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#![allow(non_upper_case_globals)]

//! Recognized SI units

use crate::SI;

/// Pi as a fraction
///
/// Its value is the smallest continued fraction where converting to f64s and dividing produces a value exactly equal to f64::consts::PI
pub const PI: (i128, u128) = (245850922, 78256779);

/// A dimensionless value
#[doc(alias = "1")]
pub const DIMENSIONLESS: SI = SI {
    scale: (1, 1),
    s: (0, 1),
    m: (0, 1),
    kg: (0, 1),
    A: (0, 1),
    K: (0, 1),
    mol: (0, 1),
    cd: (0, 1),
};

// Base units

/// Second (s)
#[doc(alias = "s")]
pub const second: SI = SI {
    scale: (1, 1),
    s: (1, 1),
    m: (0, 1),
    kg: (0, 1),
    A: (0, 1),
    K: (0, 1),
    mol: (0, 1),
    cd: (0, 1),
};
/// Meter (m)
#[doc(alias = "m")]
pub const meter: SI = SI {
    scale: (1, 1),
    s: (0, 1),
    m: (1, 1),
    kg: (0, 1),
    A: (0, 1),
    K: (0, 1),
    mol: (0, 1),
    cd: (0, 1),
};
/// Kilogram (kg)
#[doc(alias = "kg")]
pub const kilogram: SI = SI {
    scale: (1, 1),
    s: (0, 1),
    m: (0, 1),
    kg: (1, 1),
    A: (0, 1),
    K: (0, 1),
    mol: (0, 1),
    cd: (0, 1),
};
/// Ampere (A)
#[doc(alias = "A")]
pub const ampere: SI = SI {
    scale: (1, 1),
    s: (0, 1),
    m: (0, 1),
    kg: (0, 1),
    A: (1, 1),
    K: (0, 1),
    mol: (0, 1),
    cd: (0, 1),
};
/// Kelvin (K)
#[doc(alias = "K")]
pub const kelvin: SI = SI {
    scale: (1, 1),
    s: (0, 1),
    m: (0, 1),
    kg: (0, 1),
    A: (0, 1),
    K: (1, 1),
    mol: (0, 1),
    cd: (0, 1),
};
/// Mole (mol)
#[doc(alias = "mol")]
pub const mole: SI = SI {
    scale: (1, 1),
    s: (0, 1),
    m: (0, 1),
    kg: (0, 1),
    A: (0, 1),
    K: (0, 1),
    mol: (1, 1),
    cd: (0, 1),
};
/// Candela (cd)
#[doc(alias = "cd")]
pub const candela: SI = SI {
    scale: (1, 1),
    s: (0, 1),
    m: (0, 1),
    kg: (0, 1),
    A: (0, 1),
    K: (0, 1),
    mol: (0, 1),
    cd: (1, 1),
};

// Named derived units

/// Radian (rad) (effectively an alias for `DIMENSIONLESS`)
#[doc(alias = "rad")]
pub const radian: SI = meter.div(meter);
/// Steradian (sr) (effectively an alias for `DIMENSIONLESS`)
#[doc(alias = "sr")]
pub const steradian: SI = meter.powi(2).div(meter.powi(2));
/// Hertz (Hz)
#[doc(alias = "Hz")]
pub const hertz: SI = second.powi(-1);
/// Newton (N)
#[doc(alias = "N")]
pub const newton: SI = kilogram.mul(meter).div(second.powi(2));
/// Pascal (Pa)
#[doc(alias = "Pa")]
pub const pascal: SI = kilogram.div(meter).div(second.powi(2));
/// Joule (J)
#[doc(alias = "J")]
pub const joule: SI = newton.mul(meter);
/// Watt (W)
#[doc(alias = "W")]
pub const watt: SI = joule.div(second);
/// Coulomb (C)
#[doc(alias = "C")]
pub const coulomb: SI = second.mul(ampere);
/// Volt (V)
#[doc(alias = "V")]
pub const volt: SI = watt.div(ampere);
/// Farad (F)
#[doc(alias = "F")]
pub const farad: SI = coulomb.div(volt);
/// Ohm (Ω)
#[doc(alias = "omega")]
#[doc(alias = "Ω")]
pub const ohm: SI = volt.div(ampere);
/// Siemens (S)
#[doc(alias = "S")]
pub const siemens: SI = ohm.powi(-1);
/// Weber (Wb)
#[doc(alias = "Wb")]
pub const weber: SI = volt.mul(second);
/// Tesla (T)
#[doc(alias = "T")]
pub const tesla: SI = weber.div(meter.powi(2));
/// Henry (H)
#[doc(alias = "H")]
pub const henry: SI = weber.div(ampere);
/// Lumen (lm) (effectively an alias for `candela`)
#[doc(alias = "lm")]
pub const lumen: SI = candela.mul(steradian);
/// Lux (lx)
#[doc(alias = "lx")]
pub const lux: SI = candela.mul(steradian).div(meter.powi(2));
/// Bequerel (Bq) (alias for `hertz`)
#[doc(alias = "Bq")]
pub const bequerel: SI = hertz;
/// Gray (Gy)
#[doc(alias = "Gy")]
pub const gray: SI = joule.div(kilogram);
/// Sievert (Sv) (alias for `gray`)
#[doc(alias = "Sv")]
pub const sievert: SI = gray;
/// Katal (kat)
#[doc(alias = "kat")]
pub const katal: SI = mole.div(second);

/// Percent (%)
#[doc(alias = "%")]
pub const percent: SI = DIMENSIONLESS.scale_by((1, 100));
/// Degree (°)
#[doc(alias = "°")]
pub const degree: SI = DIMENSIONLESS.scale_by(PI).scale_by((1, 180));
/// Arcminute (′)
#[doc(alias = "′")]
pub const arcminute: SI = degree.scale_by((1, 60));
/// Arcsecond (″)
#[doc(alias = "″")]
pub const arcsecond: SI = arcminute.scale_by((1, 60));
/// Minute (min)
#[doc(alias = "min")]
pub const minute: SI = second.scale_by((60, 1));
/// Hour (h)
#[doc(alias = "h")]
pub const hour: SI = meter.scale_by((60, 1));
/// Day (d)
#[doc(alias = "d")]
pub const day: SI = hour.scale_by((24, 1));

/// Astronomical Unit (au)
pub const au: SI = meter.scale_by((149597870700, 1)); // I think using the `au` abbreviation is okay since `astronomical_unit` would be so long and usually people pronounce "a-u" when speaking
/// Hectare (ha)
#[doc(alias = "ha")]
pub const hectare: SI = meter.powi(2).scale_by((10000, 1));

/// Liter (l, L)
#[doc(alias = "l")]
pub const liter: SI = meter.powi(3).scale_by((1, 1000));

/// Metric ton (t)
#[doc(alias = "t")]
pub const ton: SI = kilogram.scale_by((1000, 1));
/// Dalton (Da)
#[doc(alias = "Da")]
pub const dalton: SI = kilogram.scale_by((1_660_539_040, 10_u128.pow(27 + 9)));

/// Electronvolt (eV)
#[doc(alias = "eV")]
pub const electronvolt: SI = joule.scale_by((1_602_176_634, 10_u128.pow(19 + 9)));