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use clap::Parser;

struct Circle {
    radius: f64,
}

impl Circle {
    fn get_area(&self) -> f64 {
        let pi = std::f64::consts::PI;

        return &self.radius * pi.powi(2);
    }
}

pub fn circle_action(area: bool, radius: f64) {
    let circle = Circle { radius };

    if area {
        println!("{}cm", circle.get_area());
    }
}

#[derive(Parser)]
#[command(about="Mathematical operations with circles", long_about = None)]
pub struct Command {
    #[arg(short, long, help = "Sets the radius of the circle | e.g. -r 5")]
    pub radius: f64,

    #[arg(short, long, help = "Get the Area of the circle")]
    pub area: bool,
}

#[cfg(test)]
mod test {
    #[test]
    fn get_area() {
        let circle = super::Circle { radius: 42.0 };

        assert_eq!(circle.get_area(), 414.523384845753);
    }
}