use alloc::{
    format,
    string::{String, ToString},
    vec::Vec,
};
use ext2::{
    fs::{
        sync::{Inode, Synced},
        Ext2,
    },
    sector::{SectorSize, Size1024},
    volume::Volume,
};

/// Experimental scratchpad for testing.
pub fn scratchpad() {
    let mut fs = load_fs();

    let root = fs.root_inode();
    walk(&fs, fs.root_inode(), String::new());
}

fn load_fs() -> Synced<Ext2<Size1024, Vec<u8>>> {
    let file = include_bytes!("../../userland/root_rs/ext2.img");

    let mut volume = Vec::new();
    volume.extend_from_slice(file);

    let fs = Synced::<Ext2<Size1024, _>>::new(volume);
    assert!(
        fs.is_ok(),
        "Err({:?})",
        fs.err().unwrap_or_else(|| unreachable!()),
    );

    let fs = fs.unwrap();

    fs
}

use genfs::{DirOptions, Fs, OpenOptions};
use serde::__private::from_utf8_lossy;

use crate::{arch::drivers::serial, serial_println};

fn walk<'vol, S: SectorSize, V: Volume<u8, S>>(
    fs: &'vol Synced<Ext2<S, V>>,
    inode: Inode<S, V>,
    name: String,
) {
    inode.directory().map(|dir| {
        for entry in dir {
            assert!(entry.is_ok());
            let entry = entry.unwrap();
            let entry_name = from_utf8_lossy(&entry.name);

            println!("{}/{} => {}", name, entry_name, entry.inode,);
            if entry_name != "." && entry_name != ".." {
                walk(
                    fs,
                    fs.inode_nth(entry.inode).unwrap(),
                    format!("{}/{}", name, entry_name),
                );
            }
        }
    });
}