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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;

use itertools::Itertools;

fn gen_field_from_bytes_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, "from_bytes")
?0
;

    if let Some(
header8
) = &field.header {

  Branch (47:12): [True: 8, False: 55]

  Branch (47:12): [True: 0, False: 0]

  Branch (47:12): [Folded - Ignored]

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

    }

    scope.var("type", msg_type);

    if field.header.is_some() && 
field.ty.is_union()8
 {

  Branch (51:8): [True: 8, False: 55]
  Branch (51:34): [True: 4, False: 4]

  Branch (51:8): [True: 0, False: 0]
  Branch (51:34): [True: 0, False: 0]

  Branch (51:8): [Folded - Ignored]
  Branch (51:34): [Folded - Ignored]

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

    } else if field.header.is_some() {

  Branch (53:15): [True: 4, False: 55]

  Branch (53:15): [True: 0, False: 0]

  Branch (53:15): [Folded - Ignored]

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

    } else if field.ty.is_message_reference() {

  Branch (55:15): [True: 4, False: 51]

  Branch (55:15): [True: 0, False: 0]

  Branch (55:15): [Folded - Ignored]

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

    } else {

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

    }

}

pub fn generate_from_bytes_impl<U: Utilities, T: TypeMapper>(

    msg: &Message,

    templates: &Templates,

    type_path_map: &TypePathMapper<T>,

    function: &str,

) -> Result<String, Error> {

    let fields = msg

        .fields

        .iter()

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

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

        .join("");

    let field_names = msg

        .fields

        .iter()

        .map(|field| templates.template.scope().var("name", &field.name).render(function, &["field_name"]).unwrap())

        .join("");

    Ok(templates

        .template

        .scope()

        .var("fields", fields)

        .var("field_names", field_names)

        .render("", &[function])

        .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);

    generate_from_bytes_impl::<U, T>(msg, &templates, type_path_map, function)

}