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use std::{collections::HashMap, path::Path, ptr::addr_of_mut};
use mlua::{Lua, UserData};
use once_cell::sync::Lazy;
use crate::lua::{ownedfunction::OwnedFunction, runnable::Runnable};
use self::native::csv::load_csv;
use super::{register::SheetId, tablized::Tablized};
pub mod native;
#[derive(Default)]
pub struct Loader {
loaders: HashMap<String, Box<dyn Runnable<String, Tablized>>>,
}
impl Loader {
pub fn new() -> Self {
let mut loaders: HashMap<String, Box<dyn Runnable<String, Tablized>>> = HashMap::new();
loaders.insert("csv".to_string(), Box::new(load_csv));
Self { loaders }
}
pub fn load_sheet(&self, path: String, lua: &Lua) -> Option<SheetId> {
let p = Path::new(&path);
if p.is_file() {
let loader = self.loaders.get(p.extension()?.to_str()?)?;
return match loader.run(path, lua) {
Ok(table) => table.to_sheet(lua).ok(),
Err(_) => None,
};
}
None
}
pub fn add(&mut self, extension: String, func: Box<dyn Runnable<String, Tablized>>) {
self.loaders.insert(extension, func);
}
pub fn get() -> &'static mut Self {
static mut GLOBAL_LOADER: Lazy<Loader> = Lazy::new(Loader::new);
unsafe { &mut *addr_of_mut!(GLOBAL_LOADER) }
}
}
impl UserData for Loader {
fn add_methods<'lua, M: mlua::prelude::LuaUserDataMethods<'lua, Self>>(methods: &mut M) {
methods.add_function("add", |_, (extension, func): (String, OwnedFunction)| {
Loader::get().add(extension, Box::new(func));
Ok(())
});
}
}
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