//! Storefront display-currency switcher.
//!
//! Sets the `currency` cookie to the buyer's chosen display currency, then sends
//! them back where they were. EUR is the base; any other code must name an
//! enabled row in `currencies` or it falls back to EUR on the next render.

use axum::{
    http::{header, HeaderMap},
    response::Redirect,
};
use loco_rs::prelude::*;
use serde::Deserialize;

use crate::controllers::i18n::back_path;
use crate::shared::currency::{BASE_CODE, COOKIE};

#[derive(Debug, Deserialize)]
pub struct CurrencyForm {
    pub currency: String,
}

#[debug_handler]
async fn set_currency(headers: HeaderMap, Form(form): Form<CurrencyForm>) -> Result<Response> {
    // Store the code uppercased; validation against the enabled set happens at
    // render time (shared::currency::resolve), which falls back to EUR.
    let code = form.currency.trim().to_uppercase();
    let code = if code.is_empty() { BASE_CODE.to_string() } else { code };
    let cookie = format!("{COOKIE}={code}; Path=/; Max-Age=31536000; SameSite=Lax");

    Ok((
        [(header::SET_COOKIE, cookie)],
        Redirect::to(&back_path(&headers)),
    )
        .into_response())
}

pub fn routes() -> Routes {
    Routes::new().add("/currency", post(set_currency))
}