use super::logic::{eq, gt, gte, lt, lte, ne};
use super::math_basic::MAX_INT;
use super::{reg_binary, reg_none, reg_unary};

use crate::def_package;
use crate::fn_register::{map_dynamic as map, map_result as result};
use crate::parser::INT;
use crate::result::EvalAltResult;
use crate::token::Position;

#[cfg(not(feature = "no_std"))]
use crate::stdlib::time::Instant;

#[cfg(not(feature = "no_std"))]
def_package!(crate:BasicTimePackage:"Basic timing utilities.", lib, {
    // Register date/time functions
    reg_none(lib, "timestamp", || Instant::now(), map);

    reg_binary(
        lib,
        "-",
        |ts1: Instant, ts2: Instant| {
            if ts2 > ts1 {
                #[cfg(not(feature = "no_float"))]
                return Ok(-(ts2 - ts1).as_secs_f64());

                #[cfg(feature = "no_float")]
                {
                    let seconds = (ts2 - ts1).as_secs();

                    #[cfg(not(feature = "unchecked"))]
                    {
                        if seconds > (MAX_INT as u64) {
                            return Err(Box::new(EvalAltResult::ErrorArithmetic(
                                format!(
                                    "Integer overflow for timestamp duration: {}",
                                    -(seconds as i64)
                                ),
                                Position::none(),
                            )));
                        }
                    }
                    return Ok(-(seconds as INT));
                }
            } else {
                #[cfg(not(feature = "no_float"))]
                return Ok((ts1 - ts2).as_secs_f64());

                #[cfg(feature = "no_float")]
                {
                    let seconds = (ts1 - ts2).as_secs();

                    #[cfg(not(feature = "unchecked"))]
                    {
                        if seconds > (MAX_INT as u64) {
                            return Err(Box::new(EvalAltResult::ErrorArithmetic(
                                format!("Integer overflow for timestamp duration: {}", seconds),
                                Position::none(),
                            )));
                        }
                    }
                    return Ok(seconds as INT);
                }
            }
        },
        result,
    );

    reg_binary(lib, "<", lt::<Instant>, map);
    reg_binary(lib, "<=", lte::<Instant>, map);
    reg_binary(lib, ">", gt::<Instant>, map);
    reg_binary(lib, ">=", gte::<Instant>, map);
    reg_binary(lib, "==", eq::<Instant>, map);
    reg_binary(lib, "!=", ne::<Instant>, map);

    reg_unary(
        lib,
        "elapsed",
        |timestamp: Instant| {
            #[cfg(not(feature = "no_float"))]
            return Ok(timestamp.elapsed().as_secs_f64());

            #[cfg(feature = "no_float")]
            {
                let seconds = timestamp.elapsed().as_secs();

                #[cfg(not(feature = "unchecked"))]
                {
                    if seconds > (MAX_INT as u64) {
                        return Err(EvalAltResult::ErrorArithmetic(
                            format!("Integer overflow for timestamp.elapsed(): {}", seconds),
                            Position::none(),
                        ));
                    }
                }
                return Ok(seconds as INT);
            }
        },
        result,
    );
});