use std::io::{Cursor, Read};

use sqpack::binrw::BinRead;
use sqpack::binrw::meta::ReadEndian;

use crate::error::{Error, Result};

pub const MAX_MODEL_LODS: usize = 3;
pub const MAX_TEXTURE_LODS: usize = 3;

pub fn read_struct<S: BinRead + ReadEndian, T: Read>(mut reader: T, buf: &mut [u8]) -> Result<S>
    where S::Args: Default,
{
    let size = std::mem::size_of::<S>();
    if size > buf.len() {
        panic!();
    }

    reader.read_exact(&mut buf[..size]).map_err(Error::Io)?;
    S::read(&mut Cursor::new(&buf[..size]))
        .map_err(Error::SqPackError)
}