use mysql_common::frunk::{hlist_pat, HList};
use struct_field_names_as_array::FieldNamesAsArray;

#[allow(non_snake_case)]
#[derive(Debug, PartialEq, FieldNamesAsArray)]
pub struct Nutrition {
    id: i32,
    name: String,
    manufacturer: String,
    barcode: String,
    amount: i32,
    divisor: i32,
    kJ: f32,
    kcal: f32,
    saturated_fat: f32,
    carbohydrate: f32,
    sugar: f32,
    fibres: f32,
    protein: f32,
    salt: f32,
    vitamin_b2: f32,
    vitamin_b12: f32,
    calcium: f32,
    phosphor: f32,
}

type RowType = HList!(
    i32,
    Option<String>,
    Option<String>,
    Option<String>,
    Option<i32>,
    Option<i32>,
    Option<f32>,
    Option<f32>,
    Option<f32>,
    Option<f32>,
    Option<f32>,
    Option<f32>,
    Option<f32>,
    Option<f32>,
    Option<f32>,
    Option<f32>,
    Option<f32>,
    Option<f32>,
);

impl Nutrition {
    fn get_sql_fields() -> String {
        Nutrition::FIELD_NAMES_AS_ARRAY
            .iter()
            .cloned()
            .intersperse(", ")
            .collect()
    }

    pub fn query_map_helper() -> (String, impl Fn(RowType) -> Nutrition) {
        let sql_query = format!("SELECT {} from nutrition", Self::get_sql_fields());

        let construction_closure = |row: RowType| {
            let hlist_pat![
                id,
                name,
                manufacturer,
                barcode,
                amount,
                divisor,
                k_j,
                kcal,
                saturated_fat,
                carbohydrate,
                sugar,
                fibres,
                protein,
                salt,
                vitamin_b2,
                vitamin_b12,
                calcium,
                phosphor
            ] = row;
            Nutrition {
                id,
                name: name.unwrap_or("".to_string()),
                manufacturer: manufacturer.unwrap_or("".to_string()),
                barcode: barcode.unwrap_or("".to_string()),
                amount: amount.unwrap_or(0),
                divisor: divisor.unwrap_or(0),
                kJ: k_j.unwrap_or(0.),
                kcal: kcal.unwrap_or(0.),
                saturated_fat: saturated_fat.unwrap_or(0.),
                carbohydrate: carbohydrate.unwrap_or(0.),
                sugar: sugar.unwrap_or(0.),
                fibres: fibres.unwrap_or(0.),
                protein: protein.unwrap_or(0.),
                salt: salt.unwrap_or(0.),
                vitamin_b2: vitamin_b2.unwrap_or(0.),
                vitamin_b12: vitamin_b12.unwrap_or(0.),
                calcium: calcium.unwrap_or(0.),
                phosphor: phosphor.unwrap_or(0.),
            }
        };

        (sql_query, construction_closure)
    }
}