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

use binread::{BinRead, BinReaderExt, BinResult, ReadOptions};

#[cfg(feature = "derive_serde")]
use serde::{Deserialize, Serialize};

#[cfg_attr(feature = "derive_serde", derive(Serialize, Deserialize))]
#[derive(BinRead, Debug)]
pub struct MeshItem {
    pub mesh_index: i32,
    /// The byte offset for the start of the indices for this [MeshItem] in [buffer](struct.Adj.html#structfield.buffer).
    /// The element count is calculated as the number of [i16] between the current offset and the offset of the next [MeshItem].
    pub buffer_offset: u32,
}

/// Mesh adjacency data for model.adjb files.
#[cfg_attr(feature = "derive_serde", derive(Serialize, Deserialize))]
#[derive(BinRead, Debug)]
pub struct Adj {
    pub count: u32,
    #[br(count = count)]
    pub items: Vec<MeshItem>,
    /// A shared buffer of indices for [items](#structfield.items)
    #[br(parse_with = read_to_end)]
    pub buffer: Vec<i16>,
}

fn read_to_end<R: Read + Seek>(reader: &mut R, _ro: &ReadOptions, _: ()) -> BinResult<Vec<i16>> {
    let mut buf = Vec::new();
    while let Ok(v) = reader.read_le::<i16>() {
        buf.push(v);
    }
    Ok(buf)
}