cffdrs 0.11.0

Rust implementation of the Canadian Forest Fire Danger Rating System
Documentation 
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use std::f64::consts::E;

use crate::fbp_system::{ros::rate_of_spread, FbpFuelType};

/// Calculate back fire rate of spread (BROS)
///
/// * `ffmc` - Fine fuel moisture code
/// * `bui` - Buildup index
/// * `wsv` - Wind speed vector
/// * `fmc` - Foliar moisture content
/// * `sfc` - Surface fuel consumption
/// * `pc` - Percent confier
/// * `pdf` - Percent dead balsam fir
/// * `cc` - Degree of curing
/// * `cbh` - Crown base height
///
/// Returns back fire rate of spread (m/min)
#[allow(clippy::too_many_arguments)]
pub fn back_rate_of_spread(
    fuel_type: FbpFuelType,
    ffmc: f64,
    bui: f64,
    wsv: f64,
    fmc: f64,
    sfc: f64,
    pc: f64,
    pdf: f64,
    cc: f64,
    cbh: f64,
) -> f64 {
    let m = 147.27723 * (101. - ffmc) / (59.5 + ffmc);
    let ff = 91.9 * E.powf(-0.1386 * m) * (1. + m.powf(5.31) / 4.93e7);
    // Back fire wind function
    let bfw = E.powf(-0.05039 * wsv);
    // ISI associated with the back fire spread rate
    let bisi = 0.208 * bfw * ff;

    rate_of_spread(fuel_type, bisi, bui, fmc, sfc, pc, pdf, cc, cbh)
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::test_util::precision_f64;

    #[derive(Debug, serde::Deserialize)]
    struct TestRow {
        fuel_type: FbpFuelType,
        ffmc: f64,
        bui: f64,
        wsv: f64,
        fmc: f64,
        sfc: f64,
        pc: f64,
        pdf: f64,
        cc: f64,
        cbh: f64,
        bros: f64,
    }

    #[test]
    fn test_back_rate_of_spread() -> Result<(), Box<dyn std::error::Error>> {
        let fixture = std::fs::File::open("./tests/fixtures/back_rate_of_spread.csv")?;
        let mut rdr = csv::Reader::from_reader(fixture);

        for result in rdr.deserialize() {
            let record: TestRow = result?;
            let bros = back_rate_of_spread(
                record.fuel_type,
                record.ffmc,
                record.bui,
                record.wsv,
                record.fmc,
                record.sfc,
                record.pc,
                record.pdf,
                record.cc,
                record.cbh,
            );

            assert_eq!(precision_f64(bros, 4), record.bros);
        }

        Ok(())
    }
}