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extern crate proc_macro;

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

#[proc_macro_derive(DslVariable)]
pub fn derive_variable(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);
    let name = input.ident; // Struct name

    let gen = match input.data {
        Data::Struct(data) => match data.fields {
            Fields::Named(fields) => {
                let fields_init = fields.named.iter().map(|f| {
                    let fname = &f.ident;
                    let ftype = &f.ty;
                    let ftype_str = quote! { #ftype }.to_string();
                    if ftype_str.contains("Array") {
                        quote! {
                            #fname: Array::Dyn(builder.uninit(), builder.uninit()),
                        }
                    } else {
                        quote! {
                            #fname: <#ftype as Variable<C>>::uninit(builder),
                        }
                    }
                });

                let fields_assign = fields.named.iter().map(|f| {
                    let fname = &f.ident;
                    quote! {
                        self.#fname.assign(src.#fname.into(), builder);
                    }
                });

                let fields_assert_eq = fields.named.iter().map(|f| {
                    let fname = &f.ident;
                    let ftype = &f.ty;
                    quote! {
                        <#ftype as Variable<C>>::assert_eq(lhs.#fname, rhs.#fname, builder);
                    }
                });

                let fields_assert_ne = fields.named.iter().map(|f| {
                    let fname = &f.ident;
                    let ftype = &f.ty;
                    quote! {
                        <#ftype as Variable<C>>::assert_ne(lhs.#fname, rhs.#fname, builder);
                    }
                });

                let field_sizes = fields.named.iter().map(|f| {
                    let ftype = &f.ty;
                    quote! {
                        <#ftype as MemVariable<C>>::size_of()
                    }
                });

                let field_loads = fields.named.iter().map(|f| {
                    let fname = &f.ident;
                    let ftype = &f.ty;
                    quote! {
                        {
                            // let address = builder.eval(ptr + Usize::Const(offset));
                            self.#fname.load(ptr, index, builder);
                            index.offset += <#ftype as MemVariable<C>>::size_of();
                        }
                    }
                });

                let field_stores = fields.named.iter().map(|f| {
                    let fname = &f.ident;
                    let ftype = &f.ty;
                    quote! {
                        {
                            // let address = builder.eval(ptr + Usize::Const(offset));
                            self.#fname.store(ptr, index, builder);
                            index.offset += <#ftype as MemVariable<C>>::size_of();
                        }
                    }
                });

                quote! {
                    impl<C: Config> Variable<C> for #name<C> {
                        type Expression = Self;

                        fn uninit(builder: &mut Builder<C>) -> Self {
                            Self {
                                #(#fields_init)*
                            }
                        }

                        fn assign(&self, src: Self::Expression, builder: &mut Builder<C>) {
                            #(#fields_assign)*
                        }

                        fn assert_eq(
                            lhs: impl Into<Self::Expression>,
                            rhs: impl Into<Self::Expression>,
                            builder: &mut Builder<C>,
                        ) {
                            let lhs = lhs.into();
                            let rhs = rhs.into();
                            #(#fields_assert_eq)*
                        }

                        fn assert_ne(
                            lhs: impl Into<Self::Expression>,
                            rhs: impl Into<Self::Expression>,
                            builder: &mut Builder<C>,
                        ) {
                            let lhs = lhs.into();
                            let rhs = rhs.into();
                            #(#fields_assert_ne)*
                        }
                    }

                    impl<C: Config> MemVariable<C> for #name<C> {
                        fn size_of() -> usize {
                            let mut size = 0;
                            #(size += #field_sizes;)*
                            size
                        }

                        fn load(&self, ptr: Ptr<<C as Config>::N>,
                            index: MemIndex<<C as Config>::N>,
                            builder: &mut Builder<C>) {
                            let mut index = index;
                            #(#field_loads)*
                        }

                        fn store(&self, ptr: Ptr<<C as Config>::N>,
                                 index: MemIndex<<C as Config>::N>,
                                builder: &mut Builder<C>) {
                            let mut index = index;
                            #(#field_stores)*
                        }
                    }
                }
            }
            _ => unimplemented!(),
        },
        _ => unimplemented!(),
    };

    gen.into()
}