use std::{cell::Cell, str::from_utf8};

use macroconf::config;
use miniconf::JsonCoreSlash;

fn set_cell<const MIN: i32, const MAX: i32>(
    cell: &Cell<i32>,
    val: i32,
) -> Result<(), &'static str> {
    if (MIN..=MAX).contains(&val) {
        cell.set(val);
        Ok(())
    } else {
        Err("value out of bounds")
    }
}

#[config]
struct Config {
    #[config(
        min = "-128",
        max = "128",
        default,
        typ = "i32",
        get = "Cell::get",
        set = "set_cell::<-128,128>"
    )]
    field: Cell<i32>,
}

#[test]
fn get() {
    let mut buffer = [0u8; 32];
    let config = Config {
        field: __ConfigField::new(Cell::new(42)),
    };
    let len = config.get_json("/field", &mut buffer).unwrap();
    assert_eq!(from_utf8(&buffer[..len]), Ok("42"));
}

#[test]
fn set() {
    let mut config = Config {
        field: __ConfigField::new(Cell::new(42)),
    };
    config.set_json("/field", b"-32").unwrap();
    assert_eq!(config.field.get(), -32);
    config
        .set_json("/field", b"256")
        .expect_err("result not checked");
    config
        .set_json("/field", b"-256")
        .expect_err("result not checked");
}