use generate_quantity::quantity_type;
use crate::quantity::{Quantity, Value};

const VOLT_MV_RATIO: u16 = 1_000;

//----- Volts ----------------------------------
quantity_type! {Volts, "V"}

impl<V: Value> Volts<V> {
    #[inline]
    pub fn to_milli_volts(self) -> MilliVolts<V> {
        let multiplier = V::from_u16(VOLT_MV_RATIO).unwrap();
        MilliVolts(self.0 * multiplier)
    }
}

//----- Millivolts ----------------------------------
quantity_type! {MilliVolts, "mV"}

impl<V: Value> MilliVolts<V> {
    pub fn to_volts(self) -> Volts<V> {
        let divisor = V::from_u16(VOLT_MV_RATIO).unwrap();
        Volts(self.0 / divisor)
    }
}

// ---------------------------------------------------------------------------------------------------------------------
// ----- Tests ------------------------
// ---------------------------------------------------------------------------------------------------------------------
#[cfg(test)]
mod tests {
    use float_cmp::assert_approx_eq;
    use super::*;

    #[test]
    fn convert_u32() {
        let volts: Volts<u32> = 3.volts();
        let millivolts: MilliVolts<u32> = 3_000.milli_volts();

        assert_eq!(volts.to_milli_volts().0, millivolts.0);
        assert_eq!(millivolts.to_volts().0, volts.0);
    }

    #[test]
    fn convert_f64() {
        let volts: Volts<f64> = 3.0.volts();
        let millivolts: MilliVolts<f64> = 3_000.0.milli_volts();

        assert_approx_eq!(f64, volts.to_milli_volts().0, millivolts.0);
        assert_approx_eq!(f64, millivolts.to_volts().0, volts.0);
    }
}