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/*
 * Copyright 2020 Fluence Labs Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

mod record_serializer;
mod record_deserializer;

use record_serializer::*;
use record_deserializer::*;

use crate::new_ident;
use crate::fce_ast_types;

impl quote::ToTokens for fce_ast_types::AstRecordItem {
    fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
        let original = &self.original;
        crate::prepare_global_data!(
            Record,
            self,
            self.name,
            data,
            data_size,
            global_static_name,
            section_name
        );
        let record_name = new_ident!(self.name);

        let serializer_fn = generate_serializer_fn(self);
        let deserializer_fn = generate_deserializer_fn(self);

        let glue_code = quote::quote! {
            #original

            // used_id_fce is a special feature that indicates that this struct will be used inside
            // FCE for some internal needs
            #[cfg(target_arch = "wasm32")]
            #[doc(hidden)]
            #[allow(clippy::all)]
            impl #record_name {
                #serializer_fn

                #deserializer_fn
            }

            #[cfg(target_arch = "wasm32")]
            #[doc(hidden)]
            #[allow(clippy::all)]
            #[link_section = #section_name]
            pub static #global_static_name: [u8; #data_size] = { *#data };
        };

        tokens.extend(glue_code);
    }
}

fn generate_serializer_fn(record: &fce_ast_types::AstRecordItem) -> proc_macro2::TokenStream {
    let serializer = record.generate_serializer();

    quote::quote! {
        pub fn __fce_generated_serialize(self) -> *const u8 {
            let mut raw_record: Vec<u64> = Vec::new();

            #serializer

            let raw_record_ptr = raw_record.as_ptr();
            std::mem::forget(raw_record);

            raw_record_ptr as _
        }
    }
}

fn generate_deserializer_fn(record: &fce_ast_types::AstRecordItem) -> proc_macro2::TokenStream {
    let RecordDeserializerDescriptor {
        deserializer,
        type_constructor,
    } = record.generate_deserializer();

    let record_size =
        crate::utils::get_record_size(record.fields.iter().map(|ast_field| &ast_field.ty));

    quote::quote! {
        pub unsafe fn __fce_generated_deserialize(record_ptr: *const u8) -> Self {
            let raw_record: Vec<u64> = Vec::from_raw_parts(record_ptr as _, #record_size, #record_size);

            #deserializer

            #type_constructor
        }
    }
}