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#![recursion_limit = "128"]

extern crate proc_macro;

use proc_macro::TokenStream;
use proc_macro2;
use quote::quote;
use syn::{parse_macro_input, DeriveInput};

mod interface_block;
mod interface_block_component;
mod repr_std140;
mod resources;
mod transform_feedback;
mod util;
mod vertex;

#[proc_macro_attribute]
pub fn repr_std140(args: TokenStream, input: TokenStream) -> TokenStream {
    assert!(args.is_empty(), "#[repr_std140] does not take arguments.");

    let input = parse_macro_input!(input as DeriveInput);

    repr_std140::expand_repr_std140(&input)
        .unwrap_or_else(compile_error)
        .into()
}

#[proc_macro_derive(InterfaceBlock, attributes(vertex_attribute))]
pub fn derive_interface_block(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);

    interface_block::expand_derive_interface_block(&input)
        .unwrap_or_else(compile_error)
        .into()
}

#[proc_macro_derive(InterfaceBlockComponent, attributes(vertex_attribute))]
pub fn derive_interface_block_component(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);

    interface_block_component::expand_derive_interface_block_component(&input)
        .unwrap_or_else(compile_error)
        .into()
}

#[proc_macro_derive(Resources, attributes(buffer_resource, texture_resource))]
pub fn derive_resources(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);

    resources::expand_derive_resources(&input)
        .unwrap_or_else(compile_error)
        .into()
}

#[proc_macro_derive(TransformFeedback)]
pub fn derive_transform_feedback(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);

    transform_feedback::expand_derive_transform_feedback(&input).into()
}

#[proc_macro_derive(Vertex, attributes(vertex_attribute))]
pub fn derive_vertex(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);

    vertex::expand_derive_vertex(&input)
        .unwrap_or_else(compile_error)
        .into()
}

fn compile_error(message: String) -> proc_macro2::TokenStream {
    quote! {
        compile_error!(#message);
    }
}