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use crate::compiler::message::{Field, Message};

use crate::compiler::util::types::TypeMapper;

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

use crate::gen::base::message::{Templates, Utilities};

use crate::gen::base::message_common::generate_field_type_inline;

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

fn gen_field_write_impl<U: Utilities, T: TypeMapper>(

    field: &Field,

    templates: &Templates,

    type_path_map: &TypePathMapper<T>,

    function: &str,

) -> Result<String, Error> {

    let mut scope = templates.template.scope();

    scope.var("name", &field.name);

    let codec_template = templates.get(field.codec())
?0
;

    let msg_type = generate_field_type_inline::<U, T>(field, codec_template, type_path_map, "write")
?0
;

    if let Some(
header13
) = &field.header {

  Branch (46:12): [True: 13, False: 53]

  Branch (46:12): [True: 0, False: 0]

  Branch (46:12): [Folded - Ignored]

        scope.var("header_name", &header.name);

    }

    scope.var("type", msg_type);

    if field.header.is_some() && 
field.ty.is_union()13
 {

  Branch (50:8): [True: 13, False: 53]
  Branch (50:34): [True: 9, False: 4]

  Branch (50:8): [True: 0, False: 0]
  Branch (50:34): [True: 0, False: 0]

  Branch (50:8): [Folded - Ignored]
  Branch (50:34): [Folded - Ignored]

        Ok(scope.render(function, &["field_union"]).unwrap())

    } else if field.header.is_some() {

  Branch (52:15): [True: 4, False: 53]

  Branch (52:15): [True: 0, False: 0]

  Branch (52:15): [Folded - Ignored]

        Ok(scope.render(function, &["field_header"]).unwrap())

    } else if field.ty.is_string() {

  Branch (54:15): [True: 18, False: 35]

  Branch (54:15): [True: 0, False: 0]

  Branch (54:15): [Folded - Ignored]

        Ok(scope.render(function, &["field_string"]).unwrap())

    } else {

        Ok(scope.render(function, &["field"]).unwrap())

    }

}

pub fn generate<'variable, U: Utilities, T: TypeMapper>(

    mut templates: Templates<'_, 'variable>,

    msg: &'variable Message,

    type_path_map: &TypePathMapper<T>,

    function: &str,

) -> Result<String, Error> {

    templates.template.var("msg_name", &msg.name);

    let fields = msg

        .fields

        .iter()

        .map(|field| gen_field_write_impl::<U, T>(field, &templates, type_path_map, function))

        .collect::<Result<Vec<String>, Error>>()
?0

        .join("");

    Ok(templates.template.var("fields", fields).render("", &[function]).unwrap())

}