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use crate::compiler::message::Message;

use crate::compiler::util::types::TypePathMap;

use crate::gen::base::map::{DefaultTypeMapper, TypePathMapper};

use crate::gen::base::message::Templates;

use crate::gen::base::message_from_bytes::generate;

use crate::gen::base::Error;

use crate::gen::codec::CodecMap;

use crate::gen::rust::util::{gen_where_clause, RustUtils};

use crate::gen::template::Template;

use itertools::Itertools;

const TEMPLATE: &[u8] = include_bytes!("from_bytes.template");

pub fn gen_message_from_slice_impl(

    msg: &Message,

    codec_map: &CodecMap,

    type_path_map: &TypePathMap,

) -> Result<String, Error> {

    let type_path_map = TypePathMapper::new(type_path_map, DefaultTypeMapper);

    let mut templates = Templates {

        template: Template::compile(TEMPLATE).unwrap(),

        codec_map,

    };

    let where_clauses = msg

        .fields

        .iter()

        .map(|field| gen_where_clause(&templates.template, field, &type_path_map, "impl"))

        .join("");

    templates

        .template

        .var("generics", RustUtils::get_generics(msg, &type_path_map).to_string())

        .var("where_clauses", where_clauses);

    generate::<RustUtils, _>(templates, msg, &type_path_map, "impl")

}