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

use crate::compiler::Protocol;

use crate::gen::base::map::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::swift::util::{SwiftTypeMapper, SwiftUtils};

use crate::gen::template::{Options, Template};

use std::borrow::Cow;

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

pub fn gen_message_from_slice_impl(proto: &Protocol, codec_map: &CodecMap, msg: &Message) -> Result<String, Error> {

    let mut options = Options::default();

    options.functions_mut().add("remove_leading_coma", |v| Cow::Borrowed(&v[..v.len() - 2]));

    let mut templates = Templates {

        template: Template::compile_with_options(TEMPLATE, &options).unwrap(),

        codec_map,

    };

    templates.template.var("proto_name", proto.name());

    let type_path_map = TypePathMapper::new(&proto.type_path_map, SwiftTypeMapper::from_protocol(proto));

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

}