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mod common;
mod connect_gen;
mod hdl_gen;
mod logic_block;
mod logic_interface;
mod logic_state;
mod logic_struct;

use syn::parse_macro_input;
use syn::DeriveInput;

use crate::common::TS;
use crate::connect_gen::connect_gen;
use crate::hdl_gen::hdl_gen_process;
use crate::logic_block::get_impl_for_logic_block;
use crate::logic_interface::get_impl_for_logic_interface;
use crate::logic_state::get_logic_state_impls;
use crate::logic_struct::get_impl_for_logic_struct;
use proc_macro::TokenStream;
use quote::quote;

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

    match get_impl_for_logic_block(&input) {
        Err(e) => e.to_compile_error().into(),
        Ok(x) => x.into(),
    }
}

#[proc_macro_derive(LogicInterface, attributes(join))]
pub fn logic_interface(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);

    match get_impl_for_logic_interface(&input) {
        Err(e) => e.to_compile_error().into(),
        Ok(x) => x.into(),
    }
}

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

    match get_logic_state_impls(&input) {
        Err(e) => e.to_compile_error().into(),
        Ok(x) => x.into(),
    }
}

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

    match get_impl_for_logic_struct(&input) {
        Err(e) => e.to_compile_error().into(),
        Ok(x) => x.into(),
    }
}

#[proc_macro_attribute]
pub fn hdl_gen(_attr: TokenStream, item: TokenStream) -> TokenStream {
    let orig = TS::from(item.clone());
    let parse = parse_macro_input!(item as syn::ItemFn);
    let connects = match connect_gen(&parse) {
        Err(e) => return e.to_compile_error().into(),
        Ok(t) => t,
    };
    match hdl_gen_process(parse) {
        Err(e) => e.to_compile_error().into(),
        Ok(hdl_code) => TokenStream::from(quote! {
        #[allow(unreachable_patterns)]
            #orig

        #[allow(dead_code)]
        #[allow(unused_variables)]
        #[automatically_derived]
            #connects

        #[allow(dead_code)]
        #[allow(unused_variables)]
        #[automatically_derived]
            #hdl_code
        }),
    }
}