use std::io;

fn main() {
    println!("Welcome to Pecha's Temperature Converter! 0u0!");
    loop {
        let mut scale = String::new();
        let mut temperature = String::new();

        let mut o_scale = String::new();
        println!("Please enter a scale to convert from- Farenheit (F) or Celsius (C)");
        io::stdin().read_line(&mut scale)
            .expect("ALERTA ALERTA ANTIFASCISTA");

        scale = scale.trim().to_string();
        if scale != "F" && scale != "C" {
            println!("No recognised scale, please try again");
            continue;
        }

        o_scale = o_scale.trim().to_string();
        if scale == "F" {o_scale = "C".to_string();}
        if scale == "C" {o_scale = "F".to_string();}

        println!("Please enter a temperature");
        io::stdin().read_line(&mut temperature)
            .expect("ALERTA ALERTA ANTIFASCISTA");
        let mut temperature: f32 = match temperature.trim().parse() {
            Ok(x)   => x,
            Err(_) => {
                println!("Error: not recognised as a number, please try again.");
                continue;
            } 
        };  
            
            // [°C] = ([°F] - 32) x 5/9
            //[°F] = [°C] x 9/5 + 32
        if scale == "F" {
            temperature = (temperature - 32.0)*5.0/9.0;
        } else {
            temperature = (temperature*9.0/5.0)+32.0;
        }
        println!("Your new temperature is {} degrees °{}",temperature,o_scale)
    }
}