use star::{StarItem, StarIterator};
use std::env;
use std::fs::File;
use std::io::BufReader;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let args: Vec<String> = env::args().collect();
    if args.len() != 2 {
        eprintln!("Usage: star-debug <file.star>");
        std::process::exit(1);
    }

    let file = File::open(&args[1])?;
    let reader = BufReader::new(file);
    let iter = StarIterator::new(reader);

    let mut nodes = 0;
    let mut records = 0;

    for item in iter.iter_tree() {
        let item = item?;
        match item {
            StarItem::Commit(c) => {
                println!("Commit:");
                println!("  DID: {}", c.did);
                println!("  Rev: {}", c.rev);
                println!("  Root: {:?}", c.data);
            }
            StarItem::Node(_n) => {
                // print_node(&n);
                nodes += 1;
            }
            StarItem::Record { .. } => {
                // println!("  Record: key={}, cid={}", to_hex(&key), cid);
                records += 1;
            }
        }
    }

    println!("Tree contained {nodes} nodes, {records} records.");

    Ok(())
}

// fn print_node(node: &StarMstNode) {
//     println!("Node:");
//     if let Some(l) = node.l {
//         println!("  Left -> {}", l);
//     }
//     for (i, e) in node.e.iter().enumerate() {
//         print!("  Entry {}: key={}", i, to_hex(&e.k));
//         if let Some(v) = e.v {
//             print!(", val={}", v);
//         } else {
//             print!(", val=(implicit)");
//         }
//         if let Some(t) = e.t {
//             print!(", right->{}", t);
//         }
//         println!();
//     }
// }

// fn to_hex(bytes: &[u8]) -> String {
//     let mut s = String::with_capacity(bytes.len() * 2);
//     for b in bytes {
//         use std::fmt::Write;
//         write!(&mut s, "{:02x}", b).unwrap();
//     }
//     s
// }