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use super::atom_info::{AtomIdent, AtomInfo};
use super::read::skip_unneeded;
use crate::error::Result;

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

pub(crate) struct Trak {
	pub(crate) mdia: Option<AtomInfo>,
}

impl Trak {
	pub(crate) fn parse<R>(data: &mut R, trak: &AtomInfo) -> Result<Self>
	where
		R: Read + Seek,
	{
		let mut mdia = None;

		let mut read = 8;

		while read < trak.len {
			let atom = AtomInfo::read(data)?;

			if atom.ident == AtomIdent::Fourcc(*b"mdia") {
				mdia = Some(atom);
				data.seek(SeekFrom::Current((trak.len - read - 8) as i64))?;
				break;
			}

			skip_unneeded(data, atom.extended, atom.len)?;
			read += atom.len;
		}

		Ok(Self { mdia })
	}
}