use std::path::Path;
use std::fs::File;
use std::io::{BufRead, BufReader};
use fqdn::FQDN;

fn main() {

    // Create a path to the desired file
    let path = Path::new("/Users/xophe/Logiciels/TESS/Antidote/mudkeys");

    // Open the path in read-only mode, returns `io::Result<File>`
    // Open the path in read-only mode, returns `io::Result<File>`
    let file = File::open(&path).unwrap();
    let reader = BufReader::new(file);

    let mut letter = [0u32; 256];

    reader.lines()
        .map(|line| line.unwrap().parse::<FQDN>())
        .filter_map(|x| x.ok())
        .for_each(|f| {
            let c = f.as_bytes()[f.as_bytes().len()-2].to_ascii_lowercase();
            letter[c as usize] += 1
        });

    let mut freq = letter.iter().enumerate()
        .filter(|(_,c)| **c > 0)
        .collect::<Vec<_>>();
    freq.sort_by_key(|(_,c)| **c);

    freq.iter().rev().for_each(|(i,_)| print!("{} ", *i as u8 as char));

}

    /*

    s.as_bytes().iter()
        .for_each(|c| letter[c.to_ascii_lowercase() as usize] += 1);

    let mut freq = letter.iter()
        .enumerate()
        .map(|(c, n)| (c as u8 as char, *n))
        .filter(|(c, n)| *n > 0 && *c != '\n' && *c != ':')
        .collect::<Vec<_>>();

    freq.sort_by_key(|(_, n)| *n);

    let mut iter = freq.iter().map(|(c, _)| c).rev();

    let mut group = [[' '; 7]; 7];
    group.iter_mut().for_each(|a| a[0] = *iter.next().unwrap());

    group.iter_mut().rev()
        .try_for_each(|a|
            a.iter_mut()
                .skip(1)
                .try_for_each(|slot|
                    match iter.next() {
                        Some(c) => {
                            *slot = *c;
                            Ok(())
                        }
                        None => Err(())
                    }
                )
        );

    group.iter().for_each(|a| {
        a.iter().for_each(|c| print!("{}, ", c));
        println!();
    });

    let mut mapping = [(0u8,0u8);256];

    group.iter().enumerate().for_each(|(i, a)|
        a.iter().enumerate().filter(|(_,c)| **c != ' ').for_each(|(j, c)| {
            mapping[c.to_ascii_lowercase() as usize] = (i as u8,j as u8);
            mapping[c.to_ascii_uppercase() as usize] = (i as u8,j as u8);
        })
    );

    let mut iter = mapping.iter();
    /*
    pub(crate) const ALPHABET: [u8;256] = [
    0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,   //  16
    0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,   //  32
    0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0,37, 0, 0,   //  48 (-)
    27,28,29,30,31,32,33,34,    35,36, 0, 0, 0, 0, 0, 0,   //  64 (0-9)
    0, 1, 2, 3, 4, 5, 6, 7,     8, 9,10,11,12,13,14,15,   //  80 (A-O)
    16,17,18,19,20,21,22,23,    24,25,26, 0, 0, 0, 0,__,   //  96 (P-Z et _)
    0, 1, 2, 3, 4, 5, 6, 7,     8, 9,10,11,12,13,14,15,   // 112 (a-o)
    16,17,18,19,20,21,22,23,    24,25,26, 0, 0, 0, 0, 0,   // 128 (p-z)
    0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0
];*/
    (0..16).into_iter().for_each(|_| {
        print!("    ");
        (0..2).into_iter().for_each(|_| {
            (0..8).into_iter().for_each(|_| {
                let (i,j) = iter.next().unwrap();
                print!("({},{}), ", i, j );
            });
            print!("    ");
        });
        println!();
    });

}

/*
. -> 313880
o -> 227943
c -> 209144
u -> 146074
k -> 139188
m -> 117944
n -> 99949
i -> 95889
e -> 95533
a -> 93225
t -> 88272
d -> 86480
r -> 83421
s -> 81496
p -> 78078
g -> 74977
b -> 72425
l -> 70962
h -> 65631
f -> 64456
v -> 63131
y -> 62057
w -> 61868
x -> 59532
j -> 59206
q -> 56721
z -> 25748
- -> 9113
1 -> 7828
0 -> 7503
2 -> 7171
3 -> 6527
7 -> 5472
4 -> 5397
5 -> 5351
6 -> 4823
9 -> 4338
8 -> 4210
_ -> 91

Process finished with exit code 0

 */*/