#![feature(os_str_display)]

use tek_tui::*;
use tek_tui::tek_input::*;
use tek_tui::tek_output::*;
use crate::crossterm::event::{Event, KeyEvent, KeyCode, KeyModifiers, KeyEventState, KeyEventKind};
use clap::{arg, command, value_parser, ArgAction, Command};
use walkdir::WalkDir;
use std::sync::{Arc, RwLock};
use std::path::{Path, PathBuf};
use std::env::current_dir;

mod keys;
mod view;

type Usually<T> = std::result::Result<T, Box<dyn std::error::Error>>;
type Perhaps<T> = Usually<Option<T>>;

fn cli () -> clap::Command {
    command!()
        .arg(arg!([path] "Path to root directory").value_parser(value_parser!(PathBuf)))
}
struct Taggart {
    root:   PathBuf,
    paths:  Vec<Entry>,
    cursor: usize,
    offset: usize,
    column: usize,
    size:   Measure<TuiOut>,
}
#[derive(Ord, Eq, PartialEq, PartialOrd, Default)]
struct Entry {
    path:   PathBuf,
    is_dir: bool,
    is_mus: bool,
    is_img: bool,
    depth:  usize,
}

fn main () -> Usually<()> {
    let args  = cli().get_matches();
    let path  = args.get_one::<PathBuf>("path");
    let state = Arc::new(RwLock::new(Taggart::new(path)?));
    Tui::new()?.run(&state)
}

impl Taggart {
    fn new (root: Option<&impl AsRef<Path>>) -> Usually<Self> {
        let root = if let Some(root) = root {
            root.as_ref().into()
        } else {
            current_dir()?
        };
        let mut paths = vec![];
        for entry in WalkDir::new(&root)
            .into_iter()
            .filter_entry(|e|!e
                .file_name()
                .to_str()
                .map(|s|s.starts_with("."))
                .unwrap_or(false))
        {
            let entry = entry?;
            if entry.depth() == 0 {
                continue
            }
            let depth = entry.depth();
            let path  = entry.into_path();
            let (is_dir, is_mus, is_img) = if path.is_dir() {
                (true, false, false)
            } else {
                (false, false, false)
            };
            paths.push(Entry {
                path:   path.strip_prefix(&root)?.into(),
                is_dir: path.is_dir(),
                is_mus: false,
                is_img: false,
                depth
            });
        }
        paths.sort();
        Ok(Self {
            root,
            paths,
            cursor: 0,
            offset: 0,
            column: 0,
            size: Measure::new(),
        })
    }
}

//pub enum Entry {
    //Dir {
        //path: PathBuf,
        //name: OsString,
        //entries: Vec<Box<FileTree>>,
    //},
    //File {
        //path: PathBuf,
        //name: OsString,
    //}
//}

//impl Entry {
    //fn new (path: &impl AsRef<Path>) -> Usually<Self> {
        //let mut paths = vec![];
        //for entry in WalkDir::new(&root)
            //.into_iter()
            //.filter_entry(|e|!e
                //.file_name()
                //.to_str()
                //.map(|s|s.starts_with("."))
                //.unwrap_or(false))
        //{
            //let path = entry?.into_path().strip_prefix(&root)?.into();
            //paths.push(path);
        //}
        //paths.sort();
    //}
//}

//struct FileTree {
    //path: PathBuf,
    //name: OsString,
    //entries: Vec<Box<FileTree>>,
//}

//impl FileTree {

//}