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use crate::compiler::union::{DiscriminantField, Union};

use crate::compiler::Protocol;

use crate::gen::base::map::TypePathMapper;

use crate::gen::base::union::{generate, Utilities};

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

use crate::gen::template::hook::TemplateHooks;

use crate::gen::template::util::CaseConversion;

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

use itertools::Itertools;

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

impl Utilities for SwiftUtils {

    fn gen_discriminant_path(discriminant: &DiscriminantField) -> String {

        discriminant

            .iter()

            .map(|(f, is_leaf)| {

                if is_leaf {

  Branch (46:20): [True: 0, False: 0]

  Branch (46:20): [Folded - Ignored]

                    format!("raw.{}", f.name.to_camel_case())

                } else {

                    format!("{}", f.name.to_camel_case())

                }

            })

            .join(".")

    }

    fn gen_discriminant_path_mut(discriminant: &DiscriminantField) -> String {

        discriminant

            .iter()

            .map(|(f, is_leaf)| {

                if is_leaf {

  Branch (59:20): [True: 0, False: 0]

  Branch (59:20): [Folded - Ignored]

                    format!("raw.set{}", f.name.to_pascal_case())

                } else {

                    format!("{}", f.name.to_camel_case())

                }

            })

            .join(".")

    }

}

pub fn gen_union_decl(proto: &Protocol, u: &Union) -> String {

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

    let mut template = Template::compile(TEMPLATE).unwrap();

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

    generate::<SwiftUtils, _>(template, u, &type_path_map, &TemplateHooks::default())

}