// Copyright 2019-2026 Dijital Kurdistan Tech Institute
// This file is dual-licensed as Apache-2.0 or GPL-3.0.
// see LICENSE for license details.

use pezkuwi_subxt_metadata::PalletMetadata;
use proc_macro2::TokenStream as TokenStream2;
use quote::quote;
use scale_typegen::TypeGenerator;

use super::CodegenError;
use scale_typegen::typegen::ir::ToTokensWithSettings;

/// Generate error type alias from the provided pallet metadata.
pub fn generate_error_type_alias(
	type_gen: &TypeGenerator,
	pallet: &PalletMetadata,
) -> Result<TokenStream2, CodegenError> {
	let Some(error_ty) = pallet.error_ty_id() else {
		return Ok(quote!());
	};

	let error_type = type_gen.resolve_type_path(error_ty)?.to_token_stream(type_gen.settings());
	let error_ty = type_gen.resolve_type(error_ty)?;
	let docs = &error_ty.docs;
	let docs = type_gen
		.settings()
		.should_gen_docs
		.then_some(quote! { #( #[doc = #docs ] )* })
		.unwrap_or_default();
	Ok(quote! {
		#docs
		pub type Error = #error_type;
	})
}