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use crate::define_macro::*;

// define and implement FixDec64.
define_fixdec!(FixDec64, i64, 18, 64, 63);

// convert FixDec64 into other FixDec types.
convert_try_into!(FixDec64, fixdec16, FixDec16);
convert_try_into!(FixDec64, fixdec32, FixDec32);
convert_into!(FixDec64, fixdec128, FixDec128);

// internal stuff needed by define_macro
const ALL_EXPS: [i64; 19] = [1,
    10_i64.pow(1), 10_i64.pow(2), 10_i64.pow(3), 10_i64.pow(4),
    10_i64.pow(5), 10_i64.pow(6), 10_i64.pow(7), 10_i64.pow(8),
    10_i64.pow(9), 10_i64.pow(10), 10_i64.pow(11), 10_i64.pow(12),
    10_i64.pow(13), 10_i64.pow(14), 10_i64.pow(15), 10_i64.pow(16),
    10_i64.pow(17), 10_i64.pow(18),
];

const fn calc_mul_div(a: i64, b: i64, c: i64, rounding: Rounding) -> Option<i64> {
    // try i64 first because I guess it's faster than i128
    if let Some(r) = a.checked_mul(b) {
        rounding_div_i64(r, c, rounding)
    } else {
        convert_opt_i128_to_i64(rounding_div_i128(a as i128 * b as i128, c as i128, rounding))
    }
}

const fn calc_div_div(a: i64, b: i64, c: i64, rounding: Rounding) -> Option<i64> {
    // try i64 first because I guess it's faster than i128
    if let Some(r) = b.checked_mul(c) {
        rounding_div_i64(a, r, rounding)
    } else {
        convert_opt_i128_to_i64(rounding_div_i128(a as i128, b as i128 * c as i128, rounding))
    }
}