#![feature(array_chunks)]
use glam::Vec3;
use std::{
    env::args,
    fs::{File, create_dir_all},
    io::{BufReader, BufWriter, Write},
};
use unity_tools::{
    assetbundle::AssetBundle,
    classes::mesh::{Mesh, VertexDataChannel},
};

fn main() -> anyhow::Result<()> {
    env_logger::init_from_env("LOG");
    let file = BufReader::new(File::open(args().nth(1).unwrap()).unwrap());
    let mut bundle = AssetBundle::open(file)?;

    let mut i = 0;
    create_dir_all("/tmp/a").unwrap();

    for ob in bundle.all_toplevel_of_class("Mesh").collect::<Vec<_>>() {
        let mesh = ob.load(&mut bundle)?.parse::<Mesh>()?;
        let mut obj = BufWriter::new(File::create(format!(
            "/tmp/a/{}_{i}.obj",
            mesh.name.replace("/", "-").replace(".", "-")
        ))?);

        let positions = mesh
            .vertex_data
            .read_channel_vec::<Vec3>(VertexDataChannel::Position, false)?
            .unwrap();
        for Vec3 { x, y, z } in positions {
            writeln!(obj, "v {x} {y} {z}")?;
        }
        for [a, b, c] in mesh.read_indecies() {
            writeln!(obj, "f {} {} {}", a + 1, b + 1, c + 1)?;
        }
        i += 1;
    }

    Ok(())
}