fs::File::open(&path)?;
            //let mss = MediaSourceStream::new(Box::new(src), Default::default());
            //let mut hint = Hint::new();
            //if let Some(ext) = path.extension() {
                //hint.with_extension(&ext.to_string_lossy());
            //}
            //let meta_opts: MetadataOptions = Default::default();
            //let fmt_opts: FormatOptions = Default::default();
            //if let Ok(mut probed) =  symphonia::default::get_probe()
                //.format(&hint, mss, &fmt_opts, &meta_opts)
            //{
                //panic!("{:?}", probed.format.metadata());
            //};
        }
        Ok(())
    }
    fn cursor_dir (&self) -> Option<PathBuf> {
        if self.cursor < self.subdirs.len() {
            Some(self.dir.join(&self.subdirs[self.cursor]))
        } else {
            None
        }
    }
    fn cursor_file (&self) -> Option<PathBuf> {
        if self.cursor < self.subdirs.len() {
            return None
        }
        let index = self.cursor.saturating_sub(self.subdirs.len());
        if index < self.files.len() {
            Some(self.dir.join(&self.files[index]))
        } else {
            None
        }
    }
    fn pick (&mut self) -> Usually<bool> {
        if self.cursor == 0 {
            if let Some(parent) = self.dir.parent() {
                self.dir = parent.into();
                self.rescan()?;
                self.cursor = 0;
                return Ok(false)
            }
        }
        if let Some(dir) = self.cursor_dir() {
            self.dir = dir;
            self.rescan()?;
            self.cursor = 0;
            return Ok(false)
        }
        if let Some(path) = self.cursor_file() {
            let (end, channels) = read_sample_data(&path.to_string_lossy())?;
            let mut sample = self.sample.write().unwrap();
            sample.name = path.file_name().unwrap().to_string_lossy().into();
            sample.end = end;
            sample.channels = channels;
            return Ok(true)
        }
        return Ok(false)
    }
}

fn read_sample_data (_: &str) -> Usually<(usize, Vec<Vec<f32>>)> {
    todo!();
}

fn scan (dir: &PathBuf) -> Usually<(Vec<OsString>, Vec<OsString>)> {
    let (mut subdirs, mut files) = std::fs::read_dir(dir)?
        .fold((vec!["..".into()], vec![]), |(mut subdirs, mut files), entry|{
            let entry = entry.expect("failed to read drectory entry");
            let meta = entry.metadata().expect("failed to read entry metadata");
            if meta.is_file() {
                files.push(entry.file_name());
            } else if meta.is_dir() {
                subdirs.push(entry.file_name());
            }
            (subdirs, files)
        });
    subdirs.sort();
    files.sort();
    Ok((subdirs, files))
}

impl Content<TuiOut> for AddSampleModal {
    fn render (&self, to: &mut TuiOut) {
        todo!()
        //let area = to.area();
        //to.make_dim();
        //let area = center_box(
            //area,
            //64.max(area.w().saturating_sub(8)),
            //20.max(area.w().saturating_sub(8)),
        //);
        //to.fill_fg(area, Color::Reset);
        //to.fill_bg(area, Nord::bg_lo(true, true));
        //to.fill_char(area, ' ');
        //to.blit(&format!("{}", &self.dir.to_string_lossy()), area.x()+2, area.y()+1, Some(Style::default().bold()))?;
        //to.blit(&"Select sample:", area.x()+2, area.y()+2, Some(Style::default().bold()))?;
        //for (i, (is_dir, name)) in self.subdirs.iter()
            //.map(|path|(true, path))
            //.chain(self.files.iter().map(|path|(false, path)))
            //.enumerate()
            //.skip(self.offset)
        //{
            //if i >= area.h() as usize - 4 {
                //break
            //}
            //let t = if is_dir { "" } else { "" };
            //let line = format!("{t} {}", name.to_string_lossy());
            //let line = &line[..line.len().min(area.w() as usize - 4)];
            //to.blit(&line, area.x() + 2, area.y() + 3 + i as u16, Some(if i == self.cursor {
                //Style::default().green()
            //} else {
                //Style::default().white()
            //}))?;
        //}
        //Lozenge(Style::default()).draw(to)
    }
}