use mlua::IntoLua;

#[derive(Clone,Copy)]
pub struct Enum(u32);
pub struct EnumItems;
pub struct EnumItem{
	name:String
}

impl Into<rbx_types::Enum> for Enum{
	fn into(self)->rbx_types::Enum{
		rbx_types::Enum::from_u32(self.0)
	}
}

impl EnumItem{
	const fn new(name:String)->Self{
		Self{name}
	}
}

pub fn set_globals(_lua:&mlua::Lua,globals:&mlua::Table<'_>)->Result<(),mlua::Error>{
	globals.set("Enum",EnumItems)
}

impl mlua::UserData for EnumItem{
	fn add_fields<'lua,F:mlua::UserDataFields<'lua,Self>>(_fields:&mut F){
	}
	fn add_methods<'lua,M:mlua::UserDataMethods<'lua,Self>>(methods:&mut M){
		methods.add_meta_function(mlua::MetaMethod::Index,|lua,(this,val):(Self,String)|{
			let db=rbx_reflection_database::get();
			match db.enums.get(this.name.as_str()){
				Some(e)=>match e.items.get(val.as_str()){
					Some(&id)=>Enum(id).into_lua(lua),
					None=>mlua::Value::Nil.into_lua(lua),
				},
				None=>mlua::Value::Nil.into_lua(lua),
			}
		});
	}
}
impl<'lua> mlua::FromLua<'lua> for EnumItem{
	fn from_lua(value:mlua::prelude::LuaValue<'lua>,_lua:&'lua mlua::prelude::Lua)->mlua::prelude::LuaResult<Self>{
		match value{
			mlua::Value::UserData(ud)=>ud.take()?,
			other=>Err(mlua::Error::runtime(format!("Expected Enum got {:?}",other))),
		}
	}
}

impl mlua::UserData for EnumItems{
	fn add_fields<'lua,F:mlua::UserDataFields<'lua,Self>>(_fields:&mut F){
	}
	fn add_methods<'lua,M:mlua::UserDataMethods<'lua,Self>>(methods:&mut M){
		methods.add_meta_function(mlua::MetaMethod::Index,|lua,(_,val):(Self,String)|{
			let db=rbx_reflection_database::get();
			match db.enums.get(val.as_str()){
				Some(_)=>EnumItem::new(val).into_lua(lua),
				None=>mlua::Value::Nil.into_lua(lua),
			}
		});
	}
}
impl<'lua> mlua::FromLua<'lua> for EnumItems{
	fn from_lua(value:mlua::prelude::LuaValue<'lua>,_lua:&'lua mlua::prelude::Lua)->mlua::prelude::LuaResult<Self>{
		match value{
			mlua::Value::UserData(ud)=>ud.take()?,
			other=>Err(mlua::Error::runtime(format!("Expected Enum got {:?}",other))),
		}
	}
}

impl mlua::UserData for Enum{
	fn add_fields<'lua,F:mlua::UserDataFields<'lua,Self>>(_fields:&mut F){
	}
	fn add_methods<'lua,M:mlua::UserDataMethods<'lua,Self>>(_methods:&mut M){
	}
}
impl<'lua> mlua::FromLua<'lua> for Enum{
	fn from_lua(value:mlua::prelude::LuaValue<'lua>,_lua:&'lua mlua::prelude::Lua)->mlua::prelude::LuaResult<Self>{
		match value{
			mlua::Value::UserData(ud)=>ud.take()?,
			other=>Err(mlua::Error::runtime(format!("Expected Enum got {:?}",other))),
		}
	}
}