// Copyright (c) 2024, BlockProject 3D

//

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//

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// are permitted provided that the following conditions are met:

//

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//       this list of conditions and the following disclaimer.

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//       this list of conditions and the following disclaimer in the documentation

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//       may be used to endorse or promote products derived from this software

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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

use crate::compiler::Protocol;

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

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

use crate::gen::file::{Content, File, FileType};

use crate::gen::rust::message::{

    gen_message_decl, gen_message_from_slice_impl, gen_message_offsets_decl, gen_message_write_impl,

};

use crate::gen::rust::params::Params;

use crate::gen::rust::r#enum::gen_enum_decl;

use crate::gen::rust::structure::gen_structure_decl;

use crate::gen::rust::union::gen_union_decl;

use crate::gen::Generator;

use bp3d_debug::trace;

use std::path::Path;

use crate::codec_map_initializer;

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

const TEMPLATE_CODEC_BASE: &[u8] = include_bytes!("./default_codec/base.template");

const TEMPLATE_CODEC_STRING: &[u8] = include_bytes!("./default_codec/string.template");

const TEMPLATE_CODEC_LIST: &[u8] = include_bytes!("./default_codec/list.template");

pub struct GeneratorRust;

impl Generator for GeneratorRust {

    type Error = Error;

    type Params<'a> = Params<'a>;

    fn get_default_codecs<'fragment, 'variable>() -> CodecMap<'fragment, 'variable> {

        let mut codecs = CodecMap::new(codec_map_initializer! {

            "base" => TEMPLATE_CODEC_BASE

        });

        codecs.insert("string", Template::compile_with_includes(TEMPLATE_CODEC_STRING, &codecs).unwrap());

        codecs.insert("list", Template::compile_with_includes(TEMPLATE_CODEC_LIST, &codecs).unwrap());

        codecs

    }

    fn generate(proto: &Protocol, codec_map: &CodecMap, params: &Params) -> Result<Vec<File>, Self::Error> {

        trace!({?params}, "Generating protocol {}", proto.full_name);

        let decl_messages_code =

            proto.messages.iter().map(|v| 
gen_message_decl(v, codec_map, &proto.type_path_map, params)28
);

        let impl_from_slice_messages_code =

            proto.messages.iter().map(|v| 
gen_message_from_slice_impl(v, codec_map, &proto.type_path_map)28
);

        let impl_write_messages_code =

            proto.messages.iter().map(|v| 
gen_message_write_impl(v, codec_map, &proto.type_path_map, params)28
);

        let decl_structures = proto.structs.iter().map(|v| gen_structure_decl(v, &proto.type_path_map, params));

        let decl_enums = proto.enums.iter().map(|v| 
gen_enum_decl(v)6
);

        let decl_unions = proto.unions.iter().map(|v| 
gen_union_decl(v, &proto.type_path_map, params)6
);

        let mut files = vec![

            File::new(

                FileType::Message,

                "messages.rs",

                &Content::try_from_iter(decl_messages_code)
?0
,

            ),

            File::new(

                FileType::MessageReading,

                "messages_from_bytes.rs",

                &Content::try_from_iter(impl_from_slice_messages_code)
?0
,

            ),

            File::new(

                FileType::MessageWriting,

                "messages_write.rs",

                &Content::try_from_iter(impl_write_messages_code)
?0
,

            ),

            File::new(

                FileType::Structure,

                "structures.rs",

                &Content::from_iter(decl_structures),

            ),

            File::new(FileType::Enum, "enums.rs", &Content::from_iter(decl_enums)),

            File::new(FileType::Union, "unions.rs", &Content::from_iter(decl_unions)),

        ];

        if params.enable_message_offsets {

  Branch (100:12): [True: 1, False: 34]
  Branch (100:12): [Folded - Ignored]

            let decl_messages_code_offsets =

                proto.messages.iter().map(|v| gen_message_offsets_decl(v, codec_map, &proto.type_path_map));

            files.push(File::new(

                FileType::MessageReading,

                "messages_offsets.rs",

                &Content::try_from_iter(decl_messages_code_offsets)
?0
,

            ));

        }

        Ok(files)

    }

    fn generate_umbrella<'a>(

        proto_name: &str,

        files: impl Iterator<Item = &'a Path>,

        _: &Params,

    ) -> Result<String, Self::Error> {

        let mut code = format!("pub mod {} {{\n", proto_name);

        for 
file89
 in files {

            code += &format!("include!({:?});\n", file);

        }

        code += "}\n";

        Ok(code)

    }

    fn get_language_extension() -> &'static str {

        "rs"

    }

}