use std::io::Read;
use std::collections::HashMap;
use crate::texture_loader::{Texture,Textures};
use strafesnet_common::model::TextureId;

pub struct TextureLoader{
	texture_names:HashMap<String,TextureId>,
}
impl TextureLoader{
	pub fn new()->Self{
		Self{
			texture_names:HashMap::new(),
		}
	}
}

impl crate::texture_loader::TextureLoaderTrait for TextureLoader{
	type Error=std::io::Error;
	fn acquire_id(&mut self,name:&str)->TextureId{
		let texture_id=TextureId::new(self.texture_names.len() as u32);
		*self.texture_names.entry(name.to_owned()).or_insert(texture_id)
	}
	fn load(&self)->Result<Textures,Self::Error>{
		let mut texture_data=vec![Vec::<u8>::new();self.texture_names.len()];
		for (texture_name,texture_id) in &self.texture_names{
			let path=std::path::PathBuf::from(format!("textures/{}.dds",texture_name.as_str()));
			if let Ok(mut file)=std::fs::File::open(path){
				//TODO: parallel
				file.read_to_end(texture_data.get_mut(texture_id.get() as usize).unwrap())?;
			}
		}
		Ok(Textures::new(texture_data.into_iter().map(Texture::ImageDDS).collect()))
	}
}