use libm::{log, logf};
use crate::quantity::{Kelvins, Ohms};

/// Convert thermistor resistance to a temperature using beta parameter equation
pub fn convert_beta(
    resistance: Ohms<f32>,
    beta: f32,
    reference_temp: Kelvins<f32>,
    reference_resist: Ohms<f32>,
) -> Kelvins<f32> {
    let kelvins = 1.0 / ((1.0 / reference_temp.0) + (1.0 / beta) * logf(resistance.0 / reference_resist.0));
    Kelvins(kelvins)
}

/// Convert thermistor resistance to a temperature using Steinhart-Hart equation
pub fn convert_steinhart(
    resistance: Ohms<f64>,
    a: f64,
    b: f64,
    c: f64,
) -> Kelvins<f32> {
    let log_omhs = log(resistance.0);
    let kelvins = 1.0 / (a + b * log_omhs + c * log_omhs * log_omhs * log_omhs);
    Kelvins(kelvins as f32)
}