use crate::*;
use std::path::PathBuf;
use std::ffi::OsString;

#[derive(Clone, Debug)]
pub enum BrowserTarget {
    SaveProject,
    LoadProject,
    ImportSample(Arc<RwLock<Option<Sample>>>),
    ExportSample(Arc<RwLock<Option<Sample>>>),
    ImportClip(Arc<RwLock<Option<MidiClip>>>),
    ExportClip(Arc<RwLock<Option<MidiClip>>>),
}

/// Browses for phrase to import/export
#[derive(Debug, Clone, Default)]
pub struct Browser {
    pub cwd:    PathBuf,
    pub dirs:   Vec<(OsString, String)>,
    pub files:  Vec<(OsString, String)>,
    pub filter: String,
    pub index:  usize,
    pub scroll: usize,
    pub size:   Measure<TuiOut>,
}

impl Browser {

    pub fn new (cwd: Option<PathBuf>) -> Usually<Self> {
        let cwd = if let Some(cwd) = cwd { cwd } else { std::env::current_dir()? };
        let mut dirs  = vec![];
        let mut files = vec![];
        for entry in std::fs::read_dir(&cwd)? {
            let entry   = entry?;
            let name    = entry.file_name();
            let decoded = name.clone().into_string().unwrap_or_else(|_|"<unreadable>".to_string());
            let meta    = entry.metadata()?;
            if meta.is_dir() {
                dirs.push((name, format!("📁 {decoded}")));
            } else if meta.is_file() {
                files.push((name, format!("📄 {decoded}")));
            }
        }
        Ok(Self {
            cwd,
            dirs,
            files,
            filter: "".to_string(),
            index:  0,
            scroll: 0,
            size:   Measure::new(),
        })
    }

    pub fn len (&self) -> usize {
        self.dirs.len() + self.files.len()
    }

    pub fn is_dir (&self) -> bool {
        self.index < self.dirs.len()
    }

    pub fn is_file (&self) -> bool {
        self.index >= self.dirs.len()
    }

    pub fn path (&self) -> PathBuf {
        self.cwd.join(if self.is_dir() {
            &self.dirs[self.index].0
        } else if self.is_file() {
            &self.files[self.index - self.dirs.len()].0
        } else {
            unreachable!()
        })
    }

    pub fn chdir (&self) -> Usually<Self> {
        Self::new(Some(self.path()))
    }

}