use crate::config::*;

// This is a silly amount of work to genericise the below...
pub trait ToMyString {
    const BLANK_STRING: &'static str;
    fn to_my_string(&self) -> String;
}

impl ToMyString for char {
    const BLANK_STRING: &'static str = " ";
    fn to_my_string(&self) -> String {
        self.to_string()
    }
}

impl ToMyString for u32 {
    const BLANK_STRING: &'static str = "     ";
    fn to_my_string(&self) -> String {
        format!("{:5}", *self)
    }
}

impl ToMyString for f32 {
    const BLANK_STRING: &'static str = "    ";
    fn to_my_string(&self) -> String {
        format!("{:>4.1}", *self)
    }
}

pub fn format_block_output<T: Iterator<Item = S>, S: ToMyString>(things: T) -> String {
    let mut result = String::new();
    for (i, t) in things.enumerate() {
        result += &t.to_my_string();
        if i < NUM_KEYS - 1 {
            result.push(' ');
        }
        if (i + 1) % 10 == 0 {
            result.push('\n');
            if NUM_KEYS < 30 && i == 19 {
                result += S::BLANK_STRING;
                result.push(' ')
            }
        } else if (i < 20 && (i + 1) % 5 == 0) || (i == (NUM_KEYS - 20) / 2 + 19) {
            result.push(' ');
        }
        if i + 1 >= NUM_KEYS {
            break;
        }
    }
    return result;
}